铸造技术2017，Vol.38Issue(6)：1269-1273,5.DOI:10.16410/j.issn1000-8365.2017.06.004
两步常压烧结工艺对氧化铝陶瓷制备及性能的影响
Effect of Two-Step Pressureless Sintering Process on Preparation and Properties of Alumina Ceramics
摘要
Abstract
High-dense alumina ceramics were prepared through the two-step pressureless sintering process with high-purity alumina powder as raw materials and high-purity MgO as sintering aids.The effects of the sintering temperature T1 at the first step,the sintering time t at the second-step temperature T2 and the content of sintering aids on the relative density,microstructures and mechanical properties of the alumina ceramics were studied.The results indicate that the relative density increases with the increase of T1 or prolonging the sintering time t at T2.Whereas it first increases and then decreases with the increase of MgO content.Higher T1 temperature and extending sintering time t result in larger grain size.The addition of MgO is beneficial to decrease in grain size due to the pinning effect of the second phase.Longer sintering time will promote the growth of the grain,which accompanies with the Ostwald ripening of the grain,and led to non-uniformity of grain size distribution because the smaller grains disappear and the number of larger grains increase.The strength of the sample depends on the densification degree and grain size.For the samples sintered in a shorter time,the nigher sintering temperature T1 will lead to better mechanical properties,while the longer sintering time is opposite.The increase of MgO content will refine the grains,but cause the decrease of density,which lead to that the strength increases firstly and then decreases slightly with the increase of the MgO content.关键词
氧化铝陶瓷/两步常压烧结/致密化/力学性能Key words
alumina ceramics/two-step pressureless sintering process/densification/mechanical properties分类
矿业与冶金引用本文复制引用
高昌乐,王子敬,刘凯凯,王旭东,杨建锋,王波..两步常压烧结工艺对氧化铝陶瓷制备及性能的影响[J].铸造技术,2017,38(6):1269-1273,5.基金项目
国家自然科学基金资助项目(51672209) （51672209）
神华集团科技创新资助项目(csie16036600) （csie16036600）
中国教育部博士点基金资助项目(20130201120003) （20130201120003）
陕西省自然科学基础研究计划资助项目(2016jq5046) （2016jq5046）
