Abstract The porous SiC scaffolds were prepared by freeze casting, and then the porous scaffolds were impregnated and cracked by liquid polycarbosilane (LPVCS) to prepared SiC ceramics. The effects of the number of immersion cracking cycles on the density, porosity, microstructure and bending strength of SiC flexural were studied. The results show that, the porous SiC scaffolds formed by freeze casting are oriented porous dendrites. The density, porosity and flexural strength of the scaffolds are 0.45 g/cm3, 87.7% and 8.53 MPa, respectively. The density, porosity and flexural strength of SiC composites are 2.08 g/cm3, 5.9%, and 157.43 MPa, respectively. SiC ceramic material with lower density and good flexural strength can be otained by this method.
HUANG Yujuan,XIONG Huiwen,ZOU Jinzhu, et al. Structure and properties of SiC ceramics prepared by dip cracking method based on oriented porous SiC[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 133-139.
[1] 张秋平. 国外高超声速飞行器耐高温非金属结构材料研究现状[J]. 飞航导弹, 2011(11): 92-95. ZHANG Qiuping.Research status of high-temperature non- metal structure materials for foreign hypersonic vehicles[J]. Aeronautical Missiles, 2011(11): 92-95. [2] LEVINE S R, OPILLA E J, HALBIG M C, et a1. Evaluation of ultra-high temperature ceramics foraeropropulsion use[J]. Journal of the European Ceramic Society, 2002, 22(14/15): 2757-2767. [3] 韩杰才, 胡平, 张幸红, 等. 超高温材料的研究进展[J]. 固体火箭技术, 2005(4): 289-294. HAN Jiecai, HU Ping, ZHANG Xinghong, et al.Advanced on ultra-high temperatur materials[J]. Solid Rocket Technology, 2005(4): 289-294. [4] NALAIN R.Design, preparation and properties of non-oxide CMCs for application in engines and nuclear reactors: An overview[J]. Composites Sicence and Technology, 2004, 64(2): 155-170. [5] KATOH Y, SNEAD L L, HENAGER C H, et al. Current status and critical issues for development of SiC composites for fusion applications[J]. Journal of Materials, 2007, 367/370(Part PA): 659-671. [6] SCHAAFHAUSEN S, YAZHENSKIKH E, HEIDENREICH S, et al.Corrosion of silicon carbide hot gas filter candles in gasification environment[J]. Journal of the European Ceramic Society, 2014, 34(3): 575-588. [7] 赵爽. PIP工艺制备SiC/SiC复合材料的结构、性能与辐照行为研究[D]. 长沙: 国防科学技术大学, 2013: 35-52. ZHAO Shuang.Microstructure, performance and irradiation behavior of PIP-SiC/SiC composites[D]. Changsha: National University of Defense Technology, 2013: 35-52. [8] LI M, YANG D, WANG H, et al.Property evolvements in SiCf/SiC composites fabricated by combination of PIP and electrophoretic deposition at different pyrolysis temperatures[J]. Ceramics International, 2019, 45(12): 15689-15695. [9] MU Y, ZHOU W, WANG H, et al.Mechanical and dielectric properties of 2.5D SiCf/SiC-Al2O3 composites prepared via precursor infiltration and pyrolysis[J]. Materials Science and Engineering A, 2014, 596: 64-70. [10] DEVILLE S, SAIZ E, NALLA R K, et al.Freezing as a path to build complex composites[J]. Science, 2006, 311(5760): 515-518. [11] MUNCH E, LAUNEY M E, ALSEM D H, et al.Tough, bio-inspired hybrid materials[J]. Science, 2008, 322(5907): 1516-1520. [12] ZHANG H, DANGELO N P, WILHELM M, et al.Hierarchically ordered micro/meso/macroporous polymer- derived ceramic monoliths fabricated by freeze-casting[J]. Journal of the European Ceramic Society, 2016, 36(1): 51-58. [13] CHENG Q, HUANG C, TOMSIA A P.Freeze casting for assembling bioinspired structural materials[J]. Adv Mater, 2017, 29(45): 1703155-1703165. [14] 张妍. 定向多孔HA/BT复合生物陶瓷的制备、调控及性能研究[D]. 长沙: 中南大学, 2013: 9-23. ZHANG Yan.Fabrication, manipulation and property of HA/BT biocomposites with aligned porous structure[D]. Changsha: Central South University, 2013: 9-23. [15] YOON B H, LEE E J, KIM H E, et al.Highly aligned porous silicon carbide ceramics by freezing polycarbosilane/camphene solution[J]. Journal of the American Ceramic Society, 2007, 90(6): 1753-1759. [16] NAVIROJ M, MILLER S M, COLOMBO P, et al.Directionally aligned macroporous SiOC via freeze casting of preceramic polymers[J], Journal of the European Ceramic Society, 2015, 35(8): 2225-2232. [17] NAGLIERI V, GLUDOVATZ B, TOMSIA A P, et al.Developing strength and toughness in bio-inspired silicon carbide hybrid materials containing a compliant phase[J]. Acta Materialia, 2015, 98: 141-151. [18] COLOMBO P, MERA G, RIEDEL R, Polymer-derivedd ceramics: 40 years of Research and Innovation in Advanced Ceramics[J]. Journal of the American Ceramic Society, 2010, 93(7): 1805-1837. [19] 罗征, 周新贵, 余金山, 等. 以新型先驱体浸渍裂解制备SiC/SiC复合材料弯曲性能研究[J]. 稀有金属材料与工程, 2013, 42(S1): 377-379. LUO Zheng, ZHOU Xingui, YU Jinshan, et al.Fabraiction of SiC/SiC composites by improved PIP processing with a new precusor polymers[J]. Rare Metal Materials and Engineering, 2013, 42(S1): 377-379. [20] XUE F, ZHOU K, WU N, et al.Porous SiC ceramics with dendritic pore structures by freeze casting from chemical cross- linked polycarbosilane[J]. Ceramics International, 2018, 44(6): 6293-6299. [21] EOM J H, KIM Y W, RAJU S.Processing and properties of macroporous silicon carbide ceramics: A review[J]. Journal of Asian Ceramic Societies, 2018, 1(3): 220-242. [22] 陈朝辉. 先驱体转化陶瓷基复合材料[M]. 北京: 科学出版社, 2015: 96-103. CHEN Zhaohui.Precursor Transformation Ceramic Matrix Composite[M]. Beijing: Science Press, 2015: 96-103.
2020, Vol. 25 
