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Effect of silicone resin content on the properties of Al2O3-based ceramic cores
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1.School of Materials Science and Engineering,Shijiazhuang Tiedao University;2.State Key Laboratory of Advanced Special Steels,School of Materials Science and Engineering,Shanghai University

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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.

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[Yang Zhigang, Zhao Zhijia, Yu Jianbo, 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.]
DOI:10.12442/j. issn.1002-185X. QH20190023

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History
  • Received:March 14,2019
  • Revised:March 23,2019
  • Adopted:April 19,2019
  • Online: March 12,2020
  • Published: