SPS烧结压力对60NiTi合金显微组织及摩擦学性能的影响  

Effects of SPS Sintering Pressure on Microstructure and Tribological Properties of 60NiTi Alloy

作　　者：王伟[1] 孙壮 程鹏 王成[1] 高原 邹德宁[1] 王快社[1] Wang Wei;Sun Zhuang;Cheng Peng;Wang Cheng;Gao Yuan;Zou Dening;Wang Kuaishe(College of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《稀有金属材料与工程》2022年第10期3793-3801,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51975450);山西省科技重大专项(20191102006)。

摘　　要：采用放电等离子烧结(SPS)法在1000℃制备60NiTi合金,研究烧结压力对60NiTi合金的显微组织、显微硬度和摩擦学性能的影响规律;采用X射线衍射仪、扫描电镜分析60NiTi合金的显微组织,采用显微硬度仪评价60NiTi合金的显微硬度,通过摩擦磨损试验机研究60NiTi合金摩擦学性能,利用三维白光轮廓仪分析磨痕形貌并计算60NiTi合金的磨损体积,采用扫描电子显微镜分析磨痕表面形貌。实验结果表明:在25 MPa烧结压力下,通过放电等离子烧结法制备的60NiTi合金显微组织均匀,主要为Ni_(3)Ti相和Ni3Ti相。随着烧结压力增加,60NiTi合金的显微硬度随之增加,且在50 MPa烧结压力时合金的显微硬度HV_(0.2kg)达到最大值5233.2 MPa。60NiTi合金的磨损率和磨痕深度随着烧结压力的增加而减小,在50 MPa烧结压力时,60NiTi合金的磨损率和磨痕深度最小,分别为0.76×10^(-5)mm^(3)/(N·m)、15μm,其磨损机制为磨粒磨损与黏着磨损共同作用机制。60NiTi alloys were fabricated by spark plasma sintering(SPS)at 1000°C.The effects of the sintering pressure on the microstructure,microhardness and tribological properties of 60NiTi alloys were investigated.The phase structures and micros tructures of 60NiTi alloys were analyzed by X-ray diffractometer(XRD)and scanning electron microscopy(SEM).The microhardness and tribological properties of 60NiTi alloys at different sintering pressures were evaluated by microhardness tester and ball-on-disk wear tester.The wear morphologies of 60NiTi alloys were analyzed by SEM with energy disperse spectroscopy(EDS)and three-dimensional white light profilometer,and the wear volumes were calculated.The experimental results show that the microstructures of 60NiTi alloy prepared by SPS is uniform and the NiTi phase and NiTi phase are presented in the microstructures.The microhardness of 60NiTi alloys increases with the increase of the sintering pressure.The microhardness of 60NiTi alloys has the biggest HV0.2kg value of 5233.2 MPa at the sintering pressure of 50 MPa.The wear rate and wear scar depth of 60NiTi alloys decrease as the sintering pressure increase s.However,when the sintering pressure reaches to 50 MPa,the wear rate and wear scar depth of 60NiTi alloys are the smallest,which are 0.76×10mm~3/(N·m)and 15μm,respectively.The wear mechanisms of 60NiTi alloys are abrasive wear and adhesive wear.

关 键 词：60NiTi合金 放电等离子烧结 显微组织 显微硬度 摩擦学性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]