A study of high velocity oxy-fuel thermally sprayed tungsten carbide based coatings. Part 1: Microstructures

Verdon, C.; Karimi, A.; Martin, Jean‐Louis

doi:10.1016/s0921-5093(97)00759-4

Cited by 288 publications

(136 citation statements)

References 24 publications

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“…In addition, the XRD diffraction pattern of suspension sprayed WC-12Co coating from powder 1 (P1C) in this work resembles those of Detonation Gun Spray (DGS) coatings, sprayed with excess of oxygen [18], or from coatings prepared from strongly carbon-deficient powders [41]. Both W 2 C and metallic tungsten are often detected in as-sprayed WC-Co coatings [25], including earlier studies of Verdon et al [42] and Stewart et al [43]. Both studies [42,43] investigated the formation of WC-Co coatings with HVOF spray processes which are comparable with the spray process in the current study, using conventional and nanostructured agglomerated and sintered feedstock powders.…”

Section: Tem Investigations Indicated Nanosized Particles Inmentioning

confidence: 56%

“…Both W 2 C and metallic tungsten are often detected in as-sprayed WC-Co coatings [25], including earlier studies of Verdon et al [42] and Stewart et al [43]. Both studies [42,43] investigated the formation of WC-Co coatings with HVOF spray processes which are comparable with the spray process in the current study, using conventional and nanostructured agglomerated and sintered feedstock powders. Stewart et al [43] have shown that the formation of metallic tungsten depends on the carbide grain size.…”

Section: Tem Investigations Indicated Nanosized Particles Inmentioning

confidence: 80%

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Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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The potential to improve the tribomechanical performance of HVOF-sprayed WC-12Co coatings was studied by using aqueous WC-12Co suspensions as feedstock. Both as-sprayed and hot-isostatic-pressed (HIPed) coatings were studied. Mathematical models of wear rate based on the structure property relationships, even for the conventionally sprayed WC-Co hardmetal coatings, are at best based on the semiempirical approach. This paper aims to develop these semiempirical mathematical models for suspension sprayed nanocomposite coatings in as-sprayed and heat-treated (HIPed) conditions. Microstructural evaluations included transmission electron microscopy, X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy. The nanohardness and modulus of the coated specimens were investigated using a diamond Berkovich nanoindenter. Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that the HIPing post-treatment resulted in crystallization of amorphous coating phases and increase in elastic modulus and hardness. Influence of these changes in the wear mechanisms and wear rate is discussed. Results are also compared with conventionally sprayed high-velocity oxy-fuel hardmetal WC-Co coatings.

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Section: Tem Investigations Indicated Nanosized Particles Inmentioning

confidence: 56%

Section: Tem Investigations Indicated Nanosized Particles Inmentioning

confidence: 80%

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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“…Both W 2 C and metallic tungsten are often detected in the as-sprayed WC-Co coatings [46], including earlier studies of Verdon et al [47] and Stewart et al [48]. Both studies [47,48] investigated the formation of WC-Co coatings with HVOF spray processes which were identical or comparable with the spray process in the current study, using conventional and nanostructured agglomerated and sintered feedstock powders.…”

Section: Comparison Of S-hvof Coatings Observed Inmentioning

confidence: 77%

“…Both studies [47,48] investigated the formation of WC-Co coatings with HVOF spray processes which were identical or comparable with the spray process in the current study, using conventional and nanostructured agglomerated and sintered feedstock powders. Stewart et al [48] have shown that the formation of metallic tungsten depends on the carbide grain size.…”

