铝掺杂WC-Co基硬质合金的高温摩擦学性能、磨损机理及抗氧化性能研究  

Wear Mechanism, Tribological and Anti-Oxidation Properties of Al Doped WC-Co Hardmetals under High Temperature

作　　者：刘育林 朱圣宇[1] 于源[1,3] 程军 宋承立[1] 乔竹辉[1,2,3] 胡斌[1] LIU Yulin;ZHU Shengyu;YU Yuan;CHENG Jun;SONG Chengli;QIAO Zhuhui;HU Bin(Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Science,Beijing 100049,China;Qingdao Center of Resource Chemistry&New Materials,Shandong Qingdao 266000,China)

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院大学材料科学与光电工程中心,北京100049 [3]青岛资源化学与新材料研究中心,山东青岛266000

出　　处：《摩擦学学报》2019年第5期565-576,共12页Tribology

基　　金：国家重点研发计划(2018YFB2000100);国家自然科学基金(51775532);山东省泰山学者和青岛创新创业领军人才项目资助~~

摘　　要：通过高能球磨和电火花等离子烧结,成功制备了(x Al-WC)-6Co(x=0.2,0.33)三元复合材料,并研究了铝掺杂WC-Co基硬质合金在空气环境中500、600和700℃下的摩擦学性能.所制备的铝掺杂WC-Co,基体由WC和Co耦合而成,Al在烧结过程中发生氧化,基体上弥散分布细小的Cr3C2和Al2O3增强相.(0.2Al-WC-6Co)的硬度与断裂韧性明显高于WC-6Co,(0.33Al-WC)-6Co的断裂韧性较低.脆性钨类氧化物的形成是Al-WC-Co硬质合金高温磨损的主要原因.随着Al元素加入量的提高,硬质合金的高温抗软化性能和抗氧化性能提高,磨损表面的剥落和破碎行为减弱,材料的高温耐磨性能提高.Combining high energy ball milling and spark plasma sintering(SPS)technologies,(x%Al-WC)-6%Co(x=0.2 or 0.33,atomic fraction)ternary composites were successfully prepared.The tribological properties of Al doped WC-Co at 500,600 and 700℃in air environment were studied.The matrix of the prepared Al doped WC-Co was coupled by WC and Co,and Al oxidized during the sintering process.Numerous fine Cr3C2 and Al2O3,as hard phases,dispersed in the matrix.The hardness and fracture toughness of the(0.2 Al-WC-6Co)were higher than that of WC-6 Co.(0.33 AlWC)-6Co showed low fracture toughness.The formation of brittle tungsten oxides was the main reason of wear loss of Al-WC-Co at high temperature.With the increasing contents of Al,both the high temperature softening resistance and oxidation resistance of the Al-WC-Co were improved,and the spalling and breaking behaviors on the worn surface were reduced.The addition of Al could led to the improvement of the tribological properties of WC hard alloy.

关 键 词：铝掺杂WC-Co基硬质合金 高温 抗氧化性 摩擦学性能 

分 类 号：TH117.3[机械工程—机械设计及理论]