烧结温度对WC/TiC陶瓷刀具材料性能影响  

Effect of Sintering Temperature on Mechanical Properties of WC/TiC Ceramic Tool Material

作　　者：安晶[1] 吕明[1] AN Jing;LV Ming(College of Mechanical Engineering and Key Laboratory of Precision Manufacturing Taiyuan University of Technology, Shanx Taiyuan 030024, Chin)

机构地区：[1]太原理工大学机械工程学院及精密加工山西省重点实验室,山西太原030024

出　　处：《机械设计与制造》2018年第6期133-135,共3页Machinery Design & Manufacture

基　　金：国家自然科技基金项目(51405326;51575375);山西省高等学校科技创新项目(2014122)

摘　　要：采取压制素坯、真空热压烧结等技术制备出了WC/Ti C复合陶瓷刀具材料。通过对其维氏硬度、抗弯强度及断裂韧度的测量以及断口微观形貌的对比分析,研究了不同的烧结温度对该陶瓷刀具材料力学性能的影响。结果表明:随着烧结温度的升高,陶瓷刀具材料的维氏硬度呈现先下降后增加的趋势,于1600℃达到最大,其值为18.33GPa;随着烧结温度的升高,陶瓷刀具材料的抗弯强度呈现先降低后升高的趋势,于1750℃达到最大,其值为892.41MPa;随着烧结温度的升高,陶瓷刀具材料的断裂韧度呈现逐渐降低的趋势,于1600℃达到最大,其值为10.52MPa·m?。断口形貌观察发现:1600℃更有利于陶瓷刀具材料晶粒的生长并对材料结构的致密性最好;但随着晶粒生长速度的增加,材料中的孤立气孔被迅速生长的晶粒包围在内部,造成气孔不能正常排出,从而影响材料的力学性能。WC/Ti C ceramic cutting tool materialswere fabricated by pressing compact the vacuum hot-pressing sintering technology. The effects of sintering temperature on the mechanical properties of the ceramic tool materials were investigated by measuring the hardness,flexural strength and fracture toughness of Vivtorinox and the fracture morphology. Results show that with the increase of sintering temperature,the Vivtorinox hardness of ceramic tool material decreased firstly and then increased,reached the maximum at 1600℃ as it is 18.33 GPa;With the increase of sintering temperature,the bending strength of the ceramic tool material first decreased and then increased,reached the maximun at 1750℃ as it is 892.41 MPa;With the increase of sintering temperature,the fracture toughness of ceramic tool material decreased gradually. Reached the maximum at 1600℃ as it is 10.52 MPa·m. The fracture morphology shows 1600℃ is more conducive to the growth of ceramic tool materials and the best of the density of the structure of the material. However,with the increase of the grain growth rate,the isolated pores in the material are surrounded by the rapidly growing grain,which can not be discharged properly,so that the mechanical properties of the material can be affected.

关 键 词：陶瓷刀具 烧结温度 热压烧结 力学性能 微观形貌 

分 类 号：TH16[机械工程—机械制造及自动化] TB332[一般工业技术—材料科学与工程]