1. Brazing technology Diamond Tools Application of the difficulty
Diamond High hardness and superb mechanical properties make diamond Tool Processing difficult supplies into a assortment of important and powerful tool. Metal base of the diamond matrix adhesion (matrix package Xiang capability) that have an effect on life and performance of diamond tools for one of the main factors.
As diamond in between ordinary metals and alloys with higher interfacial power, resulting in diamond particles can not be normally low melting point alloy by infiltration, poor adhesion, in the conventional manufacturing technology, the diamond particle matrix alone shrink after the mechanical clamping force embedded in the matrix metal base, even though not formed a sturdy chemical bonding, or metallurgical bonding, resulting in diamond particles in the work simply with the matrix metal-based separation and drastically decrease the life of diamond tools and level of efficiency. Most of impregnated diamond-kind tool in reduce utilization, a big quantity of pricey diamond in the perform off into the loss of the litter. Lin Zengdong the 1st use of diamond and other metal surface, the surface of diamond technologies to give several new attributes, such as excellent thermal conductivity, good heat stability, enhance the current physical and chemical properties of metal or alloy to boost its answer infiltration and so on.
Diamond metallization issue in the final century, it triggered 70 years of diamond tool manufacturing sector, domestic and international consideration. Numerous people working in the sintering method to achieve the surface metallization of diamond, add in the matrix material or in the diamond surface pre-glue powerful carbide metal powder (with out heating diamond ahead of 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. Despite the fact that the literature has demonstrated a quantity of metals such as tungsten (not oxidized) at a reduced 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 circumstances, 600 heating more than 1 hour to get excellent adhesion. The existing frequently utilised impregnated diamond cutting tools sintering circumstances of view, the non-vacuum or low vacuum does not exceed 900 heat five minutes or so, it is unlikely to generate 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 procedure, according to hot temperature and employed inside such a brief time, this method is extremely inadequate. In the strong-phase sintering conditions (often a small quantity of low-intensity low melting point metal or alloy liquid phase), matrix chemical bonding of the diamond or metallurgical bonding is extremely weak or does not type.
Pre-metallized diamond surface is not the ultimate purpose, but only the expectations and carcass chemical metallurgical bonding metal to accomplish one particular of the measures. After plating the sintered diamond Saw (Drilling) teeth, its broken surface exposed had been lost diamond coating, and off the diamond surface is very smooth residual pit, this phenomenon appears to clarify the diamond and matrix also failed to obtain the level of chemical package Xiang. So even if the surface to attain a pre-metallization of diamond, the classic solid state powder metallurgy sintering can not be realized between the diamond and the strong matrix material combination.
The late eighties of last century, individuals started to explore the technology for brazing diamond tools production. In the diamond surface coated with some transitional elements (such as Ti, Cr, W, and so forth.), and the surface chemical reaction with the formation of carbides. Via this layer the part carbide, diamond, bond, three matrix can be accomplished by way of strong chemical brazing metallurgical bonding to obtain a real diamond surface metallization, this is the diamond brazing logic. From published patents and articles can be seen, the technologies enables a diamond blade value reaches the maximum size of 2 / 3, tool life was enhanced three times far more than the worth beneath the conventional significantly less than 1 / 3, the worth can be used to let the blade to open stability of the blade edge up to the worth of function to get the time. As a result, the use of brazing technology is anticipated to achieve matrix metal (solder) and the parent material? Diamond and a strong steel substrate mixture among.
2. Brazed diamond tools Analysis
Present, with the fabrication of brazed diamond (or cubic boron nitride) tools have begun to turn into a hot technology, but is restricted to single tool to accomplish the multi-storey “impregnated” published the benefits have not been identified.