Structure,tribological properties,and the growth mechanism of in-situ generated TiC in titanium cermet  

作　　者：Xiaolei SUN Yong LUO Junyang WANG Qingliang WANG Jianghao QIAO Andrew BEADLING Michael BRYANT Zhongmin JIN 

机构地区：[1]School of Chemical Engineering&Technolog,China Universiy of Mining and Technology,Xuzhou 221116 China [2]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]School of Mechanical Engineering,Soutnwest Jiaotong Universit,Chengdu 610031,China [4]School of Materials Science and Physics,China University of Mining and Technologw Xiczhou 21116,China's [5]School of Mechanical Engineering,University of Leeds,Leeds LS29JT,UK [6]State Key Laboratory of Tribology,Tsinghua University,Bejing 100084,China

出　　处：《Friction》2022年第5期706-716,共11页摩擦（英文版）

基　　金：This work was supported by National Natural Science Foundation of China(Nos.51875563,51575514,and 51911530200);the Tribology Science Fund of State Key Laboratory of Tribology(No.SKLTKF19A03).

摘　　要：Titanium cermet combining metallic toughness with ceramic wear resistance has been proven to be a potential candidate for implanted joint material.In this work,titanium cermet was synthesized by means of the elevated temperature solid carburizing technology.The Ti_(13)Nb_(13)Zr alloy surface was found to be converted into TiC ceramic layer combined with a carbon strengthened diffusion zone underneath.The overall thickness of the carburized region grew to about 100 um after 120 min carburization at 1,500 K.In order to clarify the growth behaviors of TiC ceramic layer,a growth mechanism is proposed.At the beginning of carburizing process,carbonaceous gas decomposed from carburizer due to high temperature and then converted to free atomic carbons through reduction reaction.Then,in-situ generated TiC ceramic layer possessing certain thickness formed on the surface,meanwhile,the inner carbon diffusion zone also grew inwards due to physical diffusion of carbon,and finally forming a gradient carbon distribution.In addition,the tribological behaviors of the new materials were evaluated through reciprocating ball-on-plate sliding wear tests in bovine calf serum.Although there was an increase in friction coefficient,the wear rate decreased by 59.6%due to the formation of the wear-resistant TiC ceramic layer.The wear mechanisms evolved from severe abrasive wear for bare Ti_(13)Nb_(13)Zr alloy to mild adhesive wear for titanium cermet.

关 键 词：titanium cermet growth mechanism wear mechanism 

分 类 号：TH117[机械工程—机械设计及理论]