摘要
以碳化硅、六水硝酸钇、九水硝酸铝和六次甲基四胺为主要原料,通过溶胶-凝胶法引入Al2O3和Y2O3复合烧结助剂,液相烧结制备得到SiC-Y3Al5O12(Y3Al5O12简称YAG)复相陶瓷。采用DTA、TEM、XRD等分析测试技术研究了溶胶-凝胶法引入复合烧结助剂过程及复合烧结助剂对SiC-YAG陶瓷的烧结性能、力学性能、物相组成与显微结构的影响。结果表明:干凝胶在920℃左右已完全转变成YAG相,最终获得的YAG粒径小,并均匀分散在SiC表面的SiC-YAG复合粉体;复合粉体先干压、再等静压成型后,在1860℃下烧结45min,所制得复相陶瓷的相对密度达到了96.5%,抗弯强度达到486MPa,断裂韧性达到5.7MPa·m1/2。
The SiC-Y3Al5O12 (shorten as YAG) ceramics were prepared using SiC powder (average size 0.86 μm), Al(NO3)3 · 9H2O and Y(NO3)3 · 6H2O as main starting materials, and Al2O3 and Y2O3 composite powders as sintering aids were introduced to SiC powder via sol-gel method. The process of introducing sintering aids via sol-gel method and the effects of composite sintering aids on sintering property, mechanical property, phase composition and microstructure of sintered SiC-YAG ceramics were studied by DTA, XRD and TEM. The results showed that the Al2O3-Y2O3 gel distributed on the surface of SiC grains homogeneously and transformed to YAG phase at 920°C. The composite SiC-YAG ceramics obtained by firing the SiC-YAG composite powder at 1860°C for 45 min had the relative density of 96.5%, bending strength of 486 MPa and fracture toughness of 5.7 MPa · m1/2.
出处
《耐火材料》
EI
CAS
北大核心
2005年第3期192-195,共4页
Refractories
