کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1473176 991031 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Systematic study on densification of alumina fine powder during milliwave sintering at 28 GHz
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Systematic study on densification of alumina fine powder during milliwave sintering at 28 GHz
چکیده انگلیسی

Pure ultrafine alumina powder (0.2 μm average grain size (GS)) was sintered with a 28 GHz millimeter-wave radiation source by systematically varying sintering temperature (ST), holding time (HT), and heating rate (HR). Densification, microstructure and grain growth effects were analyzed after millimeter-wave sintering (MMWS). Alumina compacts were densified under rapid heating at 1100 °C without any HT up to 96% TD by retaining sub-micrometric GS (∼0.4 μm) and homogeneous microstructure. The ST was increased to 1200 °C (without HT, 50 °C/min HR) to achieve densification up to 98.6% TD, however, at the expense of an increased GS of ∼2 μm. Microstructure was maintained uniform throughout the sample even under extremely fast firing conditions of 200 °C/min HR except for the case in which HT was changed. Remarkable grain growth was observed when either ST or HT increased above the reference values.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Ceramic Societies - Volume 2, Issue 3, September 2014, Pages 215–222
نویسندگان
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