ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
We have been trying to find new oxide compounds with large thermalexpansion coefficients and low thermal conductivities by means of a materialcalculation technique. Among thousands of compounds in the databases, we found thatthere were some materials with low thermal conductivities and large thermal expansioncoefficients in the group of strontium-niobium oxides. For example, Sr4Nb2O9 has athermal expansion coefficient of 14.5[removed info]10-6 /[removed info] and thermal conductivity of 1.0 W/mK,although a slight amount of other phases appear during long-term annealing. Thesethermal properties are better than those of yttria-stabilized zirconia, which is thestandard material for thermal barrier coatings. To prevent the precipitation of otherphases, we prepared the solid solutions, Sr4Nb2-xMxO9. In this study, the thermalconductivities and thermal expansion coefficients of these solid solutions weremeasured, and their thermal stabilities were evaluated by long-term annealing
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.517.pdf
Permalink
