Using pre-alloy technology to achieve brazing connections of diamonds

Since the birth of synthetic diamond in 1954, the application of diamond tools has become increasingly widespread. Among them, diamond saw blades in the stone processing industry are a major area of diamond consumption, accounting for about 90% of the total production of synthetic diamonds. According to domestic and international statistical data, it is estimated that currently about 70% of industrial diamonds are used to manufacture stone processing tools, with diamond circular saw blades making up the vast majority.

During the use of diamond circular saw blades, the utilization rate of diamonds is relatively low. This is because the diamonds in the blade do not fail due to wear but are lost in large quantities in the form of detachment. Traditional diamond blade manufacturing relies on the holding effect of the matrix to fix the diamonds. When the matrix wears down and exposes too much of the diamond, the diamonds will fall off on their own.

Improving the bonding strength between the matrix and the diamond is an effective technical measure to prevent early detachment of diamonds. Unfortunately, it is difficult to connect diamonds with the matrix. Currently, a relatively effective technical measure is to coat the surface of the diamonds with metals such as titanium and nickel to achieve effective bonding between the diamonds and the matrix.

Traditional matrix powders are made of pure metals or simple alloys, which either do not wet the diamonds or lack wettability at sintering temperatures. In research, adding metals such as chromium, titanium, vanadium, zirconium, nickel, and manganese to traditional copper alloys forms pre-alloys. The powder of the pre-alloy contains active elements that wet the diamonds, and during the sintering process of the diamond tips, the active elements diffuse with the diamonds, achieving a brazing connection between the matrix and the diamonds.

Pre-alloy powders can improve the wettability of the alloy to the diamonds, increase the height of the diamond cutting edge, and enhance the utilization rate of the diamonds. On the other hand, powdered brazing materials have a more stable chemical composition than mechanically mixed powders, overcoming issues such as segregation of specific gravity, early melting and enrichment of low melting point metals, oxidation, and volatility. Low melting point volatile metals can be lost during the sintering process, affecting the performance of the matrix, thus ensuring the stability and consistency of the diamond tips.

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