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Study on the Strength of Short Carbon Fiber-Reinforced Silicon Sol Shells for the Investment Casting Process

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Abstract

Short carbon fibers are used to improve the performance of investment casting shells by mixing short-cut carbon fibers with the silica sol slurries. The influence of fiber length and content on the flexural strength and deformation under weight of fiber-reinforced shells at elevated and normal temperatures and after firing was investigated. The fractures of the shells were observed by SEM. When the carbon fiber content increased from 0.2 to 1%, the bending strength of the shell at room temperature increased significantly compared to the specimens without fibers. The Green strength of the shell reached up to 3.180 MPa, for a carbon fiber content of 0.6% and a length of 4 mm, which was 38.5% higher than that of the specimen without fibers. When the fiber content was 1%, the flexural strength of the specimen at normal temperature was 22.45% higher than that of the unreinforced specimens, and the deformation underweight at elevated temperature was reduced about 14.32%. The strength of the composite shell was increased by 24.22% after roasting after the carbon fiber reinforcing. The SEM observation and analysis revealed that the failure of the fiber-reinforced silica sol shell has a strong influence on the tensile fracture and debonding of the carbon fibers.

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Acknowledgements

This project is supported by National Natural Science Foundation of China (Grant No. 51865042) and Inner Mongolia University of technology Foundation (Grant No. 2018203).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Zongxue Li, Xiangdong Liu & Kai Lv

  2. Key Laboratory of Materials Processing and Control Engineering of Inner Mongolia Autonomous Region, Hohhot, China

    Zongxue Li, Xiangdong Liu & Kai Lv

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  1. Zongxue Li
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  2. Xiangdong Liu
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Correspondence to Zongxue Li.

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Li, Z., Liu, X. & Lv, K. Study on the Strength of Short Carbon Fiber-Reinforced Silicon Sol Shells for the Investment Casting Process. Inter Metalcast 14, 432–441 (2020). https://doi.org/10.1007/s40962-019-00362-9

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