摘要
以立方氮化硼(cBN)、TiN、铝为原料,在1500℃,5.5 GPa条件下烧结合成聚晶立方氮化硼(PcBN)复合材料,研究了TiN-Al体系结合剂中TiN与铝的质量配比(21:4,17:8,13:12,9:16)对PcBN复合材料物相组成、微观结构、硬度和耐磨性能的影响。结果表明:PcBN复合材料主要由BN、TiB_(2)、TiN、AlN和Al_(2)O_(3)相组成;随着结合剂中铝含量的升高,PcBN复合材料结构变得致密,气孔率降低,硬度呈先升高后降低的趋势,磨耗比先增大后减小。当TiN与铝质量配比为17:8时,复合材料的综合性能最佳,硬度与磨耗比最高,分别为35.8 GPa和7500,气孔率较低,为0.83%。
Taking cubic boron nitride(cBN),TiN,and aluminum as raw materials,polycrystalline cubic boron nitride(PcBN)composites by sintering at 1500℃and 5.5 GPa.The effect of the mass ratio(21:4,17:8,13:12,9:16)of TiN to Al in the TiN-Al system binder on the phase composition,microstructure,hardness and wear resistance of PcBN composites was studied.The results show that PcBN composite was mainly composed of BN,TiB_(2),TiN,AlN and Al_(2)O_(3) phases.With increasing the aluminum content in the binder,the structure of PcBN composite became denser,and the porosity decreased;the hardness and wear ratio first increased and then decreased.When the mass ratio of TiN to Al was 17:8,the comprehensive property was the best with the largest hardness and wear ratio of 35.8 GPa and 7500,respectively,and the relatively small porosity of 0.83%.
作者
罗涛
江文清
徐敏
LUO Tao;JIANG Wenqing;XU Min(College of Mechanical Engineering,Jiujiang Vocational and Technical College,Jiujiang 332007,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2021年第11期34-37,共4页
Materials For Mechanical Engineering
