阅读说明：本技术 一种粉末冶金靶材紫金镀膜方法 (Powder metallurgy target material purple gold coating method ) 是由 王浩 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种粉末冶金靶材紫金镀膜方法。其特征在于,包括如下步骤：1)将含有金和铝的粉末混合均匀,装入压制模具中压制成型,取出压坯后运用粉末冶金的方法进行不完全烧结,取出后冷却以获得合金靶材；2)运用物理气相沉积技术将步骤1中获得的合金靶材镀到待镀物体表面,在待镀物表面形成以非晶态为主的镀膜,对镀膜进行热处理,获得以金、铝两种元素按原子比例1：2形成的AuAl2金属间化合物为主体的紫色镀膜。本发明属于镀膜合金靶材镀膜技术领域,具体是一种利用物理气相沉积技术和粉末冶金法进行紫金镀膜的粉末冶金靶材紫金镀膜方法。(The invention discloses a powder metallurgy target material purple gold coating method. The method is characterized by comprising the following steps: 1) uniformly mixing powder containing gold and aluminum, putting the mixture into a pressing die for pressing and forming, taking out a pressed blank, performing incomplete sintering by using a powder metallurgy method, and cooling the pressed blank to obtain an alloy target material; 2) plating the alloy target obtained in the step 1 on the surface of an object to be plated by using a physical vapor deposition technology, forming a coating film mainly in an amorphous state on the surface of the object to be plated, and performing heat treatment on the coating film to obtain a coating film containing two elements of gold and aluminum according to an atomic ratio of 1: 2, and 2, the formed AuAl2 intermetallic compound is a purple coating film mainly. The invention belongs to the technical field of coating alloy target materials, and particularly relates to a powder metallurgy target material purple gold coating method for carrying out purple gold coating by utilizing a physical vapor deposition technology and a powder metallurgy method.)

1. The method for coating the powder metallurgy target material with the purple gold is characterized by comprising the following steps of:

1) uniformly mixing powder containing gold and aluminum, putting the mixture into a pressing die for pressing and forming, taking out a pressed blank, performing incomplete sintering by using a powder metallurgy method, and cooling the pressed blank to obtain an alloy target material;

2) plating the alloy target obtained in the step 1 on the surface of an object to be plated by using a physical vapor deposition technology, forming a coating film mainly in an amorphous state on the surface of the object to be plated, and performing heat treatment on the coating film to obtain a coating film containing two elements of gold and aluminum according to an atomic ratio of 1: 2, and 2, the formed AuAl2 intermetallic compound is a purple coating film mainly.

2. The method according to claim 1, wherein the sintering temperature for sintering in step 1 is 300 ℃ to 400 ℃.

3. The method of claim 2, wherein the sintering temperature for the incomplete sintering in step 1 is 30 to 120 minutes.

4. The method for coating the powder metallurgy target with the zijin according to claim 1, wherein the heat treatment temperature in the step 2 is 300 ℃ to 400 ℃.

5. The powder metallurgy target material zijin coating method according to claim 4, wherein the heat treatment heat preservation time in the step 2 is more than 10 minutes, and a clear purple color appears when the film layer is cooled to normal temperature.

6. The method according to claim 1, wherein the mass fraction of gold in the mixed powder component in step 1 is 76% to 83%, the mass fraction of aluminum is 17% to 24%, and the mass fraction of other elements is less than 5%.

7. The method of claim 1, wherein the relative density of the green compact in step 1 is greater than 90%.

8. The method for coating the powder metallurgy target with the zijin according to claim 1, wherein the object to be coated in the step 2 is a metal product.

Technical Field

The invention belongs to the technical field of coating alloy targets, and particularly relates to a powder metallurgy target purple gold coating method.

Background

An intermetallic compound is a compound consisting of two or more metals in which the number of atoms of the different metals is at or near a simple ratio, and in most cases, the intermetallic compound solidifies at a fixed temperature and composition, and thus exists in a narrow range. The crystal structure of an intermetallic compound is usually different from the crystal structure of the individual metals that consist of it. The fundamental properties of intermetallic compounds are high brittleness, accompanied by low toughness, high hardness, good wear resistance and good corrosion resistance.

The target material used by the existing coating technology is mainly finished by a casting technology, the production efficiency of the target material by the casting technology is high, the coating process is relatively simple, but the target material cannot be widely used in the coating field of colored intermetallic compounds.

Noble metal intermetallic compounds are widely used in various fields. While they are brittle in nature, which may limit their use, this limitation can be overcome by using powdered compounds, coatings and materials inlaid with dual metal castings, and the inherent brittleness of the colored gold intermetallic compounds can be improved by adding minor amounts of alloying (<2 wt%), such as aluminum, palladium, copper or silver.

AuAl2 is a well-known colored intermetallic compound, and a coating consisting of it appears to be clear purple in human vision after heat treatment at 350 ℃. The prior art uses a casting technology to manufacture a target material for coating, but cannot manufacture a target material of an AuAl2 colored intermetallic compound. How to successfully apply the colored intermetallic compound AuAl2 to the field of film plating and realize large-scale production is a big problem of the existing purple gold film plating process.

Disclosure of Invention

In order to solve the existing problems, the invention provides a powder metallurgy target material zijin coating method for performing zijin coating by utilizing a physical vapor deposition technology and a powder metallurgy method.

