The Experts below are selected from a list of 38283 Experts worldwide ranked by ideXlab platform
Fuhui Wang - One of the best experts on this subject based on the ideXlab platform.
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an easy processing organic inorganic self lubricating Composite Coating with high corrosion resistance
Progress in Organic Coatings, 2019Co-Authors: Xuelei Xu, Minghui Chen, Cheng Wang, Zhixiong Chen, Jinhui Chen, Fuhui WangAbstract:Abstract Organic Coatings have good mechanical properties and high corrosion resistance, but their poor tribological properties limit their application on transmission components, such as bearings. The purpose of this work is to fabricate an easy-processing organic-inorganic Composite Coating with self-lubrication and high corrosion resistance. Moderate amount of fillers of graphite, SiC and polytetrafluoroethylene (PTFE) were added. Their compatibility with the based resin as well as their influence on tribological, corrosion and mechanical properties of the Composite Coating were investigated. Results indicate that the addition of graphite and SiC is able to reduce friction coefficient and wear rate to a large extent. However, their agglomeration introduces a large number of pores, which decreases adherence strength, impact resistance and corrosion resistance of the resin-based Coating. Due to the high flexibility of PTFE, its addition substantially improves compactness. With a proper ratio between the fillers of graphite, SiC and PTFE, the organic-inorganic Composite Coating possesses a high corrosion resistance, adherence strength and impact resistance. Moreover, its friction coefficient and wear rate are dramatically reduced to 0.07 and 3.22 × 10−5 mm3 N−1 m−1, respectively.
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Development of an oxidation resistant glass-ceramic Composite Coating on Ti-47Al-2Cr-2Nb alloy
Applied Surface Science, 2014Co-Authors: Wenbo Li, Shenglong Zhu, Minghui Chen, Cheng Wang, Fuhui WangAbstract:Three glass-ceramic Composite Coatings were prepared on Ti-47Al-2Cr-2Nb alloy by air spraying technique and subsequent firing. The aim of this work is to study the reactions between glass matrix and inclusions and their effects on the oxidation resistance of the glass-ceramic Composite Coating. The powders of alumina, quartz, or both were added into the aqueous solution of potassium silicate (ASPS) to form slurries used as the starting materials for the Composite Coatings. The Coating formed from an ASPS-alumina slurry was porous, because the reaction between alumina and potassium silicate glass resulted in the formation of leucite (KAlSi2O6), consuming substantive glass phase and hindering the densification of the Composite Coating. Cracks were observed in the Coating prepared from an ASPS-quartz slurry due to the larger volume shrinkage of the Coating than that of the alloy. In contrast, an intact and dense SiO2-Al2O3-glass Coating was successfully prepared from an ASPS-alumina-silica slurry. The oxidation behavior of the SiO2-Al2O3-glass Composite Coating on Ti-47Al-2Cr-2Nb alloy was studied at 900 C. The SiO2-Al 2O3-glass Composite Coating acted as an oxygen diffusion barrier, and prevented the inward diffusion of the oxygen from the air to the Coating/alloy interface, therefore, decreasing the oxidation rate of the Ti-47Al-2Cr-2Nb alloy significantly. © 2013 Elsevier B.V.
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preparation and oxidation behaviour of nanocrystalline ni cralysin Composite Coating with aln diffusion barrier on ni based superalloy k417
Corrosion Science, 2012Co-Authors: Fuhui WangAbstract:A Ni + CrAlYSiN Composite Coating was prepared on a Ni-based superalloy K417 by vacuum arc evaporation, mainly consists of nanocrystalline gamma-Ni, fcc-AlN and fcc-CrN. The oxidation behaviour of the specimens in air at 1000 degrees C for 100 h was studied. A double-layer oxide scale, inner Al2O3 layer and outer mixture layer mainly dominated by NiCr2O4, formed on the Composite Coating. Substantial interdiffusion between the Composite Coating and the substrate was observed. In contrast, a unique alumina scale formed on the Composite Coating with a nanocrystalline hcp-AlN barrier layer, and the interdiffusion between the Composite Coating and the substrate was undetectable. (c) 2012 Elsevier Ltd. All rights reserved.
