阅读说明：本技术 一种结构涂层及其制备方法和应用 (Structural coating and preparation method and application thereof ) 是由 王鹏 乔丽 张弘 白小刚 于 2021-06-22 设计创作，主要内容包括：本发明涉及涂层电阻材料技术领域,尤其涉及一种结构涂层及其制备方法和应用。本发明提供的结构涂层,包括在基底表面依次层叠设置的钛过渡层和铂铪复合结构层；所述铂铪复合结构层的层数≥3；所述铂铪复合结构层包括依次层叠设置的铪层和铂层。本发明利用铪较高的熔点和较低的电阻率,通过在钛过渡层和铂层之间设置铪层,作为铂层的复合相,有效的提高了结构涂层在受热过程中的再结晶温度,抑制了高温下钛过渡层向金属电阻层(铂层)的扩散问题；通过设置所述铂铪复合结构层的层数≥3,增加了界面强化效应,最终得到一种具备高热稳定性的结构涂层。(The invention relates to the technical field of coating resistance materials, in particular to a structural coating and a preparation method and application thereof. The structural coating provided by the invention comprises a titanium transition layer and a platinum-hafnium composite structure layer which are sequentially stacked on the surface of a substrate; the number of layers of the platinum-hafnium composite structure layer is more than or equal to 3; the platinum-hafnium composite structure layer comprises a hafnium layer and a platinum layer which are sequentially stacked. According to the invention, by utilizing the higher melting point and the lower resistivity of hafnium, the hafnium layer is arranged between the titanium transition layer and the platinum layer and is used as a composite phase of the platinum layer, so that the recrystallization temperature of the structural coating in the heating process is effectively increased, and the problem of diffusion of the titanium transition layer to a metal resistance layer (platinum layer) at high temperature is inhibited; the number of layers of the platinum-hafnium composite structure layer is not less than 3, so that the interface strengthening effect is increased, and the structural coating with high thermal stability is finally obtained.)

1. A structural coating is characterized by comprising a titanium transition layer and a platinum-hafnium composite structural layer which are sequentially stacked on the surface of a substrate; the number of layers of the platinum-hafnium composite structure layer is more than or equal to 3;

the platinum-hafnium composite structure layer comprises a hafnium layer and a platinum layer which are sequentially stacked.

2. The structural coating of claim 1, wherein the structural coating has a total thickness of 900 to 2000 nm.

3. The structural coating of claim 1, wherein the titanium transition layer has a thickness of 140 to 300 nm.

4. The structural coating of any one of claims 1 to 3, wherein the ratio of the thickness of the platinum layer to the thickness of the hafnium layer is (20 to 22): (7-10).

5. A method of producing a structural coating as claimed in any one of claims 1 to 4, comprising the steps of:

sequentially preparing a titanium transition layer and a platinum-hafnium composite structure layer on the surface of a substrate to obtain the structural coating;

the process for preparing the platinum-hafnium composite structure layer is to cyclically and repeatedly deposit a hafnium layer and a platinum layer on the surface of the titanium transition layer in sequence, wherein the number of cyclic repetition is more than or equal to 3.

6. The method of claim 5, wherein the titanium transition layer is deposited under conditions of: the flow rate of the argon gas is 39-41 sccm; the working pressure of the argon plasma is 6.0-8.0 x 10^-1Pa; the temperature is 120-160 ℃; the time is 14-16 min; the power of the Ti target is 220-250W.

7. The method of claim 5, wherein the conditions for depositing the layer of hafnium are: the flow rate of the argon gas is 39-41 sccm; the working pressure of the argon plasma is (6.0-8.0) x 10^-1Pa; the temperature is 120-160 ℃; the time is 4.5-5.5 min; the hafnium target power is 180-185W.

8. The method of claim 5, wherein the conditions for depositing the platinum layer are: the flow rate of the argon gas is 39-41 sccm; the working pressure of the argon plasma is (6.0-8.0) x 10^-1Pa; the temperature is 120-160 ℃; the time is 7-8 min; the power of the platinum target is 180-185W.

