tungsten carbide ultrafine

2021-08-24T10:08:59+00:00
  • Solvent-Free Synthesis of Ultrafine Tungsten Carbide ...

    2020-7-18  Ultrafine cubic tungsten carbide nanoparticles in situ formed during high-temperature pyrolysis are homogeneously dispersed on carbon nanosheets. It is

  • Cited by: 26
  • Synthesis of high-purity ultrafine tungsten and tungsten ...

    2020-6-1  Ultrafine tungsten and tungsten carbide powders have many potential applications compared to traditional tungsten and tungsten carbide, which could greatly improve the physical, chemical and mechanical properties of W alloys and WC−Co hard metals [12,13]. Therefore, the preparation of them becomes the current research focus.

  • Cited by: 1
  • Fabrication of ultrafine and high-purity tungsten carbide ...

    2019-5-5  In the current study, ultrafine and high-purity tungsten carbide (WC) powders are successfully prepared by a two-step process: carbothermic reduction of WO 3 followed by carbonization reaction. The effects of the C/WO 3 molar ratio, reaction temperature and reaction time on the phase transition and morphology evolution of the products are investigated. . During the carbothermic reduction ...

  • Cited by: 23
  • A facile pathway to prepare ultrafine WC powder via a ...

    2020-1-1  Ultrafine tungsten carbide powder with a low free carbon can be efficiently prepared by this approach. When the C/WO 3 molar ratios were 2.5 and 2.6, the tungsten carbide with the average particle sizes of about 93 nm and 77 nm could be obtained after carbothermic pre

  • Cited by: 3
  • Hot isostatic pressing of ultrafine tungsten carbide ...

    Hot Isostatic Pressing (HIP) has been successfully used to consolidate tungsten carbide-10 weight% cobalt (WC-10 wt% Co) powders mixtures with WC powder particle sizes in the range of 100 nanometers. Fully dense specimens of this composition have been obtained by HIP at 1000°C, a temperature well below those usually required for reaching the closed porosity stage in the WC-Co system ...

  • Cited by: 153
  • Self-Propagating High-Temperature Synthesis of Ultrafine ...

    2012-12-19  Tungsten carbide ultrafine crystals contained in the introduced semiproduct can accelerate tungsten carbide crystallization and appear to be crystallization centers but a rather viscous medium prevents intensive crystal growth. Coating of tungsten carbide particles with liquid melt results in better stability of tungsten carbide

  • Cited by: 3
  • Solvent-Free Synthesis of Ultrafine Tungsten Carbide ...

    2020-7-18  Ultrafine tungsten carbide nanoparticles-decorated carbon nanosheets were successfully fabricated via a simple solvent-free strategy. The chemical composition of tungsten carbide/carbon composites can be easily manipulated by the weight ratio of dicyandiamide to ammonium metatungstate.

  • Aggregates Isolated from Ultrafine Tungsten Carbide Powder

    2014-8-18  The present invention provides a method for the separation of aggregates from ultrafine tungsten carbide powder. Specific steps are as follows: 1) The dispersing agent is added to the medium by sedimentation with ethanol or petroleum ether or ethylene glycol in a mixture of oleic acid composition, formulated as a solution settlement L1;

  • Synthesis of high-purity ultrafine tungsten and tungsten ...

    Abstract. High-purity ultrafine W or WC powder was prepared via a two-step process composed of the carbothermic pre-reduction of WO 2.9 and the following deep reduction with H 2 or carbonization with CH 4 +H 2 mixed gases. The effects of C/WO 2.9 molar ratio and temperature on phase composition, morphology, particle size, and impurity content of products were investigated.

  • Cited by: 1
  • In-situ irradiation tolerance investigation of high ...

    2019-2-1  In a previous study, W-TiC (0.5%) with ultrafine (100–500 nm) and nanocrystalline (˂100 nm) microstructures were shown to be free of irradiation hardening when exposed to neutron irradiation at 873 K to a fluence of 2 × 10 24 n⋅m −2 with lower loop and void densities relative to pure tungsten .

  • Cited by: 19
  • Preparation Technology of Ultra-Fine Tungsten Carbide ...

    2020-5-6  Ultrafine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 and 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by preparing ultra-fine WC powders. Because of the preparation and application of nanoscale WC powders, ultrafine

  • Sintering Technology of Tungsten Carbide Ultrafine ...

    Sintering Technology of Tungsten Carbide Ultrafine Cemented Carbide. Cemented carbide is mainly used in cutting tools, mining tools, molds and high-pressure and high-temperature rejection cavities, among which cutting tools and mining tools account for 33% and 25% of cemented carbide

  • Combustion synthesis of ultrafine tungsten carbide

    2008-9-1  The synthesis of ultrafine tungsten carbide (WC) powder has been investigated from a WO 3 + Mg + C mixture via combustion technique. The values of combustion parameters were estimated over the Mg concentration range 3 to 16 mol. Fast increasing tendency of the WC/W 2 C phase ratio from Mg concentration has been found in the final products. Phase pure WC was prepared with more than 10

  • Hot isostatic pressing of ultrafine tungsten carbide ...

    Hot Isostatic Pressing (HIP) has been successfully used to consolidate tungsten carbide-10 weight% cobalt (WC-10 wt% Co) powders mixtures with WC powder particle sizes in the range of 100 nanometers. Fully dense specimens of this composition have been obtained by HIP at 1000°C, a temperature well below those usually required for reaching the closed porosity stage in the WC-Co system ...

