Microstructure and tribological properties of cobalt-based Stellite 6 alloy coating by electro-spark deposition

Jing, Qi-Feng; Tan, Yaohua

doi:10.1590/s1516-14392013005000082

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…As an example, a TiC coating was prepared by ESD with 100 μm thickness. 21 Varieties of coatings have been prepared by ESD, such as Co-stellite 6, 22 Ti6Al4V (Ref. 23) and TiC coatings.…”

Section: Introductionmentioning

confidence: 99%

Study on self-lubricating coating prepared by electrospark deposition

Cao

Xiao

2015

Materials Science and Technology

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It is still a matter to get thick self-lubricating coating with good tribological properties and strong bond. In the present work, Cu/BN coating was produced by electrospark deposition on mild steel. Chemical compatibility of Cu/BN/steel was analysed. The effects of the electric capacitance and deposition time on coating performance were studied, and the microscopic morphologies and structure of the coating were analysed. The results showed that there were no reactions in Cu/BN/ steel. With the increase in capacitance, the surface roughness, friction coefficient and wear mass loss all increased. With the increase in deposition time, the surface roughness increased. Scanning electron microscope images showed that the lubricating coating is smooth, and thick coating (y100 mm) was formed with metallurgical bond. IntroductionFriction is a common phenomenon in nature, and friction and wear are the main causes of high energy consumption in industrial production. 1 Friction causes a large amount of mechanical energy loss, while wear is an important reason for machinery failure. According to statistics, friction accounts for 30% of the energy consumption in industrialised countries. One important way to reduce friction coefficient and improve wear resistance is to use self-lubricating coatings on the surface of the friction pair. 2,3 Self-lubricating coatings can improve tribological performance of contacting surfaces and extend component lifetime. 4 Researchers have been studying self-lubricating coatings prepared by different methods, including chemical vapour deposition (CVD), 5 physical vapour deposition (PVD), 6-8 thermal spraying, 9,10 laser cladding, 11,12 sol-gel 13 and so on. So far, CVD and PVD are the most popular ways to prepare self-lubricating coatings. However, these coatings have small thickness of only several up to .10 mm. 5,6,14 These coatings also have low bonding strength between the coating and substrate, which causes the coatings to easily fall off. In addition, CVD can cause serious environmental pollution. On the other hand, their production cost is very high due to deposition procedure and conditions. 9 Currently, it is still challenging to obtain thick coatings with high bonding strength and good tribological performance.Electrospark deposition (ESD) is a microarc welding process. In the ESD process, a short duration plasma arc with high temperature is generated to melt the electrode surface and transfer a small amount of molten electrode material to a contacting substrate surface. 15,16 Electrospark deposition is a simple, cost effective and low energy technique, 16 which has some merits, 17-19 such as high energy density, low heat input, no environmental pollution, little heat affected zone and no deformation. What is more, metallurgical combination and thick films can be formed between coatings and substrates, 20 resulting in an improved coating adhesion compared to PVD and CVD. As an example, a TiC coating was prepared by ESD with 100 mm thickness. 21 Varieties of coatings have been prepare...

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“…As an example, a TiC coating was prepared by ESD with 100 μm thickness. 21 Varieties of coatings have been prepared by ESD, such as Co-stellite 6, 22 Ti6Al4V (Ref. 23) and TiC coatings.…”

Section: Introductionmentioning

confidence: 99%

Study on self-lubricating coating prepared by electrospark deposition

Cao

Xiao

2015

Materials Science and Technology

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“…4). Some studies indicated that carbides in Co-based alloys often occurred in the form of M 23 C 6 (M = Co, Cr, Mo) [14][15][16] . In this experiment, it was found that the content of Cr in carbides reached to 63.33% (point A in Fig.…”

Section: Microstructuresmentioning

confidence: 99%

Effect of Solid Solution Temperature on Microstructure and Corrosion Resistance of CoNiCrMo Alloy

et al. 2019

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Influence of solid solution temperature on microstructures and corrosion properties of CoNiCrMo alloy were investigated by means of optical microscopy (OM), scanning electron microscope (SEM) and electronic differential system. The corrosion resistance of CoNiCrMo alloy in 0.9%NaCl aqueous solution was also investigated. The results indicated that with the increase of solution treatment temperature, the dendrites of CoNiCrMo alloy gradually disappeared. Thus, the corrosion resistance of the alloy decreased. When the solution temperature is 1200°C, the dendrites almost disappeared and most carbide dissolved, and begins to spheroidization. The corrosion resistance of CoNiCrMo alloy treated at 1000°C for 1h is the highest than the one at 1100 °C and 1200°C. Its self-corrosion potential is-424mV and self-corrosion current density is 1.02×10-8 A/cm 2 .

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“…Cobalt-based alloy powder is a self-fluxing alloy powder, which is a cemented carbide that can resist various wear and corrosion [31][32][33]. It also has the advantages of high strength, thermal fatigue resistance, high temperature oxidation resistance and thermal shock resistance [33][34][35][36][37]. It is currently widely used in power generation, marine, automotive, aerospace, oil and gas industries, especially in poorly lubricated, high-temperature and corrosive environments [35].…”

Section: Introductionmentioning

confidence: 99%

Improvement of impact wear properties of seat insert by laser cladding cobalt-based alloy

Qu¹,

Duan²,

Hu³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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The impact wear properties of two different contact pairs, N80A valve-cast iron seat insert (cast iron group) and N80A valve-clad seat insert (cladding group), were studied in this work. In this paper, an independently designed tribo-tester combined with a depth gauge and corresponding auxiliary devices can record the axial subsidence of the contact pairs during the entire worn process. The results showed that during the 5 × 106 impact test, cast iron groups and cladding groups followed the worn process curve, and all went through the running-in stage and the stable worn stage. However, at each stage, the subsidence of cladding groups was smaller than that of cast iron groups. The roughness meter not only recorded the roughness of all samples before and after the test, but also can obtain the respective subsidence of the samples through the difference between the profiles before and after the test. The results can be mutually corroborated with the axial subsidence measured by the depth gauge. As a result, the roughness of the sealing surfaces of all valve-seat inserts increased significantly after the impact test. The total worn subsidence of the cast iron groups was about 1.61 times that of the cladding groups. The worn morphology was further studied by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The cast iron group mainly experienced serious adhesive wear and oxidation wear, while the cladding group mainly experienced fatigue wear, oxidative wear and abrasive wear.

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Microstructure and tribological properties of cobalt-based Stellite 6 alloy coating by electro-spark deposition

Cited by 11 publications

References 6 publications

Study on self-lubricating coating prepared by electrospark deposition

Study on self-lubricating coating prepared by electrospark deposition

Effect of Solid Solution Temperature on Microstructure and Corrosion Resistance of CoNiCrMo Alloy

Improvement of impact wear properties of seat insert by laser cladding cobalt-based alloy

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