催化剂对Al_(2)O_(3)-SiC-C浇注料显微结构和性能的影响  

Effects of catalyst on microstructure and properties of Al_(2)O_(3)-SiC-C castables

作　　者：程翠丽 赵子尖 任世怡 李磊[1] 陈平安[1] 李享成[1] 朱伯铨[1] Cheng Cuili;Zhao Zijian;Ren Shiyi;Li Lei;Chen Ping’an;Li Xiangcheng;Zhu Boquan(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;不详)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《耐火材料》2022年第4期320-324,共5页Refractories

基　　金：国家自然科学基金资助项目(51774218);湖北省大学生创新创业训练计划项目(S202010488009)。

摘　　要：以球磨法制备La_(2)O_(3)掺杂Ni,并以此为催化剂,以板状刚玉、SiC粉、球状沥青、α-Al_(2)O_(3)微粉、SiO_(2)微粉、Al-Si合金粉和铝酸钙水泥为主要原料,制备了Al_(2)O_(3)-SiC-C浇注料试样。研究了催化剂和热处理温度(500、700、900、1100和1450℃分别保温3 h)对试样显微结构和性能的影响。结果表明,球磨后Ni的XRD衍射峰强度明显降低,角度产生偏移,表明La固溶到Ni中,Ni的晶格产生畸变;随着热处理温度升高,添加催化剂的试样中一维相(CNTs和SiC晶须)和二维相(钙铝黄长石)逐渐增多,抗折强度和耐压强度分别达到极大值。因此,添加La_(2)O_(3)掺杂Ni催化剂可以明显增加浇注料中一维和二维增强相的生成量,提高浇注料试样的强度。The La_(2)O_(3)doping Ni was prepared by ball-milling method and added into the Al_(2)O_(3)-SiC-C castable specimens as the catalyst,which were prepared using tabular corundum,SiC powder,ball pitch,α-Al_(2)O_(3)micropowder,SiO_(2)micropowder,Al-Si alloy powder,and calcium aluminate cement as raw materials.Effects of the catalyst and the hot treatment temperatures(500,700,900,1100,and 1450℃for 3 h)on the microstructure and the properties of the castables were investigated.The results reveal that after ball milling,the X-ray diffraction peak intensity of Ni decreases drastically and the angle of Ni shifts,suggesting that the lattice of Ni is distorted due to the La dissolution into Ni.With the temperature rising,the one-dimensional phases(CNTs and SiC whiskers)and two-dimensional phase(gehlenite)in the castables containing catalyst increase,the modulus of rupture and the crushing strength reach the maximum values,respectively.Therefore,the La_(2)O_(3)doping Ni can obviously increase the one-dimensional and two-dimensional strengthening phases in the castables and enhance the strength of the castables.

关 键 词：Al_(2)O_(3)-SiC-C浇注料 La_(2)O_(3) Ni 增强增韧 

分 类 号：TQ175[化学工程—硅酸盐工业]