Influence of Grain Refinement on Microstructure and Mechanical Properties of Tungsten Carbide/Zirconia Nanocomposites

Nasser, Ali; Kassem, Mohamed A.; Elsayed, Ayman; Gepreel, Mohamed Abdel‐Hady; Moniem, Ahmed A.

doi:10.1007/s11665-016-2341-8

Cited by 12 publications

(6 citation statements)

References 32 publications

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“…Zirconia (ZrO 2 ) has received attention as a substitute for Co because of its excellent properties: (1) high chemical stability up to quite high temperature about 1400 °C; (2) not softening at elevated temperatures; (3) high electrochemical corrosion resistance; (4) increasing toughness by transformation toughening [103][104][105][106][107]. Besides, ZrO 2 was found to facilitate the sintering of BTC by many researches [108][109][110].…”

Section: Zirconia (Zro 2 )mentioning

confidence: 99%

“…The compresses, acting as closure stresses, reduce the local crack tip stress intensity, thereby enhancing the toughness of the matrix [143]. Significant toughness improvement was obtained for WC-ZrO 2 composite by incorporating ZrO 2 particles into WC matrix [109][110][111]. Mukhopadhyay et al [144] reported that WC-6 wt% ZrO 2 exhibited a toughness of 10.9 MPa m 1/2 , which is only modestly lower by 16% in comparison with that of reference WC-6 wt% Co cemented carbide, while the flexure strength enhanced by 18%.…”

Section: Transformation 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: Zirconia (Zro 2 )mentioning

confidence: 99%

Section: Transformation Tougheningmentioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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“…In addition, phase transformation toughening is also a major method to improve the fracture toughness of ceramics 54 . Among this, the most used transformation phase is ZrO 2 55–57 . Under the stress field around a crack tip, metastable tetragonal zirconia becomes the stable monoclinic zirconia phase.…”

Section: Resultsmentioning

confidence: 99%

“…54 Among this, the most used transformation phase is ZrO 2 . [55][56][57] Under the stress field around a crack tip, metastable tetragonal zirconia becomes the stable monoclinic zirconia phase. Due to the volume expansion in the process of phase transformation, compressive stress acts on the crack to hinder the crack propagation, which exerts toughening effect.…”

Section: Mechanical Performances Of the Sintered Bulkmentioning

confidence: 99%

Fabrication and performances of WC‐Co cemented carbide with a low cobalt content

Yang

Wang

Zhang

et al. 2021

Int J Applied Ceramic Tech

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WC-Co cemented carbides with a low cobalt content (≤3 wt.%) were successfully manufactured by the powder metallurgy method. The cobalt content is lower than conventional cemented carbide (3-30 wt.%), which makes the prepared alloys possess excellent hardness. The effects of cobalt content on the densification behavior, phase composition, micromorphology, and mechanical performances of cemented carbides were investigated in detail. The results revealed that all the sintered alloys were almost completely consolidated with a relative density of greater than 98.0%. Moreover, abnormal grain growth was observed, and the inhomogeneity of WC grains decreased with the increment in cobalt content. In order to obtain cemented carbides with homogeneous microstructure and outstanding performances, VC was added to inhibit grain growth. Microstructure and performances were significantly affected by the addition of VC. The maximum Vickers hardness of cemented carbides without the addition of vanadium was 2234 HV30, while the fracture toughness was 7.96 MPa⋅m 1/2 after sintering WC-2 wt.%Co. After adding VC, the ultimate hardness and fracture toughness of WC-3 wt.%Co-0.5 wt.%VC alloy could reach 2200 HV30 and 8.61 MPa⋅m 1/2 , respectively. In addition, the obvious crack deflexion and transgranular behavior can be noticed, which can prevent the extension of crack and achieve an increase in fracture toughness of cemented carbides.

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“… In the meanwhile, ZrO 2 , Y 2 O 3 , Al 2 O 3 or other particles were also added into WC‐based composites in order to enhance their densification and to further improve their mechanical properties in the past years. The mechanical ball milling can introduce nano‐size particles into the mixed powder through the collision wear between balls and tanks while increasing the homogeneous distribution of introduction and additives. However, there is very less information about the incorporation of WC nanoparticles into Si 3 N 4 ceramics, especially by mechanical ball milling up to now.…”

Section: Introductionmentioning

confidence: 99%

New route to improve the flexural strength of silicon nitride ceramics by introducing tungsten carbide nanoparticles

Liu

Zhu

Xie

et al. 2017

Int J Applied Ceramic Tech

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Silicon nitride (Si3N4) ceramics containing various tungsten carbide (WC) content were prepared by spark plasma sintering (SPS) with Al2O3 and Y2O3 as sintering aids, and WC nanoparticles were introduced via the mechanical ball milling method in the present work. The influence of WC nanoparticles’ content on the densification, microstructure, and mechanical properties of such ceramics was investigated. The results showed that the incorporation of WC nanoparticles promoted the densification of Si3N4 ceramics and the growth of β‐Si3N4 grains. In comparison with the specimen without WC nanoparticles (879.9 MPa), the flexural strength of the specimens containing WC nanoparticles increased markedly; a maximum flexural strength of 1367.7 MPa can be achieved at the sintering temperature of 1550°C and the milling time of 36 hours.

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Influence of Grain Refinement on Microstructure and Mechanical Properties of Tungsten Carbide/Zirconia Nanocomposites

Cited by 12 publications

References 32 publications

A Review on Binderless Tungsten Carbide: Development and Application

A Review on Binderless Tungsten Carbide: Development and Application

Fabrication and performances of WC‐Co cemented carbide with a low cobalt content

New route to improve the flexural strength of silicon nitride ceramics by introducing tungsten carbide nanoparticles

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