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Polished Diamonds, The New Technology

International Trade and Industry Institute Tohoku Institute of Technology and Application of Diamond developed a rapid low cost diamond polishing technology.Diamond is the hardest known material, and has high thermal conductivity. Therefore, they are not only making jewelry with precious stones, it also has important industrial uses. Since about 50 years ago, the first man made diamonds at high pressure and high temperature conditions created after the synthetic diamond powder has been widely used in the manufacture grinder diamond blade and cutting blade.

About 20 years ago, the Japanese developed a method using Chemical Vapour Deposition of synthetic diamond technology. Through this technology, can produce a few to tens of centimeters square diamond. This diamond coated film can be applied to the surface of ultra precision machining equipment, electronic components, radiators, can increase the performance of mobile telephone two to three times the high frequency SAW filters in the direct sunlight is still visible under the diamond flat panel display and can work at 700 C when the diamond semiconductor. Chemical precipitation of diamond production (or CVD diamond) products will be used in various industrial fields. Therefore, the synthesis of diamond chemical vapor deposition, or CVD diamond, estimated to form a 1 10 trillion yen worth of trades.No fixed form class diamond carbon (DLC) is a less than 0.1 microns thick diamond films with very smooth surface, its application in the lubrication field is developed. And is expected to have many industrial uses of thick CVD diamond film surface is rough. The thicker the film surface becomes rough and uneven film is one third. The CVD product can not be uneven surface, so thick diamond film must be polished.

Like jewelry, like diamonds, industrial diamonds have been polished before sale. As the old saying goes: “to rule Yi Yi.” CVD diamond polishing with diamond polisher needs. However, there is an important problem to solve. Polished relatively softer (hardness of 100 or 110) single crystal to use is very hard (111) diamond powder. In CVD diamond polishing, the polished surface of CVD diamond devices because of the same hardness (111) are subject to the same degree of wear. Here, polished CVD diamond is a very costly process.To avoid this problem, it has developed a method of polishing CVD diamond: with hot metal plate in a vacuum pressure to make diamonds, graphite, making it the surface becomes smooth. However, this method is very difficult, because of the need in a vacuum to operate under high temperature conditions. Diamond can be laser cut, but the cutting edge is still too rough.This application by the Institute and the development of new diamond polished solve all these problems. Titanium alloy plate at room temperature under normal pressure in the diamond to diamond, as smooth as a mirror. Titanium alloy sheet is sintered alloy (TiAlX, X for chromium, manganese, etc.) made. The titanium alloy was synthesized by mechanical alloy.

Synthesis machinery, including steps to join the raw material powder ball for more than 100 hours of grinding machine to form a very fine alloy powder. Then the alloy powder by pulsed discharge sintering and for some time. To form the aluminum into the titanium material, its microstructure is one micron in diameter, composed of micro grains.Synthesis by mechanical alloying into melting into the legal system than with a more refined structure, and the almost non existent gap between components to its degree and the hardness is about twice the casting material. And its intensity increases with temperature increase. Their strength at 600 C. At room temperature, higher than 50%. This feature make it a polished diamond capabilities. CVD diamond and the rough surface grinding of titanium alloy devices in a small range of contacts, the friction heat generated by the temperature can rise to 1000 degrees Celsius.

Grinder were important rife with diamond in titanium has a strong affinity for carbon, so that decomposition of the contact point of the diamond, titanium carbide and titanium form. Titanium carbide rotary mill was removed to form a mirror like polished diamond surface. If the rotating disk made of titanium alloy hardness at high temperatures in the lower, or steel instead of titanium alloy pressure on the diamonds, diamonds rough surface of metal materials can only be filled without achieving its purpose grinding.Titanium alloy mill, a 4X8 mm CVD diamond can be worn in 5 minutes, a mirror smooth. Wear a small grinding machine, so this method than using the diamond grinder cheaper.This photo taken with an optical microscope showed the air and at room temperature titanium alloy grinder grinding a minute a dark part of the CVD diamond surface has not been polished, bright parts have been polished. In the grinding process of ultrasound imaging can be used to avoid film rupture or monitor off.Not only CVD diamond, sintered diamond tools, and single crystal diamond is very easy to use this intermetallic compound made of polished rotary grinder. This approach is expected to be a cheap and high precision diamond machining technology.

May 17, 2010 Posted by | Computers & Technology | , , , , , , | Leave a comment