Feasibility of preparing Mo 2 FeB 2 -based cermet coating by electrospark deposition on high speed steel

Wei, Xiang; Chen, Zhiguo; Zhong, Jue; Xiang, Yanhong

doi:10.1016/j.surfcoat.2016.03.090

Cited by 35 publications

(8 citation statements)

References 21 publications

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“…With respect to the fabrication techniques of M 3 B 2 cermet coatings, several surface modification methods can be taken advantage of, such as high-velocity oxy-fuel (HVOF), detonation gun spraying, electrospark deposition, flame spraying, vacuum powder sintering, plasma spraying, and laser surface cladding [17][18][19][20][21][22][23]. These methods can provide a lot of energy for the reactive synthesis of M 3 B 2 cermet coatings.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of M3B2-Type Boride-Based Cermet Coatings Prepared by Laser Cladding Synthesis

Zhao

2019

Coatings

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Although Q235 steel materials are widely used in offshore engineering, the service life is severely shortened by its inferior resistance to wear and corrosion in harsh marine working environments. Boride-based cermet composites could be a good surface-protective coating to enhance surface hardness, wear resistance, and corrosion resistance. M3B2 (M: Mo, Ni, Fe, Cr) boride-based cermet coatings composed of hard ceramics of M3B2-type complex borides and an {Fe, Ni} metal matrix was fabricated on Q235 steels with mixed Mo, Cr, B, and Ni60 powders using a laser cladding synthesis technique. The influences of laser cladding parameters on the microstructure, phase composition, microhardness, and corrosion resistance of the coatings were comprehensively investigated. Results showed that the microstructures of the coatings mainly consisted of three layers, which were, from the top to bottom layer, a metal layer with fewer ceramic phases, a ceramic layer with fewer metal phases, and another metal layer with fewer ceramic phases. The ceramic phases were mainly M3B2-type borides, and the metal phases were mainly {Fe, Ni} alloys. The appearance of Fe-enriching metal phases was due to the supply of Fe elements from Q235 substrates. With squash pretreatment and without a remelting aftertreatment, ceramics uniformly dispersed in the cermet coatings, and their sizes decreased. The results of microhardness showed that the microhardness of the coating first increased and then decreased from the top layer to the bottom layer, and maximum microhardness was obtained in the layer of ceramics with less metal phases. An electrochemical corrosion test showed that the cermet coatings (jcorr = 6.35 μA/cm2) could improve the corrosion resistance of Q235 steels (j = 43.76 μA/cm2) by one order of magnitude.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of M3B2-Type Boride-Based Cermet Coatings Prepared by Laser Cladding Synthesis

Zhao

2019

Coatings

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“…Metal-based ceramics such as Mo 2 NiB 2 , Mo 2 FeB 2 and WCoB were initially prepared by Takagi using the reaction sintering technique [4]. Moreover, Mo 2 FeB 2 has attracted widespread attention because of its low cost, excellent high-temperature hardness, strength, and good wear resistance and corrosion resistance [4][5][6][7][8]. Yu et al used vacuum sintering technology to prepare Mo 2 FeB 2 through the reaction 2Mo + 2Fe2B = Mo 2 FeB 2 + 3Fe, which is a major breakthrough in the application of Mo 2 FeB 2 [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of TiC on Microstructure and Properties of Wear-Resistant Mo2FeB2 Claddings

Sun

Jin

et al. 2022

Materials

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Alloy blocks with different TiC content were designed, and Mo2FeB2 cermets were prepared by carbon arc surfacing process. The interaction law of TiC content and the microstructure, phase, composition, hardness and wear resistance of the cladding were studied in detail by the combination of experiment and theoretical analysis. On the other hand, the phase transition process of the weldpool is theoretically analyzed by thermodynamic calculation method. XRD test results show that in addition to Mo2FeB2 synthesized in situ, the cladding also forms phases such as TiC, CrB, MoB and Fe-Cr. The number of Mo2FeB2 hard phases gradually increases when TiC content varies from 0% to 15%. The average microhardness of the cladding with 0%, 5%, 10%, and 15% TiC was 992 HV0.5, 1035 HV0.5, 1018 HV0.5 and 689 HV0.5, respectively, with 5% TiC being the largest. Moreover, the cladding with 5% TiC content has excellent wear resistance, which is 14.6 times that of the substrate.

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“…Obtaining both ultra-thin and thicker coatings is possible with this method [20]. It was used previously for improving many substrates, such as titanium and its alloys [21][22][23][24], steels [20,[25][26][27][28][29][30], copper and its alloys [31,32]. Also, as most hard coatings like WC [19,20,22,26,27,33], TiN [34], TiB2 [32,35] and even high entropy alloys' coating [23,24,29], it has been described in the literature.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Corrosion Resistance of WC-Co Coating on AZ91 Applied by Electro Spark Deposition

Tabrizi

Pouzesh

Laleh

et al. 2020

Powder Metallurgy Progress

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In order to enhance the surface properties of a magnesium-based substrate, WC-Co coating was applied on AZ91 alloy by electro spark deposition (ESD), successfully for the first time. The optimum parameters of the ESD process were achieved, based on the corrosion behavior and calculated corrosion rate of the coated samples when 5kHz and 25 A were chosen. For evaluation of the corrosion performance of the achieved WC-Co layers, polarization, and electrochemical impedance spectroscopy tests were carried out in the 3.5 wt % Na3PO4 solution at room temperature. Polarization results show that the corrosion rate (mpy) is in the optimum condition almost half of a bulk sample of uncoated AZ91. Field emission scanning electron microscopy (FE-SEM) was used to examine the surface morphology of applied coatings. These results show that at a lower current, the amount of deposited WC-Co was reduced. The maximum surface microhardness obtained was 193 HV0.2.

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Feasibility of preparing Mo 2 FeB 2 -based cermet coating by electrospark deposition on high speed steel

Cited by 35 publications

References 21 publications

Microstructure and Properties of M3B2-Type Boride-Based Cermet Coatings Prepared by Laser Cladding Synthesis

Microstructure and Properties of M3B2-Type Boride-Based Cermet Coatings Prepared by Laser Cladding Synthesis

Effect of TiC on Microstructure and Properties of Wear-Resistant Mo2FeB2 Claddings

Evaluation of the Corrosion Resistance of WC-Co Coating on AZ91 Applied by Electro Spark Deposition

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