| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Effect of Fused Silica Spherical Particles on Shrinkage Properties of Ceramic Cores |
| WANG Lili, YAO Jiansheng, XU Liang, YANG Xiaowei, GU Guohong, LI Xin, NIU Shuxin
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| Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095 |
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Abstract Ceramic cores with fused silica spherical particles were prepared by injection molding. Compared with the comminuted particles, the effects of fused silica spherical particles on sintering shrinkage at 1 200 ℃ and 1 500 ℃ were investigated by SEM and XRD. The results showed that the ceramic cores with 100% fused silica spherical particles had a smaller sintering shrinkage at 1 200 ℃ than cores with 100% fused silica comminuted particles when the particle size distributions of fused silica were similar. When the proportion of raw materials (not include spherical particles) was constant, adding spherical particles could inhibit the sintering at 1 200 ℃ of SiO2-ZrSiO4 and SiO2-Al2O3 ceramic cores, and the decreases of sintering shrinkage varied with the increasing amount of spherical particles. The native reaction of spherical particles on ceramic sintering is likely to relate to the residual quartz phase in spherical particles and the transformation to cristoballite phase. The additive of spherical particles had no significant influence with the further shrinkage at 1 500 ℃ of silica based ceramic cores.
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Published: 19 June 2019
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| About author:: Lili Wangreceived her Ph.D. degree in materials scie-nce and engineering from the University of Science and Technology Beijing (USTB) in Jan. 2013. She is currently a senior engineer and engages in the research of investment casting technology in AECC Beijing Institute of Aeronautical Materials, carries out the research on ceramic cores for directional solidification of turbine blades and interfacial reaction of superalloy/ceramic materials. SHe has published more than 10 journal papers as the first author, applied 4 national invention patents. |
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2019, Vol. 33 
