Correlation of Microstructures and Tribological Properties of Ferrous Coatings Deposited by Atmospheric Plasma Spraying on Al-Si Cast Alloy Substrate

Abrasion wear resistance is very important in many applications and it is not a surprise that there are many laboratory test methods for its determination. In this article, a possibility of the abrasive wear resistance determination with scratch tester, as a relatively easy and quick test method, was analysed and compared with the standard test method for pin abrasion testing (ASTM G 132). Materials used in the tests were: two ferrous-based coatings (deposited on an Al-Si alloy substrate with atmospheric plasma spraying), two aluminium-based composite materials with 10 wt% of Al 2 O 3 reinforcements (produced with compocasting technique) and grey cast iron, known as a material with good abrasive wear resistance. Coefficient of friction and wear of the samples were investigated with both abrasion wear test methods and analysed in correlation with their mechanical properties.

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“…The target coating thickness was 200-300 lm. Details of the technology process and spray conditions are described elsewhere [21].…”

Section: Methodsmentioning

confidence: 99%

Possibility of the Abrasive Wear Resistance Determination with Scratch Tester

et al. 2009

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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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“…Automobile lightweight body material usage is also put forward higher request, on the premise of ensuring strength and stiffness of the automobile parts material, makes the weight of the parts is lighter, is an effective way of lightweight automobile body. The use of aluminum, magnesium alloy and high strength plastic, gets a better solution to this problem, at the same time, it is widely used in the world automobile industry (Vencl A et al, 2009) (Wang M, 2008) (Wen S Z. 2008).…”

Section: The Development Trend Of Automobile Body Lightweightmentioning

confidence: 99%