Papers by Keyword: Erosion Resistance

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Authors: Krzysztof Szymański, Bożena Szczucka-Lasota
Abstract: In the article the manufacturing of new- elaborated thermally sprayed coatings are presented. the structure, chemical or phase composition and selected results of the friction tests of the new elaborated coatings were presented. The microstructure of coatings was obtained by LM microscopy. The presented results confirm, that the new coatings can be used to basic protection to wear condition in the energy boiler.
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Authors: Jun Hyoung Park, Jung Jun Park, Jae Heum Moon, Sung Wook Kim
Abstract: This study investigates the effects of the compressive strength and area ratio of coarse aggregate of concrete for offshore construction on the erosion depth. To evaluate the erosion resistance of concrete, test was performed according to ASTM C 1138 using a plain mix with design strength of 30 MPa using only Portland cement and five other mixes including different quantities of fly ash and blast furnace slag. The test results showed that the erosion depth is influenced not only by the compressive strength but also by the area ratio of coarse aggregate.
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Authors: Anurag Hamilton, Ashok Sharma, Upender Pandel
Abstract: In the present investigation, WC–10Co–4Cr coating was deposited by high velocity oxy-fuel (HVOF) process on CA6NM hydro turbine steel to improve its erosion resistance. The coating was characterized in term of crossectional microstructure, phase, microhardness and fracture toughness using a field emission scanning electron microscope (FESEM), X-ray diffractometer and microhardness tester respectively. Solid particle erosion resistance of the substrate and coating were evaluated by air jet erosion tester at two different impingement angles (30° and 90°). Coating microstructure has shown a homogeneous and well-bonded laminar morphology. The microhardness of the coating was observed more than three times higher than CA6NM substrate. This resulted in significant improvement in erosion resistance of coated CA6NM steel at both impingement angles.
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Authors: John R. Nicholls, Y. Jaslier, D.S. Rickerby
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Authors: Ming Zhong Li, Yong Hu, Fei Chen, Qiang Shen, Lian Meng Zhang
Abstract: In this paper, the molten aluminum erosion resistance of Al2TiO5/Al2O3 composites which were soaked in molten aluminum for long-time were characterized by cross section of microstructure and element distribution of samples. The results show that Al2TiO5/Al2O3 composites have good erosion resistance to molten aluminum.
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Authors: Jian Jun Fan, Yun Jing Song, Zhuo Xin Li
Abstract: There are relevant reports on preparing TiB2 particle reinforced metal matrix composite (MMC) anti-wearing coating by plasma spraying and HVOF spraying methods successfully. The research uses electric arc spraying with low cost and convenient operation to prepare four TiB2 particle reinforced composite coatings with high bonding strength and uniform microstructure. It makes comparative study on elevated temperature erosion actions of coating and 45CT of electric arc spraying. The results indicate the coating has excellent erosion wearing resistance. TiB2 particles in M-TiB2 coating have small size, have good unity with metallic matrix, and are distributed on metallic matrix with high hardness relatively uniformly, and porosity of coating is low. Such MMC coating microstructure feature avoids micro-cutting of coating effectively, and reduces plastic deformation and material transfer of wearing surface. The coating has excellent erosion resistance.
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Authors: Dan Na Qian, An Chang Xu, Li Min Bao, Masayuki Takatera
Abstract: The solid particle erosion behavior of the body materials used in high-speed moving equipments has attracted widely attention from researchers. In order to enhance the erosion resistance of existing FRP materials and to develop new FRP materials with high strength and excellent erosion resistance, we attempted to use VGCF (vapor-grown carbon fiber) with high strength and high modulus as filler for reinforcing UP resin matrix. In this study, VGCFs were treated by UV ozone treatment for improving the interface adhesion, and the effects of the filler weight content, impact angle and impact velocity upon the erosion wear behavior of UP resin composite materials have been carried out. The mechanical properties of composites materials reinforced by VGCF were also evaluated. The results indicate that it is feasible to improve the erosion resistance and flexural properties of UP resin by VGCF filler simultaneously.
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Authors: Xiao Chen
Abstract: MoB/CoCr, a novel material for thermal spraying, with high durability is used to resist erosion by molten Al-12.07wt.%Si alloy. The durability of the MoB/CoCr coating prepared by low pressure plasma spraying (LPPS) has been investigated using a molten-metal immersion tester. The test revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-12.07wt.%Si alloy. Little change of crystal structure, mainly composed of ternary borides of Co2MoB2 and CoMoB, is observed after the immersion test, suggesting that the ternary borides have much higher durability.
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Authors: Yuan Sheng Huang
Abstract: In order to improve both the hardness and the erosion resistance of cast aluminum alloys, nickel-diamond compound coatings were deposited on the alloys by a compound electroless plating process. The morphology, phase structure, hardness, erosion resistance and adhesion of the electroless coating were investigated. The results show that the pretreatment such as removing the silicon in the surface of the alloys, zinc dipping, alkali electroless nickel is necessary. The deposition of an electroless nickel coating without diamond prior to nickel-diamond electroless plating can improves the erosion resistance. A best nickel-diamond compound electroless plating process is found. The hardness of the nickel-diamond compound coating reaches 730 HV. Both the adhesion and erosion resistance of the compound coatings are very good.
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Authors: Xiao Chen, Ren Yuan Zhang, Feng Li
Abstract: MoB/CoCr, a novel material for thermal spraying, with high durability in molten alloys is used to resist erosion by molten Al-Si alloy in solar thermal power generation. The microstructure and phase component of coatings were characterized, and the coatings were also studied on bond strength and thermal shock resistance. The durability of the MoB/CoCr coatings prepared by low pressure plasma spraying (LPPS) has been investigated using a molten-metal immersion tester. The results showed that phase component of powder and coating had little change. The coatings have dense structure and excellent combination with substrate. The main constituents of coatings remain invariant and the coatings have excellent properties of bond strength and thermal shock resistance. The immersion tests revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-12.07wt.%Si alloy.
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