Densification behavior, microstructure, mechanical and optical properties of Mg-doped sialon with fluoride additives

被引：16

作者：

Yang, Zhangfu ^{[1
]}

Wang, Bin ^{[2
]}

Ren, Yajun ^{[1
]}

Liu, Yin ^{[1
]}

Shang, Qinglin ^{[3
]}

Yang, Yong ^{[3
]}

Liu, Xin ^{[2
]}

Wang, Hao ^{[2
]}

机构：

[1] Anhui Univ Sci & Technol, Sch Mat Sci & Engn, Huainan 232001, Anhui, Peoples R China

[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

[3] Tianjin Jinhang Inst Tech Phys, Tianjin Key Lab Thin Film & Opitcs, Tianjin 300192, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2017年 / 37卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Sialon; Densification; Microstructure; Mechanical properties; Optical properties; ALPHA-SIALON; SILICON-NITRIDE; CALCIUM ALUMINOSILICATE; GLASS-FORMATION; CERAMICS; CAF2; TEMPERATURE;

D O I：

10.1016/j.jeurceramsoc.2017.01.002

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mg-doped sialon ceramics with the composition of M0.4Si10.2Al1.8O1N15 were fully densified by hot pressing at 1850 degrees C for 1 h, using 0.5 wt.% MgF2 or CaF2 as a sintering additive. Densification behavior, phase assemblage, microstructure, and mechanical and optical properties were investigated in detail. The addition of fluorides, especially MgF2, not only resulted in more high-temperature liquid by promoting the dissolution of more N and other constituents but also reduced the viscosity of liquid due to the terminal effect of fluorine. Consequently, the densification was effectively improved. Additionally, the fluoride addition facilitated the formation of a small amount of beta-sialon. Both the samples possessed high hardness (similar to 20 GPa) and fracture toughness (similar to 4.2 MPa m(1/2)). The CaF2-added sample exhibited higher infrared transmittance than its counterpart due to less residual glass phase. The present work implies that fluorides are also very effective sintering additives for densifying alpha-sialon. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：1985 / 1992

页数：8

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