Abstract:
A method for producing a semiconductor diamond containing boron by the high pressure synthesis method, wherein a graphite material to be converted to the semiconductor diamond is mixed with boron or a boron compound, formed and fired, in such a way that the resultant graphite material contains a boron component uniformly dispersed therein and has an enhanced bulk density, a high purity and a reduced content of hydrogen.
Abstract:
PROBLEM TO BE SOLVED: To obtain a graphite material for synthesizing semiconductor diamond, capable of manufacturing semiconductor diamond, which contains boron or a boron compound in a uniformly distributed state, at a high yield. SOLUTION: When semiconductor diamond containing boron is manufactured by a high pressure synthesizing method, boron or the boron compound is homogenously added to the graphite material to be converted into the semiconductor diamond and the whole is densified and highly purified to reduce hydrogen content.
Abstract:
PURPOSE: To obtain hard carbon optimum for a part material required of high hardness, e.g., cutting tools, digging tools or a sliding part material, further having electroconductivity. CONSTITUTION: This hard carbon is a mixture of an amorphous carbon and a diamond-resembled structure having >=2000kgf/mm Vickers hardness and 1×10 -1×10 Ω.cm electric resistance (at room temperature). This material is obtained by using a carbon cluster such as fullerenes as a raw material and using Al flux, as necessary, and using a belt cylinder-type high pressure machine or a piston cylinder-type high pressure machine at >=2.0GPa pressure and at 600-900 deg.C.