Abstract On November 21st, 2014, Zhongnan Diamond Co., Ltd. and its subsidiary, Zhengzhou Zhongnan Jiete Superhard Materials Co., Ltd., were responsible for “high-toughness precision processing CBN polycrystalline composite sheet†and “millimeter cubic boron nitride largeâ€. The development of single crystal" two results identification will be in Zheng...
On November 21, 2014, Zhongnan Diamond Co., Ltd. and its subsidiary, Zhengzhou Zhongnan Jiete Superhard Materials Co., Ltd., were responsible for “high-toughness precision processing CBN polycrystalline composite sheet†and “millimeter cubic boron nitride large sheetâ€. The development of the crystals was held in Zhengzhou City. The leaders of the departments and bureaus of Henan Provincial Science and Technology Department, Zhengzhou Science and Technology Bureau and Nanyang Science and Technology Bureau attended and presided over the meeting. The appraisal committee consists of 7 experts and professors from Zhengzhou University, Zhengzhou Institute of Aeronautical Industry Management, and Zhengzhou Abrasives Grinding Research Institute. 
The two research projects were completed by Lu Canhua, the chief expert of the Weapons Group, and Zhang Xiangfa, the technology leader of the Weapons Group. "CBN polycrystalline composite sheet for high toughness precision processing" has high wear resistance and high impact toughness characteristics. The standard props manufactured by the project have high processing precision and obvious economic and social benefits; "Millimeter cubic nitriding The development of large boron single crystals is necessary for the production of single crystal knives, research on CBN heat, electricity, light and preparation of heat sinks, high temperatures and special optical devices. Therefore, the development of millimeter-scale large single crystals is of great significance.
The appraisal committee heard the report of the project team, reviewed the relevant appraisal materials, and reviewed the product samples. After questioning and discussion, the expert committee unanimously approved the results. The appraisal believes that the results of the two projects have reached the domestic leading level and the international advanced level.
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