Synthetic diamond main properties of graphite

First synthetic diamond after quite a long time, there is no specific guidance carbon source selection theory. Until 1973 Professor Gou Qingquan uses three high graphite (high graphitization degree, high density, high purity) as a synthetic diamond with a carbon source, the diamond industry have a choice theory. But this is only considered based on graphite carbon properties, cutting tools other properties of graphite. With further research, industry experts and scholars in the theory mentioned by Mr. Gou Qingquan, based on synthetic diamond graphite Abrasive grinding wheel was further elucidation, in full consideration of its carbon source characteristics, based on their physical and chemical properties, mechanical properties were discussed in detail and studies [6,9,10 ~ 12,15,16,19 ~ 33]. With the development of the diamond industry, synthetic diamond graphite increasingly rich variety. Uniform synthetic diamond quality of the product, and the former Ministry of Machinery Industry Department of Electrical and promulgated a standard synthetic diamond graphite (JB3143-82), synthetic diamond graphite product quality grading standards (JB/DQ7258-87) and synthetic diamond graphite piece national Standards (GB/T14898-94). In the synthetic diamond graphite product quality grading standards, according to the product of the three static performance indicators (degree of graphitization level of open porosity size, ash content) were divided into qualified products, first-class products and quality product. In the synthetic diamond graphite sheet standards for product performance, test methods and sampling methods, etc. are adopted international standards or advanced foreign standards (eg: France Roland's EG34D products measured value). Table 2 as the national standard for several physical and chemical properties of synthetic diamond graphite provisions. These standards prescribed physical and chemical properties, both considered the function of graphite as a carbon source, but also give full consideration to its heat and pressure media functions.