The technical scheme adopted by the invention is as follows:

a powder metallurgy target material purple gold coating method comprises the following steps:

1) uniformly mixing powder containing gold and aluminum, putting the mixture into a pressing die for pressing and forming, taking out a pressed blank, performing incomplete sintering by using a powder metallurgy method, and cooling the pressed blank to obtain an alloy target material;

2) plating the alloy target obtained in the step 1 on the surface of an object to be plated by using a physical vapor deposition technology, forming a coating film mainly in an amorphous state on the surface of the object to be plated, and performing heat treatment on the coating film to obtain a coating film containing two elements of gold and aluminum according to an atomic ratio of 1: 2, and 2, the formed AuAl2 intermetallic compound is a purple coating film mainly.

The target material used by the coating method is a coating material for coating prepared by a powder metallurgy method. The powder metallurgy method comprises complete sintering and incomplete sintering, wherein the complete sintering is usually adopted, and the incomplete sintering is selected in the invention, so that the effect of overcoming the brittleness of intermetallic compounds is achieved.

Physical vapor deposition technology has been used as early as the beginning of the 20 th century, has been rapidly developed in the last 30 years, has been widely used, and is well known and commonly used. The physical vapor deposition technology can be divided into three process steps:

1) gasification of the plating material: even if the plating material is evaporated, dissimilated or sputtered, that is, a vaporization source is formed by vaporization of the plating material;

2) migration of plating material atoms, molecules or ions: atoms, molecules or ions are supplied from a gasification source and generate various reactions after collision;

3) the plating material atoms, molecules or ions are deposited on the substrate after migration.

Further, the sintering temperature at which sintering is not completed in the step 1 is 300 ℃ to 400 ℃.

Further, the sintering holding time of the incomplete sintering in the step 1 is 30 minutes to 120 minutes.

The key point of incomplete sintering is to control the sintering temperature and time and ensure that the metal powder only has surface atoms which are mutually diffused and not completely fused together. Because only limited mutual diffusion occurs on the powder surface layer, the target material main body keeps the inherent characteristics of alloy metal and can be cut, and if the target material is mixed with a small amount of other elements or the mixture ratio of the target material is adjusted, the alloy metal does not affect the mutual diffusion of the gold and the aluminum according to the atomic ratio of 1: 2 formation of a violet coating film of the AuAl2 intermetallic compound host.

Further, the heat treatment temperature in the step 2 is 300 ℃ to 400 ℃.

Further, the heat treatment heat preservation time in the step 2 is longer than 10 minutes, and clear purple is shown when the film layer is cooled to the normal temperature.

Further, in the step 1, the mass fraction of gold in the mixed powder component is 76% to 83%, the mass fraction of aluminum is 17% to 24%, and the mass fraction of other elements is less than 5%.

Further, the relative density of the green compact in the step 1 is more than 90%.

Further, the object to be plated in the step 2 is a metal product.

After the physical vapor deposition technology is applied, the obtained coating film is mainly in an amorphous state, the temperature is increased by a heat treatment method, the atom movement is enhanced, and a film layer with an AuAl2 intermetallic compound as a main body is formed, so that a clear purple coating film can be shown.

By adopting the scheme, the invention has the following beneficial effects:

1. the coating method adopted by the invention breaks through the situation that the existing coating technology does not select the powder metallurgy method to manufacture the target, obtains breakthrough progress and breaks through the thinking fixed mode that the coating efficiency of the powder metallurgy manufactured target is not as good as that of the casting manufactured target;

2. the target material of the AuAl2 can be manufactured by using a powder metallurgy method, the brittleness of the colored intermetallic compound AuAl2 can be effectively reduced by the target material manufactured by incomplete sintering of the powder metallurgy method, the manufactured target material can be normally used for coating, and the coating color is clear purple, so that the problem that the target material for coating is manufactured by using a casting technology but the target material of the AuAl2 colored intermetallic compound cannot be manufactured in the prior art is solved;

3. the target manufactured by using the powder metallurgy method can be directly molded into the specification and size required to be used, the coating can be performed, the coating operation is performed by combining the physical vapor deposition technology, the smoothness of the coating process can be ensured, the production efficiency is high, the error rate is low, the technical progress of purple coating is greatly promoted, and the purple coating is applied to large-scale production, the problem that the target manufactured by using the casting technology in the existing coating technology is coated, but the target manufactured by using the casting technology cannot be molded into the specification and size required to be used at one time is effectively solved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

1) taking about 400-mesh gold powder and aluminum powder, and mixing the gold powder and the aluminum powder according to the atomic ratio of 1: 2, total amount 90 g; placing the mixture into an agate ball milling tank, mixing the mixture by ball milling for 15 minutes, taking out the uniformly mixed metal powder, placing the metal powder into a pressing mould, and pressing and forming the metal powder by using a 300-ton hydraulic press;

2) taking out the pressed compact, sintering at the temperature of 360 ℃ and keeping the temperature for 1 hour, taking out the pressed compact and cooling in the air to obtain the target material;

3) coating with a coating machine, wherein the steel sheet can be used as a test piece, the test piece has bright and clean surface and meets the general requirement of coating, the coating process is as common rose gold coating, the coating time is 1.2 times, the test piece is taken out,

4) and preserving the heat for 30 minutes at the temperature of 360 ℃, taking out the film and cooling the film in the air to obtain the clear purple coating film.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.