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Brazing technology in terms of diamond tools

  • Author:Sherry Huang
  • Source:www.boreway.net
  • Release on:2015-10-04
Due to the interface between the diamond and the general high metal alloys can, causing the diamond particles can not be a general low-melting alloy infiltration, poor adhesion, traditional manufacturing techniques, the diamond particles alone produces mechanical gripping force after the carcass shrink embedded in the matrix metal base, but did not form a strong chemical bonding or metallurgical bonding, resulting diamond particles work easily separated from the carcass metal base, greatly reducing the diamond tool life and performance levels. Most of diamond impregnated type tool utilization is low, a lot of work off the loss of expensive diamond in the litter. Linzeng Dong et pioneered the use of the diamond surface metallization techniques to impart the diamond surface many new features, such as excellent thermal conductivity, good thermal stability, improving its original physical and chemical properties of the metal or alloy to improve its wettability and other solution.

Problem on the diamond surface metallization 1970s caused a diamond tool manufacturing sector at home and abroad are highly valued. Many people committed to the sintering process to achieve the diamond surface metallization of study, matrix material added or diamond surface pre-glue strong carbide metal powder (before this diamond is not heated, does not chemically react with the coating, can only belong to diamond pack clothing), to expect them to achieve the sintering process of diamond chemical bond. Although the literature has demonstrated some metals such as tungsten (not oxidized) low temperature (about 800 ℃) can be formed on the surface WC layer of diamond.

However, to achieve a pre-metallized diamond surface by the process point of view, to be under vacuum above 600 ℃ heated over one hour to get adhesion. In currently used impregnated diamond cutting tools sintering conditions point of view, non-vacuum or low vacuum does not exceed 900 ℃ heat 5 minutes or so, it is unlikely to generate a diamond surface metallization layer. Because both active metal atoms (Ti, V, Cr, etc.) to the diamond surface enrichment has reached interface reaction binding agent are metallurgically bonded diamond atomic diffusion process, pressing the temperature and such a short time in accordance with this process extremely insufficient. Solid phase sintering conditions (sometimes a small amount of low-intensity low melting point metal or alloy liquid phase), the carcass of the chemical bonding of diamond or metallurgical bonding is very weak or no form.

Pre-metallized diamond surface is not the ultimate goal, but only the desired combination of measures to achieve one of the chemical metallurgy and metal carcass. Sintered diamond saw (drill) teeth after plating, its broken surface of the exposed diamond coating are lost, and the loss of residual pit diamond surface is very smooth, this phenomenon seems to explain the diamond and matrix also failed to meet chemical package inserts levels. So even realized premetallised diamond surface, conventional solid-phase powder metallurgy sintering method is also impossible to achieve a solid combination between diamond and matrix material.

In the late eighties of last century, people began to explore the brazing technology for the production of diamond tools. Coated diamond surface using certain transition elements (e.g. Ti, Cr, W, etc.), and the surface chemical reaction occurs to form carbides therewith. Through the role of this layer of carbide, diamond, binding agents, matrix can be a solid three chemistry achieve metallurgical bonding by brazing, in order to achieve real diamond surface metallization, which principle diamond braze. As can be seen from the article published patent, the technology enables a diamond blade reaches maximum diameter of 2/3, tool life increased by 3 times, and this value is less than 1/3 of conventional, allowing the blade protrusion values ??are available up to a stable job When the edge value to obtain. Therefore, the use of brazing technology is expected to achieve matrix metal (solder) and the parent material - Firmly bonding between diamond steel substrate.