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Oxidation and hot corrosion behavior of a novel enamel-Al2O3 Composite Coating on K38G superalloy
Surface and Coatings Technology, 2006Co-Authors: Deyou Zheng, Shenglong Zhu, Fuhui WangAbstract:A novel enamel-Al2O3 Composite Coating with a thin NiCoCrAlY bond coat was prepared on K38G superalloy. Results indicated that this Composite Coating exhibited excellent high temperature oxidation resistance at 900 and 1000 °C and hot corrosion resistance in molten sulfate salts at 900 °C, much better than solo NiCoCrAlY Coating and uncoated K38G. The protection mechanism of this Composite Coating was different from those of traditional metallic Coatings. It was no longer oxidized during tests and acted as a barrier to effectively hinder the corrosive species from migrating into substrate. © 2005 Elsevier B.V. All rights reserved.
Tian Ying Xiong - One of the best experts on this subject based on the ideXlab platform.
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A novel bioactive Ta/hydroxyapatite Composite Coating fabricated by cold spraying
Materials Letters, 2019Co-Authors: Junrong Tang, Zhipo Zhao, Housheng Liu, Xinyu Cui, Jiqiang Wang, Tian Ying XiongAbstract:Abstract To avoid the decomposition of hydroxyapatite (HA) and thus further increase its bioactivity, a novel bioactive Ta/HA Composite Coating (∼23 μm) is firstly fabricated by cold spraying mechanical milling Ta/HA Composite powders. The results indicate that HA without decomposition and phase transformation is well contained and evenly distributed in the Composite powders and Coating. The simulated body fluid (SBF) test shows that bone-like apatite layer is mineralized on the surface of Composite Coating after 1–3 days. It demonstrates that the as-prepared Ta/HA Composite Coating has high bioactivity.
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A novel method of fabricating an antibacterial aluminum-matrix Composite Coating doped graphene/silver-nanoparticles
Materials Letters, 2019Co-Authors: Zhipo Zhao, Fanchi Meng, Housheng Liu, Hongyang Liu, Junrong Tang, Jiqiang Wang, Lini Yang, Tian Ying XiongAbstract:Abstract In order to inhibit the breeding and propagation of bacteria and other source of infection, a novel method of fabricating an antibacterial metal matrix Composite Coating was reported. Graphene sheets decorated by silver-nanoparticles were doped in aluminum Composite Coating based on cold spray. The microstructure and antibacterial activity of the Coating were investigated. Graphene sheets with silver-nanoparticles were scattered uniformly in the Coating. Bacteriostatic experiment indicated the Composite Coating had high antibacterial activity. This metal matrix antibacterial Coating avoids the drawbacks of organic Coatings, promising to be used on facilities in hospital, home and laboratory.
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Anticorrosion Properties of Zn–Al Composite Coating Prepared by Cold Spraying
THE Coatings, 2019Co-Authors: Xinqiang Lu, Tian Ying Xiong, Daosheng Wen, Shouren Wang, Gaoqi WangAbstract:In order to slow down the corrosion and wear of offshore equipment, the Zn–Al Composite Coating was prepared on Q345 substrate by cold spray technique. The mass fraction of Zn and Al in the raw material was 2:3. The microstructure of the original Coating was observed by scanning electron microscopy (SEM) and was characterized by energy dispersive spectrometer (EDS). From the Composite alloy Coating obtained by cold spraying, it was observed that the Zn and Al particles were uniformly distributed without oxidation product, and the powder particles were significantly plastically deformed. The microstructure of the Composite Coating is very dense and has strong adhesion to the substrate. Neutral salt spray test (NSS) and electrochemical accelerated corrosion test results showed that Zn–Al Composite Coating can effectively provide corrosion protection.
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A novel TiAl3/Al2O3 Composite Coating on γ-TiAl alloy and evaluating the oxidation performance
Applied Surface Science, 2016Co-Authors: Jiqiang Wang, Ling Yan Kong, Tie Fan Li, Tian Ying XiongAbstract:Abstract A novel TiAl 3 /Al 2 O 3 Composite Coating was prepared on γ-TiAl alloy. The process included two steps: (1) TiAl 3 /Al 2 O 3 Composite powders were prepared by high energy ball milling of pure Al and nano-TiO 2 powders, followed by a heat-treatment; (2) the as-prepared Composite powders were deposited on γ-TiAl substrate by cold spray. The cyclic oxidation was conducted at 900 °C to test the performance of the Composite Coating. The results showed that the Composite Coating had good crack resistance and effectively decreased the oxidation rate of the substrate.
