摘要
采用放电等离子烧结(SPS)法在1200℃制备含有不同质量分数TiB_(2)的Ti_(2)AlNb基复合材料,使用显微硬度仪研究不同TiB_(2)含量的复合材料显微硬度变化规律,通过摩擦磨损试验机测试复合材料的摩擦系数,采用三维白光轮廓仪扫描磨痕形貌并计算复合材料的磨损体积和磨损率。结果表明:通过球磨和SPS制备的复合材料组织均匀,烧结过程中TiB_(2)与Ti_(2)AlNb原位反应生成TiB,过量的TiB二次反应原位生成TiB_(2)相。本实验中,随TiB2含量的增加,材料的显微硬度随之增加,且在TiB2添加量为20%(质量分数)时材料的显微硬度达到最高值HV 1446.3。复合材料的摩擦系数和磨损率均随TiB2添加量的增加先减小后增大,摩擦磨损时原位生成的TiB相起到减摩作用,原位生成的TiB2相起耐磨骨架作用。在TiB2含量为10%时复合材料的摩擦磨损性能最优,此时摩擦系数为0.554,磨损率为3.363×10^(-4)mm^(3)·N^(-1)·m^(-1)。复合材料的磨损机制为磨粒磨损和轻微黏着磨损共同作用。
Ti_(2)AlNb-based composites with different mass fractions of TiB_(2)were prepared by spark plasma sintering(SPS)method at 1200℃.The microhardness of the composites with different TiB_(2)contents was studied by microhardness tester.The coefficient of fric⁃tion of the composites was investigated by friction and wear tester.The wear trace morphology was scanned by three-dimensional white light scanner and the wear volume and wear rate of the composites were calculated.The results showed that the microstructure of com⁃posites prepared by ball milling and SPS was uniform.In the sintering process,TiB_(2)and Ti_(2)AlNb reacted in situ to generate TiB,and excessive TiB reacted in situ to generate TiB_(2)phase.In this experiment,the microhardness of the material increased with the increase of TiB2 content,and the microhardness of the material reached the highest value of HV 1446.3 when the addition amount of TiB_(2)was 20%(mass fraction).The friction coefficient and wear rate of composite materials first decreased and then increased with the increase of the addition amount of TiB_(2).The TiB phase generated in situ played a role of antifriction,while the TiB2 phase generated in situ played a role of wear skeleton.When the content of TiB_(2)was 10%,the friction and wear performance of the composite was the best.At this time,the friction coefficient was 0.554 and the wear rate was 3.363×10^(-4)mm^(3)·N^(-1)·m^(-1).The wear mechanism of composites was the combination of abrasive wear and slight adhesive wear.
作者
王伟
韩子茹
王庆娟
周海雄
高原
王快社
Wang Wei;Han Ziru;Wang Qingjuan;Zhou Haixiong;Gao Yuan;Wang Kuaishe(College of Metallurgy Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2020年第12期1255-1263,共9页
Chinese Journal of Rare Metals
基金
国家自然科学基金青年基金项目(51605249)
凝固技术国家重点实验室(西北工业大学)开放课题(SKLSP201828)资助。
