Effects of Al2O3-RE2O3 additive for the sintering of SiC and the Fabrication of SiCf/SiC composites

Title
Effects of Al2O3-RE2O3 additive for the sintering of SiC and the Fabrication of SiCf/SiC composites
Author(s)
윤당혁유현우카티라주박지연[박지연]
Keywords
Additive systems; Electrophoretic depositions; Fiber-reinforced; Matrix phase; Rare earth oxide; Sintering additives; Sintering behaviors; Ultrasonic pulse; Additives; Aluminum; Composite materials; Deposition; Dysprosium; Dysprosium compounds; Electrophoresis; Hot pressing; Infiltration; Neodymium; Sintering; Ytterbium; Silicon carbide; Additives; Aluminum; Composites; Deposition; Electrophoresis; Hot Pressing; Infiltration; Neodymium; Silicon Carbide; Sintering
Issue Date
201311
Citation
Journal of the Korean Ceramic Society, v.50, no.6, pp.364 - 371
Abstract
The sintering behavior of monolithic SiC is examined using the binary sintering additive of Al2O3-rare earth oxide (RE 2O3, where RE = Sc, Nd, Dy, Ho, or Yb). Through hot pressing at 20 MPa and 1750��C for 1 h in an Ar atmosphere for 52 nm fine ��-SiC powder added with 5 wt% sintering additive, a SiC density of > 97% is achieved, which indicates the effectiveness of Al2O 3-RE2O3 system as a sintering of additive for SiC. Based on this result, 7 wt% of Al2O3-Sc 2O3 is tested as an additive system for the fabrication of a continuous SiC fiber-reinforced SiC-matrix composite (SiCf/SiC). Electrophoretic deposition combined with the application of ultrasonic pulses is used to efficiently infiltrate the matrix phase into the voids of Tyranno��-SA3 fabric. After hot pressing, a composite density of > 97% is obtained, along with a maximum flexural strength of 443 MPa. ? 2013 The Korean Ceramic Society.
URI
http://hdl.handle.net/YU.REPOSITORY/28438http://dx.doi.org/10.4191/kcers.2013.50.6.364
ISSN
1229-7801
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공과대학 > 신소재공학부 > Articles
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