Design of Sintered, Tough, Oxide Laminate and Fibrous Monolithic Composites
Kim, Dong-Kyu
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https://hdl.handle.net/2142/82712
Description
Title
Design of Sintered, Tough, Oxide Laminate and Fibrous Monolithic Composites
Author(s)
Kim, Dong-Kyu
Issue Date
2002
Doctoral Committee Chair(s)
Kriven, Waltraud M.
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
Tough, oxide, laminated and fibrous monolithic composites were fabricated by using tape casting and co-extrusion technique, respectively. Mullite (3Al 2O3·2SiO2), alumina (Al2O 3), 50 vol% alumina · 50 vol% YAG (yttrium aluminum garnet, Y 3Al5O12) in situ composite, 50 vol% alumina · 50 vol% mullite in situ composite, zirconia (ZrO 2), and nickel aluminate (NiAl2O4) were used as matrix materials. Aluminum phosphate (AlPO4), alumina platelets, and 50 vol% alumina · 50 vol% leucite (KAlSi2O6) were chosen as high temperature applicable interphase materials. ICP (Inductively coupled plasma) data indicated no extensive decomposition of AlPO4 heat treated at 1600 and 1800°C. The AlPO4 worked as a stable, porous, weak, crack deflecting interphase material with three point bending strength of 1.5 MPa and 61% of theoretical density after heat treatment at 1600°C for 10h. The 50 vol% alumina · 50 vol% YAG in situ composite had a bending strength of 361 MPa after sintering at the condition of 1700°C/5h. A : B (C) : D (E) bimodal designs were proposed to increase the toughness of the laminated composites. 1 : 5 (6) : 12 (1) bimodal laminated composite had a bending strength and a work of fracture of 142 MPa and 0.51 KJ/m2, respectively. Fibrous monolithic composites with different interphase thickness and interphase composition were fabricated. 2-, 3- and mixed-layer fibrous monolithic composites were made.
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