Titanizing process for superhard material micro powder

Abstract

The invention discloses a titanizing process for superhard material micro powder. The process comprises the following steps: mixing raw materials, namely mixing a titanium powder coating material and the superhard material micro powder to obtain the mixed raw material; performing vacuum evaporation, namely evaporating the titanium powder coating material on the surface of the superhard material micro powder through a vacuum depositing method to form a titanized superhard material micro-particle semiproduct; separating and purifying, namely dispersing the titanized superhard material micro-particle semiproduct into a fluid medium to form a settling mixed solution, layering and grading the settling mixed solution through a sedimentation method to obtain the titanized superhard material micro-particle fine product; and drying the fine product, namely drying the titanized superhard material micro-particle fine product to obtain the titanized superhard material micro-particle product. By adopting the method, the residual quantity of the titanium powder coating material in the final product is not greater than 0.5%.

Description

technical field [0001] The invention relates to a superhard material surface treatment method, in particular to a titanium plating method for superhard material micropowder. Background technique [0002] With the development of science and technology, the requirements for workpieces are getting higher and higher. Abrasives, as an important branch of mechanical processing, naturally receive more and more attention. Superabrasives such as diamond, cubic boron nitride, boron carbide, etc., are more and more widely used in the tool industry due to their unique high hardness, good thermal conductivity and excellent wear resistance. In the technology of using existing superhard materials to make tools, a layer of metal titanium is usually coated on the surface of superhard materials. Protected from the erosion of air and bonding agents, prolonging the service life of tools and improving processing efficiency. [0003] The prior art mainly uses methods such as physical vapor depo...

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Problems solved by technology

[0003] The prior art mainly uses methods such as physical vapor deposition (PVD), chemical vapor deposition (CVD), and vacuum deposition to plate titanium on the surface of diamond and other superhard material particles, but these methods have certain drawbacks, such as PVD. Due to the low reaction temperature of the coating, the bonding force between the coating and the diamond particles is low. In addition, the gas generated during the preparation of the coating is difficult to penetrate to the bottom of the deposited diamond particles, which makes the coating efficiency low. Although the coating prepared by CVD method has a high bonding force with diamond particles, the gas participating in the reaction during the preparation of the coating and the tail gas remaining after the reaction are all corrosive, flammable and toxic to a certain extent. Equipment, environment, and operators all bring certain potential safety hazards; although the coatings prepared by vacuum deposition do not have the above disadvantages, they also have high coating efficiency, but they are usually filtered by screens, such as vibrating screens. Separation of titanium powder, so that the content of titanium powder remaining in the product reaches more than 5%, and the separation method also limits the particle size of the final product to more than 1000 mesh, that is, the diameter of the final titanium-coated superhard material particle is greater than 15 microns, thus affecting The purity and use effect of the product, and a large amount of plating metal needs to be consumed in the preparation process of the coating, which makes the production cost too high

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