preparation and sintering of wc co composite powders

Mechanochemical process for producing fine WC/CO

Conventionally, WC/Co composite powder is prepared by sufficiently mixing tungsten (W) with carbon black in a ball-mill, and performing a heat treatment for the mixture at 1,400 -1,600 C. in a carbon crucible under a hydrogen atmosphere to give WC, and

Development of WC–ZrO2 Nanocomposites by Spark

Yuanyuan Li, Donghai Zheng, Xiaoqiang Li, Shengguan Qu, Chao Yang, Cr3C2 and VC doped WC–Si3N4 composites prepared by spark plasma sintering, International Journal of Refractory Metals and Hard Materials, 10.1016/j.ijrmhm.2013.07.004, 41, (540-546),

Preparation of WC

Sintered composites of WC–WB–W 2 B were prepared from B 4 C–W–WC powders using a reactive energization hot-pressing technique that initiated a solid state reaction between B 4 C and W. Below a WC mole fraction of 0.769 in the starting powder, WB and WC were formed according to the reaction B 4 C+5W+xWC=WB+(1+x)WC, while WB, W 2 B, and WC were produced above a mole fraction of 0.854.

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Materials Science and Engineering A 486 (2008) 404–408 Effect of size and location of spherical pores on transverse rupture strength of WC-Co cemented carbides Seung I. Chaa, Kyong H. Leeb,HoJ.Ryuc, Soon H. Hongb,∗ a International Center for Young Scientists, National Institute for Materials Science 1-1, Namiki, Tsukuba 305-0044, Japan

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRAFINE WC/Co

Table 1 lists the main characteristics of the WC, Co, CBN and Cr 3 C 2 starting powders. Table 2 describes the composition of each specimen and the nomenclature used in this paper. In the experiment, the CBN-WC/Co composite powders were prepared using

Tungsten carbide

Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through a process called sintering for use in industrial machinery, cutting tools, abrasives

Synthesis, sintering and characterization of Al2O3

Synthesis, sintering and characterization of Al2O3-13 wt.% TiO2 composite powder prepared by polymer assisted co-precipitation route Singh, N (2014) Synthesis, sintering and characterization of Al2O3-13 wt.% TiO2 composite powder prepared by polymer assisted co-precipitation route.

Mechanical characterization of composites prepared from WC powders

In this study composite powders of WC and Ni/Fe/Cr were prepared in an innovative way, which consists of the sputter-deposition of the metallic binder onto the tungsten carbide particles. Compacts of coated powders were sintered by conventional vacuum sintering

TRIBOLOGICAL PROPERTIES OF WCCo/cBN COMPOSITES PRODUCED BY PULSE PLASMA SINTERING

composites, preparation of the test samples, and determination of the friction coefficient in the composite-steel and Co, c) WC powders 1765 Fig. 3. Schematic representation of the ball-on-disc method 3. Results and discussion Table 1 gives the measured

Synthesis of ultrafine WC‐Co composite powders under

Lowering the reaction temperature and increasing the reaction rate would lead to finer WC‐Co composite powders. Ultrafine WC‐Co composite powders with almost no unwanted phases were obtained under the H 2 flow rate of 0.75 m 3 /h at 950C for 0.5 hour and the average particle size was 155 nm with good dispersion.

Development of WC–ZrO2 Nanocomposites by Spark

Yuanyuan Li, Donghai Zheng, Xiaoqiang Li, Shengguan Qu, Chao Yang, Cr3C2 and VC doped WC–Si3N4 composites prepared by spark plasma sintering, International Journal of Refractory Metals and Hard Materials, 10.1016/j.ijrmhm.2013.07.004, 41, (540-546),

Preparation of WC

Sintered composites of WC–WB–W 2 B were prepared from B 4 C–W–WC powders using a reactive energization hot-pressing technique that initiated a solid state reaction between B 4 C and W. Below a WC mole fraction of 0.769 in the starting powder, WB and WC were formed according to the reaction B 4 C+5W+xWC=WB+(1+x)WC, while WB, W 2 B, and WC were produced above a mole fraction of 0.854.

