Diamond-nondiamond carbon polycrystalline composites
阅读：395发布：2022-03-16
专利汇可以提供Diamond-nondiamond carbon polycrystalline composites专利检索，专利查询，专利分析的服务。并且Diamond-nondiamond carbon polycrystalline composites particularly useful as abrasives are made by sintering diamond particles at temperatures above about 1440*K but at pressures below which diamond is stable or metastable with respect to its conversion to graphite.，下面是Diamond-nondiamond carbon polycrystalline composites专利的具体信息内容。
2. A method for making a diamond-nondiamond carbon polycrystalline composite consisting essentially of 50-99 percent by weight of diamond and 50-1 percent by weight of nondiamond carbon which comprises sintering together initially distinct diamond particles at a condition of pressure and temperature in which the diamond is simultaneously (a) thermodynamically unstable with respect to graphite and (b) capable of sintering and for a time increment less than that resulting in conversion of the diamond in the polycrystalline composite to below 50 percent by weight.
3. A method for making a diamond-nondiamond carbon polycrystalline compact which comprises heating initially distinct diamond particles under a pressure between about 5 kilobars and about 100 kilobars and at a temperature at which diamond is thermodynamically unstable under such pressure with resPect to conversion to graphite until from 1 to 50 percent of the diamond is converted to nondiamond carbon.
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