Properties of SiCf/SiC composites fabricated by slurry infiltration and hot pressing

Title
Properties of SiCf/SiC composites fabricated by slurry infiltration and hot pressing
Author(s)
파린둥안 요나탄[파린둥안 요나탄]이종현[이종현]김현태윤당혁
Keywords
TYRANNO-SA FIBER; SIC/SIC COMPOSITES; THERMAL-PROPERTIES; 2D; MICROSTRUCTURE; SILICON
Issue Date
201101
Publisher
MANEY PUBLISHING
Citation
MATERIALS SCIENCE AND TECHNOLOGY, v.27, no.1, pp.257 - 263
Abstract
Two-dimensional SiC fibre reinforced SiC ceramic matrix composites (SiCf/SiC) were fabricated by vacuum infiltration and hot pressing using a 200 nm thick pyrolytic carbon coated Tyranno SA3 fabric and 50 nm sized beta-SiC powder. Hot pressing was carried out at 1750 degrees C for 3 h in an Ar atmosphere under a pressure of 20 MPa. Al2O3-Y2O3-MgO sintering additive (10 wt-%) and polyvinyl butyral resin (45 wt-%) with respect to the matrix SiC were found to be the optimum contents for the high density composite. Vacuum infiltration with a force gradient produced much higher amount of slurry infiltration than simple dipping. Much improved density of 3.02 g cm(-3), compared to the previous reports, was achieved for the SiC-SiCf containing approximately 67 vol.-% of fibre. This composite showed a step increase with a stress-displacement behaviour during the three-point bending test due to the fibre reinforcement. The displacement for failure and flexural strength were 0.58 mm and 342 MPa respectively, which were much larger than those for monolithic SiC.
URI
http://hdl.handle.net/YU.REPOSITORY/25748http://dx.doi.org/10.1179/174328409X453172
ISSN
0267-0836
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공과대학 > 신소재공학부 > Articles
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