کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1490395 | 992323 | 2012 | 6 صفحه PDF | دانلود رایگان |

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.
Figure optionsDownload as PowerPoint slideHighlights
► 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).
Journal: Materials Research Bulletin - Volume 47, Issue 9, September 2012, Pages 2469–2474