B_4C加入量对Si_3N_4结合SiC材料抗氧化性的影响  

Effects of B_4C additions on oxidation resistance of Si_3N_4 bonded SiC materials

作　　者：张志华[1] 王文武[1] 吴吉光[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2017年第1期28-31,共4页Refractories

摘　　要：为提高Si_3N_4结合SiC材料的高温抗氧化性,在黑碳化硅(粒度1.43~0.5和≤0.5 mm的颗粒料及粒度≤0.064 mm细粉)、硅粉(粒度≤0.043 mm)的基础配料中引入不同含量的B4C,以木质素磺酸钙为结合剂,经混练、成型、烘干后,在N2气氛下1 450℃保温10 h热处理,制备了Si_3N_4结合SiC材料。研究了900℃水蒸气气氛下,B_4C加入量(质量分数分别为0.4%、0.8%、1.2%、1.6%)对Si_3N_4结合Si C材料抗氧化性的影响。结果表明:Si_3N_4结合SiC材料中加入B_4C后,材料的体积密度增大,显气孔率减小,质量变化率改变,体积变化率减小,材料的抗氧化性得到显著提高,最合适的B_4C加入量(w)为0.4%。In order to improve the high temperature oxidation resistance of Si3N4 bonded SiC materials,Si3N4 bonded SiC specimens were prepared by adding different amounts of B4C into the basic formulation with black SiC （1.43-0.5, ≤0.5, ≤0. 064 mm） and silicon powder （≤0. 043 mm）,using calcium lignosulfonate as the binder,mixing,shaping,drying,hot treating at 1450℃ for 10 h in N2. Effects of B4C additions （0.4% ,0.8%, 1.2% ,and 1.6%, by mass,the same hereinafter） on the oxidation resistance of SigN4 bonded SiC materials were researched at 900 ℃ in water vapor. The results show that：for the specimens with B4C,the bulk density increases, apparent porosity decreases, mass change rate varies, volume change rate decreases,the oxidation resistance increases greatly,and the suitable B4C addition is 0.4%.

关 键 词：SI3N4结合SIC B4C 抗氧化性、 

分 类 号：TQ175[化学工程—硅酸盐工业]