Brazing technology in the production of diamond tools - hardware, wheel, grinding - Hardware Industry

1. Brazing technology Diamond Tools Application of the problem Diamond High hardness and excellent mechanical properties make diamond Tool Processing hard materials into a variety of essential and effective tool. Metal base of the diamond matrix adhesion (matrix package Xiang ability) that affect life and performance of diamond tools for one of the main factors.

As diamond between ordinary metals and alloys with high interfacial energy, resulting in diamond particles can not be generally low melting point alloy by infiltration, poor adhesion, in the traditional manufacturing technology, the diamond particle matrix alone shrink after the mechanical clamping force embedded in the matrix metal base, while not formed a strong chemical bonding, or metallurgical bonding, resulting in diamond particles in the work easily with the matrix metal-based separation and greatly reduce the life of diamond tools and level of performance. Most of impregnated diamond-type tool in lower utilization, a large number of expensive diamond in the work off into the loss of the litter. Lin Zengdong the first use of diamond and other metal surface, the surface of diamond technology to give many new features, such as good thermal conductivity, good heat stability, improve the existing physical and chemical properties of metal or alloy to improve its solution infiltration and so on.

Diamond metallization problem in the last century, it caused 70 years of diamond tool manufacturing sector, domestic and international attention. Many people working in the sintering process to achieve the surface metallization of diamond, add in the matrix material or in the diamond surface pre-glue strong carbide metal powder (without heating diamond before this did not happen with the chemical coating reaction, can only belong to diamond coating), to expect them to achieve the diamond sintering process of chemical bonding. Although the literature has demonstrated a number of metals such as tungsten (not oxidized) at a lower temperature (800 or so) can be formed on the surface WC layer in diamond, but to achieve pre-metallized diamond surface used in the process of view, be in a vacuum conditions, 600 heating over 1 hour to get good adhesion. The current commonly used impregnated diamond cutting tools sintering conditions of view, the non-vacuum or low vacuum does not exceed 900 heat 5 minutes or so, it is unlikely to produce metallized diamond surface layer. Regardless of active metal atoms (Ti, V, Cr, etc.) to the diamond surface or interfacial reaction was enriched with diamond metallurgical bond is atomic diffusion process, according to hot temperature and used within such a short time, this process is extremely inadequate. In the solid-phase sintering conditions (sometimes a small amount of low-intensity low melting point metal or alloy liquid phase), matrix chemical bonding of the diamond or metallurgical bonding is very weak or does not form.

Pre-metallized diamond surface is not the ultimate goal, but only the expectations and carcass chemical metallurgical bonding metal to achieve one of the measures. After plating the sintered diamond Saw (Drilling) teeth, its broken surface exposed were lost diamond coating, and off the diamond surface is very smooth residual pit, this phenomenon seems to explain the diamond and matrix also failed to achieve the level of chemical package Xiang. So even if the surface to achieve a pre-metallization of diamond, the traditional solid state powder metallurgy sintering can not be realized between the diamond and the solid matrix material combination.

The late eighties of last century, people began to explore the technology for brazing diamond tools production. In the diamond surface coated with some transitional elements (such as Ti, Cr, W, etc.), and the surface chemical reaction with the formation of carbides. Through this layer the role carbide, diamond, bond, three matrix can be achieved via strong chemical brazing metallurgical bonding to achieve a real diamond surface metallization, this is the diamond brazing logic. From published patents and articles can be seen, the technology enables a diamond blade value reaches the maximum size of 2 / 3, tool life was increased three times more than the value under the conventional less than 1 / 3, the value can be used to allow the blade to open stability of the blade edge up to the value of work to get the time. Therefore, the use of brazing technology is expected to achieve matrix metal (solder) and the parent material? Diamond and a solid steel substrate combination between.

2. Brazed diamond tools Research Present, with the fabrication of brazed diamond (or cubic boron nitride) tools have begun to become a hot technology, but is limited to single tool to achieve the multi-storey "impregnated" published the results have not been found.

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