کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1474783 991100 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tailoring the microstructure of reaction-sintered alumina/lanthanum hexaaluminate particulate composites
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Tailoring the microstructure of reaction-sintered alumina/lanthanum hexaaluminate particulate composites
چکیده انگلیسی

The aim of this study was modification of the microstructure and adjustment of the porosity in alumina/lanthanum hexaaluminate particulate composites, by altering the lanthanum hexaaluminate content, for the further development of new materials that can be applied in several technological processes. The amount of lanthanum hexaaluminate was varied from 2.8 to 80 vol.% in particulate composites. As a novel approach to develop homogenously distributed dense and porous alumina/lanthanum hexaaluminate particulate composites, a carbonate co-precipitation method was applied to produce lanthanum aluminate-coated alumina particles. For the coating process itself, a surface charge adjustment called ‘electrostatic attraction’ was utilised. Subsequent reactive sintering of the calcined-coated particles caused the in situ formation of lanthanum hexaaluminate platelets inside the alumina matrix. The prepared composite powders, as well as the sintered samples, were characterised by FE-SEM, TEM, XRD, dilatometry, and mercury porosimetry. The results revealed that the uniform distribution of the low amount of lanthanum hexaaluminate prohibited the grain growth of alumina matrix and resulted in denser microstructures, whereas the increase in the lanthanum hexaaluminate content yielded more porous microstructures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 30, Issue 6, April 2010, Pages 1381–1389
نویسندگان
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