Si_3N_4-TiC_(0.5)N_(0.5)复相陶瓷的制备及切削性能研究  

Preparation and Cutting Performance of Si_3N_4-TiC_(0.5)N_(0.5) Composite Ceramics

作　　者：古尚贤 郭伟明[1] 曾俊杰[1] 伍尚华[1] 蒋强国[1] 高棱[1] 

机构地区：[1]广东工业大学机电工程学院,广州510006

出　　处：《人工晶体学报》2015年第5期1259-1265,共7页Journal of Synthetic Crystals

基　　金：广东省引进领军人才专项资金(400120001);广东省教育厅学科建设(501120021)

摘　　要：以TiC0.5N0.5粉为导电第二相,利用热压烧结制备了Si3N4-TiC0.5N0.5复相陶瓷。研究了不同含量TiC0.5N0.5对Si3N4陶瓷相组成、致密度、显微结构、力学性能、导电性能、切削性能及磨损机理的影响。结果表明:高温下TiC0.5N0.5与Si3N4具有良好稳定性,烧结后获得致密的Si3N4-TiC0.5N0.5复相陶瓷;导电第二相的增加可以明显改善氮化硅陶瓷的电学性能,并且有助于提高Si3N4-TiC0.5N0.5复相陶瓷的硬度和断裂韧性,但不利于Si3N4-TiC0.5N0.5复相陶瓷的抗弯强度;当含量超过25vol%时,硬度增幅变缓,断裂韧性下降;在高速切削过程中,随着切削时间增加,后刀面磨损增大,刀具切削温度增加;STCN20切削性能最好,当TiC0.5N0.5含量超过20vol%时会加剧刀具的磨损;Si3N4-TiC0.5N0.5复相陶瓷刀具的磨损机制主要是机械摩擦导致的磨粒磨损,并伴随少量的粘结磨损。Si3N4-TiC0.5N0.5 composite ceramics were prepared by hot pressing using Ti C0. 5N0. 5powders as second phase. The phase composition,densification,microstructure,mechanical properties,electrical conductivity,cutting performance and wear mechanism were investigated with different TiC0.5N0. powders content. The results show that dense Si3N4-Ti C0. 5N0. 5can be obtained after hot pressing,due to the good stability between Si3N4 and Ti C0. 5N0. 5at high temperature. By increasing content of the conductive second phase,the electrical properties of Si3N4 ceramics are obviously improved,and the hardness and fracture toughness are also improvd,but the flexural strength decreases; when the content of Ti C0. 5N0. 5is more than 25vol%,hardness increases slowly and fracture toughness decreases; in the process of high speed cutting,frank wear and cutting temperature increase with the increasing cutting time; the cutting performance of STCN20 is best; when Ti C0. 5N0. 5content is more than 20vol%,tool wear will be aggravated; the main wear mechanism of Si3N4-Ti C0. 5N0. 5composite ceramic cutting tool is mechanical friction caused by abrasive wear,and associated with a small amount of adhesive wear.

关 键 词：Si3N4-TiC0.5N0.5 电阻率 陶瓷刀具 切削性能 磨损机理 

分 类 号：TB332[一般工业技术—材料科学与工程]