کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1584466 1514903 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of AGG on fracture toughness of tungsten carbide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Effects of AGG on fracture toughness of tungsten carbide
چکیده انگلیسی
The cobalt-bonded tungsten carbide has been regarded as a specific success in improving the fracture toughness of ceramics. However, the metal binder phase lowers the hardness and corrosion resistance of the composite and limits its applications. In this paper, the possibility of in situ-toughening tungsten carbide, making use of abnormal grain growth of WC grains to reinforce WC-Co composites, is investigated. The volume fraction of abnormally large grains in the samples is controlled by tailoring compositions and sintering conditions. The fracture toughness of the samples is evaluated using the indentation technique. The experiment results show that the fracture toughness of the sample could be improved by introducing a certain volume fraction of abnormal grains, but at some expense of the hardness. The highest value of fracture toughness, 7.34 MPa m0.5, is achieved for WC-0.5 wt% Co-0.25 wt% VC sintered at 2000 °C for 4 h. The main mechanisms for the improved toughness are cutting elongated grains, crack bridging and crack deflection, which could resist crack growth in the sample. Therefore, it is possible to in situ-toughen tungsten carbide using the abnormal grain growth of WC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volumes 445–446, 15 February 2007, Pages 587-592
نویسندگان
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