9. Use of a structural coating according to any one of claims 1 to 4 or a structural coating produced by a method according to any one of claims 5 to 8 in an electrical heating element.

Technical Field

The invention relates to the technical field of coating resistance materials, in particular to a structural coating and a preparation method and application thereof.

Background

Electric heating elements have been used in a variety of applications as heating sources for micro-electrical systems, micro-analog reactors, thermal cutting devices, and the like. The resistor is generally made of a metal coating material and is realized through the forms of resistor heating and the like. Therefore, the resistivity of the coating is a key parameter influencing the performance of the device, and has an important relation with the preparation process, the size, the material and the like of the coating. Particularly, when the material structure reaches micro-nano level, the resistivity of the material is different from that of the material with the conventional size, so that the material is a basic content for researching the resistance material of the electric heating element and the coating characteristics of the resistance material.

The current commonly used coating resistance materials mainly comprise platinum, titanium, chromium, nickel-chromium alloy and the like. Based on the advantages of good high temperature resistivity stability, oxidation resistance and corrosion resistance, platinum metal has been used as a heat source for most coating resistors. However, pure platinum coatings have poor adhesion to semiconductor and dielectric substrates due to the inertness of the platinum metal itself, and therefore researchers often insert a titanium coating as an adhesion promoter between the platinum coating and the substrate. Although the introduction of titanium can improve the binding force of the coating, the formation of a protruding hillock structure of the platinum coating is caused due to the high affinity of titanium to oxygen and the wettability of titanium in the metal recrystallization process at high temperature, and then the protruding hillock structure of the coating is caused, so that the local discontinuity of the coating is caused, the performance of a platinum coating electric heating element, such as a temperature sensor or a heater, is degraded within the temperature range of 500-900 ℃, and finally the function failure of a micro device is caused.

Disclosure of Invention

The invention aims to provide a structural coating, a preparation method and application thereof, wherein the resistance of the structural coating has better high-temperature stability.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a structural coating, which comprises a titanium transition layer and a platinum-hafnium composite structure layer which are sequentially stacked on the surface of a substrate; the number of layers of the platinum-hafnium composite structure layer is more than or equal to 3;

the platinum-hafnium composite structure layer comprises a hafnium layer and a platinum layer which are sequentially stacked.

Preferably, the total thickness of the structural coating is 900-2000 nm.

Preferably, the thickness of the titanium transition layer is 140-300 nm.

Preferably, the thickness ratio of the platinum layer to the hafnium layer is (20-22): (7-10).

The invention also provides a preparation method of the structural coating, which comprises the following steps:

sequentially preparing a titanium transition layer and a platinum-hafnium composite structure layer on the surface of a substrate to obtain the structural coating;

the process for preparing the platinum-hafnium composite structure layer is to cyclically and repeatedly deposit a hafnium layer and a platinum layer on the surface of the titanium transition layer in sequence, wherein the number of cyclic repetition is more than or equal to 3.

Preferably, the conditions for depositing the titanium transition layer are as follows: the flow rate of the argon gas is 39-41 sccm; the working pressure of the argon plasma is 6.0-8.0 x 10^-1Pa; the temperature is 120-160 ℃; the time is 14-16 min; the power of the Ti target is 220-250W.

Preferably, the conditions for depositing the hafnium layer are: the flow rate of the argon gas is 39-41 sccm; the working pressure of the argon plasma is (6.0-8.0) x 10^-1Pa; the temperature is 120-160 ℃; the time is 4.5-5.5 min; the hafnium target power is 180-185W.

Preferably, the conditions for depositing the platinum layer are as follows: the flow rate of the argon gas is 39-41 sccm; the working pressure of the argon plasma is (6.0-8.0) x 10^-1Pa; the temperature is 120-160 ℃; the time is 7-8 min; the power of the platinum target is 180-185W.

The invention also provides the application of the structural coating in the technical scheme or the structural coating prepared by the preparation method in the technical scheme in an electric heating element.

