کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1575000 1514736 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pulse electric current sintering of cubic boron nitride/tungsten carbide-cobalt (cBN/WC-Co) composites: Effect of cBN particle size and volume fraction on their microstructure and properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Pulse electric current sintering of cubic boron nitride/tungsten carbide-cobalt (cBN/WC-Co) composites: Effect of cBN particle size and volume fraction on their microstructure and properties
چکیده انگلیسی
Cubic boron nitride/tungsten carbide-cobalt (cBN/WC-Co) composites were fabricated by pulse electric current sintering (PECS), using Ni-P as sintering additives to promote low temperature densification. The effect of cBN particle size and volume fraction on the densification, microstructure and mechanical properties of WC-Co composites was investigated. There was no phase transformation from cBN to hBN (hexagonal BN) with low-hardness due to low sintering temperature (1100-1200 °C) and short sintering time. Smaller cBN particle led to lower sinter-ability of the composites due to its high specific surface area. The 30 vol% 10-14 µm cBN/WC-Co composite (P14V30) exhibited high hardness (18.3 GPa, 1200 °C) and high fracture toughness (15.6 MP·m1/2, 1000 °C). The high hardness resulted from the homogeneously dispersed cBN particles, which had a good bonding with the WC matrix. Increased fracture toughness was mainly attributed to crack deflection or bridging and pullout of cBN grains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 607, 23 June 2014, Pages 490-497
نویسندگان
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