2020-3-14 · WC Co cemented carbides are easy to oxidize and decompose in high temperature application, which have many problems, such as brittleness, brittle fracture, processing softening and edge breaking, etc. they are still not suitable for high speed cutting of steel, so
Besides, the WC grain size and distribution are only decided by the sintering temperature. Holding time has negligible effects on them. No matter how holding time is, the mean grain size is 2.7μm when the sintering temperature is kept at 1450 °C.
silicon carbide sintering furnace from Shenyang North True Vacuum Technology Co., Ltd.. Search High Quality silicon carbide sintering furnace Manufacturing and Exporting supplier on Alibaba.com. 11-10 . 2019year . Use of powder metal sintering/diffusion bonding to enable .
Coarse-grain WC-15Co,WC-22Co and micro grin WC-12Co-1Cr_3C_2,medium-grain WC-12Co cemented Carbide were made by sintering and HIP and sintering-HIP. The difference of two processes and the effect of process on structure and properties of WC-Co cemented Carbide were studied from technical and economical points of view.
Although WC–Co hardmetals can be made directly with mixing and reactive sintering of tungsten, carbon, and cobalt powders, the most commonly used method for preparing hardmetals is still using WC and cobalt powders as initial raw materials.This makes it easier to control the WC grain size and the resulting bulk material properties.
2018-4-30 · microwave sintering of wc-co based cemented carbides. microwave processing and engineering center. co wt.% heating microwave sintered wc-co drill parts. improved impact strength. microwave sintered conventionally sintered. mri. microwave processing and engineering center. 0 2 4 6 8 10 12 14 16 18 20 micro std.
Abstract: This paper carries out the research on using the toughening mechanism of phase transition of ZrO 2 to inhibit the WC grain and improve the toughness of the hard alloys. WC–ZrO2–8wt%Co hard metals was mixed with 0-2 wt% nano-ZrO 2 and prepared by conventional sintering (CS) for 2 h at 1440oC to see whether the addition of ZrO 2 could improve densification behavior, the
The present invention discloses a cemented carbide comprising the technical field of the preparation of a rare earth element ultrafine grained WC-Co cemented carbide v methods for their preparation. By weight of WC cemented carbide hard phase of carbide
2018-12-11 · obtained at 1300°C and the microwave furnace sintering WC and Co powders is a promising technique to produce ceramic reinforced Co composites. Keywords: Powder Metallurgy, Ceramic–Metal Composites, Microwave Powder Sintering, Scratch Tools. 1. INTRODUCTION Tungsten carbide has been known for a long time for its
The results indicate that, during sintering of the starting powder mixture, containing not only WC and Co but also the lower carbide W 2 C and free carbon, W 2 C reacts with cobalt metal to form Co 3 W. At sintering temperatures from 900 to 1200°C, the reaction intermediate is the ternary carbide phase Co
2016-10-28 · Microstructure and mechanical properties of WC−Co, WC−Co−Cr 3 C 2 and WC−Co−TaC cermets fabricated by spark plasma sintering P. SIWAK1, D. GARBIEC2 1. Poznan University of Technology, Institute of Mechanical Technology, 3 Piotrowo street, 60-965 Poznan, Poland; 2. Metal Forming Institute, 14 Jana Pawla II street, 61-139 Poznan, Poland
2013-7-7 · Finally, the WC–Co/Ni compacts were sintered in vacuum furnace at a heating rate of 20 K min?1. Although an elevated sintering temperature is preferred to achieve the densi?cation of the WC–Co/Ni compacts, sintering temperature of gt;1320 °C results in fusing
2016-7-23 · Keywords: cemented carbide, sintering parameter, microstructure. INTRODUCTION WC- 10 %Co is one of the hard metals which are made up from ceramic, which is tungsten carbide (WC), binded with cobalt (Co) phase (Upadhyaya 2001). One of the applications of WC-Co is used to make cutting tools, and this hard metal possess massive mechanical and
2016-11-16 · But it is important to understand the sintering mechanisms of pure tungsten carbide (WC) since it is one component of the often studied system of WC–Co hardmetals. By studying the sinter behaviour of pure tungsten carbide the solid state sintering mechanism which becomes particularly important with ?ner grades can be studied separately from any in?uence of the liquid phase.
Tungsten carbide cobalt (WC-CO) is an alloy of a hard ceramic phase, the tungsten carbide (WC) and a ductile metallic phase, the cobalt (Co). Important properties of WC-Co are hardness, strength, high breaking and beating ductility as well as high electrical and thermal conductivity. Read more