阅读说明：本技术 一种合金粉末及其制备方法和应用以及应用方法 (Alloy powder, and preparation method, application and application method thereof ) 是由 方钊 于 2021-08-19 设计创作，主要内容包括：本发明属于合金金属技术领域。本发明提供了一种合金粉末,包含5～10％的Ni,1～2％的Nb,0.05～0.08％的Hf,0.01～0.04％的Ta,余量为Al。本发明通过特定比例的金属配合,制备得到了合金粉末,利用超音速喷涂技术对金属表面进行涂覆,不仅节省了成本,而且涂层的耐磨和耐高温性得到提升,可以有效的保护辊面在轧碾过程中因压力和剪切力所受到的损伤,提高工作效率,延长工作时间。(The invention belongs to the technical field of alloy metal. The invention provides an alloy powder, which comprises 5-10% of Ni, 1-2% of Nb, 0.05-0.08% of Hf, 0.01-0.04% of Ta and the balance of Al. According to the invention, the alloy powder is prepared by matching metals in a specific proportion, and the supersonic spraying technology is utilized to coat the metal surface, so that the cost is saved, the wear resistance and the high temperature resistance of the coating are improved, the damage of the roll surface caused by pressure and shearing force in the rolling process can be effectively protected, the working efficiency is improved, and the working time is prolonged.)

1. An alloy powder, characterized by being prepared from the following components in parts by mass: ni: 5-10%, Nb: 1-2%, Hf: 0.05-0.08%, Ta: 0.01-0.04%, and the balance of Al.

2. The alloy powder according to claim 1, wherein the particle size of the alloy powder is 50 to 100 μm.

3. A method for producing the alloy powder according to claim 1 or 2, characterized by comprising the steps of: smelting the components to obtain an alloy ingot, and crushing to obtain the alloy powder.

4. The preparation method according to claim 3, wherein the degree of vacuum of the smelting is 0.003-0.004 Pa.

5. The production method according to claim 3 or 4, wherein the melting is a first melting, a second melting, and a third melting that are performed in sequence;

the current of the first smelting is 15-25A, and the time of the first smelting is 10-20 min;

the current of the second smelting is 40-45A, and the time of the second smelting is 15-25 min;

the current of the third smelting is 70-80A, and the time of the third smelting is 5-10 min.

6. Use of the alloy powder according to claim 1 or 2 for coating metal surfaces.

7. Method for applying an alloy powder according to claim 1 or 2, characterized in that it comprises the following steps: and (3) coating the alloy powder on the metal surface by adopting supersonic spraying.

8. The method of claim 7, wherein the supersonic spray is at a temperature of 150 to 200 ℃ and the air pressure of the supersonic spray is 0.4 to 0.5 MPa.

9. The application method of claim 7 or 8, wherein the powder feeding rate of the supersonic spraying is 40-50 g/min, the distance of the supersonic spraying is 18-20 cm, and the moving speed of a spray gun of the supersonic spraying is 1000-1500 mm/min.

10. The method of use according to claim 9, wherein the supersonic spray has a propane flow rate of 35 to 40L/min and the supersonic spray has an air flow rate of 200 to 300L/min.

Technical Field

The invention relates to the technical field of alloy metal, in particular to alloy powder, a preparation method, application and an application method thereof.

Background

The rolls are important parts of rolling mills in steel rolling mills, and roll steel by using pressure generated when a pair or a group of rolls roll. The rolls are tools for plastically deforming the metal and are important consumable parts for determining the efficiency of the rolling mill and the quality of the rolled material. The irregular depressions are formed on the surface of the roll along with the prolonging of the service time, and the depressions formed on the rolled material seriously affect the working efficiency and the service life of the roll. In order to improve the wear resistance of the surface of the roller, an electroplating method is mostly adopted at present, chromium is plated on the surface of the roller so as to protect the surface of the roller and prolong the working time. However, the process of electroplating chromium on the surface is not only costly but also produces industrial pollution. Therefore, a new method for protecting the roller is urgently needed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides alloy powder, and a preparation method, application and an application method thereof.

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

the invention provides alloy powder which is prepared from the following components in percentage by mass: ni: 5-10%, Nb: 1-2%, Hf: 0.05-0.08%, Ta: 0.01-0.04%, and the balance of Al.

Preferably, the particle size of the alloy powder is 50 to 100 μm.

The invention also provides a preparation method of the alloy powder, which comprises the following steps: smelting the components to obtain an alloy ingot, and crushing to obtain the alloy powder.

Preferably, the vacuum degree of the smelting is 0.003-0.004 Pa.

Preferably, the smelting is a first smelting, a second smelting and a third smelting which are sequentially carried out;

the current of the first smelting is 15-25A, and the time of the first smelting is 10-20 min;

the current of the second smelting is 40-45A, and the time of the second smelting is 15-25 min;

the current of the third smelting is 70-80A, and the time of the third smelting is 5-10 min.

