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Title: Enhancement of thermal shock resistance of reaction sintered mullite–zirconia composites in the presence of lanthanum oxide

Abstract

Mullite–zirconia composites containing 20 wt.% zirconia were prepared by reaction sintering of zircon flour, sillimanite beach sand and calcined alumina. 0 to 8 mol% of La{sub 2}O{sub 3} with respect to zirconia was used as sintering aid. The effect of additive on the various physical, microstructures, mechanical and thermo-mechanical properties was studied. Quantitative phase analysis shows the change in tetragonal zirconia content with incorporation of lanthanum oxide. La{sub 2}O{sub 3} addition has significantly improved the thermal shock resistance of the samples. Samples without additive retained only 20% of initial flexural strength after 5 cycles, whereas samples containing 5 mol% La{sub 2}O{sub 3} retained almost 78% of its initial flexural strength even after 15 thermal shock cycles. - Highlights: • Mullite–zirconia composites were prepared by reaction sintering route utilizing zircon and sillimanite beach sand. • Lanthanum oxide was used as sintering aid. • The presence of lanthanum oxide decreased the densification temperature. • Lanthanum oxide significantly improved the thermal shock resistance of the composites.

Authors:
; ; ;
Publication Date:
OSTI Identifier:
22476048
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 101; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; COMPOSITE MATERIALS; FLEXURAL STRENGTH; LANTHANUM OXIDES; MICROSTRUCTURE; MULLITE; PHASE STUDIES; SAND; SINTERING; THERMAL SHOCK; ZIRCON; ZIRCONIUM OXIDES

Citation Formats

Kumar, P., Nath, M., Ghosh, A., and Tripathi, H.S., E-mail: hstripathi@cgcri.res.in. Enhancement of thermal shock resistance of reaction sintered mullite–zirconia composites in the presence of lanthanum oxide. United States: N. p., 2015. Web. doi:10.1016/J.MATCHAR.2015.01.004.
Kumar, P., Nath, M., Ghosh, A., & Tripathi, H.S., E-mail: hstripathi@cgcri.res.in. Enhancement of thermal shock resistance of reaction sintered mullite–zirconia composites in the presence of lanthanum oxide. United States. doi:10.1016/J.MATCHAR.2015.01.004.
Kumar, P., Nath, M., Ghosh, A., and Tripathi, H.S., E-mail: hstripathi@cgcri.res.in. Sun . "Enhancement of thermal shock resistance of reaction sintered mullite–zirconia composites in the presence of lanthanum oxide". United States. doi:10.1016/J.MATCHAR.2015.01.004.
@article{osti_22476048,
title = {Enhancement of thermal shock resistance of reaction sintered mullite–zirconia composites in the presence of lanthanum oxide},
author = {Kumar, P. and Nath, M. and Ghosh, A. and Tripathi, H.S., E-mail: hstripathi@cgcri.res.in},
abstractNote = {Mullite–zirconia composites containing 20 wt.% zirconia were prepared by reaction sintering of zircon flour, sillimanite beach sand and calcined alumina. 0 to 8 mol% of La{sub 2}O{sub 3} with respect to zirconia was used as sintering aid. The effect of additive on the various physical, microstructures, mechanical and thermo-mechanical properties was studied. Quantitative phase analysis shows the change in tetragonal zirconia content with incorporation of lanthanum oxide. La{sub 2}O{sub 3} addition has significantly improved the thermal shock resistance of the samples. Samples without additive retained only 20% of initial flexural strength after 5 cycles, whereas samples containing 5 mol% La{sub 2}O{sub 3} retained almost 78% of its initial flexural strength even after 15 thermal shock cycles. - Highlights: • Mullite–zirconia composites were prepared by reaction sintering route utilizing zircon and sillimanite beach sand. • Lanthanum oxide was used as sintering aid. • The presence of lanthanum oxide decreased the densification temperature. • Lanthanum oxide significantly improved the thermal shock resistance of the composites.},
doi = {10.1016/J.MATCHAR.2015.01.004},
journal = {Materials Characterization},
number = ,
volume = 101,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}