کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1478006 | 991205 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Properties of silicon nitride for aluminum melts prepared by nitrided pressureless sintering
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
In this study, silicon nitride ceramics for aluminum melts were prepared by nitrided pressureless sintering (NPS) process, which process is the continuous process of nitridation reaction of Si metal combined with pressureless sintering. Mechanical, chemical and thermal properties of the NPS silicon nitride sintered with Al2O3, Y2O3 and Si additives were evaluated. Fully densed products show appropriate strength, â¼500 MPa, high hardness, â¼13 GPa, and superior damage tolerances with high fracture toughness, â¼9.8 MPa m1/2. Contact testing with spherical indenters is used to characterize the damage response. Examination of the indentation sites indicates a quasi-plastic damage modes are observed. Bend tests on specimens containing quasi-plastic contact damages reveal those materials to be not susceptible to strength degradation. And it has a low thermal expansion coefficient of 2.9 Ã 10â6 °C, and good thermal conductivity of 28 W/mK.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 28, Issue 5, 2008, Pages 1057-1063
Journal: Journal of the European Ceramic Society - Volume 28, Issue 5, 2008, Pages 1057-1063
نویسندگان
In-Sub Han, Doo-Won Seo, Sei-Young Kim, Ki-Seog Hong, Kil Ho Guahk, Kee Sung Lee,