آخرین محصولات
Synthesis and characterization of tungsten carbide fine powders
BET method 1. Introduction Tungsten carbide belongs to the group of interstitial carbides which possess properties characteristic for both ceramics and metals. …
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Production of Carbide Powders | Powder Metallurgy | Handbooks …
Abstract This article discusses the methods and procedures used to extract, purify, and synthesize tungsten carbide powder, metal, and other refractory carbide/nitride …
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Recovery of tungsten and cobalt from cemented tungsten carbide …
ABSTRACT. Tungsten and cobalt can be recovered from cemented tungsten carbide-Co (WC-Co) scraps using a novel process based on roasting of the scraps with Na 2 CO 3 and water leaching of the calcine containing Na 2 WO 4.The process was evaluated at different conditions testing several parameters, including Na 2 CO 3 /WC molar ratio 1:1–2:1, …
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Preparation of tungsten carbide powder
The present invention discloses a method for preparing tungsten carbide powder, which comprises: the raw material powder of 50% of Wat with the purity of more than 99% and 50% of with the purity of more than 99% is put in a ball mill, vacuum pumping to 10<-2> to 10<-4>Pa is carried out, argon is filled for protection, the pressure …
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Crack Identification in Tungsten Carbide Using Image Processing
The manual review of SEM images is subjective and time consuming. This study presents a method to identify and quantify cracks from an SEM microstructure of tungsten carbide (WC) in MATLAB. Image processing algorithms were used to segment crack regions from other surface defects and the background microstructure; and …
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Tungsten carbide molds for precision glass molding
Compared to the traditional removal method, precision glass molding technology has some overwhelming advantages such as mass production and easy to operate. ... the micro-hole array in the tungsten carbide (WC) substrate was made by the micro-electrical discharge machining (micro-EDM). Then, to improve the oxidation …
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Simulation analysis on optimization of tungsten carbide recovery
WC has been previously utilized as the anode to extract tungsten from NaCl–KCl–Na 2 WO 4 molten salt using electrochemical dissolution [].The molten salt electrochemical method is an efficient one-step process to extract tungsten from cemented carbide [2,3,4,5,6,7].When sodium tungstate [] and tungsten trioxide [] were used as …
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Self-Propagating High-Temperature Synthesis of Ultrafine Tungsten
The method suitable for tungsten carbide synthesis at low temperatures (~800°C) during 2 hours was suggested . It is based on the gas-solid reaction between a tungsten source (ammonium paratungstate or tungsten oxide) and carbon-containing gas phase which includes a mixture of H 2 and CH 4.
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How It Works – Making Tungsten Carbide Cutting Tools
In one method, the tungsten oxide is mixed with graphite (carbon). This mixture is heated to over 1200˚ C (2200˚ F) and a chemical reaction occurs that removes the oxygen from the oxide and combines …
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(PDF) An overview on different processes for recovery of valuable
In oxidation- leaching method, scrap of cemented tungsten carbide is first heated above the melting point of cobalt, which causes the sw elling and a porous mass is obtained on cooling .
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Tungsten carbide molds for precision glass molding
The service conditions of the tungsten carbide molds at different temperature and vacuum degree are given. Abstract. Tungsten carbide (WC) is a well-established material used in glass molding field due to its low thermal expansion and high compressive strength at elevated temperatures. ... Compared to the traditional removal method, …
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4: Linear intercepts method for grain size measurement (Sample …
The paper presents a method of fabrication and a comparison of the characteristics of obtained cemented carbide samples based on tungsten carbide with 10% metal binder. They were synthesized by ...
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Direct synthesis of nanocrystalline tungsten carbide from …
This article reports the synthesis of nanocrystalline tungsten carbide by solid state reaction method directly from its ore. Scheelite-an ore of tungsten was milled for 50 h and 100 h with activated charcoal in excess of stoichiometric ratio followed by calcination in the argon atmosphere at different temperatures.The 100 h milled sample showed …
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Synthesis and characterization of tungsten carbide fine powders
This paper describes a method for synthesis of pure, fine WC powder at temperature as low as 1000 °C. The method consists of simple thermal treatment of a mixture of tungsten powder and viscose rayon cloth. According to the author׳s knowledge, viscose rayon cloth was used as a carbon source for the first time. The effects of the …
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Tungsten Carbide
A catalyst produced from another tungsten carbide phase, Pt-WC/C, had an exchange current density of 0.048 mA cm − 2. 269 This Pt-WC/C catalyst (prepared by an intermittent microwave heating (IMH) method) was more tolerant to CO poisoning compared to a Pt/C catalyst. 270 As seen in Figure 26, the CO stripping peak for the Pt-WC/C catalyst is ...
