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Hebei Plasma Diamond; Technology Co. | Date: 2013-07-09

Pearls made of ambroid (pressed amber); amulets; diamonds; jewellery; paste jewellery; works of art of precious metal; tie pins; synthetic diamonds; laser cut synthetic gems; wristwatches.

Wang Z.-N.,Hebei Institute of Laser | Wang Z.-N.,Hebei Plasma Diamond Technology Co. | Li G.-H.,Hebei Institute of Laser | Li G.-H.,Hebei Plasma Diamond Technology Co. | And 5 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2011

Diamond films were deposited on Si substrate by plasma jet. The influence of size and pretreatment method of silicon wafer, as well as diamond film deposition and heat treatment on the characteristics and crack of composite substrate were investigated. The fabrication processes for the diamond film/Si composite substrates was optimized.The results showed that: the thickness of diamond film deposited on Si substrate was more than 20 μm. After polishing, the surface roughness(R a) of diamond film reached 5.2 nm. The thickness of residual diamond film was more than 10 μm, and the flatness was less than 30 μm. The indexes of composite substrates met technical requirements of electronic components. Source

Luo T.,Hebei Institute of Laser | Luo T.,Hebei Plasma Diamond Technology Co. | Cai Y.,Hebei Institute of Laser | Cai Y.,Hebei Plasma Diamond Technology Co. | And 6 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2015

In order to improve the transparence of diamond films and the stability of technical parameters, the black defects of diamond films prepared with DC Arc Plasma Jet CVD method were investigated. The black defects after observation, analysis, measurement and comparison using several kinds of optical microscopes were classified into punctiform, massive, texture and lamellar defects. The punctiform black defects were produced by masking and scattering of light caused by granular metal impurity, carbon mass, cavity and penetrating twins in diamond films. The massive and stripped defects were produced by reflection and scattering of light caused by changes of surface angle and orientation between the crystal columns. The texture defects were produced by the stress in the diamond films. The lamellar defects were produced by absorption of light caused by conductive elements at different horizons of diamond films. The lamellar defects were the main light-blocked defects of diamond films because the existence of lamellar defects severely influenced the improvement and stability of transparence, abrasion ratio, thermal conductivity and three-point bending fracture strength of diamond films. Some ways to solve the black defects had been put forward. ©, 2015, Zhengzhou Institute of Abrasives Grinding. All right reserved. Source

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