Diamond has a high hardness, high strength, high wear resistance and a series of excellent physical and chemical characteristics, widely used in the preparation of diamond tools. However, the lack of holding power, particle shedding, oxidation, graphite and other problems existing in diamond tools seriously affect the service life and efficiency of the tool. Two types of methods to improve the binding force of diamond segment and tread body are: the mechanical inlay force of diamond and tread body is improved by surface metallization and surface coarseness method, and the chemical bonding of diamond and metal is formed by gas phase deposition method, chemical plating and post-heat treatment method and salt bath method.
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By implementing the above methods, the binding force of particles in diamond tools can be effectively solved. Diamond is a non-metallic, and does not have a good affinity with the metal, resulting in a high interface between diamond and ordinary metals or alloys. Especially when preparing diamond tools by electroplating method, the manufacturing temperature is low, the carbon atom on the diamond surface can not be interfaced to react, the carbon icing is generated and the tread metal is combined with chemical bonds, and the diamond particles are only mechanically embedded in the coating substrate. In addition, due to the particularity of the diamond surface, the electroplating liquid is not wet against the diamond surface, resulting in a gap between the coating and the particles. Although diamond experienced high temperatures in the process of preparing diamond tools by thermal pressure method, which provided the possibility of forming chemical affinity, when preparing diamond tools with thermal pressure, the sintering temperature is generally as high as 900 degrees C, and when the diamond is heated in the air to about 700 degrees C, it begins to produce oxidation weightlessness and reduce the resistance to pressure.
Above 1000 degrees C. Diamond graphite will occur, which greatly affects the strength of diamond and the effect of its use. In view of the above problems, various measures have been adopted to improve the binding force of diamond and tread body. This paper introduces the method of surface metallization and surface coarsening to improve the mechanical mosaic force of diamond and tread, and the chemical bonding of diamond and metal is formed by gas deposition method, chemical plating and post-heat treatment method and salt bath method. By implementing the above methods, the binding force of particles in diamond segment can be effectively solved.
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