کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10629485 | 991065 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Functionally graded ceramics by a new in situ processing route: Residual stress and wear resistance
ترجمه فارسی عنوان
سرامیک درجه بندی شده عملکردی با یک روش پردازش جدید در محل: تنش باقی مانده و مقاومت در برابر سایش
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
A new in situ method of producing ceramic functionally graded materials (FGMs) with continuously changing microstructure by pressureless sintering in combination with chemical reactions and evaporation is reported. Solid solutions of Fe2O3 in Al2O3 were first sintered in air and then reduction aged in 4Â vol% H2/N2. Metallic Fe formed near the surface and was able to evaporate, producing a surface layer with graded composition. The thermal expansion mismatch led to compressive residual stresses in the surface region of â¼500Â MPa and the graded structure avoided delamination. The abrasive wear resistance of the FGM ceramics was improved by a factor of 5 times compared with monolithic alumina. The improvement was attributed to the suppression of crack propagation normal to the surface by the compressive surface stresses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 35, Issue 9, September 2015, Pages 2693-2698
Journal: Journal of the European Ceramic Society - Volume 35, Issue 9, September 2015, Pages 2693-2698
نویسندگان
Chen Xu, Richard I. Todd,