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The role of matrix binder in diamond segment
Publish Date:2021-02-03
Diamond segment is made of diamond and matrix bond through high temperature and high pressure sintering, so matrix bond is an extremely important part of diamond segment. Its composition is mainly metal powder, but also some non-metal powder. High temperature and high pressure form liquid metal. After cooling at room temperature, after the metal solidifies, a stronger sintered segment is formed, which plays a role in fixing the diamond. So does the matrix bond have any other functions besides fixing diamond? Let’s take a look:1. Dispersion and control of diamonds: Dispersion means that the diamonds can be distributed evenly. Many diamonds are together, in the process of cutting the stone, the impact and friction will cause the diamond to fall off very quickly. Therefore, in order to better increase the holding force, the best choice is to disperse the diamonds. Therefore, whether it is the preliminary work of the segment production process of stirring or in the later period sintering, it is intended to melt the metal so that the liquid metal can better disperse the diamond powder, and because the elements used in the matrix bond are mostly close for diamond, it also makes the diamond dispersion more uniform.
2. Make the diamond exposed to a certain extent and provide matching wear: After the sintering of the segment, it needs to be opened. After open, the diamond will be exposed, and the matrix bond is to expose the exposed diamond longer, so the cutting life will be improved, so the matrix bond is mostly matched with the selected diamond wear resistance.
3. Prevent the diamond from falling off prematurely. The diamond in the diamond segment cannot fall too early, so the matrix bond is required to hold it well, including physical and chemical holding power, and after the matrix is melted, it form a new chemical holding power, and at the same time, a harder sintered agglomerate is formed which improves the physical holding power. The two parts of the holding power are improved so that the diamond will not fall off prematurely. It also maximizes the use of diamond, saves material, and increases cutting life.
4. Acting as a heat sink to quickly transfer the heat generated during work: When the saw blade is cutting the stone, it generates a large amount of heat energy during continuous friction. This heat cannot be dissipated in a short time, so it needs to be cooled by cooling water , But if it is an insulator diamond, the heat dissipation is poor, the diamond will be excessively carbonized and the life will be shortened, and the metal matrix bond can help diamond segment to quickly transfer heat to the blade body, and it will be continuously sprayed by cooling water which greatly alleviate the large amount of heat generated during the cutting process.
5. When the diamond is impacted, the matrix bond bears and disperses the impact and load: the diamond segment in the cutting process, the strong impact force is given to the diamond, and the diamond alone cannot withstand it, so such impact will be pass to matrix bond to share the load.
Although diamond is a very important part of the diamond segment, the metal bond forming the united front with it also plays a very important role. Both are indispensable. The quality of which part is poor will cause the quality of the segment to deteriorate or unavailable.
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