Microstructure and Performance of Fused Silica-Based Ceramic Core Reinforced by Mullite Fiber

Xin Li; Jian Sheng Yao; Xiao Guang Liu; Hong Na Fan; Shu Xin Niu

doi:10.4028/www.scientific.net/MSF.848.228

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HomeMaterials Science ForumMaterials Science Forum Vol. 848Microstructure and Performance of Fused...

Microstructure and Performance of Fused Silica-Based Ceramic Core Reinforced by Mullite Fiber

Abstract:

Fused silica-based ceramics are often used as sacrificial cores in investment castings to produce hollow, precise, and complex-shaped blades. In this work, the content of mullite fiber and its effects on mechanical and dimension behavior of silica-based ceramic cores were investigated. In order to simulate the single crystal blades casting process, the sintered samples were also heated up to 1540°C and kept for 0.5 h. Flexural strength test at 1540°Cwas carried out for the samples. The shrinkage, creep behavior and erode behavior were characterized. The results showed that in the premise of maintaining strength of materials, mullite fiber could decrease significantly the shrinkage. Many gains appeared on the surface of fiber after creep test of the core samples at 1540°C.

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Periodical:

Materials Science Forum (Volume 848)

Pages:

228-232

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.848.228

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Online since:

March 2016

Authors:

Xin Li, Jian Sheng Yao, Xiao Guang Liu, Hong Na Fan, Shu Xin Niu

Keywords:

Investment Castings, Mullite Fiber, Shrinkage, Silica-Based Ceramic Cores

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