采用共沉淀法合成的钇铝石榴石（YAG）粉体真空烧结制备多孔陶瓷,通过分析讨论表明,YAG前驱体中绝大部分吸附水蒸发以及绝大部分Al（OH）3和Y（OH）3的分解分别转变成Al2O3和Y2O3失去离子水而产生的失重出现在600℃以下完成。YAG前驱体在1100℃下煅烧后,大量YAG晶相已经形成,而且具有完整的晶型。升高煅烧温度对晶粒尺寸和晶粒形貌的影响显著,也说明YAG粉体颗粒粒径和形貌对最终煅烧温度非常敏感。采用真空烧结技术,成功制备了孔结构均匀规整,大部分微孔径处于5μm左右,且外形保持良好的YAG多孔陶瓷,综合考虑性价比,确定YAG多孔陶瓷的烧结温度为1500℃较为适宜。
Pure YAG powders were prepared by co-precipitation method and then porous ceramics was fabricated by vacuum sintering technology,using the YAG powders as precursor.The YAG powders and the porous ceramics were characterized by TG-DSC thermal analyzer,XRD and SEM.The results show that the most weightloss of YAG precursor occurs under 600 ℃ with the evaporation of absorbed water and the decomposition of hydroxid.YAG crystalline is obtained after calcining the YAG precursor at 1100 ℃.The particle size and morphology of YAG powders are sensitive to the calcining temperature.YAG porous ceramics with homogeneous and regular pore microstructure in which the regular pore size is about 5 μm,are prepared by vacuum sintering method,and the sintering temperature of 1500 ℃ is recommended considering cost performance.
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