کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1604136 1516005 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of binder compositions on microstructure, hardness and magnetic properties of (Ta,Nb)C–Co and (Ta,Nb)C–Ni cemented carbides
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effect of binder compositions on microstructure, hardness and magnetic properties of (Ta,Nb)C–Co and (Ta,Nb)C–Ni cemented carbides
چکیده انگلیسی

Fabrication by powder technology routes, as well as microstructure characterization and measurement of hardness and magnetic properties of two types of (Ta,Nb)C sintered carbides having different composition of Ni and Co binders were carried out in the present study. Each carbide binder composition mixer was cold pressed in a uniaxial direction die at 400 MPa followed by vacuum sintering at 1450 °C. Nearly full dense (Ta,Nb)C sintered carbides with a relative density between 99.5% and 99.8% were obtained. The highest macrohardness values were observed for composition of (Ta,Nb)C–5 wt%Co and (Ta,Nb)C–5 wt%Ni of 1400 HV and 1300 HV respectively. The magnetic B–H hysteresis loops were measured at 0.8 T by the VSM method. In the case of (Ta,Nb)C–Co, higher magnetic saturation values of 47 emu/g were obtained for (Ta,Nb)C–30 wt%Co and 13.5 emu/g for (Ta,Nb)C–5 wt%Co. However, the magnetic saturation values for the prepared carbide having a composition of (Ta,Nb)C–Ni displayed smaller magnetic saturation than the corresponding (Ta,Nb)C–Co carbides. On the other hand, the coercivities of the (Ta,Nb)C–Co has higher value than those of (Ta,Nb)C–Ni. As the metal binder phase was increased, the coercivity decreased. The influence of the distribution of Ta, Nb, Co and Ni in the carbide phase and the metal binder phase were investigated by EDAX compositional analysis and its relation with the hardness and the magnetic properties were studied.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 27, Issue 4, July 2009, Pages 669–675
نویسندگان
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