Preparation process of nickel-coated silicon carbide powder for surface enhancement of impression of hot forging mold

Abstract

The invention relates to a preparation process of nickel-coated silicon carbide powder for the surface enhancement of an impression of a hot forging mold. The preparation process comprises the following steps of: putting pretreated silicon carbide powder in a chemical nickel-plating device to carry out plating, wherein the formula of plating solution is as follows: the nickel sulfate as a main salt is 30g / L, the sodium hypophosphite as a reducing agent is 30g / L, a complexing agent adopts 20g / L malic acid and 20g / L sodium succinate, thiourea as a stabilizing agent is 1.5-2.5mg / L, the loading rate of the pretreated silicon carbide powder is 20-25g / L, the plating temperature is 85-90 DEG C, the pH value of the plating solution is 4.0-4.8 in the plating process by refilling 5%NaOH solution, and then the nickel-coated silicon carbide powder can be obtained. The preparation process has the beneficial effects that the reaction speed is fast, the cost is low, the coating quality is good and the coating layer is compact and uniform; the service cycle of plating solution is long; the bonding performance with other metal bonding phases when the nickel-coated silicon carbide powder is used for the surface enhancement of the impression is good, and the surface-enhanced layer of the impression is compact.

Description

technical field [0001] The invention belongs to the technical field of surface modification of ceramic powder, and in particular relates to a preparation process of nickel-coated silicon carbide powder for strengthening the surface of a cavity of a hot forging die. technical background [0002] Silicon carbide is considered to be one of the most promising materials in the field of semiconductor materials because of its excellent performance. At the same time, silicon carbide, as a ceramic material, has high strength, high hardness, wear resistance, corrosion resistance, low thermal expansion coefficient, High thermal conductivity and other advantages have also been widely used in the field of metal-ceramic composite materials, and have become one of the research hotspots in the field of new materials. The hot forging die is a kind of important forming equipment, which is used to forcibly form the hot metal blank. Its service environment is very harsh. In addition to bearing ...

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Problems solved by technology

[0004] The physical method is represented by vapor phase deposition. However, for silicon carbide powder, it is firstly difficult to suspend in the reaction chamber, secondly, the thickness of the coating is small, and thirdly, the cost is high, so it is difficult to realize industrial scale production

[0005] The main chemical method is electroless plating, which is simple and easy to operate, low in cost, and easy to produce on a large scale. However, it is difficult to apply because of the uncontrollable reaction and the easy decomposition of the plating solution.

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