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Microstructure and growth mechanism of tungsten carbide coatings …
A tungsten carbide coating was prepared by atmospheric chemical vapor deposition (CVD) with tungsten hexafluoride (WF 6), hydrogen, and dimethyl ether (DME) as the reaction gases, under a dimethyl ether partial pressure (P DME) of 3.2–21.0 kPa and a temperature of 550–600 °C.The phase compositions of the coatings are W 2 C + W …
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Fabrication and mechanical properties of tungsten carbide thin …
Herein, we investigated the feasibility of forming tungsten carbide thin films using a mist chemical vapor deposition method. WC 1- x thin films with smooth surfaces were obtained at growth temperatures of 650 °C or above, and the elemental composition ratios of C/W and N/W gradually approached 1 and 0, respectively, with increasing …
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US5021133A
A method is disclosed for producing ammonium paratungstate from cemented tungsten carbide which comprises subjecting the cemented tungsten carbide to electrolysis by passing about 0.5 to about 20 volts through an ammoniacal solution selected from the group consisting of ammonium hydroxide-ammonium chloride solution, ammonium hydroxide …
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Machining of Cemented Tungsten Carbide using EDM
The workpiece specimen is prepared from tungsten carbide rod (YG6) with 50 mm diameter and 100 mm high. It`s divided cross-sectional into nine equal disc using wire cut EDM. The pieces sectioned and divided into four equal specimens. The electrodes were manufactured from a 20x20 mm copper bar into a hallow cylinder of 5mm internal …
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Self-Propagating High-Temperature Synthesis of Ultrafine …
The method suitable for tungsten carbide synthesis at low temperatures (~800°C) during 2 hours was suggested [12]. It is based on the gas-solid reaction between a tungsten source (ammonium paratungstate or tungsten oxide) and carbon-containing gas phase which includes a mixture of H2 and CH4.
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Detonation gun spraying method of tungsten carbide
Publication Publication Date Title. CN102560320A Detonation gun spraying method of tungsten carbide. CN103422088B A kind of cold spray apparatus and method preparing 316L stainless steel coating. CN104174987B The method of intermetallic compound coating is prepared at metal base surface.
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Synthesis of tungsten carbide nanopowder via …
The purpose of this paper is to describe a preliminary investigation of tungsten carbide nanopowder and its possibilities of use as catalytic materials for hydrogen evolution reaction (HER). The tungsten …
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Molybdenum Carbides: Synthesis and Application in Catalysis
The applications of catalysts based on molybdenum carbide are considered. Attention is focused on the effects of molybdenum carbide preparation methods on the crystal structure and catalytic activity of molybdenum carbide in the redox reactions of organic compounds. In recent years, there has been a growing interest in transition metal …
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Fused Tungsten Carbide Synthesis by Thermal Arc Plasma Melt …
Fused tungsten carbide (WC–W 2 C) was synthesized successfully form WC+W (0, 5 and 10 wt%) by arc plasma melt-cast method within only 10 min. of plasma …
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US10697073B2
A method for manufacturing an electrode for hydrogen production using a tungsten carbide nanoflake may include: forming a tungsten carbide nanoflake on a nanocrystalline diamond film by means of a chemical vapor deposition process in which hydrogen plasma is applied; and increasing activity of the tungsten carbide nanoflake to a hydrogen …
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A new method for preparation of tungsten carbide powder by in …
1. Introduction. Electrochemical reduction in a molten salt is a new method for efficient and green recovery of cemented carbide [1], [2], [3].Much research has been carried out on the extraction of refractory metal tungsten from cemented carbide and the separation of tungsten and cobalt [4], [5], [6], [7].When recovering high cobalt cemented …
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Method of reducing defects in powder metallurgy tungsten carbide elements
For example, in the process represented by FIG. 1 in which a tungsten carbide cobalt powder mix having a liquidus temperature of 1292° C. was formed into a tungsten carbide cutting element by compacting the pre-mixed powders into the desired shape and then raising the temperature into the range of 1400° C., a sintered tungsten carbide is the ...
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Pure tungsten and oxide dispersion strengthened tungsten manufactured
The orthogonal method is used to optimize suitable processing parameters for different powders as shown in Table 2. The input volumetric laser energy density (E V: J/mm 3) ... In-situ irradiation tolerance investigation of high strength ultrafine tungsten-titanium carbide alloy. Acta Mater., 164 (2019), pp. 547-559.
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What is the classification method for tungsten carbide grades?
These grades are mainly used for cutting steel parts, which typically have a cobalt content of 5%-10% and a grain size range of 0.8-2 μm. By adding 4% to 25% of titanium carbide (TiC), the tendency of tungsten carbide (WC) to diffuse to the surface of the steel scrap can be reduced. Tool strength, crater wear resistance and thermal shock ...
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Tungsten Carbides | SpringerLink
Abstract. Tungsten forms with carbon several chemical compounds ( see also section C – W in Table I-2.13): tungsten monocarbide δ -WC 1±x phase …
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