Section: Comparison Of S-hvof Coatings Observed Inmentioning

confidence: 99%

Sliding wear investigation of suspension sprayed WC–Co nanocomposite coatings

Ahmed

Ali

Faisal

et al. 2015

Wear

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Sliding wear evaluation of nanostructured coatings deposited by Suspension High Velocity OxyFuel (S-HVOF) and conventional HVOF (Jet Kote (HVOF-JK) and JP5000 (HVOF-JP)) spraying were evaluated. S-HVOF coatings were nanostructured and deposited via an aqueous based suspension of the WC-Co powder, using modified HVOF (TopGun) spraying. Microstructural evaluations of these hardmetal coatings included X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray Spectroscopy (EDX). Sliding wear tests on coatings were conducted using a ball-on-flat test rig against steel, silicon nitride (Si 3 N 4 ) ceramic and WC-6Co balls. Results indicated that nanosized particles inherited from the starting powder in S-HVOF spraying were retained in the resulting coatings. Significant changes in the chemical and phase composition were observed in the S-HVOF coatings. Despite decarburization, the hardness and sliding wear resistance of the S-HVOF coatings was comparable to the HVOF-JK and HVOF-JP coatings. The sliding wear performance was dependent on the ball-coating test couple. In general a higher ball wear rate was observed with lower coating wear rate. Comparison of the total (ball and coating) wear rate indicated that for steel and ceramic balls, HVOF-JP coatings performed the best followed by the S-HVOF and HVOF-JK coatings. For the WC-Co ball tests, average performance of S-HVOF was better than that of HVOF-JK and HVOF-JP coatings. Changes in sliding wear 1 Corresponding author R.Ahmed@hw.ac.uk 2 behavior were attributed to the support of metal matrix due to relatively higher tungsten, and uniform distribution of nanoparticles in the S-HVOF coating microstructure. The presence of tribofilm was also observed for all test couples.

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“…Bu nedenle sert dolgu alaşımlarının abrazif aşınma dirençlerini belirlerken, hem matrisin hem de matris içindeki sert partiküllerin sertlikleriyle, bu sert partiküllerin matris içindeki boyutları, morfolojileri ve kimyasal kompozisyonları birlikte ilişkilendirilmelidir [15]. Numune 5'in XRD sonuçlarına göre (Şekil 6) sert dolgu içinde Cr esaslı M 7 C 3 karbürünün yanı sıra Mo ve W esaslı MC karbürleri de gözlemlenmiştir [1,[23][24][25][26][27][28][29]. Molibden ve tungsten matris içinde sert karbürler oluşturduğu için [30] numune 5'in abrazif aşınmaya direncinin yüksek çıkmasını M 7 C 3 karbürleri ile birlikte sağladığı düşünülmektedir.…”

Section: Sert Dolguların İç Yapı Karakteristikleri Ve Xrd Analizleri unclassified

Kli̇nker Ve Fari̇ni̇n Aşindirici Olduğu Koşullarda Çi̇mento Üreti̇mi̇nde Öğütücü Olarak Kullanilan Demi̇r Esasli Sert Dolgu İle Kaplanmiş Aşinma Plakalarinin Abrasi̇f Aşinma Di̇rençleri̇ni̇n Beli̇rlenmesi̇

Gençer¹,

Owsalou²,

Karadeniz³

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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According to tribology theories and wear mechanisms, several techniques are used for preventing and reducing wear. In repair-maintenance welding which is one of these methods, surface of main material is covered with wear high resistant hardfacing materials and thus, materials can be used again in industry. The aim of this experimental study is determining of influences of farin (cement's raw material) and clinker (cement's semi finished product) on abrasive wear conditions of wear plates that were coated with hardfacing alloy and used as grinders in cement production. Coatings were deposited onto EU S355JO steel plates with shielded metal arc welding (SMAW) method by using five different commercial hardfacing electrode. Abrasive wear tests were done with dry sand-rubber wheel abrasive wear testing machine according to Procedure A indicated in ASTM G65 test standard. However in wear tests, farin and clinker abrasives were used instead of quartz abrasives which as stated in ASTM G65 standard. Thus, determination of abrasive wear resistances of wear plates were become more realistic. Microstructure examinations were done by using optical microscopy (OM) and scanning electron microscopy (SEM). Additionally, formed phases in hardfacing coatings were determined by X-ray diffraction (XRD) analysis for supporting microstructure examinations. Vickers hardness measurements of coatings were done in room temperature. 0.17341/gummfd.48584

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A study of high velocity oxy-fuel thermally sprayed tungsten carbide based coatings. Part 1: Microstructures

Cited by 288 publications

References 24 publications

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Sliding wear investigation of suspension sprayed WC–Co nanocomposite coatings

Kli̇nker Ve Fari̇ni̇n Aşindirici Olduğu Koşullarda Çi̇mento Üreti̇mi̇nde Öğütücü Olarak Kullanilan Demi̇r Esasli Sert Dolgu İle Kaplanmiş Aşinma Plakalarinin Abrasi̇f Aşinma Di̇rençleri̇ni̇n Beli̇rlenmesi̇

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