六面顶低温超高压烧结制备SiC–Al_2O_3–Y_2O_3陶瓷  

SiC–Al_2O_3–Y_2O_3 Ceramic Sintered by Hinge-Type Cubic-Anvil Press Method at Low Temperature and Ultrahigh Pressure

作　　者：铁健 柳馨[1] 铁生年[1] 

机构地区：[1]青海大学新能源光伏产业研究中心,西宁810016

出　　处：《硅酸盐学报》2017年第6期841-846,共6页Journal of The Chinese Ceramic Society

基　　金：青海省重点实验室发展专项资金(2015-Z-Y02)

摘　　要：以微纳米SiC为原料,采用六面顶压机在1 250℃、4.5 GPa、无烧结助剂、不同保温时间条件下烧结SiC陶瓷,优化出最佳保温时间为6 min。采用不同添加量Al_2O_3、Y_2O_3(0~15%,质量分数)烧结助剂超高压烧结SiC陶瓷。用X射线衍射、场发射扫描电子显微镜、X射线能谱分析、显微硬度及密度测试对SiC高压烧结体进行了表征。结果表明:同时添加Al_2O_3和Y_2O_3为有效低温烧结助剂,在低温超高压烧结条件下,掺杂不同比例烧结助剂的SiC陶瓷产生的新相为Al_2Y_4O_9。其中,添加7.5%Al_2O_3、7.5%Y_2O_3,经1 250℃、4.5 GPa保温保压6 min超高压烧结条件下,样品相对密度达99.9%,显微硬度可达到HV9.80 2 570。High density SiC ceramic was fabricated with pure SiC micro- and nano-powders in a hinge-type cubic-anvil press method at 4.5 GPa and 1 250 ℃ for an optimum heat-preserving time of 6 rain. SiC ceramic was sinterred at a ultrahigh pressure and different amounts of Al2O3, Y2O3 （0-15% in mass fraction） as sintering aids. The samples were characterized by X-ray diffraction, field emission electron microscopy, X-ray energy spectroscopy, micro-hardness and density tests, respectively. The result shows that the Al2O3 and Y2O3 are effective in low-temperature sintering. At a low temperature and a ultrahigh pressure, SiC ceramic can appear a phase of Al2Y4O9. The relative density of sample sintered with Al2O3 of 7.5% and Y2O3 of 7.5% at 4.5 GPa and 1 250 ℃ for 6 min is 99.9%, and the micro-hardness can reach Hv 0.980 2 570.

关 键 词：六面顶技术 超高压烧结 氧化铝 氧化钇 微纳米碳化硅 

分 类 号：TB383[一般工业技术—材料科学与工程]