无压烧结氮化硅陶瓷的致密化过程

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摘要在陶瓷粉末中添加Al₂O₃-Y₂O₃作为助烧剂,经过干压和冷等静压成形,然后无压烧结制备Si₃N₄陶瓷,通过TOM-AC实时观测烧结过程中Si₃N₄陶瓷样品的收缩和致密度变化;分析不同温度烧结的陶瓷结构与形貌,并研究Si₃N₄陶瓷的致密化过程。结果表明：1 400 ℃时α-Si₃N₄开始转变为β-Si₃N₄,在1 400~1 600 ℃范围内致密度快速增大,且压坯密度越高,致密化速率越快。烧结温度高于1 600 ℃时,α-Si₃N₄全部转变为β-Si₃N₄柱状晶,晶粒明显长大,致密化速率降低。压坯密度对最终的烧结致密度影响不大。由此确定最佳烧结工艺为1 650 ℃与1 800 ℃分别保温2 h,所得Si₃N₄陶瓷的致密度为98.4%,硬度(HV₁₀)为15.7±0.5 GPa,抗弯强度和断裂韧性分别为1037.3±48.9 MPa和5.8±0.2 MPa∙m^1/2。

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	刘文勇
	李建斌
	孙振飞
	蒋强国

关键词 ： Si₃N₄陶瓷, 无压烧结, 收缩, 致密化过程, TOM-AC

Abstract：Silicon nitride ceramics were prepared by pressureless sintering, with Al₂O₃-Y₂O₃ as sintering aids, after dry pressing and cold isostatic pressing. The shrinkage and densification of Si₃N₄ ceramics was observed in real time with TOM-AC high temperature sintering equipment. Meanwhile, the densification process of Si₃N₄ ceramics was studied by analyzing the structure and morphology of ceramics sintered at different temperatures. The results show that α-Si₃N₄ begins to transform into β-Si₃N₄at 1 400 ℃. The density increases rapidly in the range of 1 400-1 600 ℃, and the higher the density of compact, the faster the densification rate. When the sintering temperature is higher than 1 600 ℃, α-Si₃N₄ transforms into β-Si₃N₄ columnar crystal completely, and the crystal grain grows obviously, while the densification rate decreases. The compacts density has little effect on the final sintering density. The optimal sintering process is sintering at 1 650 ℃ and 1 800 ℃ for 2 h respectively. The density of Si₃N₄ ceramics is 98.4%, and the hardness (HV₁₀) is 15.7±0.5 GPa. The bending strength and fracture toughness are 1037.3±48.9 MPa and 5.8±0.2 MPa∙m1/2, respectively.

Key words： Si₃N₄ ceramic pressureless sintering shrinkage densification process TOM-AC

收稿日期: 2019-12-26 出版日期: 2020-08-11

ZTFLH:

TQ174

基金资助:国家重点研发计划资助项目(2017YFB0310600); 国家自然科学基金青年基金资助项目(51602059); 广东省“珠江人才计划”本土创新科研团队项目(2017BT01C169)

通讯作者: 蒋强国,讲师,博士。电话：15989026587;E-mail: qiangguojiang@gdut.edu.cn

引用本文:

刘文勇, 李建斌, 孙振飞, 蒋强国. 无压烧结氮化硅陶瓷的致密化过程[J]. 粉末冶金材料科学与工程, 2020, 25(3): 191-196.
LIU Wenyong, LI Jianbin, SUN Zhenfei, JIANG Qiangguo. Densification process of pressureless sintered silicon nitride ceramics. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 191-196.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I3/191

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