人造金刚石的晶粒性质及其相互关系的研究

Research on the Crystal Characteristics of Synthetic Diamond and Its Relative Factors

金刚石颗粒的性质包括粒度、形貌、包裹体、冲击强度、抗压强度、热稳定性等 ,这些性质决定了金刚石工具最终的使用性能。本研究用 9种GE公司的金刚石为样品 ,对金刚石的上述性质进行了系统的测量 ,考察了诸性质之间的相互关系。我们的测量结果表明 :金刚石的机械性质与晶粒的形貌以及晶体内部的杂质含量等性质之间存在着重要的相互关系 ;在同种晶粒粒度条件下 ,随着品级的升高 ,机械性质冲击强度、热稳定性逐渐升高 ;在晶体形貌方面如等轴度、粗糙度、椭圆度、晶粒度、浑圆度也随品质的升高逐渐改善 ;磁化物含量越低 ,金刚石的抗压强度。

The characteristics of diamond particles,including size,shape,inclusion amount,impact strength,single particle fracture and thermal stability,determine their behavior in practical applications.The interrelationship of these characreristics is discussed through analysing nine different kinds of GE company's diamond particles.The results showed that the mechanical properties of diamond depend strongly on its shape,impurity amount of the crystals and other facrors.With the same size,the mechanical properties of diamond such as impact strength,single partical strength and thermal stability increase with the rise of the grade of diamond,the shape of crystals(elongation,roundness,ellipticity,crystallinity,roughness)will also improved.In addition,the lower the content of magnetic substances in grits,the better the qualitiy of grits.