Abstract
Highly transparent aluminum oxynitride (AlON) ceramics were fabricated by pressureless sintering with hot isostatic pressing (HIP) post-treatment. The experimental results showed that the optical transparency of AlON ceramics was improved markedly over the visible and near-infrared range by HIP at 1825°C for 3h in 200MPa argon gas, which derived from the elimination of residual pores in the prepared ceramics. For AlON ceramics pre-sintered at 1800°C, the transmittances of the sample increased from 63.6% to 84.8% at 600nm and from 75.4% to 86.1% at 2000nm, respectively. The average grain size of the HIPed sample was about 47.9μm.
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