Silicon Nitride
New research trends in special cutting tools ceramic
title = "special new ceramic tool materials"> New tool special ceramic materials there, which is the first time through the use of inorganic ceramic mechanical cutting reform revolution technology of the new results. About 100 years ago in Europe, Germany and Britain have begun to use the tool to replace ceramic knives traditional carbon steel.
Special ceramic materials due to its high hardness and high temperature of a new generation of tool material, but also known for its ceramics limited fragile, therefore, how to overcome the fragile ceramic tool materials, increase its hardness, as the last century ceramic tools on the main issues. The application of ceramics is also growing.
Engineering and technology sector and efforts to promote the development of ceramic tools of the main reasons:
(1) can greatly improve metal cutting and processing, and other aspects of production efficiency
(2) of valuable land resources to consider
This is due to a high speed steel and carbide tungsten major component in the depletion of global resources in the field of decision. According to the geological departments concerned in recent years preliminary estimate, the use shown in the world of tungsten resources Jingou 50 hours. Tungsten is the scarcity of resources in the world, but the cutting tool material consumption is large, resulting in the price of tungsten ore rising, rising for decades in good times, to some extent, promoted the development of ceramic knives and promotion tool ceramics research and development has achieved remarkable results.
Currently used for special ceramic tool has become the alumina ceramic material, aluminum  »metal ceramic aluminaÂ" ceramic, carbide alumina, a "metal-carbide ceramic," alumina nitride ceramic and metal success of recent investigations of boron nitride ceramic tools and silicon nitride ceramics and other materials. But speaking on a global scale, not only Germany ceramic tool for machine tools in general, and is highly efficient and stable can * control of the machine tool for processing and automated production lines in Japan for ceramic blade products, performance and quality in the international advanced level in the United States oxides  »carbideÂ" nitride ceramic tool has developed the leading position in the world. Similarly existing tool for special China ceramic research, development and implementation also is conducting a series of results.
1, alumina ceramic tool: the special ceramic materials, the use of additives such as Al2O3 Pure is conducive to the strengthening of Al2O3 bending force, but a decrease of temperature, or as pure alumina target = "_blank" title = "View ceramic material suppliers of China "> ceramic material better. Al2O3 temperature in hardness at room temperature and ceramic high hardness is greater than carbide materials. Al2O3 ceramics at room temperature in terms of bending resistance, albeit lower, but with the use of temperature rise, but reduced under flexion position. On the basis of the characteristics used for high speed cutting is quite appropriate. Al2O3 ceramics at room temperature and high temperature strength is good, in particular, can overcome the general high-speed steel and carbide cutting blades easy tool shape deformation and weaknesses collapse. In addition, Al2O3 ceramic heat in the physical and anti-oxidation, anti-caking and chemical aspects of inertia can flourish. Without But alumina ceramic tool when cutting pieces of steel and iron alloys have greater cohesion and wear and tear gap. With history as the longer tool material, alumina ceramic tool that best suits the high-speed carbide cutting brittle materials such as cast iron chilled or hardened steel, mechanical parts and components for large parts used in high precision cutting and cutting processing. Alumina ceramic tool in the short term, small pieces, cutting pieces of steel flashing and Mg, Al, Ti and Be-quality materials, and other materials and alloys, of a less effective, easy to carry or knives in a proliferation of collapse and the fall of the leaf, and other defects, it is clear this is their lack of fly in the ointment.
2, alumina, a ceramic metal ': Al2O3 ceramic tool to improve the toughness, the introduction of material below 10% of Cr, Co, Mo, W, Ti, Fe and other elements metal, which is metal Al2O3 ceramics, the density of this material, anti - - Bending strength and hardness are improved. However, due to the alumina  "creep metal-ceramic tool of low intensity, the oxidation of the poor, and later to promote the use of the poor.
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