碳化硅-金刚石超硬复合材料的弹性性质  

Elastic Property of SiC-Diamond Composite under Hydrostatic Pressure

作　　者：王志刚[1] 徐亮[1] 李绪海[1] 王海阔[2] 贺端威[3] 孟川民[1] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,四川绵阳621999 [2]河南工业大学材料科学与工程学院,河南郑州450001 [3]四川大学原子与分子物理研究所,四川成都610065

出　　处：《高压物理学报》2015年第4期263-267,共5页Chinese Journal of High Pressure Physics

基　　金：冲击波物理与爆轰物理重点实验室专项(2012-专-02;2012-专-13)

摘　　要：在六面顶压机装置上,采用完全静水压声速测量技术,同时测量了碳化硅-金刚石复合材料在0~4.3GPa压力范围内的纵波声速（vp）和横波声速（vs）,获得了其弹性模量与压力的关系。研究发现：当压力小于1.4GPa时,由于材料内部微孔隙闭合,材料声速随压力的升高而增大;随着压力的继续增加,微孔隙闭合完毕,声速趋于稳定值。常压下,碳化硅-金刚石复合材料的剪切模量高于体积模量;而高压下微孔隙对纵波声速的影响明显大于横波声速,导致体积模量在约1.4GPa时超过剪切模量。在1.4~4.3GPa压力下,碳化硅-金刚石复合材料的体积模量和剪切模量分别约为360和350GPa。The longitudinal and shear sound velocities （vp and vs） of SiC-diamond composite under hydrostatic pressure were measured simultaneously in a multi-anvil apparatus, and the relationship between modulus and pressure was also obtained, vp and vs increase with increasing pressure in the pressure range of 0 to 1.4 GPa and keep stable at higher pressure. The variations of sound velocities are attributed to the closing procession of micro voids and cracks during compression. The bulk modu- lus of SiC-diamond composite is higher than the shear modulus at ambient pressure, whereas the bulk modulus increases faster than the shear modulus with increasing pressure and exceeds the shear modu- lus at 1.4 GPa. In the pressure range of 1.4 to 4.3 GPa,the bulk and shear modulus of SiC-diamond composite are about 360 and 350 GPa,respectively.

关 键 词：碳化硅-金刚石复合材料 静水压 声速 弹性性质 

分 类 号：O521.2[理学—高压高温物理]