Synthetic diamond is a superhard material and the hardest substance in the world. It is very versatile. However, at room temperature, the synthetic diamond is a metastable phase, and its heat resistance is not good. When heated to 700 ° C or higher in air, oxidation or graphitization occurs. In addition, because diamond has a high interface with most metals, ceramics and even resins, the bonding strength between diamond and substrate can be poor, which is easy to cause early diamond shedding. Therefore, improving the bonding strength of diamond to its matrix is ​​a key factor in improving the processing efficiency and service life of diamond tools. At present, at home and abroad, a method of plating a layer of metal on the surface of diamond is generally used to reduce the interfacial energy between the diamond and the substrate, and a stable combination of the metal and the binder is formed by the metal, and the method of generating burrs by electroless plating and electroplating is generally adopted in the country. In foreign countries, the method of electroless plating to produce tumor thorns is realized. Compared with the former, the latter can increase the strength of the diamond, and the holding force between the particles and the binder is enhanced, and the service life of the manufactured tool can be greatly prolonged. After years of development and testing, the research succeeded in a new process of diamond electroless plating and a special electroless plating solution, which can achieve the plating effect of similar foreign products. The process has the advantages of obvious unevenness on the surface of the plated diamond, the roughness of which can be fascinating with foreign products, strong adhesion of the plating layer, good compressive strength and heat resistance, and the coating is not a pure nickel film, but A nickel-phosphorus alloy has a short plating time. If it reaches 60%, it has a weight gain. It only needs to be plated in the plating solution for about 1 hour, and the equipment is simple and the investment is small.
Xiao Zhipei, Zhengzhou Institute of Minerals Comprehensive Utilization, Ministry of Land and Resources
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