The invention also provides application of the alloy powder in metal surface coating.

The invention also provides an application method of the alloy powder, which comprises the following steps: and (3) coating the alloy powder on the metal surface by adopting supersonic spraying.

Preferably, the temperature of the supersonic spraying is 150-200 ℃, and the air pressure of the supersonic spraying is 0.4-0.5 MPa.

Preferably, the powder feeding speed of the supersonic spraying is 40-50 g/min, the distance of the supersonic spraying is 18-20 cm, and the moving speed of a spray gun of the supersonic spraying is 1000-1500 mm/min.

Preferably, the flow rate of the propane sprayed at the supersonic speed is 35-40L/min, and the flow rate of the air sprayed at the supersonic speed is 200-300L/min.

The invention provides an alloy powder, which comprises 5-10% of Ni, 1-2% of Nb, 0.05-0.08% of Hf, 0.01-0.04% of Ta and the balance of Al. According to the invention, the alloy powder is prepared by matching metals in a specific proportion, and the supersonic spraying technology is utilized to coat the metal surface, so that the cost is saved, the wear resistance and the high temperature resistance of the coating are improved, the damage of the roll surface caused by pressure and shearing force in the rolling process can be effectively protected, the working efficiency is improved, and the working time is prolonged.

Detailed Description

The invention provides alloy powder which is prepared from the following components in percentage by mass: ni: 5-10%, Nb: 1-2%, Hf: 0.05-0.08%, Ta: 0.01-0.04%, and the balance of Al.

In the present invention, the mass fraction of Ni is 5 to 10%, preferably 6 to 9%, and more preferably 7 to 8%.

In the present invention, the mass fraction of Nb is 1 to 2%, preferably 1.2 to 1.8%, and more preferably 1.4 to 1.6%.

In the present invention, the addition of Ni and Nb, which have ductility, can prevent the coating from being damaged by stress concentration during rolling, but the addition of too much Ni and Nb results in a decrease in the hardness of the coating; if the amount is too small, the coating may be damaged. Therefore, the mass fraction of Ni is controlled to be 5-10%, and the mass fraction of Nb is controlled to be 1-2%.

In the invention, the mass fraction of Hf is 0.05-0.08%, preferably 0.06-0.07%, and more preferably 0.064-0.066%.

In the invention, the mass fraction of Ta is 0.01-0.04%, preferably 0.02-0.03%, and more preferably 0.024-0.026%.

In the invention, the addition of Hf and Ta can effectively improve the wear resistance of the coating, and the two metals are controlled in a proper range, so that the loss caused by over brittleness of the coating can be avoided.

In the present invention, the particle size of the alloy powder is preferably 50 to 100 μm, more preferably 60 to 90 μm, and still more preferably 70 to 80 μm.

The invention also provides a preparation method of the alloy powder, which comprises the following steps: smelting the components to obtain an alloy ingot, and crushing to obtain the alloy powder.

In the invention, the vacuum degree of the smelting is preferably 0.003-0.004 Pa, more preferably 0.0032-0.0038 Pa, and even more preferably 0.0034-0.0036 Pa.

In the present invention, the melting is preferably a first melting, a second melting, and a third melting performed in this order.

In the invention, the current of the first smelting is preferably 15-25A, more preferably 16-24A, and more preferably 18-22A; the first melting time is preferably 10-20 min, more preferably 12-18 min, and even more preferably 14-16 min.

In the invention, the current of the second smelting is preferably 40-45A, more preferably 41-44A, and even more preferably 42-43A; the second melting time is preferably 15-25 min, more preferably 16-24 min, and even more preferably 18-22 min.

In the invention, the current of the third smelting is preferably 70-80A, more preferably 72-78A, and even more preferably 74-76A; the time for the third smelting is preferably 5-10 min, more preferably 6-9 min, and even more preferably 7-8 min.

The invention also provides application of the alloy powder in metal surface coating.

The invention also provides an application method of the alloy powder, which comprises the following steps: and (3) coating the alloy powder on the metal surface by adopting supersonic spraying.

In the invention, the supersonic spraying temperature is preferably 150-200 ℃, more preferably 160-190 ℃, and more preferably 170-180 ℃; the air pressure of the supersonic spraying is preferably 0.4-0.5 MPa, more preferably 0.42-0.48 MPa, and even more preferably 0.44-0.46 MPa.

In the invention, the powder feeding rate of the supersonic spraying is preferably 40-50 g/min, more preferably 42-48 g/min, and more preferably 44-46 g/min; the supersonic spraying distance is preferably 18-20 cm, more preferably 18.4-19.6 cm, and even more preferably 18.8-19.2 cm; the moving speed of the supersonic spraying spray gun is preferably 1000-1500 mm/min, more preferably 1100-1400 mm/min, and even more preferably 1200-1300 mm/min.

