摘要
三元硼化物因其具有高硬度、低密度、高耐磨性、高耐腐蚀性等特征被广泛应用在耐磨、耐腐蚀领域,但是其综合力学性能与WC-Co硬质合金相比仍有差距。本文研究添加第二相TiB_(2)颗粒对1300℃烧结原位反应MoCoB-Co金属陶瓷微观组织及力学性能的影响。结果表明:添加TiB_(2)后原位合成的MoCoB和TiB_(2)晶粒构成MoCoB-Co金属陶瓷的双硬质相,MoCoB晶粒得到明显细化,MoCoB呈现等轴状与棒状两种形貌;随着TiB_(2)含量的增加,MoCoB/Co的含量比逐步增加,等轴状MoCoB的尺寸基本保持为1~2μm,棒状MoCoB在添加15%~20%质量分数的TiB_(2)时略有长大,短轴增加较明显。TiB_(2)作为第二硬质相增强基体,硬度明显提高,当TiB_(2)质量分数为15%时硬度为HRA 88.9,较未添加时提高约6%。
Ternary borides have been widely used due to high hardness,low density,high wear resistance and high corrosion resistance.However,the ternary borides based cermets have lower mechanical properties when compared with WC-Co cemented carbide.The effects of TiB_(2) particle additions on microstructure and mechanical properties of MoCoB-Co cermets sintered at 1300℃were investigated.The in-situ MoCoB and TiB_(2) are the double hard phases of MoCoB-Co cermet.The MoCoB grains,which exhibitboth equiaxed and rod morphologies,are obviously refined.The ratio of MoCoB/Co gradually increases with the increase of TiB_(2) content,but the grain size of equiaxed MoCoB remains 1~2μm.When the content of TiB_(2) is 15%~20%(mass fraction,the samebelow),the rod MoCoB grows and the minoraxisincreases significantly.The hardness of the cermet is improved with TiB_(2) addition.When the TiB_(2) content is 15%,the hardness reaches HRA 88.9,which is about 6%higher than that without addition.
作者
杨欣
尹海清
汤益纯
徐斌
张聪
张瑞杰
王永伟
姜雪
杨国强
曲选辉
Yang Xin;YinHaiqing;Tang Yichun;Xu Bin;Zhang Cong;Zhang Ruijie;Wang Yongwei;Jiang Xue;Yang Guoqiang;Qu Xuanhui(Institute of Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Beijing Advanced Innovation Center for Materials Genome Engineering,Beijing 100083,China;Mechanical and Equipment Engineering,Hebei University of Engineering,Handan Hebei 056038,China;Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《硬质合金》
CAS
2021年第5期307-316,共10页
Cemented Carbides
基金
北京市自然科学基金项目《MoCoB-Co金属陶瓷的过渡金属掺杂与界面协同调控机制研究》(2212042)
国家重点研发计划课题《材料数据标准规范研究》(2020YFB0704504)。
