WANLONG
The methods to improve the adhesion of diamond segment matrix are as follows:
Diamond has a series of excellent physical and chemical properties, such as high hardness, high strength, high wear resistance, etc., and is widely used to prepare diamond tools. However, the problems existing in diamond tools, such as insufficient manipulation, particle shedding, oxidation, graphitization, have seriously affected the service life and power of the tools. There are two kinds of methods to improve the adhesion between diamond segment and matrix: metallization by surface The surface roughening method improves the mechanical inlaying force of diamond and matrix; The chemical bond between diamond and metal is formed by means of vapor deposition, chemical plating followed by heat treatment, and salt bath. The above methods can effectively deal with the problem of the binding force of particles in diamond
Diamond belongs to nonmetal and has no good affinity with metal, which results in a high interface energy between diamond and general metal or alloy. Especially when diamond is prepared by electroplating, the manufacturing temperature is low, so that the carbon atoms on the surface of diamond cannot react at the interface, forming carbides so as to complete chemical bond with matrix metal. Diamond particles are only mechanically embedded in the coating substrate. In addition, due to the particularity of diamond surface, The wetness of the electroplating solution to the diamond surface is not good, resulting in gaps between the coating and particles. Although the diamond has experienced high temperatures in the process of preparing diamond by hot pressing, which provides the possibility of forming chemical affinity, when diamond is prepared by hot pressing, the sintering temperature is generally as high as 900 ℃. When the diamond is heated to about 700 ℃ in the air, it begins to lose weight due to oxidation, and the compression resistance can be reduced to more than 1000 ℃
Diamond will be graphitized, which will greatly affect the strength and use of diamond. In view of the above problems, people have adopted various measures to improve the adhesion between diamond and matrix. This paper introduces the method of metallizing and roughening the surface to improve the mechanical inlaying force between diamond and matrix; The chemical bond between diamond and metal is formed by means of vapor deposition, chemical plating followed by heat treatment, and salt bath. The above methods can effectively deal with the problem of the binding force of particles in diamond
