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Effects of initial crystal size of diamond powder on surface residual stress and morphology in polycrystalline diamond (PCD) layer
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作者 JIA HongSheng JIA XiaoPeng +3 位作者 XU Yue WAN LianRu jie kaikai MA HongAn 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第1期98-101,共4页
Polycrystalline diamond compacts (PDC) were synthesized using diamond powder of average crystal size 3-20 μm by the Ni 70 Mn 25 Co 5 alloy infiltration technique at high temperature and high pressure (HPHT).The surfa... Polycrystalline diamond compacts (PDC) were synthesized using diamond powder of average crystal size 3-20 μm by the Ni 70 Mn 25 Co 5 alloy infiltration technique at high temperature and high pressure (HPHT).The surface residual stress of polycrystalline diamond (PCD) layer was measured using micro-Raman spectroscopy with hydrostatic stress model and X-ray diffraction (XRD).Measurements of the stress levels of PCDs show that the residual compressive stresses range from 0.12 to 0.22 GPa,which increase with the crystal size of diamond.Scanning electron microscopy (SEM) was used to observe the morphology of initial diamond grains and PCD cross-section.The results indicate that PCD has a dense and interlaced microstructure with diamond-diamond (D-D) direct bonding.And the smaller the crystal size of diamond,the better the growth of diamond direct bonding and the smaller the binder metal between diamond boundaries will be. 展开更多
关键词 HPHT polycrystalline diamond (PCD) crystal size residual stress MORPHOLOGY
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