The invention provides a structural coating, which comprises a titanium transition layer and a platinum-hafnium composite structure layer which are sequentially stacked on the surface of a substrate; the number of layers of the platinum-hafnium composite structure layer is more than or equal to 3; the platinum-hafnium composite structure layer comprises a hafnium layer and a platinum layer which are sequentially stacked. According to the invention, by utilizing the higher melting point and the lower resistivity of hafnium, the hafnium layer is arranged between the titanium transition layer and the platinum layer and is used as a composite phase of the platinum layer, so that the recrystallization temperature of the structural coating in the heating process is effectively increased, and the problem of diffusion of the titanium transition layer to a metal resistance layer (platinum layer) at high temperature is inhibited; by setting the number of the platinum-hafnium composite structure layers to be not less than 3, the interface strengthening effect is increased, the diffusion rate among different metals is reduced, the electrical stability of the platinum resistance layer is enhanced, and the structural coating with high thermal stability is finally obtained.

Drawings

FIG. 1 is a schematic cross-sectional view of a structural coating described in example 1;

FIG. 2 is a cross-sectional SEM image of a structural coating described in example 1;

FIG. 3 is a Rutherford backscattering spectrum of the structural coating described in example 1 after heat treatment;

FIG. 4 is a graph of resistivity after heat treatment for the structural coatings described in example 1 and comparative examples 1-3;

FIG. 5 is a schematic cross-sectional view of a structural coating described in comparative example 1;

FIG. 6 is a cross-sectional SEM image of a structural coating described in comparative example 1;

FIG. 7 is a Rutherford backscattering spectrum of the structured coating described in comparative example 1 after heat treatment;

FIG. 8 is a schematic cross-sectional view of a structural coating described in comparative example 2;

FIG. 9 is a cross-sectional SEM image of a structural coating described in comparative example 2;

FIG. 10 is a Rutherford backscattering profile of the structured coating of comparative example 2 after heat treatment;

FIG. 11 is a schematic cross-sectional view of a structural coating described in comparative example 3;

FIG. 12 is a cross-sectional SEM image of a structural coating described in comparative example 3;

fig. 13 is a rutherford backscattering spectrum of the structural coating described in comparative example 3 after heat treatment.

Detailed Description

The invention provides a structural coating, which comprises a titanium transition layer and a platinum-hafnium composite structure layer which are sequentially stacked on the surface of a substrate; the number of layers of the platinum-hafnium composite structure layer is more than or equal to 3;

the platinum-hafnium composite structure layer comprises a hafnium layer and a platinum layer which are sequentially stacked.

In the invention, the total thickness of the structural coating is preferably 900-2000 nm, more preferably 1000-1800 nm, and most preferably 1300-1600 nm.

In the invention, when the thickness of the structural coating is more than 2000nm, the coating is too thick, so that the adhesion between the coating and the substrate is weakened, and the mechanical property of the coating is reduced; when the thickness of the structural coating is less than 900nm, the conductive effect of the coating is weakened, so that the practicability of components based on the structural coating is reduced, and even the failure of resistance components is caused.

The material of the substrate is not particularly limited in the present invention, and materials well known to those skilled in the art may be used. In an embodiment of the invention, the substrate is a silicon nitride substrate.

In the present invention, the structural coating comprises a titanium transition layer; the thickness of the titanium transition layer is preferably 140-300 nm, more preferably 180-260 nm, and most preferably 200-230 nm.

In the invention, the titanium transition layer has the function of increasing the bonding force between the platinum resistance layer and the base material, and the function of controlling the thickness of the titanium transition layer within the range is to weaken the influence of the transition layer on the electrical characteristics of the resistance layer as much as possible while enhancing the bonding force between the coating and the base material.

In the invention, the number of layers of the platinum-hafnium composite structure layer is not less than 3, and preferably 3-6.

In the invention, the thickness of a single layer is reduced due to the excessive number of the platinum-hafnium composite structure layers, the blocking effect of thermal diffusion of hafnium elements is not obvious, and further, the diffusion of a large number of titanium transition layers to a platinum resistance layer is reserved, so that the application of a structural coating in a resistance component is influenced; the number of layers is too small, the multilayer interface effect is not obvious, and further, the diffusion between different metals among layers is reserved, and the high thermal stability and the practical applicability of the resistance coating are influenced.

