کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7898019 | 1510131 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fabrication and wear behaviors of graded Si3N4 ceramics by the combination of two-step sintering and β-Si3N4 seeds
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Graded Si3N4 ceramics with sandwich-like microstructure were fabricated by the combination of hot-pressing, spark plasma sintering and β-Si3N4 seeds. Phase compositions, microstructures, mechanical properties, and wear behaviors were investigated. Main α-Si3N4 phase were detected in the outer layers, and only β-Si3N4 phase were observed in the inner layers. The outer layer with ultra-fine equiaxed grains were well bonded to the inner layer with a distinct bimodal grain size distribution. Vickers hardness of outer layer (â¼21.2â¯GPa) was much higher than that of inner layer (â¼16.1â¯GPa), whereas fracture toughness of outer layer (â¼3.5â¯MPaâ¯m1/2) was much lower than that of inner layer (â¼5.9â¯MPaâ¯m1/2), indicative of the hard surface and tough core. Due to the ultra-fine microstructure and high hardness of outer layer, the graded Si3N4 ceramics exhibited superior wear resistance with low wear rate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 10, August 2018, Pages 3457-3462
Journal: Journal of the European Ceramic Society - Volume 38, Issue 10, August 2018, Pages 3457-3462
نویسندگان
Jun-Jie Yu, Wei-Ming Guo, Wan-Xin Wei, Hua-Tay Lin, Cheng-Yong Wang,