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i) WC-Co grades Straight grades, sometimes referred to as unalloyed grades, are nominally pure WC-Co composites. They contain 3-13 w/o (weight percent) Co for cutting tool grades and up to 30 w/o Co for wear resistant parts. The average carbide particle size varies from sub-micron to eight microns.
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Most approaches to manufacture WC–Co with LPBF show a high porosity, undesirable phases in the microstructure, and inhomogeneous carbide distribution. However, the production of WC–Co cutting tools by LPBF will offer some benefits such as production of geometrically optimized inner cooling channels or optimized geometry of …
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WC-Co Powder Applications WC-Co Powder is mainly used in the production of tools for milling, drilling, and pressing/punching processes. In addition, surgical instruments are made of tungsten carbide-cobalt and the best-known product is the rotating balls used in ballpoint pens. WC-Co Powder Packing 25KG per drum or as required
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1 Introduction. Laser powder-bed fusion (LPBF) is a technology spanning application from prototyping to the production of small batch sizes. Process parameters for various steels and nonferrous materials, e.g., nickel-based alloys, are already fully developed. 1 Composites of tungsten carbide (WC) and cobalt (Co), known as cemented …
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Cemented carbides, also known as Widia, are hard metals produced by sintering process and widely used in mechanical machining. They show high cutting capacity and good wear resistance; consequently, they result to be excellent materials for manufacturing cutting tools and sandblast nozzles.
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The microstructure and morphology of WC grains of the conventional ultra-coarse WC–Co grade are characterized by faceted WC grains varying from nearly 2–10 μm in size which are described in detail in Ref. [26].The structure of the novel cemented carbide comprised rounded WC grains varying from nearly 1–8 μm in size [6], [26].It contains very …
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The WC–Co composite powders are two-phase powders prepared by the thermochemical synthesis, spray drying or sol–gel method. These powders contain ultrafine WC and cobalt grains with a uniform distribution on the micrometer scale.
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WC-Co cemented carbide is one of the widely hard materials used for cutting in machining industry, due to its microstructural and mechanical stability even at high temperature. However, diffusion wear is the most serious problem that WC-Co suffers from. One of the most applied approaches to improve the WC–Co cemented carbide performances is the …
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Tungsten carbide-cobalt is an alloy of hard, ceramic tungsten carbide and the ductile cobalt, often known as cemented carbide. The material is a metal matrix composite, in which cobalt particles are ambedded in a tungsten carbide matrix. The tungsten carbide can form as WC or WC 2, depending on synthesis conditions.
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The WC–TiC– TaC– NbC–Co cemented carbide was elaborated by conventional powder metallurgy then thermal, microstructural and mechanical investigations were performed on the elaborated carbide. A temperature of sintering was determined to be more than 1347 oC by differential thermal analysis (DTA) and differential scanning calorimetry (DSC).
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particle size of WC at the same value as above, therefore a clear effect of the enhancement of the Co concentration could not be achieved. In the case of the so-called Ultrafine hardmetal the dissolution rate was higher than in the cases previously discussed. Probably an 8% Co content or 2% less WC can
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The experimental results for Cs-137 and Co-60 gamma sources were carried out. Experimental results of tung-sten (W), WC Co and lead (Pb) against Cs-137 and Co-60 gamma sources were given in ableT I. ABLET I Experimental results for tungsten, WC Co and lead against Cs-137 and Co-60 gamma source. Material (code) Thickness [cm] 1. …
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Cemented carbides, also known as Widia, are hard metals produced by sintering process and widely used in mechanical machining. They show high cutting capacity and good wear resistance; consequently, they result to be excellent materials for manufacturing cutting tools and sandblast nozzles. In this work, the wear resistance of WC-Co carbides containing …
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WC-10Co-4Cr is one candidate coating and can be deposited using several variants of the HVOF spraying process. This work has considered HVOF sprayed WC-10Co-4Cr as a generic coating type for replacing hard chrome. Coatings were prepared using the Jet-Kote ®, Diamond Jet ® and JP5000 ® HVOF systems.
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This article presents results relating to the production of a WC-Co gear cutting tool via selective laser melting (SLM). The influence of powder grain geometry and chemical composition on SLM process outcomes are firstly investigated by producing and testing simple cylindrical specimens, from which optimal process parameters and scanning …
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2. Materials. The objective of this study was to understand how differences in WC grain size affected the mechanical properties of tungsten carbide‑cobalt composites. Materials with comparable cobalt content, but differing microstructures, were sought for evaluation against another commercially-available tungsten carbide‑cobalt that has ...
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The starting materials in the production of hard metal components, fine WC and Co powders, are commonly dispersed in a liquid for mixing and grinding. The first paper in this thesis concerns the reactivity of WC and Co powders in water. We found that the WC powder is oxidised and covered with a layer of WO 3 with a thickness of less than 3nm.
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The mechanical properties of WC tools are mainly related to the tungsten carbide particle size (0.1–20 μm) and cobalt content (3–25 wt.%). Highest hardness is obtained with lowest WC particle dimensions and lowest Co content; however, this leads to low toughness that may cause catastrophic failure during cutting operations.
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Cemented tungsten carbide (WC-Co) hard metal is known for its high hardness and wear resistance in various applications. Moreover, areas include fine grained materials, alternative binders, and alternative sintering techniques has been discussed in this paper. Export citation and abstract BibTeX RIS Previous article in issue Next article …
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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 they have great limitations.
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The WC-10Co-4Cr coatings prepared with the Jet Kote ® and the JP5000 ® showed friction characteristics similar to the hard chrome plating in dry sliding wear conditions, with a friction coefficient of about 0.8. The WC-10Co-4Cr coatings prepared with the 3 systems show low resistance to corrosion in seawater compared to hard chrome plating.
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