Influence of powder characteristics on the sintering behaviour of reactive alumina powders-Reference-Cited by-同舟云学术

Influence of powder characteristics on the sintering behaviour of reactive alumina powders

Published:2022 Issue:1 Volume:16 Page:1-6
ISSN:1820-6131
Container-title:Processing and Application of Ceramics
language:en
Short-container-title:PAC

Author:

Tang Hai¹,Shi Yingheng¹,Yuan Wenjie²

Affiliation:

1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China

2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China + National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, China

Abstract

Fine reactive alumina powders have a significant impact on the properties of refractories at high temperatures. Except for the hydration of cement and in situ reactions, the performance of castables is also correlated with the sintering of reactive alumina. The characteristics of fine alumina powders produced by various manufacturers are quite different. This work aims to investigate the comprehensive influence of powder characteristics on the sintering behaviour of reactive alumina powders. Three types of commercial reactive alumina powders were selected for experiments. The linear shrinkage, bulk density, apparent porosity and microstructure of alumina compacts calcined at different temperatures were analysed. It was demonstrated that large specific surface area and higher SiO2 content had a positive effect on the densification of alumina compacts. The calculation based on the hypothetical composition of alumina grain boundary indicated that SiO2 mainly participated in the formation of liquid. Therefore, more liquid was generated at the grain boundary of alumina grains containing higher SiO2 content, which resulted in better sinterability of reactive alumina powders.

Publisher

National Library of Serbia

Subject

Ceramics and Composites

Reference21 articles.

1. L. Fu, A. Huang, H. Gu, H. Ni, “Properties and microstructures of lightweight alumina containing different types of nano-alumina”, Ceram. Int., 44 [15] (2018) 17885-17894.

2. M. Vukšić, I. Žmak, L. Ćurković, D. Ćorić, P. Jenuš, A. Kocjan, “Evaluating recycling potential of waste alumina powder for ceramics production using response surface methodology”, J. Mater. Res. Technol., 11 (2021) 866- 874.

3. E. Lukin, N. Makarov, I. Dodonova, S. Tarasova, E. Bad’ina, N. Popova, “New ceramic materials based on aluminum oxide”, Refract. Ind. Ceram., 42 (2001) 261-268.

4. H. Li, X. Xi, J. Ma, K. Hua, A. Shui, “Low-temperature sintering of coarse alumina powder compact with sufficient mechanical strength”, Ceram. Int., 43 [6] (2017) 5108-5114.

5. J. Du, B. Tang, W. Liu, T. Zhang, J. Peng, H. Chen, Y. Lei, “Effects of annealing and firing in wet hydrogen on the dielectric breakdown strengths of alumina ceramics”, J. Adv. Ceram., 9 [2] (2020) 173-182.