In the present invention, the platinum-hafnium composite structure layer preferably includes a hafnium layer and a platinum layer, which are sequentially stacked. In the present invention, the ratio of the thickness of the platinum layer to the thickness of the hafnium layer is preferably (20 to 22): (7-10), more preferably (20.5-21.5): (8-9).

In the invention, when the thickness ratio of the platinum layer to the hafnium layer is too large, the barrier effect of the hafnium layer is not obvious, and further, the diffusion of a large amount of titanium transition layers to the platinum resistance layer is reserved, so that the application of the structural coating in a resistance component is influenced; when the thickness ratio of the platinum layer to the hafnium layer is too small, the effect of the platinum layer conductive layer is weakened, and the practicability of the component based on the structural coating is reduced, even the failure of the resistance component is caused.

The invention also provides a preparation method of the structural coating, which comprises the following steps:

sequentially preparing a titanium transition layer and a platinum-hafnium composite structure layer on the surface of a substrate to obtain the structural coating;

the process for preparing the platinum-hafnium composite structure layer is to cyclically and repeatedly deposit a hafnium layer and a platinum layer on the surface of the titanium transition layer in sequence, wherein the number of cyclic repetition is more than or equal to 3.

In the present invention, all the starting materials for the preparation are commercially available products known to those skilled in the art unless otherwise specified.

The present invention is not limited to any particular kind of material for the substrate, and may be carried out using materials well known to those skilled in the art. In an embodiment of the invention, the substrate is a silicon nitride substrate.

In the present invention, the manner of preparing the titanium transition layer is preferably deposition; before deposition, the present invention also preferably includes pre-treating the substrate; the pretreatment preferably comprises the steps of etching the surface of the substrate by using argon plasma for 5-15 min, and removing a natural oxidation and impurity pollution layer on the surface of the substrate by using bias voltage of-500-600V.

In the invention, the deposition mode is preferably magnetron sputtering physical vapor deposition, electron beam evaporation coating or chemical vapor deposition, and more preferably magnetron sputtering physical vapor deposition.

When the deposition mode is magnetron sputtering physical vapor deposition, the purity of a titanium target used for depositing the titanium transition layer is preferably 99.995%, and the diameter of the titanium target is preferably 75 mm. In the present invention, the conditions for depositing the titanium transition layer are preferably: the flow rate of the argon gas is preferably 39-41 sccm, and more preferably 40 sccm; the working pressure of the argon plasma is preferably (6.0-8.0) × 10^-1Pa, more preferably (6.5 to 7.5). times.10^-1Pa, most preferably (6.8 to 7.3). times.10^-1Pa; the temperature is preferably 120-160 ℃, more preferably 130-150 ℃, and most preferably 135-145 ℃; the time is preferably 14-16 min, more preferably 15min, and most preferably 18-22 min; the power of the Ti target is preferably 220-250W, more preferably 225-245W, and most preferably 230-240W.

When the deposition is magnetron sputtering physical vapor deposition, the hafnium layer is deposited with a purity of preferably 99.99% with a hafnium target having a diameter of preferably 75 mm. In the present invention, the conditions for depositing said hafnium layer are preferably: the flow rate of the argon gas is preferably 39-41 sccm, and more preferably 40 sccm; the working pressure of the argon plasma is preferably (6.0-8.0) × 10^-1Pa, more preferably (6.5 to 7.5). times.10^-1Pa, most preferably (6.8 to 7.3). times.10^-1Pa; the temperature is preferably 120-160 ℃, more preferably 130-150 ℃, and most preferably 135-145 ℃; the time is preferably 4.5-5.5 min, and more preferably 4.8-5.2 min; the hafnium target power is preferably 180-185W, more preferably 181-184W, and most preferably 182-183W.