In the invention, the flow rate of the propane sprayed at the supersonic speed is preferably 35-40L/min, more preferably 36-39L/min, and even more preferably 37-38L/min; the air flow rate of the supersonic spraying is preferably 200-300L/min, more preferably 220-280L/min, and even more preferably 240-260L/min.

The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.

Example 1

Weighing the following components in percentage by mass: 8% of Ni, 1.5% of Nb, 0.065% of Hf, 0.025% of Ta and 90.41% of Al.

Mixing the components, smelting at the vacuum degree of 0.0035Pa for 15min under the current of 20A to finish the first smelting; smelting for 20min under the current of 43A to finish the second smelting; smelting for 8min under the current of 75A to finish the third smelting; naturally cooling to room temperature after the smelting is finished to obtain an alloy ingot, and then crushing the alloy ingot to 75 microns to obtain alloy powder.

The alloy powder prepared in the embodiment is coated on the surface of metal by adopting a supersonic spraying mode, wherein the supersonic spraying temperature is 175 ℃, the air pressure is 0.45MPa, the powder feeding speed is 45g/min, the spraying distance is 19cm, the moving speed of a spray gun is 1250mm/min, the propane flow rate is 38L/min, and the air flow rate is 250L/min.

The coated metal coatings were tested for properties and the results are reported in table 1.

Example 2

Weighing the following components in percentage by mass: 5% Ni, 1.8% Nb, 0.05% Hf, 0.04% Ta, 93.11% Al.

Mixing the components, smelting at the vacuum degree of 0.003Pa for 20min under the current of 25A to finish the first smelting; smelting for 25min under the current of 40A to finish second smelting; smelting for 10min under the current of 70A to finish the third smelting; naturally cooling to room temperature after the smelting is finished to obtain an alloy ingot, and then crushing the alloy ingot to 60 mu m to obtain alloy powder.

The alloy powder prepared in the embodiment is coated on the metal surface by adopting a supersonic spraying mode, wherein the supersonic spraying temperature is 160 ℃, the air pressure is 0.5MPa, the powder feeding speed is 50g/min, the spraying distance is 20cm, the moving speed of a spray gun is 1500mm/min, the propane flow rate is 40L/min, and the air flow rate is 230L/min.

The coated metal coatings were tested for properties and the results are reported in table 1.

Example 3

Weighing the following components in percentage by mass: 9% Ni, 1.6% Nb, 0.08% Hf, 0.01% Ta, 89.31% Al.

Mixing the components, smelting at vacuum degree of 0.004Pa for 11min under current of 18A to finish first smelting; smelting for 15min under the current of 45A to finish second smelting; smelting for 5min under the current of 80A to finish the third smelting; naturally cooling to room temperature after the smelting is finished to obtain an alloy ingot, and then crushing the alloy ingot to 80 mu m to obtain alloy powder.

The alloy powder prepared in the embodiment is coated on the metal surface by adopting a supersonic spraying mode, wherein the supersonic spraying temperature is 190 ℃, the air pressure is 0.4MPa, the powder feeding speed is 40g/min, the spraying distance is 18cm, the moving speed of a spray gun is 1000mm/min, the propane flow rate is 35L/min, and the air flow rate is 290L/min.

The coated metal coatings were tested for properties and the results are reported in table 1.

Comparative example 1

The comparative example differs from example 1 in that the mass fraction of Ni is 11.5%, the mass fraction of Al is modified accordingly, and the rest of the data is unchanged, and the prepared metal powder is coated in the same manner as in example 1.

The same performance test as that of comparative document 1 was performed on the coated metal coating layer, and the results are recorded in table 1.

Comparative example 2

The comparative example differs from example 1 in that the mass fraction of Ta is 0.08%, the mass fraction of Al is modified accordingly, and the rest of the data is unchanged, and the prepared metal powder is coated in the same manner as in example 1.

The same performance test as that of comparative document 1 was performed on the coated metal coating layer, and the results are recorded in table 1.

TABLE 1

The above examples show that the alloy powder provided by the invention has high adhesion, salt water resistance of 150 days and salt spray resistance of 1640h, and the metal powder provided by the invention has excellent corrosion resistance after forming a coating; the alloy powder provided by the invention has the hardness of 906HV, the highest shearing strength of 531MPa and outstanding wear resistance; the coating does not lose efficacy at 1950 ℃ and still has the protective effect. In the comparative example, the mass fractions of Ni and Ta are changed, and the performance of the coating is rapidly reduced, so that the alloy powder provided by the application has outstanding performance in the corresponding mass fraction range, and the base material can be effectively and comprehensively protected.

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.