聚丙烯酸铵和柠檬酸铵分散剂对钇铝石榴石陶瓷透光率的影响

司伟; 丁超; 潘伟

文章摘要

司伟,丁超,潘伟.聚丙烯酸铵和柠檬酸铵分散剂对钇铝石榴石陶瓷透光率的影响[J].材料导报,2018,32(8):1209-1212, 1240

聚丙烯酸铵和柠檬酸铵分散剂对钇铝石榴石陶瓷透光率的影响

Influence of Ammonium Polyacrylic Acid and Ammonium Citrate Dispersants on Transmittance of Yttrium Aluminum Garnet Ceramics

DOI：10.11896/j.issn.1005-023X.2018.08.001

中文关键词: 分散剂钇铝石榴石醇盐水解沉淀法透光率

英文关键词: dispersants, yttrium aluminum garnet, alkoxide hydrolysis precipitation method, transmittance

基金项目:国家自然科学基金(51308086)；辽宁省高等学校杰出青年学者成长计划(LJQ2015020)；大连市高层次人才创新支持计划(2016RQ051)

作者	单位
司伟	大连交通大学材料科学与工程学院,大连 116028 清华大学新型陶瓷与精细工艺国家重点实验室,北京 100084
丁超	大连市环境监测中心, 大连 116023
潘伟	清华大学新型陶瓷与精细工艺国家重点实验室,北京 100084

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中文摘要:

使用超声波-微波辅助的醇盐水解沉淀法合成了Y₃Al₅O₁₂(YAG)前驱体,加入烧结助剂及分散剂后真空烧结制备了YAG透明陶瓷,并对添加不同分散剂烧成的YAG透明陶瓷的晶相结构、微观形貌及光学性能进行了表征。结果表明:添加不同分散剂均可获得纯相YAG透明陶瓷；添加聚丙烯酸铵(NH₄PAA),晶粒之间没有明显的晶界,且气孔较大；添加柠檬酸铵(AC),晶粒分散良好,平均晶粒尺寸约为3 μm。未添加分散剂时,YAG透明陶瓷在近红外波段处透光率为76%；添加NH₄PAA时,透明陶瓷透光率较低,仅为51%；而添加AC后透明陶瓷透光率可达到78%。添加AC能够细化YAG透明陶瓷晶粒,促进残余气孔排出,从而使YAG透明陶瓷获得更高的透光率。

英文摘要:

Yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) transparent ceramics were prepared by vacuum sintering with the addition of sintering aids and dispersants into YAG precursor. The precursor of YAG was prepared via ultrasound-microwave-assisted alkoxide hydrolysis precipitation method. The crystal structures, morphology and optical properties of transparent YAG ceramics with the addition of different dispersant were investigated. The results showed that pure-phase transparent YAG ceramics could be obtained with the addition of all kinds of dispersants. By adding the ammonium polyacrylic acid (NH₄PAA), no obvious boundaries were formed between crystalline grains and large pores emerged. With the addition of ammonium citrate (AC), well-dispersed crystalline grains could be formed with the average size of about 3 μm. The transmittance in the near-infrared waveband of the transparent YAG ceramic was 76% without the addition of dispersants. However, with the addition of NH₄PAA, the transmittance of the transparent YAG ceramics was reduced to only 51%, and when adding AC it rose back to 78%. The result indicates that AC can refine the grain size of the transparent YAG ceramics and promote the removal of residual pores, thus contribute to the formation of transpa-rent YAG ceramics with higher transmittance.

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