放电等离子烧结参数对TiC/Fe复合材料密度和硬度的影响  

EFFECTS OF SINTERING PARAMETERS ON TiC/Fe COMPOSITES PRODUCED BY SPARK PLASMA SINTERING

作　　者：何林[1] 刘颖[1] 李兵红[1] 曹卉[1] 李军[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《粉末冶金工业》2010年第4期33-37,共5页Powder Metallurgy Industry

摘　　要：采用放电等离子烧结技术(SPS)原位合成了TiC颗粒增强铁基复合材料。利用X射线衍射(XRD)、扫描电镜(SEM)及洛氏硬度计等分析测试手段,研究了烧结温度、保温时间和烧结压力对材料微观结构、密度和硬度的影响。研究结果表明,随着烧结温度的升高,复合材料的密度和硬度先增大后减小,并于1 150℃时取得最大值;随着保温时间的延长,增强颗粒TiC的尺寸增大;复合材料的密度和硬度随保温时间延长呈现先增加后减小的趋势,在保温时间为5 min时取得最大值;复合材料的密度和硬度随烧结压力的变化具有与保温时间相似的规律,压力为40 MPa时,密度和硬度取得最大值。TiC reinforced Fe matrix composites were in-situ synthesized by spark plasma sintering（SPS） technique.The influences of temperature,holding time and pressure on the microstructure,density and hardness of the composites were investigated by means of X-ray diffraction（XRD）,scanning electron microscope（SEM） and rockwell hardness tester.The results indicated that with the increasing of temperature,the density and hardness of the composites increased at first and then decreased,and maximum density and hardness were obtained at 1150℃.With the extension of holding time,the size of TiC particles increased;the density and hardness of the composites increased at first and then decreased with the increasing of holding time,maximum density and hardness were obtained at the holding time of 5 min.The influences of pressure on the density and hardness are similar to that of the holding time,maximum density and hardness were obtained at the pressure of 40 MPa.

关 键 词：放电等离子烧结 原位合成 TIC 烧结温度 保温时间 压力 

分 类 号：TF19[冶金工程—冶金物理化学]