无机材料学报 ›› 2018, Vol. 33 ›› Issue (4): 373-379.DOI: 10.15541/jim20170206

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形核密度对AlON粉体合成及其透明陶瓷制备的影响

许建鑫1, 单英春1, 王光1, 徐久军1, 王亮1, 李江涛2   

  1. 1. 大连海事大学 材料系, 大连 116026;
    2. 中国科学院 理化技术研究所, 北京 100080
  • 收稿日期:2017-04-28 修回日期:2017-06-20 出版日期:2018-04-30 发布日期:2018-03-27
  • 作者简介:许建鑫(1990-), 男, 博士研究生. E-mail: xujianxinxjx@163.com
  • 基金资助:
    国家重点研发计划(2017YFB0310300);中央高校基本科研业务费专项资金(3132017028)

Nucleation Density on the Synthesis of AlON Powder and Preparation of Transparent Ceramics

XU Jian-Xin1, SHAN Ying-Chun1, WANG Guang1, XU Jiu-Jun1, WANG Liang1, LI Jiang-Tao2   

  1. 1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China;
    2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2017-04-28 Revised:2017-06-20 Online:2018-04-30 Published:2018-03-27
  • About author:XU Jian-Xin. E-mail: xujianxinxjx@163.com
  • Supported by:
    National Key R&D Program of China (2017YFB0310300); Fundamental Research Funds for the Central Universities(3132017028)

摘要:

α-Al2O3为原料, 采用碳热还原氮化法合成AlON粉体, 利用活性炭和亚微米碳粉改变球磨后一次粉体(α-Al2O3和C混合粉体)的形核密度, 并研究形核密度对AlON粉体相组成、形貌及其透明陶瓷透光性的影响。结果表明, 形核密度不同的一次粉体在1750℃保温60 min均能合成纯相AlON粉体, 但是所合成的两种AlON粉体形貌和性能差异较大。高形核密度下(添加活性炭)合成的AlON粉体形貌不规则、结构疏松且晶粒较小, 并易于球磨获得细颗粒粉体(~0.93 μm); 而低形核密度下(添加亚微米碳粉)合成的AlON粉体整体形貌呈近球形, 晶粒发育较完整, 且尺寸较大, 该粉体球磨后颗粒尺寸较大(~2.13 μm)。因此, 形核密度是影响AlON粉体形貌、结构特征和破碎性的主要因素。研究结果表明, 高形核密度粉体合成的AlON粉体具有更好的烧结活性, 它在1880℃保温150 min获得的透明陶瓷最大红外透过率达76.5% (3 mm厚), 比低形核密度粉体制备的透明陶瓷提高48.3%。因此, 以α-Al2O3为原料时, 提高形核密度有利于制备颗粒较小的高活性AlON粉体, 该粉体适合制备高透过率AlON透明陶瓷。

 

关键词: AlON, α-Al2O3;, 形核密度, 活性炭, 亚微米碳粉

Abstract:

Aluminum oxynitride (AlON) powders were synthesized by carbothermal reduction and nitridation process using α-Al2O3 powder as starting material. Activated charcoal powder and submicron carbon powder were mixed with α-Al2O3 respectively to vary nucleation density of AlON. Influence of nucleation density on phase assemblages, morphology of AlON powders and transparence of AlON ceramics were studied. Single phase AlON powders were synthesized after holding at 1750℃ for 60 min with for both mixture powders of different nucleation density. The results show that the synthesized powders exhibit different morphology and milling property. The AlON powder synthesized by α-Al2O3 and activated charcoal mixture show irregular shape, loose structure and small particle size, due to its high nucleation density. Moreover, it is easier to mill the obtained AlON powder into small particle (0.93 μm). However, for the AlON powder synthesized by mixture of α-Al2O3 and submicron carbon powder, their grain grow obviously during the synthesis of the AlON powder, due to its low nucleation density with large near sphere particles close to 2.13 μm in diameter. Therefore, nucleation density plays a key role in controlling morphology, structure characteristics and milling performance of the AlON powders. Using the AlON powder synthesized by high nucleation density powders, high transparent AlON ceramics was fabricated by pressureless sintering at 1880℃ for 150 min, the maximum transmittance was ~76.5% (3 mm in thickness). It is 48.3% higher than that using AlON powder synthesized by low nucleation density powders. Therefore, for using α-Al2O3 as starting material to prepare AlON powder, high nucleation density is beneficial to AlON powder with small particle size and high sintering ability, which contributes to the high transmittance of AlON ceramics.

Key words: AlON, α-Al2O3;, nucleation density, activated charcoal powder, submicron carbon

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