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10.3390/ma16020606
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Article

Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property

by
Xin Li
1,*,
Shuxin Niu
1,
Dongsheng Wang
1,
Jie Li
2,
Qi Jiao
1,
Xinlong Guo
1 and
Xiqing Xu
2,*
1
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
2
School of Materials Science & Engineering, Chang’an University, Xi’an 710061, China
*
Authors to whom correspondence should be addressed.
Materials 2023, 16(2), 606; https://doi.org/10.3390/ma16020606
Submission received: 1 December 2022 / Revised: 1 January 2023 / Accepted: 5 January 2023 / Published: 8 January 2023
(This article belongs to the Special Issue Advanced Ceramic and Glass Materials: Preparation, Characterization and Applications)
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Abstract

Silica-based ceramic cores play key roles in the casting of aeroengine blades, but they are highly limited by the poor high-temperature mechanical property. Here, fused mullite (FM) and sintered mullite (SM) powders were modified in silica-based ceramic cores, and the microstructure evolution and crystallization kinetics of ceramic cores depending on mullite types were studied. The ceramic cores with FM showed a dense microstructure and superior mechanical properties compared to those with SM. The ceramic cores with 10 wt.% of FM showed a crystallization activation energy of 1119.5 kJ/mol and a crystallization exponent of 1.74, and the values of 938.4 kJ/mol and 1.86 as SM were employed; the decreased crystallization activation energy and the elevated crystallization exponent by SM suggested that the excess impurities of alkali oxides and alkaline-earth oxides significantly promoted the crystallization of cristobalite. Even though the ceramic cores with mullite powders decreased slightly in the room-temperature mechanical property, their high-temperature flexure strength and creep deformation resistance were enhanced. The ceramic cores with 10 wt.% of FM showed excellent comprehensive performance, with linear shrinkage of 0.69%, room-temperature strength of 18.9 MPa, and high-temperature strength of 15.5 MPa, which satisfied the demands for hollow-blade casting.
Keywords: ceramic cores; silica; mullite; crystallization kinetics; high-temperature property ceramic cores; silica; mullite; crystallization kinetics; high-temperature property

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MDPI and ACS Style

Li, X.; Niu, S.; Wang, D.; Li, J.; Jiao, Q.; Guo, X.; Xu, X. Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property. Materials 2023, 16, 606. https://doi.org/10.3390/ma16020606

AMA Style

Li X, Niu S, Wang D, Li J, Jiao Q, Guo X, Xu X. Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property. Materials. 2023; 16(2):606. https://doi.org/10.3390/ma16020606

Chicago/Turabian Style

Li, Xin, Shuxin Niu, Dongsheng Wang, Jie Li, Qi Jiao, Xinlong Guo, and Xiqing Xu. 2023. "Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property" Materials 16, no. 2: 606. https://doi.org/10.3390/ma16020606

APA Style

Li, X., Niu, S., Wang, D., Li, J., Jiao, Q., Guo, X., & Xu, X. (2023). Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property. Materials, 16(2), 606. https://doi.org/10.3390/ma16020606

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