添加Al-Mg-Sc-Zr合金对热压烧结碳化硼组织及性能的影响  

Effects of adding Al-Mg-Sc-Zr alloy on microstructure and properties of boron carbide prepared by hot press sintering

作　　者：徐学军 徐志伟 袁铁锤[2] 周翔幸 XU Xuejun;XU Zhiwei;YUAN Tiechui;ZHOU Xiangxing(Zhongshan New Taixing Powder Metallurgy Co.,Ltd.,Zhongshan 528400,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中山市新泰兴粉末冶金有限公司,中山528400 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第6期587-595,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(52272077)。

摘　　要：以纯B4C粉末及气雾化Al-Mg-Sc-Zr合金粉末为原料,通过球磨法充分混合,采用热压烧结工艺制备B4C复合陶瓷,研究烧结温度和Al-Mg-Sc-Zr合金的加入对陶瓷显微组织、硬度、抗弯强度和断裂韧性的影响。结果表明:Al-Mg-Sc-Zr合金在高温下变为液相,且在烧结过程中与游离C、B4C发生反应,促进陶瓷烧结的同时降低了孔隙度。随烧结温度升高,陶瓷的相对密度提高,2100℃烧结的B4C复合陶瓷相对密度达到99.6%。Al-Mg-Sc-Zr合金的加入改善了B4C复合陶瓷的力学性能,2100℃烧结的陶瓷硬度(HV)达到了3859,抗弯强度和断裂韧性分别提高至(423.7±12.4)MPa和4.45 MPa·m^(1/2)。B4C composite ceramics were prepared by hot press sintering process with pure B4C powder and atomized Al-Mg-Sc-Zr alloy powder as raw materials mixed by ball milling method.The effects of sintering temperature and the addition of Al-Mg-Sc-Zr alloy on the microstructure,hardness,bending strength,and fracture toughness of the ceramics were investigated.The results show that Al-Mg-Sc-Zr alloy transforms into liquid phase at high temperature,and reacts with free C and B4C during sintering,which promotes sintering of ceramics and reduces porosity.With the increase of sintering temperature,the relative density of B4C composite ceramics increases,which can reach 99.6%when sintering at 2100℃.The addition of Al-Mg-Sc-Zr alloy improves the mechanical properties of B4C composite ceramics,the hardness(HV),bending strength,and fracture toughness of the ceramics sintered at 2100℃increase to 3859,(423.7±12.4)MPa,and 4.45 MPa·m^(1/2),respectively.

关 键 词：B4C 热压烧结 AL-MG-SC-ZR合金 微观组织 力学性能 

分 类 号：TB322[一般工业技术—材料科学与工程]