کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1490395 992323 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dispersion and reaction sintering of alumina–titania mixtures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Dispersion and reaction sintering of alumina–titania mixtures
چکیده انگلیسی

Alumina–aluminium titanate (A–AT) composites are typically produced either by mixing the alumina matrix powder with already formed aluminium titanate or by reaction sintering of alumina and titania powders. Reaction-sintered materials usually exhibit limited final density and extensive microcracking. This paper describes the preparation of A–AT nanocomposites by slip casting and reaction sintering, using aqueous suspensions of submicrometre-sized alumina and nanometre-sized titania at a respective weight ratio of 87:13, which is typical for plasma-sprayed coatings. The colloidal stability of aqueous suspensions of the two individual powders and of their respective mixtures was determined first, measuring zeta potential and rheological behaviour as a function of deflocculant content and sonication time. The bimodal distribution yielded green relative densities of up to 70% of theoretical density. Dynamic and static sintering studies showed that aluminium titanate had already formed at 1400 °C.

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► Low viscosity suspensions with low thixotropy were prepared to a final solids loading of 55 vol.%.
► The bimodal distribution led to green relative densities of up to 70% of theoretical density.
► Reaction sintering of submicrometre-sized alumina and nanometre-sized titania (87:13).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 47, Issue 9, September 2012, Pages 2469–2474
نویسندگان
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