微波烧结原位合成TiC增强钛复合材料的性能  

Properties of TiC Reinforced Ti-Composites Synthesized in Situ by Microwave Sintering

作　　者：胡满银 欧阳德来[1] 崔霞[1] 杜海明[2] 徐勇[1] HU Manying;OUYANG Delai;CUI Xia;DU Haiming;XU Yong(School of Materials Science and Engineering,Nanchang Hangkong University,Jiangxi 330063,China;Jiangxi Normal University,Jiangxi 330022,China)

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063 [2]江西师范大学,南昌330022

出　　处：《材料研究学报》2021年第4期277-283,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51761029,51864035)。

摘　　要：以纳米管(MWCNTs)和纯钛为原料,用微波烧结法原位合成TiC增强钛基复合材料,研究了这种材料的组织和性能并探讨了Ti C增强相的生成机理。结果表明,微波烧结时MWCNTs与Ti原位生成TiC增强相。MWCNTs的添加量(质量分数,下同)低于1%时TiC呈现颗粒状且分布均匀,Ti基体致密;MWCNTs的添加量高于1.5%时TiC呈树枝晶形貌,Ti基体的组织粗化使复合材料出现较多的孔洞。MWCNTs的添加使材料由粘着磨损为主转变为磨粒磨损为主。随着MWCNTs添加量的提高,复合材料的显微硬度先提高后降低。MWCNTs添加量为1%的复合材料显微硬度最高(约为527HV)、耐磨性能最好(摩擦系数约为0.35)。与纯钛相比,TiC增强钛基复合材料的显微硬度提高了1.2倍,摩擦系数降低了0.4。Novel TiC reinforced Ti-based composites were synthesized via in situ microwave sintering with nanotubes(MWCNTs)and pure Ti as raw materials.The properties of the composites were investigated,and the formation mechanism of Ti C reinforced phase of the composites was discussed.The results show that TiC reinforced phase could be generated in-situ in the Ti-matrix during microwave sintering.When the addition amount of MWCNTs<1%(in mass fraction),the formed TiC was granular-like and distributed uniformly in the dense Ti matrix of fine grains.When the addition amount of MWCNTs>1.5%,the formed TiC turns to be of dendritic morphology,while the Ti matrix is coarsened and the composite becomes porous.Sequentially,the wear mechanism of the composites will change from adhesive wear to abrasive wear due to the addition of MWCNTs.With the increasing addition amount of MWCNTs the microhardness of the composite increases firstly and then decreases.When the addition amount of MWCNTs is 1%,the acquired composite presents a higher microhardness of about 527 HV and better wear resistance with the friction coefficient of about 0.35,which are 1.2 times more and 0.4 less than the corresponding terms of the pure Ti respectively.

关 键 词：复合材料 微波烧结 TIC 原位合成 TiC增强钛基复合材料 

分 类 号：TG146[一般工业技术—材料科学与工程]