Articles
  • Effect of MgO-CaO-Al2O3-SiO2 glass additive on densification of Al2O3 ceramics

  • Dagyeong Leea,b, Hyun Seon Hongb, Hyeondeok Jeonga,* and Sung-Soo Ryua,*

  • aEngineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, Republic of Korea
    bDepartment of Environment & Energy Engineering, Sungshin Women’s University, Seoul 01133, Republic of Korea

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigated the effect of the MgO-CaO-Al2O3-SiO2 (MCAS) additive on the densification of Al2O3 ceramics. MCAS was synthesized using a polymeric-complex method. We analyzed the densification behavior, using dilatometric analysis up to 1600 oC, and the results showed that sinterability increased with increasing MCAS content. Al2O3 samples were prepared by isothermal sintering at 1400, 1500, and 1600 oC. The microstructure, phase formation, and hardness of the samples were analyzed and discussed in relation to both the MCAS content and sintering temperature. The density of the MCAS-doped samples sintered at 1500 and 1600 oC was over 98%, and the maximum relative density was 99.7%. The highest hardness (18 GPa) was achieved for the sample prepared with 3 wt.% MCAS and sintered at 1500 oC for 1 h because further doping resulted in excessive grain growth. These results elucidate the conditions required for pressure-free sintering


Keywords: Al2O3, Sintering additive, MCAS glass, Dilatometry, Densification

This Article

  • 2022; 23(2): 149-153

    Published on Apr 30, 2022

  • 10.36410/jcpr.2022.23.2.149
  • Received on May 18, 2021
  • Revised on Oct 5, 2021
  • Accepted on Oct 9, 2021

Correspondence to

  • Hyeondeok Jeong and Sung-Soo Ryu

  • Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, Republic of Korea
    Tel : +82 31 645 1482 Fax: +82 31 645 1485

  • E-mail: jhd526@kicet.re.kr (H. Jeong), ssryu@kicet.re.kr (