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- Title
不同粒径熔融石英的析晶行为研究.
- Authors
杨绍文; 王庆虎; 张晓伟; 徐义彪; 梁雄; 李亚伟
- Abstract
In order to systematically study the crystallization rules of fused silica ceramics, fused silica particles with three different particle sizes (d50 = 660.82,42. 12, and 5.58 µm) were used as raw materials to prepare fused silica ceramics at 1 250 1 400 °C. The crystallization kinetics and crystallization processes were analyzed by the isothermal phase transition method and polarized light microscopy. The results show that with the decrease of the particle size, the crystallization activation energy of the fused silica ceramics gets lower, the crystallization onset temperature decreases continuously, and the crystallinity increases rap- idly, generating more larger microcracks. The analysis shows that because of the different mass transfer efficiency in the solid phase sintering process, the Si-O bond rearrangement can fully occur between smaller fused silica particles thus crystallization is more likely to occur. In addition, fused silica crystallization exhibits the surface nucleation mechanism: crystallization starts from the surface of the fused silica particles and then gradually spreads inwards.
- Publication
Refractories / Naihuo Cailiao, 2023, Vol 57, Issue 6, p484
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2023.06.005