When the deposition mode is magnetron sputtering physical vapor deposition, the purity of a platinum target used for depositing the platinum layer is preferably 99.999%, and the diameter of the platinum target is preferably 75 mm. In the present invention, the conditions for depositing the platinum layer are preferably: the flow rate of the argon gas is preferably 39-41 sccm, and more preferably 40 sccm; the working pressure of the argon plasma is excellentSelected as (6.0-8.0) × 10^-1Pa, more preferably (6.5 to 7.5). times.10^-1Pa, most preferably (6.8 to 7.3). times.10^-1Pa; the temperature is preferably 120-160 ℃, and more preferably 130-150 ℃; the time is preferably 4.5-5.5 min, and more preferably 5 min; the power of the platinum target is preferably 180-185W, and more preferably 182-183W.

In the present invention, the above deposition process is preferably performed in a commercial magnetron sputtering apparatus, which preferably comprises 3 independently controllable magnetron target sputtering sources; and respectively installing a titanium target, a platinum target and a hafnium target in the 3 independently controllable magnetron target sputtering sources.

The invention also provides the application of the structural coating in the technical scheme or the structural coating prepared by the preparation method in the technical scheme in an electric heating element. The method of the present invention is not particularly limited, and the method may be performed by a method known to those skilled in the art.

The structural coating provided by the present invention, and the method of making and using the same, are described in detail below with reference to the examples, which should not be construed as limiting the scope of the invention.

Example 1

Respectively installing a titanium target with the purity of 99.995% and the diameter of 75mm, a platinum target with the purity of 99.99% and the diameter of 75mm and a hafnium target with the purity of 99.99% and the diameter of 75mm on 3 independently controllable magnetron sputtering sources on a commercial magnetron sputtering device;

pretreating the surface of the silicon nitride substrate: etching the silicon nitride substrate by using argon plasma with bias voltage of-500V for 15 min;

depositing a titanium transition layer on the surface of the pretreated substrate: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, the deposition temperature is 150 ℃, the titanium target power is 235W, and the deposition time is 15min to obtain a titanium transition layer (140 nm);

depositing a hafnium layer on the surface of the titanium transition layer: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, deposition temperature of 150 ℃, hafnium target power of 185W, deposition time of 5min,obtaining a first hafnium layer (70 nm);

depositing a platinum layer on the surface of the hafnium layer: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^{- 1}Pa, the deposition temperature is 150 ℃, the platinum target power is 185W, and the deposition time is 7.5min, so as to obtain a first platinum layer (210 nm);

sequentially depositing a second hafnium layer (70nm), a second platinum layer (210nm), a third hafnium layer (70nm) and a third platinum layer (210nm) on the surface of the first platinum layer according to the conditions for depositing the first hafnium layer and the first platinum layer, and obtaining the structural coating (recorded as Ti/Hf/Pt/Hf/Pt/Hf/Pt, the total thickness is 980 nm);

FIG. 1 is a schematic cross-sectional view of the structural coating, as can be seen in FIG. 1, including a titanium transition layer, a first hafnium layer, a first platinum layer, a second hafnium layer, a second platinum layer, a third hafnium layer, and a third platinum layer disposed in that order on a surface of a substrate;

fig. 2 is a cross-sectional SEM image of the structural coating, as can be seen from fig. 2, where the interfaces of the layers in the structural coating are visible by the detection means.

Heating the coating sample by a high vacuum thermal annealing furnace to 500, 600, 700, 800, 900 and 1000 ℃ respectively, and keeping the temperature at the highest heating temperature for 30min by using 3MeV energy He⁴⁺Coating Rutherford Backscattering Spectroscopy (RBS) before and after ion analysis heating; the test results are shown in fig. 3, and the peaks of the hafnium layer and the platinum layer of each layer do not change obviously with the peak of titanium when the ceramic is heated to 500 ℃; heating to 800 ℃, the disappearance of the structure shows that the interface between the hafnium layer and the platinum layer diffuses, but the titanium peak still has no obvious change; the structure coating is heated to 1000 ℃, and the pattern of the structure coating has no obvious difference with that at 800 ℃, which shows that the structure inhibits the titanium from diffusing to the platinum layer;

testing the resistivity of the coating material by adopting a four-probe testing method on an RTS-9 double-electrical testing four-probe tester; the resistivity data is the average value of 3 tests, the test result is shown in FIG. 4, and it can be seen from FIG. 4 that the temperature is increased from room temperature to 500 ℃, and the resistivity is gradually increased from 6 mu omega cm to 8 mu omega cm; the resistivity of the film was increased to a maximum of about 54. mu. omega. cm at 700 ℃ by further increasing the heat treatment temperature, and the resistivity of the film was decreased to 31. mu. omega. cm by further increasing the heat treatment temperature.