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Oxidation resistance of TiAl3–Al Composite Coating on orthorhombic Ti2AlNb based alloy
Surface & Coatings Technology, 2010Co-Authors: Ling Yan Kong, Tie Fan Li, Xinyu Cui, Jianzhong Qi, Bin Lu, Rui Yang, Tian Ying XiongAbstract:The TiAl(3)-Al Composite Coating on orthorhombic Ti(2)AlNb based alloy was prepared by cold spray. Oxidation in air at 950 degrees C indicated that the bare alloy exhibited poor oxidation resistance due to the formation of TiO(2)/AlNbO(4) mixture and intended to scale off at the TiO(2) rich zone. A nitride layer about 2 mu m was formed under the oxide layer. The oxygen invaded deeply into the alloy and caused severe microhardness enhancement in the near Surface region. The TiAl(3)-Al Composite Coating exhibited Parabolic oxidation kinetics and showed no sign of degradation after oxidized up to 1098 h at 950 degrees C in air under quasi-isothermal condition. No scaling of the Coating was observed after oxidized at 950 degrees C up to the tested 150 cycles. The major oxide in the oxidized Coating was Al(2)O(3). The AlTi(2)N, TiAl and small amount of TiO(2) were also observed in the oxidized Coating. The EPMA and microhardness tests showed that inward oxygen diffusion was prevented by the interlayer, which was formed between the Composite Coating and the substrate during heat-treatment. Microstructure analyses demonstrated that the interlayer play a major role in protecting the substrate alloy from high temperature oxidation and interstitial embrittlement. (C) 2009 Elsevier B.V. All rights reserved.
Tie Fan Li - One of the best experts on this subject based on the ideXlab platform.
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A novel TiAl3/Al2O3 Composite Coating on γ-TiAl alloy and evaluating the oxidation performance
Applied Surface Science, 2016Co-Authors: Jiqiang Wang, Ling Yan Kong, Tie Fan Li, Tian Ying XiongAbstract:Abstract A novel TiAl 3 /Al 2 O 3 Composite Coating was prepared on γ-TiAl alloy. The process included two steps: (1) TiAl 3 /Al 2 O 3 Composite powders were prepared by high energy ball milling of pure Al and nano-TiO 2 powders, followed by a heat-treatment; (2) the as-prepared Composite powders were deposited on γ-TiAl substrate by cold spray. The cyclic oxidation was conducted at 900 °C to test the performance of the Composite Coating. The results showed that the Composite Coating had good crack resistance and effectively decreased the oxidation rate of the substrate.
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Oxidation resistance of TiAl3–Al Composite Coating on orthorhombic Ti2AlNb based alloy
Surface & Coatings Technology, 2010Co-Authors: Ling Yan Kong, Tie Fan Li, Xinyu Cui, Jianzhong Qi, Bin Lu, Rui Yang, Tian Ying XiongAbstract:The TiAl(3)-Al Composite Coating on orthorhombic Ti(2)AlNb based alloy was prepared by cold spray. Oxidation in air at 950 degrees C indicated that the bare alloy exhibited poor oxidation resistance due to the formation of TiO(2)/AlNbO(4) mixture and intended to scale off at the TiO(2) rich zone. A nitride layer about 2 mu m was formed under the oxide layer. The oxygen invaded deeply into the alloy and caused severe microhardness enhancement in the near Surface region. The TiAl(3)-Al Composite Coating exhibited Parabolic oxidation kinetics and showed no sign of degradation after oxidized up to 1098 h at 950 degrees C in air under quasi-isothermal condition. No scaling of the Coating was observed after oxidized at 950 degrees C up to the tested 150 cycles. The major oxide in the oxidized Coating was Al(2)O(3). The AlTi(2)N, TiAl and small amount of TiO(2) were also observed in the oxidized Coating. The EPMA and microhardness tests showed that inward oxygen diffusion was prevented by the interlayer, which was formed between the Composite Coating and the substrate during heat-treatment. Microstructure analyses demonstrated that the interlayer play a major role in protecting the substrate alloy from high temperature oxidation and interstitial embrittlement. (C) 2009 Elsevier B.V. All rights reserved.
