Preparation of YAG nanopowder by different routes and evaluation of their characteristics including transparency after sintering

Journal of the Australian Ceramic Society - Tập 53 - Trang 751-760 - 2017
K. Sarath Chandra1, Monali Monalisa1, Georgekutty Ulahannan1, Debasish Sarkar1, Himadri Sekhar Maiti2
1Department of Ceramic Engineering, National Institute of Technology, Rourkela, India
2Govt. College of Engineering and Ceramic Technology, Kolkata, India

Tóm tắt

Yttrium aluminium garnet (YAG) nanopowder has been synthesized by five different routes: three of them are co-precipitation with different combinations of aluminium and yttrium sources as well as the precipitating agents, and the rest are by solid state synthesis with certain variation. They are designated as: process-1 (Al-nitrate, yttria, HNO3, NH4HCO3), process-2 (Al-nitrate, Y-nitrate, NH4HCO3), process-3 (Al-nitrate, Y-nitrate, NH4OH,), process-4 (Al-nitrate and Y-nitrate heated to 1000 °C), and process-5 (alpha-alumina and yttria heated to 1100 °C). Of them, process-2 develops the highest surface area (31 m2/g), soft agglomerated and near spherical crystalline YAG nanopowders through minimum mass loss, and excellent cation homogeneity. Pseudo solid state reaction between aluminium nitrate/yttrium nitrate (process-4) and solid state reaction of alumina/yttria (process-5) requires high-calcination temperature and results in hard agglomerates. In most cases, highly crystalline YAG is formed together with the formation of an intermediate metastable phase of YAP. Powder prepared by process-2 leads to 99.6% dense and 60% transparent YAG ceramics on hot isostatic pressing.

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Thông tin xuất bản

Journal of the Australian Ceramic Society

Tập 53

751-760

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