为提高Si3N4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10h热处理,制备了Si3N4结合SiC材料.研究了900℃水蒸气气氛下,B4C加入量(质量分数分别为0.4％、0.8％、1.2％、1.6％)对Si3N4结合SiC材料抗氧化性的影响.结果表明:Si3N4结合SiC材料中加入B4C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B4C加入量(ω)为0.4％.
In order to improve the high temperature oxidation resistance of Si3N4 bonded SiC materials,Si3 N4 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 1 450 ℃ 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 Si3N4 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％.
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