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杨治刚,赵志佳,余建波,任忠鸣.硅树脂添加量对氧化铝基陶瓷型芯性能影响研究[J].稀有金属材料与工程(英文),2020,49(2):515~519.[Yang Zhigang,Zhao Zhijia,Yu Jianbo and Ren Zhongming.Effect of silicone resin content on the properties of Al2O3-based ceramic cores[J].Rare Metal Materials and Engineering,2020,49(2):515~519.]
Effect of silicone resin content on the properties of Al2O3-based ceramic cores
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Received:March 14, 2019  Revised:March 23, 2019
DOI:
Key words: Al2O3-based ceramic cores  silicone resin  linear shrinkage rate  pressureless sintering
Foundation item:国家自然科学基金重点项目(U1560202, 51690162); 省部共建高品质特殊钢冶金与制备国家重点实验室开放课题(SKLASS 2017-03)资助和本项研究工作得到了上海市科学技术委员会的资助,编号为15DZ2260100及YDZX20173100001316专项。
Author NameAffiliation
Yang Zhigang,Zhao Zhijia,Yu Jianbo and Ren Zhongming  
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Abstract:
      Al2O3-based ceramic cores were prepared by dry-pressing and subsequent pressureless sintering, where the Al2O3 powders were used as the matrix and the silicone resin powders were used as the binder. The effect of the silicone resin content on the properties of Al2O3-based ceramic cores was investigated. Results showed that the new mullite phase was formed by the reaction between Al2O3 and silica which was formed by the decomposition of silicone resin. Weight loss of sintered Al2O3-based ceramic cores was mainly caused owing to the release of gases during the cross-linking and decomposition process of silicone resin. And the release of gases inhibited the shrinkage caused by the sintering drive force. Therefore, with the increase of silicone resin content, more and more gases were released. As a result, the weight loss of Al2O3-based ceramic cores gradually increased and the shrinkage rate gradually decreased. The increasing silicone resin content made the apparent porosity increase and the bulk-density decrease, leading to the decrease of bending strength in sintered Al2O3-based ceramic cores. Although the addition of silicone resin decreased the bending strength, the dimensional precision was improved markedly.