本文介绍用化学共沉淀和在适当温度下煅烧以直接制备ＹＡＧ－Ａｌ２Ｏ３纳米复合粉体的新方法．ＸＲＤ结果表明，所得粉体具纯的ＹＡＧ和α－Ａｌ２Ｏ３相，因此其化学组成符合配料的组分设计．用本方法制备的２５ｖｏｌ％ＹＡＧ－Ａｌ２Ｏ３复合粉体经热压烧结，所得的致密体材料为晶内型纳米复合材料，其抗育强度达 ６１２ＭＰａ，断裂韧性为 ４．５４ＭＰａ·ｍ－１／２，都比单相 Ａｌ２Ｏ３陶瓷有大幅度提高。
25vol%YAG-Al2O3 nanocomposite powders were prepared by the co-precipitaion method from ytrium nitrate and aluminium nitrate as starting materials.
The XRD pattern for the prepared powder calcined at 1300℃ for 1h shows well-defined peaks whose positions are almost identical
to those of stoichometic YAG and α-Al2O3. The powder compacts by hot-press sintering for 0.5 h at 1400℃ and 300MPa reached
a density close to the thoretical, while the normally reported hot-press sintering temperature for YAG-Al2O3 composites is 1600℃.
The bending strength and fracture toughness of prepared 25vol%YAG-Al2O3 nanocomposite were 612 MPa and 4.54 MP·m-1/2, respectively,
which are much higher than those of monolithic Al2O3 and monolithic YAG, as well as higher than those reported in other studies for YAG-Al2O3
composites. Microstructure studies found that the nano-YAG particles were mainly located within the Al2O3 grains.
参考文献
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