Comparative example 1

Respectively installing a titanium target with the purity of 99.995% and the diameter of 75mm, a platinum target with the purity of 99.99% and the diameter of 75mm and a hafnium target with the purity of 99.99% and the diameter of 75mm on 3 independently controllable magnetron sputtering sources on a commercial magnetron sputtering device;

pretreating the surface of the silicon nitride substrate: etching the silicon nitride substrate by using argon plasma with bias voltage of-500V for 15 min;

depositing a titanium transition layer on the surface of the pretreated substrate: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, the deposition temperature is 150 ℃, the titanium target power is 235W, and the deposition time is 30min to obtain a titanium transition layer (280 nm);

depositing a platinum layer on the surface of the titanium transition layer: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, depositing at 150 ℃, keeping the platinum target power at 185W, and depositing for 20min to obtain a platinum layer (600nm) and a structural coating (marked as Ti/Pt);

FIG. 5 is a schematic cross-sectional view of the structural coating, as can be seen from FIG. 5, including a titanium transition layer and a platinum layer sequentially disposed on a surface of a substrate;

fig. 6 is a cross-sectional SEM image of the structural coating, and as can be seen from fig. 6, the interfaces of the layers in the structural coating are clear.

Heating the coating sample by a high vacuum thermal annealing furnace to 500, 600, 700, 800, 900 and 1000 ℃ respectively, and keeping the temperature at the highest heating temperature for 30min by using 3MeV energy He⁴⁺Coating Rutherford Backscattering Spectroscopy (RBS) before and after ion analysis heating; the test results are shown in fig. 7, after heating to above 700 ℃, the backscattering peak of platinum and titanium changes significantly, and titanium diffuses into the platinum layer;

testing the resistivity of the coating material by adopting a four-probe testing method on an RTS-9 double-electrical testing four-probe tester; the resistivity data is an average value of 3 tests, the test result is shown in fig. 4, and as can be seen from fig. 4, the resistivity at room temperature is 20 μ Ω · cm, the resistivity does not increase significantly when the film is heated to 500 ℃, the resistivity increases to 89 μ Ω · cm when the film is heated to 700 ℃, the heat treatment temperature is further increased to 800 ℃, the resistivity increases to 143 μ Ω · cm, the temperature is further increased to 900 ℃, and the resistivity continues to increase.

Comparative example 2

Respectively installing a titanium target with the purity of 99.995% and the diameter of 75mm, a platinum target with the purity of 99.99% and the diameter of 75mm and a hafnium target with the purity of 99.99% and the diameter of 75mm on 3 independently controllable magnetron sputtering sources on a commercial magnetron sputtering device;

pretreating the surface of the silicon nitride substrate: etching the silicon nitride substrate by using argon plasma with bias voltage of-500V for 15min to remove a natural oxide layer and an impurity pollution layer on the surface of the substrate;

depositing a titanium transition layer on the surface of the pretreated substrate: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, the deposition temperature is 150 ℃, the titanium target power is 235W, and the deposition time is 15min to obtain a titanium transition layer (140 nm);

depositing a hafnium layer on the surface of the titanium transition layer: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, deposition temperature 150 deg.C, hafnium target power 155W, deposition time 20min, resulting in a hafnium layer (200 nm);

depositing a platinum layer on the surface of the hafnium layer: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^{- 1}Pa, the deposition temperature is 150 ℃, the platinum target power is 185W, the deposition time is 10min, a platinum layer (280nm) is obtained, and then a structural coating (recorded as Ti/Hf/Pt, the total thickness is 620nm) is obtained;

FIG. 8 is a schematic cross-sectional view of the structural coating, as seen in FIG. 8, including a titanium transition layer, a hafnium layer, and a platinum layer sequentially disposed on a surface of a substrate;

fig. 9 is a cross-sectional SEM image of the structural coating, and as can be seen from fig. 9, the interfaces of the layers in the structural coating are clear.

