碳纳米管增强聚晶金刚石复合片的抗冲击韧性及其机制  

Impact Toughness and Mechanism of Polycrystalline Diamond Compacts Reinforced by Carbon Nanotubes

作　　者：段植元 汪冰峰[1,2] 崔刊[1] 刘岚逸 陈作林[1] 董婉冰 王晓燕[1] 褚新[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学有色金属材料教育部重点实验室,湖南长沙410083

出　　处：《矿冶工程》2015年第2期150-153,共4页Mining and Metallurgical Engineering

基　　金：湖南省自然科学基金重点项目(12JJ2028);中南大学大学生创新创业项目(LC13003)

摘　　要：利用自动落球冲击试验机测试了碳纳米管增强聚晶金刚石复合片材料的抗冲击韧性,采用扫描电子显微镜观测了复合片材料的冲击断口形貌。结果表明:碳纳米管弥散地分布在聚晶金刚石颗粒之间;在碳纳米管没有团聚的情况下,添加碳纳米管能显著增强复合片材料的抗冲击韧性;当添加碳纳米管的质量分数达到5%时,聚晶金刚石复合片的抗冲击韧性大约是不添加碳纳米管复合片的9倍。碳纳米管增强聚晶金刚石复合片材料的强韧化机理为:碳纳米管改善了聚晶金刚石颗粒间的结合方式,协调了变形以及阻碍了裂纹扩展。The impact toughness of polycrystalline diamond compacts reinforced by carbon nanotubes was investigated by automatic balls drop impact testing. The fracture morphology of the compacts was observed by scanned electron microscope （SEM）. The results of SEM indicate that carbon nanotubes are dispersed among polycrystalline diamond particles. In the case of no cluster of carbon nanotubes, the impact resistance toughness of the polycrystalline diamond compacts is increased significantly with the addition of carbon nanotubes. When the mass fraction of the added carbon nanotubes is about 5%, the impact toughness of the polycrystalline diamond compacts is approximately 9 times as much as that of the compacts without carbon nanotubes. The strengthening mechanism of the polycrystalline diamond compacts reinforced by carbon nanotubes is that the carbon nanotubes improve the intergranular bonding mode of polyerystalline diamonds, so as to coordinate the deformation and control the expansion of cracks.

关 键 词：聚晶金刚石复合片 碳纳米管 抗冲击韧性 增强机理 

分 类 号：TG501.1[金属学及工艺—金属切削加工及机床]