Preparation of YAG gel coated ZrB2–SiC composite prepared by gelcasting and pressureless sintering |
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| Affiliation: | 1. Center for Crystal Science and Technology, University of Yamanashi, Miyamae-cho 7-32, Kofu 400-8511, Japan;2. Department of Material and Energy Science, Graduate School of Environmental Science, Okayama University, Tsusima-Naka 3-3-1, Okayama 700-8530, Japan;3. Graduate School of Science, Hiroshima University, Kagimiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan;1. Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;2. Department of Chemistry and Materials Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. College of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China;3. School of Civil and Mechanical Engineering, Curtin University, Perth, WA 6845, Australia;4. Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | In this paper, gelcasting and pressureless sintering of YAG gel coated ZrB2–SiC (YZS) composite were conducted. YAG gel coated ZrB2–SiC (YZS) suspension was firstly prepared through sol–gel route. Poly (acrylic acid) was used as dispersant. YZS suspension had the lowest viscosity when using 0.6 wt.% PAA as dispersant. Gelcasting was conducted based on AM–MBAM system. The gelcast YZS sample was then pressureless sintered to about 97% density. During sintering, YAG promoted the densification process from solid state sintering to liquid phase sintering. The average grain sizes of ZrB2 and SiC in the YZS composite were 3.8 and 1.3 μm, respectively. The flexural strength, fracture toughness and microhardness were 375 ± 37 MPa, 4.13 ± 0.45 MPa m1/2 and 14.1 ± 0.5 GPa, respectively. |
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| Keywords: | A Ceramic–matrix composites (CMCs) B Mechanical properties B Microstructure E Sintering |
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