On the other hand, a method of synthesizing large diamond crystals of good quality is disclosed in U.S. However, large diamond crystals of high quality cannot be synthesized by the aforementioned method. Considerable quantities of fine diamond powder have been synthesized by this method to be applied to, e.g. According to this method, diamond is spontaneously nucleated, and rapidly grows until it reaches a certain size. According to such a method, the solvent metal penetrates into the carbon material, whereby the carbon is caused to diffuse through the solvent metal which is in the form of a thin film, to generate diamond. A stable high pressure and temperature whereby the carbon is converted into diamond under the action of the solvent metal is used. In one method, carbon material to be converted to diamond is mixed or brought into contact with a solvent metal such as iron, cobalt or nickel. There are two general methods for synthesizing diamond using high temperature and high pressure.
Thus, diamond is a material for which there are no comparable substitutes. Furthermore, extremely pure diamond has additionally the highest thermal conductivity and the highest transmittance in the infrared spectrum. The present invention relates to a wire drawing die made of synthetic single crystal diamond which is used for various purposes such as drawing copper wire for winding, steel cord, stainless steel wire, welding wire, and the like and it relates to a method of producing wire drawing dies by cleaving diamond.ĭiamond is a material having the greatest hardness and highest modulus of elasticity of all known materials.
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