Synthesis of ultrafine WC‐Co composite powders under

Lowering the reaction temperature and increasing the reaction rate would lead to finer WC‐Co composite powders. Ultrafine WC‐Co composite powders with almost no unwanted phases were obtained under the H 2 flow rate of 0.75 m 3 /h at 950C for 0.5 hour and the average particle size was 155 nm with good dispersion.

Preparation of WC

Sintered composites of WC–WB–W 2 B were prepared from B 4 C–W–WC powders using a reactive energization hot-pressing technique that initiated a solid state reaction between B 4 C and W. Below a WC mole fraction of 0.769 in the starting powder, WB and WC were formed according to the reaction B 4 C+5W+xWC=WB+(1+x)WC, while WB, W 2 B, and WC were produced above a mole fraction of 0.854.

Spray conversion process for the production of nanophase

After thermochemical conversion of the precursor powders, the resulting nanophase WC--Co powders had respectively 23, 15, 6, and 3 weight percent cobalt binder phase. The ratio in solution C was fixed at 0.37, which yields 10% cobalt in the WC--Co

Discharge plasma sintering (SPS) of cermet composites

Cha S I et al. conducted SPS sintering study on micron-sized WC-CO composite powder, and found that under the sintering temperature of 1050, pressure of 50MPa and heat preservation for 10min, the material could be sintered into densification, and the grain

High quality thermal spray powder Chrome oxide

Harbin pei-ze material technology co., ltd. specializes in the production of thermal spraying powder, oxide, carbide, metal alloy powder, etc., with customers all over the world, the company's thermal spraying powder is widely used in aviation, petroleum,

TRIBOLOGICAL PROPERTIES OF WCCo/cBN COMPOSITES PRODUCED BY PULSE PLASMA SINTERING

composites, preparation of the test samples, and determination of the friction coefficient in the composite-steel and Co, c) WC powders 1765 Fig. 3. Schematic representation of the ball-on-disc method 3. Results and discussion Table 1 gives the measured

Effect of Cr3C2 and VC on the Mechanical and Structural

The effect of addition of metallic carbides Cr 3 C 2 and Cr 3 C 2 + VC on structure and mechanical properties of WC-10 wt% Co nanocomposites have been studied. After preparing and compacting of the powders under pressure of 200 MPa, the samples were sintered at temperatures of 1370 C, 1410 C and 1450 C for 1 hour.

Effect of High

Effect of High-Energy Milling and Sintering Temperature on the Properties of Al 2 O 3 -WC-Co Journal of Materials Engineering and Performance ( IF 1.652) Pub Date : 2021-01-05, DOI: 10.1007 Heytor V. S. B. Azevdo, Rafael A. Raimundo, David D. S. Silva, Lus M. F. Morais, Francin A. Costa, Daniel A. Macedo, Danielle G. L. Cavalcante, Ulame U. Gomes

Sintering

Sintering or frittage is the process of compacting and forming a solid mass of material by heat or pressure without melting it to the point of liquefaction. Sintering happens naturally in mineral deposits or as part of a manufacturing process used with metals, ceramics, plastics, and

Chemical Vapor Synthesis and Characterization of

Nanosized WC−Co composite powders were produced by a chemical vapor synthesis (CVS) process. The reactions of vaporized chlorides (WCl6 and CoCl2) with methane−hydrogen mixtures produced nanosized WC−Co composite powder, which sometimes contained W2C or W phase. The effects of reactant concentrations, WCl6 volatilizer temperature, and H2 to CH4 molar ratio in the feed stream

Preparation and sintering of WC–Co composite powders

2014/7/1WC–Co composite powders were obtained by merging the preparation of Co powders with the mixtures of WC–Co powders. The method concludes the following procedures: (1) WC–CoC 2 O 4 precursors were prepared by adding an ammonium oxalate ((NH 4 ) 2 C 2 O 4 ) solution into WC–CoCl 2 suspensions under stirring at 50 C; and (2) WC–CoC 2 O 4 precursors were reduced at 500 C for 3

Effect of Cr 3 C 2 and VC on the Mechanical and Structural

The effect of addition of metallic carbides Cr3C2 and Cr3C2 + VC on structure and mechanical properties of WC-10 wt% Co nanocomposites have been studied. After preparing and compacting of the powders under pressure of 200 MPa, the samples were sintered

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