Fabrication of highly transparent AlON ceramics by hot isostatic pressing post-treatment

摘要

Highly transparent aluminum oxynitride (AION) ceramics were fabricated by pressureless sintering with hot isostatic pressing (HIP) post-treatment. The experimental results showed that the optical transparency of AION ceramics was improved markedly over the visible and near-infrared range by HIP at 1825 degrees C for 3 h in 200 MPa argon gas, which derived from the elimination of residual pores in the prepared ceramics. For AlON ceramics pre-sintered at 1800 degrees C, the transmittances of the sample increased from 63.6% to 84.8% at 600 nm and from 75.4% to 86.1% at 2000 nm, respectively. The average grain size of the HIPed sample was about 47.9 mu m. (C) 2017 Elsevier Ltd. All rights reserved.