Mechanical and thermal properties of LaMgAl{sub 11}O{sub 19}

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.06.014· OSTI ID:22202839

Jiang, B. ^[1]; Huang, Z. H.; Liu, Y. G.; Peng, P.; Zhang, J. ^[1]

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1. School of Materials Science and Technology, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Beijing 100083 (China)

Lanthanum magnesium hexaaluminate (LaMgAl{sub 11}O{sub 19}) powders were synthesized successfully at 1300 {sup o}C for 4 h by solid-state reaction, and LaMgAl{sub 11}O{sub 19} ceramic was prepared at 1700 {sup o}C for 6 h by pressureless sintering. Phase composition, microstructure, mechanical and thermophysical properties of LaMgAl{sub 11}O{sub 19} ceramic were investigated. Results show that the flexural strength and fracture toughness of LaMgAl{sub 11}O{sub 19} ceramic are 353.3 {+-} 12.5 MPa and 4.60 {+-} 0.46 MPa m{sup 1/2}. Young's Modulus and Poisson ratio is 295 GPa and 0.23, respectively. The linear thermal expansion coefficient of LaMgAl{sub 11}O{sub 19} ceramic from 473 K to 1473 K is 9.17 x 10{sup -6}/K, and thermal conductivity at 1273 K is 2.55 W/m K.

• OSTI ID: 22202839
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 10 Vol. 45; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FLEXURAL STRENGTH
FRACTURE PROPERTIES
MICROSTRUCTURE
POISSON RATIO
SOLIDS
THERMAL CONDUCTIVITY
THERMAL EXPANSION
YOUNG MODULUS