国产煅烧氧化铝粉体改性和自发凝固成型

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (10): 3798-3806.

国产煅烧氧化铝粉体改性和自发凝固成型

廖丽璇^1,2, 刘文龙¹, 吉浩浩¹, 毛君妍^1,2, 章健^1,2, 毛小建^1,2, 王士维^1,2

1.中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海 200050;
2.中国科学院大学材料科学与光电研究中心,北京 100049

收稿日期:2024-03-18 修订日期:2024-04-24 出版日期:2024-10-15 发布日期:2024-10-16
通信作者: 王士维,博士,教授。E-mail:swwang51@mail.sic.ac.cn
作者简介:廖丽璇(1999—),女,硕士研究生。主要从事氧化铝陶瓷注凝成型的研究。E-mail:liaolixuan21@mails.ucas.ac.cn
基金资助:
国家自然科学基金区域创新发展联合基金(北京)项目(U23A6014)

Modification and Spontaneous Coagulation Casting of Domestic Calcined Alumina Powder

LIAO Lixuan^1,2, LIU Wenlong¹, JI Haohao¹, MAO Junyan^1,2, ZHANG Jian^1,2, MAO Xiaojian^1,2, WANG Shiwei^1,2

1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2024-03-18 Revised:2024-04-24 Published:2024-10-15 Online:2024-10-16

摘要/Abstract

摘要： Al₂O₃陶瓷具有机械性能优异、耐酸碱腐蚀和性价比高等优点,是广泛应用的结构陶瓷。国产煅烧Al₂O₃粉体存在团聚严重和钠钾杂质含量高等问题,导致国内高品质Al₂O₃陶瓷制备严重依赖进口粉体。本工作首先采用球磨的方式对国内某公司Al₂O₃粉体进行解团聚,粉体的中位粒径D₅₀从1.88 μm降低到0.90 μm;之后,通过水洗降低粉体中杂质含量,Na含量从140×10^-6降低到60×10^-6,接近国外同级别粉体水平;最后,以MgO和MgAl₂O₄为烧结助剂,采用自发凝固成型制备Al₂O₃陶瓷素坯。发现MgO引起浆料黏度增大,而MgAl₂O₄不影响浆料黏度,并且两者都能降低烧结温度和抑制晶粒异常长大,平均晶粒尺寸从41.10 μm降低到10.64 μm,提升了Al₂O₃陶瓷的力学性能。通过解团聚和除杂处理,国产Al₂O₃粉体能够达到与同级别性能最好的日本住友Al₂O₃粉体相当水平。

关键词: 国产氧化铝粉体, 烧结助剂, 自发凝固成型, 杂质, 团聚, 力学性能

Abstract: Al₂O₃ ceramics are the most widely used structural ceramics because of excellent mechanical properties, acid and alkali corrosion resistance and high quality-price-ratio. Due to serious agglomeration and high content of sodium and potassium impurities in domestic calcined Al₂O₃ powder, the preparation of Al₂O₃ ceramics with high performance relies heavily on imported powder. In this work, the Al₂O₃ powder produced by a domestic company was firstly disaggregated using ball milling, and the median particle size D₅₀ of the powder was reduced from 1.88 μm to 0.90 μm. Afterwards, the impurity content in the powder was reduced by washing with water, and the Na content was reduced from 140×10^-6 to 60×10^-6, which was close to the level of the same grade powder abroad. Finally, Al₂O₃ ceramic green bodies were prepared by spontaneous coagulation casting using MgO and MgAl₂O₄ as sintering aids. It is found that the addition of MgO increases the slurry viscosity, while MgAl₂O₄ does not affect that, and both can effectively reduce the sintering temperature and inhibit the grain growth. And the average grain size is reduced from 41.10 μm to 10.64 μm, which improves the mechanical properties of Al₂O₃ ceramics. Through disaggregation and purification, the domestic Al₂O₃ powder can reach the same level as the Japanese Sumitomo Al₂O₃ powder with the best performance in the same grade.

Key words: domestic Al₂O₃ powder, sintering aid, spontaneous coagulation casting, impurity, agglomeration, mechanical property

中图分类号:

TQ174

廖丽璇, 刘文龙, 吉浩浩, 毛君妍, 章健, 毛小建, 王士维. 国产煅烧氧化铝粉体改性和自发凝固成型[J]. 硅酸盐通报, 2024, 43(10): 3798-3806.

LIAO Lixuan, LIU Wenlong, JI Haohao, MAO Junyan, ZHANG Jian, MAO Xiaojian, WANG Shiwei. Modification and Spontaneous Coagulation Casting of Domestic Calcined Alumina Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(10): 3798-3806.

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