ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Sintered bodies of highly sinterable calcium-doped lanthanum chromites with chromium deficiency have been found to deteriorate and form calcium chromate hydroxyl apatite on their surfaces when exposed to high-temperature water-containing atmospheres. Microstructure analysis, composition measurement, and phase identification were performed on the surface of the samples after annealing in various conditions. The mechanism of the surface deterioration is thus deduced: traces of liquid phase which are formed in the sintering process migrate to the external surface and then react with water vapour to yield an apatite-type compound. Electrical conductivity has also been measured. The poorly conductive nature of the surface will cause some problems when the subject materials are used as high-temperature electronic conductors.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00356836
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