Influence of Ammonium Polyacrylic Acid and Ammonium Citrate Dispersants on Transmittance of Yttrium Aluminum Garnet Ceramics
SI Wei1,2, DING Chao3, PAN Wei2
1 School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028; 2 State KeyLaboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084; 3 Dalian Environmental Monitoring Center, Dalian 116023
Abstract: 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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2018, Vol. 32 