Heating the coating sample by a high vacuum thermal annealing furnace to 500, 600, 700, 800, 900 and 1000 ℃ respectively, and keeping the temperature at the highest heating temperature for 30min by using 3MeV energy He⁴⁺Before heating for ion analysisPost-coating Rutherford Backscattering Spectroscopy (RBS); the test results are shown in fig. 10, and after heating to 700 ℃ or higher, the back scattering peaks of hafnium/platinum and titanium are significantly changed, and the diffusion of titanium to the Hf/Pt layer occurs;

testing the resistivity of the coating material by adopting a four-probe testing method on an RTS-9 double-electrical testing four-probe tester; the resistivity data is the average value of 3 tests, the test result is shown in FIG. 4, and it can be seen from FIG. 4 that the resistivity is increased from room temperature to 500 ℃ and gradually increased from 15 μ Ω · cm to 17 μ Ω · cm; heating to 700 ℃ increases the resistivity to 130. mu. omega. cm, and further increases the temperature, decreases the resistivity to 90. mu. omega. cm, and remains substantially constant.

Comparative example 3

Respectively installing a titanium target with the purity of 99.995% and the diameter of 75mm, a platinum target with the purity of 99.99% and the diameter of 75mm and a hafnium target with the purity of 99.99% and the diameter of 75mm on 3 independently controllable magnetron sputtering sources on a commercial magnetron sputtering device;

pretreating the surface of the silicon nitride substrate: etching the silicon nitride substrate by using argon plasma with bias voltage of-500V for 15 min;

depositing a titanium transition layer on the surface of the pretreated substrate: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, the deposition temperature is 150 ℃, the titanium target power is 235W, and the deposition time is 15min to obtain a titanium transition layer (140 nm);

depositing a hafnium-platinum composite layer on the surface of the titanium transition layer: the argon flow is 40sccm, and the argon plasma working pressure is 6.5 × 10^-1Pa, deposition temperature of 150 ℃, deposition time of 15min, hafnium target power of 185W and platinum target power of 50W to obtain a hafnium-platinum composite layer (650nm) and further obtain a structural coating (recorded as Ti/Hf-Pt, total thickness of 790 m);

FIG. 11 is a schematic cross-sectional view of the structural coating, as can be seen from FIG. 11, the structural coating includes a titanium transition layer and a hafnium-platinum composite layer sequentially disposed on a surface of a substrate;

fig. 12 is a cross-sectional SEM image of the structural coating, and as can be seen from fig. 12, the interfaces of the various layers in the structural coating are clear.

By using high vacuum thermal annealing furnace pairHeating the coating sample to 500 deg.C, 600 deg.C, 700 deg.C, 800 deg.C, 900 deg.C and 1000 deg.C respectively, and maintaining the temperature at the highest heating temperature for 30min by using 3MeV energy He⁴⁺Coating Rutherford Backscattering Spectroscopy (RBS) before and after ion analysis heating; the test results are shown in fig. 13, and after heating to 800 ℃ or higher, the back scattering peaks of hafnium-platinum and titanium are obviously changed, and the titanium diffuses into the Hf-Pt layer;

testing the resistivity of the coating material by adopting a four-probe testing method on an RTS-9 double-electrical testing four-probe tester; the resistivity data is the average value of 3 tests, the test result is shown in FIG. 4, and it can be seen from FIG. 4 that the resistivity is increased from room temperature to 500 ℃ and gradually increased from 26 μ Ω · cm to 30 μ Ω · cm; heating to 800 ℃ increased the resistivity to 138. mu. omega. cm, and further increased the resistivity to 84. mu. omega. cm, which remained substantially constant.

It can be seen that the structural coating of the present invention has a higher thermal stability.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.