Enhancement of the optical transmittance of hot-pressed transparent yttria ceramics by a multi-step sintering process
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- 作者：Lin Gan ; Young-Jo Park ; yjpark87@kims.re.kr" class="auth_mail" title="E-mail the corresponding author ; Lin-Lin Zhu ; Shin-Il Go ; Haneul Kim ; Jin-Myung Kim ; Jae-Woong Ko
- 关键词：Yttria ; Transparent ceramic ; Hot-pressing ; HIPing
- 刊名：Ceramics International
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：42
- 期：12
- 页码：13952-13959
- 全文大小：4470 K
文摘
In this work, we report the enhancement of the optical transmittance of yttria ceramics via a ‘pre-sintering/hot-pressing/hot-isostatic pressing’ multi-step process. The in-line transmittance reaches 78.0% at 400 nm and 83.2% at 1100 nm with an average grain size of approximately 1 µm. This sintering route is derived and upgraded from our previously reported one-step hot-pressing method for the fabrication of transparent yttria ceramics. Through the enhanced strength of the green body by pre-sintering, the formation of cracks and the breaking up of the as-hot-pressed samples can be effectively suppressed, leading to sound or crack-free but less transparent samples. After a post-HIPing treatment, the optical transmittance of the samples with a pre-sintering step was substantially improved to higher levels in the visible and the IR wavelengths compared to that of a sample which does not undergo pre-sintering. The corresponding mechanism was revealed by microstructural analyses.