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Shao J.-R.,Zhengzhou Sino Crystal Diamond Co. | Zhao Q.-G.,Zhengzhou Sino Crystal Diamond Co. | Kang X.-T.,No 2 Institute Of Geological Mineral Resources Survey Of Henan | Li H.-P.,CAS Zhengzhou Research Institute | And 2 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2014

Three kinds of screens of different manufacturers were used on the screening conducted comparative tests between the same particle size of diamond abrasives according to the standard screening method in this test. The result shows that, the mesh size and wire diameter size have a greater difference between the screens with the same specifications and different manufacturers. Such a difference has seriously affected the unity and stability of the screening results. In order to ensure the stability and unity of the diamond abrasive screening results, we should first choose a qualified screen, followed by the study of grain size of screening results correction method. ©, 2014, Zhengzhou Institute of Abrasives Grinding. All right reserved.

Zhang X.,Peking University | Chuan X.,Peking University | Lin Y.,Zhengzhou Sino Crystal Diamond Co. | Shen B.,Hubei Changli Diamond Products Co.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2010

Natural graphite is one of the most important raw materials in diamond synthesis. Resides striet requirmenl on the degree of gruphilization and particle size of the graphite as well as the ash content which should be extra-low, variety and state of impurities are eritieal influencing factors upon diamond quality. With optical microscope, X-ray powder diffraction, Environmental Scanning Electron Microscopy, Energy Dispersive X-ray Detector and high frequency IR carbon sulfur analyzer, graphite ore, high purity graphite and diamond synthesized from the high purity graphite were analyzed. The properties of graphite used as carbon source in diamond synthesis were discussed in the present paper. We suggest that performance of synthetic diamond was dependant on the purity, particle size and impurity of natural graphite.

Mao H.-T.,Zhengzhou Sino Crystal Diamond Co. | Xue S.-H.,Zhengzhou Sino Crystal Diamond Co. | Ding Q.-C.,Zhengzhou Sino Crystal Diamond Co. | Wang R.-R.,Zhengzhou Sino Crystal Diamond Co. | Shao J.-R.,Zhengzhou Sino Crystal Diamond Co.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2013

Comparison trials were carried out on the cubic press, using powder synthesis rods in φ49 mm cavity by indirect heated normal assemble method and internal carbon assemble method. Results indicate that the internal carbon assemble method for diamond synthesis can ensure sufficient and even carbon source to the periphery of the synthesis rods for diamond growing. This obviously improve the rate of better diamond crystal and make the diamond have good crystal shape and less internal impurity. Compared with the common assemble method, this method can improve the yield of high quality diamond by 6.5%.

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