人工晶体学报2017，Vol.46Issue(12)：2352-2355,2361,5.
Y2O3-Al2O3含量对Si3N4陶瓷相组成、致密化、显微结构和力学性能的影响
Effect of Y2O3-Al2O3 Contents on Phase Composition, Densification, Microstructure and Mechanical Properties of Si3N4 Ceramics
摘要
Abstract
The Si3N4 ceramics were prepared by hot-pressing at 1800℃using different amounts of Y2O3-Al2O3 as sintering additives and α-Si3N4 as raw powder.The effects of Y2O3-Al2O3 content on phase composition , densification , microstructure and mechanical properties were studied .The results show that dense Si3N4 ceramics could be hot-pressed by the addition of 6wt％Y2O3-Al2O3 at 1800 ℃.The densification of Si3N4 ceramics was not affected by the further increase of Y2O3-Al2O3 content, whereas the amounts of α-Si3N4 and β-Si3N4 phases in the ceramics were influenced by the Y2O3-Al2O3 content. The higher Y2O3-Al2O3 content could promote the α-βphase transformation .Regardless of the Y2O3-Al2O3 content , the Si3N4 ceramics had bimodal microstructures composed of fine equiaxedgrains and large elongated grains.When the Y2O3-Al2O3 content increased to 10wt％, the Si3N4 ceramics with higher content of elongated grains show more bimodal microstructure .Based on the present study , it was found that the Si3N4 ceramics with high hardness and high strength could be prepared by the addition of low Y2O3-Al2O3 content(6wt％), and the Si3N4 ceramics with high toughness and high strength could be obtained by the addition of high Y2O3-Al2O3 content(10wt％).关键词
Si3N4陶瓷/热压烧结/Y2O3-Al2O3助剂/致密化/力学性能/显微结构Key words
Si3 N4 ceramics/hot-press sintering/Y2 O3-Al2 O3 additive/densification/mechanical property/microstructure分类
通用工业技术引用本文复制引用
刘聪,郭伟明,赵哲,伍尚华..Y2O3-Al2O3含量对Si3N4陶瓷相组成、致密化、显微结构和力学性能的影响[J].人工晶体学报,2017,46(12):2352-2355,2361,5.基金项目
广东省引进领军人才专项资金(400120001) （400120001）
2014年广东省"扬帆计划"引进创新创业团队专项(2014YT02C049) （2014YT02C049）
