无机材料学报 ›› 2019, Vol. 34 ›› Issue (10): 1067-1071.DOI: 10.15541/jim20180589

• 研究论文 • 上一篇    下一篇

细晶MgO·1.44Al2O3透明陶瓷的制备及其性能研究

郭胜强,王皓(),涂兵田,王斌,徐鹏宇,王为民,傅正义   

  1. 武汉理工大学 材料复合新技术国家重点实验室, 武汉 430070
  • 收稿日期:2018-12-17 修回日期:2019-02-02 出版日期:2019-09-23 发布日期:2019-05-29
  • 作者简介:郭胜强(1993-), 男, 硕士研究生. E-mail: 2414001214@qq.com
  • 基金资助:
    国家重点研发计划(2017YFB0310500);国家自然科学基金(51472195);国家自然科学基金(51502219)

Fabrication and Property of Fine-grained MgO·1.44Al2O3 Spinel Transparent Ceramic

GUO Sheng-Qiang,WANG Hao(),TU Bing-Tian,WANG Bin,XU Peng-Yu,WANG Wei-Min,FU Zheng-Yi   

  1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2018-12-17 Revised:2019-02-02 Online:2019-09-23 Published:2019-05-29
  • Supported by:
    National Key Research and development Program of China(2017YFB0310500);National Natural Science Foundation of China(51472195);National Natural Science Foundation of China(51502219)

摘要:

晶粒细化是提高镁铝尖晶石透明陶瓷机械性能的有效途径之一。本研究采用单相MgO·1.44Al2O3陶瓷粉体, 首先通过放电等离子烧结进行成型和预致密化, 然后无压烧结达到烧结末期, 最终在180 MPa下1500 ℃热等静压烧结5 h, 制备出细晶MgO·1.44Al2O3透明陶瓷。无压烧结的结果表明: 缩窄气孔尺寸分布、降低平均气孔尺寸有助于显著促进陶瓷的致密化, 得到平均晶粒尺寸为1.4 μm、致密度为96.7%的闭气孔烧结体。透明陶瓷的平均晶粒尺寸为1.9 μm, 维氏硬度为(13.94±0.20) GPa, 杨氏模量为289 GPa。同时, 样品具有良好的光学透过率, 厚度为2 mm的样品在可见光和红外波段的最大直线透过率分别为70%和80%。

关键词: MgO·1.44Al2O3;, 坯体结构, 致密化, 细晶透明陶瓷, 硬度

Abstract:

Grain refinement is an effective way to enhance mechanical property of MgO·nAl2O3 spinel transparent ceramics. In this study, the porous body was firstly compacted and pre-densified by spark plasma sintering using pure phase MgO·1.44Al2O3 ceramic powder as raw material. Then, further densification at final stage has been achieved through pressureless sintering. Finally, a fine-grained MgO·1.44Al2O3 spinel transparent ceramic was fabricated by hot isostatic pressing at 1500 ℃ for 5 h under 180 MPa of argon. Pressureless sintering results show that narrowing the pore size distribution and reducing the average pore size can promote the densification process dramatically. And the pore-closed ceramic with average grain size of 1.4 μm and relative density of 96.7% was obtained. The transparent ceramic shows average grain size of 1.9 μm, Vickers hardness of (13.94±0.20) GPa and Young's modulus of 289 GPa. In addition, the 2-mm-thick product also displayed excellent optical transparency with the maximum transmittance 70% in visible region and 80% in infrared region, respectively.

Key words: MgO·1.44Al2O3;, microstructure of green body, densification, fine-grained transparent ceramic, hardness

中图分类号: