کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1604396 1516007 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Properties of sintered alumina reinforced with niobium carbide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Properties of sintered alumina reinforced with niobium carbide
چکیده انگلیسی

The presence of carbide or nitride particles in Al2O3-based composites may produce a pinning effect and inhibit the grain growth of the matrix, which might significantly contribute to the final performance of the composite. Fracture toughness, mechanical strength and wear resistance have been particularly improved by the dispersion of hard particles.This work has the purpose to investigate the potential use of NbC as alumina reinforcing material, as an alternative to other carbides such as TiC, WC and (W, Ti)C.Alumina was mixed with a constant 30 wt.% of carbide in a ball mill, uniaxially hot-pressed at 1600 °C and 20 MPa in an inert atmosphere, and characterized. X-ray diffraction revealed that alumina and the added carbide were the only crystalline phases present and no oxidation products were detected. The increase in fracture toughness likely is the result of crack deflection, triggered by carbide particles at the alumina grain boundaries. The results obtained in this work show that alumina reinforced with NbC is a composite material with properties comparable to those of alumina reinforced with WC, TiC or (W, Ti)C, making NbC a good reinforcing material.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 27, Issue 2, March 2009, Pages 427–430
نویسندگان
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