MgO-Y2O3-Re2O3添加对氮化硅陶瓷微观组织及性能的影响

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摘要以α-Si₃N₄为原始粉料,MgO-Y₂O₃-Re₂O₃为烧结助剂,采用热压烧结法制备氮化硅陶瓷。通过阿基米德排水法、XRD、SEM、三点弯曲法、压痕法和激光闪光法分别对氮化硅的致密度、相组成、显微结构、抗弯强度、断裂韧性和热导率进行检测。研究表明：添加MgO-Y₂O₃-Re₂O₃(Re=Er、Sm、Dy、La、Y、Yb)的样品中,Sm₂O₃、Y₂O₃、Yb₂O₃易促使Y₂O₃分别形成第二相Y₂SiO₃、Y₂Si₃O₃N₄和Y₂SiO₅。同时,添加MgO-Y₂O₃-Re₂O₃(Re=Sm、Dy、La、Yb)的Si₃N₄中,长柱状晶均匀地镶嵌在较小的基体晶粒中,起自增强增韧作用,其抗弯强度均在920 MPa以上,断裂韧性均在6.93 MPa∙m^1/2以上。与传统二元烧结助剂MgO-Re₂O₃相比,MgO-Y₂O₃-Re₂O₃三元添加剂中Re³⁺半径的改变,对Si₃N₄陶瓷显微结构、抗弯强度及断裂韧性未产生规律性的影响,但其热导率随添加剂Re³⁺半径减小而增大。

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	鲁欣欣
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关键词 ： MgO-Y₂O₃-Re₂O₃, 三元添加剂, 热导率, 抗弯强度, 断裂韧性

Abstract：Using α-Si₃N₄as raw powder and MgO-Y₂O₃-Re₂O₃ as sintering assistant, Si₃N₄ ceramics were prepared by hot-pressing sintering, and the density, phase composition, microstructure, thermal conductivity, bending strength and fracture toughness of Si₃N₄ were tested by archimedean drainage method, XRD, SEM, laser flash method, three-point bending method and indentation method. Studies show that in samples with MgO-Y₂O₃-Re₂O₃ (Re=Er, Sm, Dy, La, Y, Yb) added, Sm₂O₃, Y₂O₃,Yb₂O₃ are easy to facilitate Y₂O₃ to form the second phase Y₂SiO₃, Y₂Si₃O₃N₄ and Y₂SiO₅, respectively. Meanwhile, in the Si₃N₄ with MgO-Y₂O₃-Re₂O₃ (Re=Sm, Dy, La,Yb) added, the long columnar crystals are uniformly embedded in the smaller matrix grains, with self-strengthening and toughening. The bending strength is above 920 MPa, and the fracture toughness of indentation is above 6.93 MPa∙m^1/2. Compared with traditional binary sintering assistant MgO-Re₂O₃, MgO-Y₂O₃-Re₂O₃ ternary additive has no regular influence on the microstructure, bending strength and fracture toughness of Si₃N₄ ceramics with the change of Re³⁺ radius, but its thermal conductivity increases with the decrease of Re³⁺ radius.

Key words： MgO-Y₂O₃-Re₂O₃ ternary additive thermal conductivity bending strength fracture toughness

收稿日期: 2019-08-07 出版日期: 2020-06-19

ZTFLH:

TQ174

基金资助:国家重点研发计划(2017YFB0310600)

通讯作者: 刘伟,副教授,博士。电话：18565348721;E-mail: 317127238@qq.com

引用本文:

鲁欣欣, 刘伟, 李林, 李建斌. MgO-Y₂O₃-Re₂O₃添加对氮化硅陶瓷微观组织及性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(6): 536-541.
LU Xinxin, LIU Wei, LI Lin, LI Jianbin. Effects of MgO-Y₂O₃-Re₂O₃ on microstructure and properties of Si₃N₄ ceramics. Materials Science and Engineering of Powder Metallurgy, 2019, 24(6): 536-541.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I6/536

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