Study of processing routes for WC-MgO composites with varying MgO contents consolidated by FAST/SPS

Radajewski, Markus; Schimpf, Christian; Krüger, Lutz

doi:10.1016/j.jeurceramsoc.2017.01.005

Cited by 39 publications

(12 citation statements)

References 29 publications

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“…The major toughening mechanisms existing particle-toughened ceramics were ascribed to (i) crack deflection by the particulates ahead of a propagating crack (crack deflection model); (ii) crack bridging by particulates (particulate bridging model); (iii) interaction between the crack front and particulates (crack front bowing model); and (iv) thermal residual stress field resulting from mismatch in coefficients of thermal expansion of ceramic matrix and particulates as well as (v) the grain size [132,133]. With respect to BTC, the most used dispersed phases are Al 2 O 3 [95,99], MgO [134][135][136][137], TiC [79], SiC [71,87,90], Mo 2 C [85], and ZrC [63]. Qu et al [101] successfully prepared WC-Al 2 O 3 composite by employing conventional hot-pressing sintering.…”

Section: Particle Dispersion Tougheningmentioning

confidence: 99%

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A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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HIGHLIGHTS• Establish processing-composition-microstructure-property relationships governing binderless tungsten carbide (BTC).• Highlight the densification improving strategies and toughening methods for BTC.• Provide key challenges as well as the outlook for superior peformance associated with BTC.ABSTRACT WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past decades. Despite the advantages, however, recently there have been concerns about the challenges associated with the use of Co, i.e. price instability, toxicity and properties degeneration, which necessitates the fabrication of binderless tungsten carbide (BTC). On the other hand, BTC or BTC composites, none of them, to date has been commercialized and produced on an industrial scale, but only used to a limited extent for specialized applications, such as mechanical seals undergoing high burthen as well as high temperature electrical contacts. There are two challenges in developing BTC: fully densifying the sintered body together with achieving a high toughness. Thus, this review applies towards comprehensively summarize the current knowledge of sintering behavior, microstructure, and mechanical properties of BTC, highlighting the densification improving strategies as well as toughening methods, so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly, harmless to human health and low in production cost. This paper shows that the fabrication of highly dense and high-performance BTC is economically and technically feasible. The properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters.

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Section: Particle Dispersion Tougheningmentioning

confidence: 99%

“…With respect to BTC, the most used dispersed phases are Al 2 O 3 [ 95 , 99 ], MgO [ 134 – 137 ], TiC [ 79 ], SiC [ 71 , 87 , 90 ], Mo 2 C [ 85 ], and ZrC [ 63 ]. Qu et al [ 101 ] successfully prepared WC–Al 2 O 3 composite by employing conventional hot-pressing sintering.…”

Section: Toughening Of Binderless Tungsten Carbidementioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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“…The peak located at 31.35 eV corresponds to the metallic W and the peak at 32.19 eV resulted from the reaction between W and C, which can be proved by the change of binding energy of W 4f that is obviously related to the change of C 1s electron. The chemical shift of W 4f and C 1s in this composite is highly dependent on the rate of defects [ 45 , 46 ] formed during MA. The other higher peak at 32.75 eV explained that the composite was contaminated by oxygen that can be suggested to originate either from milling or sintering.…”

Section: Resultsmentioning

confidence: 99%

In Situ Tungsten Carbide Formation in Nanostructured Copper Matrix Composite Using Mechanical Alloying and Sintering

Yusoff

Hussain

2022

Materials

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In this study, an in situ nanostructured copper tungsten carbide composite was synthesized by mechanical alloying (MA) and the powder metallurgy route. The microstructure and phase changes of the composite were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Tungsten carbide phases (WC and W2C) were only present after MA and combination of sintering. Higher energy associated with a longer milling time was beneficial for the formation of WC. Formation of W2C and WC resulted from internal refinement due to heavy plastic deformation in the composite. The solubility of the phases in the as-milled and sintered composite was described by the changes of the lattice parameter of Cu. Chemical analysis of the surface of a composite of W 4f and C 1s revealed that the increased defects introduced by MA affect the atomic binding of the W-C interaction.

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“…Other oxides are also being studied. A composite with 21.1 vol% magnesium oxide [12] accomplished mechanical properties similar to the WC-Al2O3-ZrO2 composite.…”

Section: Introductionmentioning

confidence: 88%

Manufacturing and Properties of Tungsten Carbide-Oxide Composites

Vornberger

Pötschke

Berger

2017

KEM

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Conventional WC-Co hardmetals are widely used in various applications due to their excellent properties. High hardness can be achieved using compositions with little to no content of cobalt or nickel. These binder metals are hazardous to health, making a substitution not only desirable because of availability and cost reasons. A new possibility to manufacture such hard materials is the combination of tungsten carbide with oxides such as Al2O3 and ZrO2. In this way the binder metal content can be replaced. Furthermore the content of the also expensive WC can be reduced. Such metal carbide – oxide composites with oxide contents between 16 vol% and 40 vol% were manufactured. The completely dense composites feature high hardness values of 2000 HV10 to 2400 HV10 while also having an acceptable fracture toughness of up to 7 MPa⋅m1/2. The improved mechanical properties make the replacement of WC-Co hardmetals and binder free WC ceramics in special areas possible.

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Study of processing routes for WC-MgO composites with varying MgO contents consolidated by FAST/SPS

Cited by 39 publications

References 29 publications

A Review on Binderless Tungsten Carbide: Development and Application

A Review on Binderless Tungsten Carbide: Development and Application

In Situ Tungsten Carbide Formation in Nanostructured Copper Matrix Composite Using Mechanical Alloying and Sintering

Manufacturing and Properties of Tungsten Carbide-Oxide Composites

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