  • (PDF) Solvent-Free Synthesis of Ultrafine Tungsten Carbide ...

    of these tungsten carbide/carbon composites are all located at 1600 cm −1 , while the local amplification reveals that the values of full-width half-maximum in G band for W CC-2,

  • Solvent-Free Synthesis of Ultrafine Tungsten Carbide ...

    2020-7-18  Ultrafine tungsten carbide nanoparticles-decorated carbon nanosheets were successfully fabricated via a simple solvent-free strategy. The chemical composition of tungsten carbide/carbon composites can be easily manipulated by the weight ratio of ...

  • Effect mechanism of arsenic on the growth of ultrafine ...

    2018-6-1  Nano tungsten carbide (WC) powder is an important raw material for the preparation of ultrafine cemented carbide, which can produce hard alloy material with high hardness, high wear resistance and high toughness , . Arsenic is the primary impurity element and its content reached 0.3 wt% in wolframite or scheelite ores in the form of arsenate.

  • (PDF) Hot isostatic pressing of ultrafine tungsten carbide ...

    Ultrafine-grained tungsten carbide-cobalt (WC-Co) cemented carbides with different Co content were fabricated by spark plasma sintering. Then, tribological behavior of the ultrafine-grained WC-Co ...

  • K10 K20 10*330mm Ultrafine Tungsten Carbide Grinding

    High quality K10 K20 10*330mm Ultrafine Tungsten Carbide Grinding Rod from China, China's leading Tungsten Carbide Rod product market, With strict quality control Tungsten Carbide Rod factories, Producing high quality K10 K20 10*330mm Ultrafine Tungsten Carbide Grinding Rod products.

  • Microwave synthesis of ultrafine and nanosized powders

    A new method of synthesis of nanosized and ultrafine tungsten oxide and carbide powders is offered, which combines carbon carrier supported classical liquid-phase precipitation and low-temperature microwave treatment. The full range of intermediate substances obtained during thermolysis, reduction and carburization of precursors to final products is presented. It is shown that cooling of ...

  • Ultrafine Tungsten Carbide Powder Reduction Method

    2020-5-7  Ultrafine cemented carbide is a tool material developed in recent years. It is mainly based on ultrafine tungsten carbide powder and adds appropriate binder (such as Co) and grain growth inhibitor to produce high hardness, high wear resistance and high toughness cemented carbide material.

  • Preparation Technology of Ultra-Fine Tungsten Carbide ...

    2020-5-6  Ultrafine tungsten carbide (WC) powder refers to WC powders with a particle size between 100 and 500 nm. Researchers have improved the comprehensive properties of WC-based cemented carbides by preparing ultra-fine WC powders. Because of the preparation and application of nanoscale WC powders, ultrafine

  • Sintering Technology of Tungsten Carbide Ultrafine ...

    Sintering Technology of Tungsten Carbide Ultrafine Cemented Carbide. Cemented carbide is mainly used in cutting tools, mining tools, molds and high-pressure and high-temperature rejection cavities, among which cutting tools and mining tools account for 33% and 25% of cemented carbide

  • Preparation of ultrafine tungsten carbide powder by CVD ...

    Preparation of ultrafine tungsten carbide powder by CVD method from WCl6–C2H2–H2 mixtures - Volume 8 Issue 10

  • Production of ultrafine tungsten carbide in a discharge ...

    2014-12-5  In this investigation, the feasibility of direct synthesis and production of ultrafine tungsten carbide in a high-speed jet of tungsten carbon electric discharge plasma is shown. According to X-ray diffraction and electron microscopy, the plasmadynamic synthesis product consists of the cubic modification of tungsten carbide mostly, the structure of which is closest to the structural model of ...

  • Synthesis of Ultrafine Mesoporous Tungsten Carbide by

    2011-4-27  Ultrafine mesoporous tungsten carbide (WC) was prepared from as‐synthesized mesoporous WC using high‐energy ball milling treatment. X‐ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption‐desorption techniques were used to characterize the samples.

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  • Self-Propagating High-Temperature Synthesis of

    2012-12-14  Self-Propagating High-Temperature Synthesis of Ultrafine Tungsten Carbide Powders 5 volume of the reactive mass. So it is necessary to carry out some additional operations to sort out the main compound [24, 25]. Having analyzed the literature

  • (PDF) Hot isostatic pressing of ultrafine tungsten carbide ...

    Ultrafine-grained tungsten carbide-cobalt (WC-Co) cemented carbides with different Co content were fabricated by spark plasma sintering. Then, tribological behavior of the ultrafine-grained WC-Co ...

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  • MICROSTRUCTURE AND MECHANICAL PROPERTIES OF

    2016-5-11  few decades, finer tungsten carbide (WC) might be manufactured to achieve better mechanical properties such as strength and toughness in CBN-WC/Co cemen-ted carbide [6-8]. However, ultrafine WC powder demonstrates high activity in the sintering densification process, and thus ultrafine WC particles are prone to

  • SKL 钢铁冶金新技术国家重点实验室

    2020-6-12  Kai-Fei Wang, Guo-Dong Sun, Yue-Dong Wu, Guo-Hua Zhang*:Fabrication of ultrafine and high-purity tungsten carbide powders via a carbothermic reduction–carburization process, Journal of Alloys and Compounds, 2019, 784: 362-369.