Polycrystalline diamond composites
阅读：861发布：2022-03-12
专利汇可以提供Polycrystalline diamond composites专利检索，专利查询，专利分析的服务。并且A polycrystalline diamond composite and method having diamond to diamond bonds formed between adjacent diamond particles. The composite is produced by mixing diamond particles with a sintering aid and creating direct diamond to diamond bonds under temperature and pressure conditions at which diamond is normally unstable.，下面是Polycrystalline diamond composites专利的具体信息内容。
1. A DIAMOND-NONDIAMOND CARBON POLYCRYSTALLINE COMPOSITE CONSISTING ESSENTIALLY OF 50-99* BY WEIGHT OF DIAMOND PARTICLES WHICH ARE SINTERED TO ADJACENT DIAMOND PARTICLES FORMING DIAMOND TO DIAMOND BONDS AND GRAPHITE AND SINTERING AID IN A COMBINED AMOUNT OF ABOUT 50-1% BY WEIGHT INTERSPERSED IN VOIDS BETWEEN THE SINTERED DIAMOND PARTICLES THE NONDIAMOND CARBON REVERTING FROM DIAMOND CARBON BY EXPOSING THE DIAMOND CARBON TO TEMPERATURE AND PRESSURE CONDITIONS IN WHICH DIAMOND IS UBSTABLE.
2. A polycrystalline diamond composite as defined in claim 1 wherein said sintering aid comprises at least one element selected from the group consisting of aluminum, beryllium, boron, hafnium, magnesium, molybdenum, niobium, nitrogen, rhenium, sIlicon, titanium, tungsten, vanadium, and zirconium.
3. A polycrystalline diamond composite as defined in claim 1 wherein said sintering aid comprises at least one refractory selected from the group consisting of refractory borides, carbides, nitrides, oxides and silicides.
4. A method for making a diamond-nondiamond carbon polycrystalline composite consisting essentially of 50-99% by weight of diamond and 50-1% by weight of graphite and sintering aid which comprises sintering together initially distinct diamond particles by subjecting a mixture of diamond particles and sintering aid to 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% by weight.
5. A method as defined in claim 4 wherein said sintering aid comprises at least one element selected from the group consisting of aluminum, beryllium, boron, hafnium, magnesium, molybdenum, niobium, nitrogen, rhenium, silicon, titanium, tungsten, vanadium, and zirconium.
6. A method as defined in claim 4 wherein said sintering aid comprises at least one refractory selected from the group consisting of refractory borides, carbides nitrides, oxides, and silicides.
7. A method for making a diamond-nondiamond carbon polycrystalline compact which comprises heating initially distinct diamond particles and at least one sintering aid under a pressure between about five 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 from1% to 50% of the diamond is converted to nondiamond carbon.
8. A method of bonding diamond to diamond to form a polycrystalline diamond composite comprising the steps of: forming an intimate mixture of diamond particles and a sintering aid; subjecting the mixture to temperature and pressure conditions in which diamond is unstable until a unitary composite of predetermined configuration is formed, said unitary composite comprising direct diamond to diamond bonds uniting diamond particles, voids therebetween being filled with graphite and sintering aid.
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