Effects of Borosilicate Glass on the Constrained Sintering of BaWO4
碩士 === 國立清華大學 === 材料科學工程學系 === 106 === The effects of borosilicate glass on the densification behavior of BaWO4 (BW) under constrained sintering have been studied. BW cannot be densified under constrained sintering at 950oC. Activation energy analysis shows that the densification mechanism of BW unde...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2018
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| Online Access: | http://ndltd.ncl.edu.tw/handle/mj53s3 |
| Summary: | 碩士 === 國立清華大學 === 材料科學工程學系 === 106 === The effects of borosilicate glass on the densification behavior of BaWO4 (BW) under constrained sintering have been studied. BW cannot be densified under constrained sintering at 950oC. Activation energy analysis shows that the densification mechanism of BW under constrained sintering has been changed. It results in a severe densification retardation of BW under constrained sintering. To solve this problem, we added borosilicate glass into BW, which forms borosilicate glass + BW (BWG) system. BWG system can be densified under constrained sintering at 950oC. Insignificant change in densification mechanism and isotropy in microstructure are observed during free and constrained sintering. The required uniaxial stress to densify BWG under constrained sintering at 750-900oC is in the range of 100-900 kPa, consistent with those calculated by using an isotropic viscous model. Activation energy analysis shows that the densification of BWG under constrained sintering is mainly achieved by the viscous flow of borosilicate glass and the rearrangement of BW particles.
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