Aluminum titanate based composite porous ceramics with both high porosity and mechanical strength prepared by a special two-step sintering method

被引:17
作者
Wang, Yirong [1 ,2 ]
Wang, Xueqian [1 ,2 ]
Liu, Chuanbao [3 ]
Su, Xiaopo [1 ,2 ]
Yu, Chengye [1 ,2 ]
Su, Yanjing [1 ,2 ]
Qiao, Lijie [1 ,2 ]
Bai, Yang [1 ,2 ]
机构
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Al2TiO5; Porous ceramics; Two-step sintering; Mechanical property; SOLID-STATE REACTION; OXIDE FUEL-CELL; ELECTRICAL-PROPERTIES; PORE STRUCTURES; GRAIN-GROWTH; MICROSTRUCTURE; TIO2; BEHAVIOR; POWDER; AL2O3;
D O I
10.1016/j.jallcom.2020.157193
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, we develop a two-step sintering technology special for porous ceramics to resolve the contradiction between porosity and mechanical strength. It contains a first long-time sintering at the relatively low temperature (T-1) and a second fast sintering at higher temperature (T-2). Porous ceramics of aluminum titanate-strontium feldspar-mullite (ASM) ternary composite were prepared by this method, and exhibit both high porosity and high mechanical strength. The effects of T-1 and T-2 on the phase composition, microstructure, porosity, pore size distribution, mechanical strength and thermal expansion coefficient (TEC) of ASM porous ceramics are systematically studied. The sample sintered at T-1 = 1400 degrees C & T-2 = 1500 degrees C shows optimum performance: the porosity, bulk density, and mean pore diameter (D-50) are 63.48%, 1.20 g/cm3 and 15.94 mm, respectively; while the flexural strength reaches 9.22 MPa and the TEC is 2.9 x 10(-6)/K. The two-step sintering technology provides a powerful tool to develop porous ceramics with excellent comprehensive properties. (c) 2020 Elsevier B.V. All rights reserved.
引用
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页数:9
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