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Preparation of TiAl3-Al Composite Coating by cold spraying
Transactions of Nonferrous Metals Society of China (English Edition), 2009Co-Authors: Li Shen, Ling Yan Kong, Tian Ying Xiong, Hao Du, Tie Fan LiAbstract:TiAl3-Al Coating was deposited on orthorhombic Ti2AlNb alloy substrate by cold spraying with the mixture of pure Al and Ti as the feedstock powder at a fixed molar ratio of 3:1 when the spraying distance, gas temperature and gas pressure for the process were 10 mm, 250 °C and 1.8 MPa, respectively. The as-sprayed Coating was then subjected to heat treatment at 630 °C in argon atmosphere for 5 h at a heating rate of 3 °C/min and an argon gas flow rate of 40 mL/min. The obtained TiAl3-Al Composite Coating is about 212 μm with a density of 3.16 g/cm3and a porosity of 14.69% in general. The microhardness and bonding strength for the Composite Coating are HV525 and 27.12 MPa. © 2009 The Nonferrous Metals Society of China.
Shan Ping Lu - One of the best experts on this subject based on the ideXlab platform.
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microstructure and bonding strength of wc reinforced ni base alloy brazed Composite Coating
Surface & Coatings Technology, 2002Co-Authors: Shan Ping Lu, Oh-yang KwonAbstract:Abstract A tungsten carbide (WC) reinforced NiCrBSi(Co) Composite Coating was produced on mild steel by high temperature vacuum brazing. The microstructure, phases present and the interface diffusion have been investigated. The cobalt coated on the surface of WC particles dissolved into the liquid nickel-base alloy but the WC was not decomposed severely during the vacuum brazing process. Microanalysis showed that the Composite Coating matrix was composed of γ-Ni solution and γ-Ni+(Ni,Co) 3 B lamellar eutectic. Diffusion and metallurgical reaction occurred at the WC/NiCrBSi(Co) interface and Composite Coating/substrate interface. A 6-μm thick brazing seam or interfacial bonding zone was found between the Coating and the substrate as the coated sample cooled down. Bonding strengths of the WC/NiCrBSi(Co) interface and the Composite Coating/substrate interface reached 100–140 MPa and 300–360 MPa, respectively, which are far higher than those of thermal spray Coating. The abrasive wear resistance of brazed Composite Coating also appears to be better than that of the flame overlaid at the same composition.
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Microstructure and bonding strength of WC reinforced Ni-base alloy brazed Composite Coating
Surface and Coatings Technology, 2002Co-Authors: Shan Ping Lu, Oh-yang KwonAbstract:A tungsten carbide (WC) reinforced Ni-Cr-B-Si(Co) Composite Coating was produced on mild steel by high temperature vacuum brazing. The microstructure, phases present and the interface diffusion have been investigated. The cobalt coated on the surface of WC particles dissolved into the liquid nickel-base alloy but the WC was not decomposed severely during the vacuum brazing process. Microanalysis showed that the Composite Coating matrix was composed of γ-Ni solution and γ-Ni + (Ni,Co)3B lamellar eutectic. Diffusion and metallurgical reaction occurred at the WC/NiCrBSi(Co) interface and Composite Coating/ substrate interface. A 6-μm thick brazing seam or interfacial bonding zone was found between the Coating and the substrate as the coated sample cooled down. Bonding strengths of the WC/NiCrBSi(Co) interface and the Composite Coating/substrate interface reached 100-140 MPa and 300-360 MPa, respectively, which are far higher than those of thermal spray Coating. The abrasive wear resistance of brazed Composite Coating also appears to be better than that of the flame overlaid at the same composition. © 2002 Elsevier Science B.V. All rights reserved.
Oh-yang Kwon - One of the best experts on this subject based on the ideXlab platform.
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microstructure and bonding strength of wc reinforced ni base alloy brazed Composite Coating
Surface & Coatings Technology, 2002Co-Authors: Shan Ping Lu, Oh-yang KwonAbstract:Abstract A tungsten carbide (WC) reinforced NiCrBSi(Co) Composite Coating was produced on mild steel by high temperature vacuum brazing. The microstructure, phases present and the interface diffusion have been investigated. The cobalt coated on the surface of WC particles dissolved into the liquid nickel-base alloy but the WC was not decomposed severely during the vacuum brazing process. Microanalysis showed that the Composite Coating matrix was composed of γ-Ni solution and γ-Ni+(Ni,Co) 3 B lamellar eutectic. Diffusion and metallurgical reaction occurred at the WC/NiCrBSi(Co) interface and Composite Coating/substrate interface. A 6-μm thick brazing seam or interfacial bonding zone was found between the Coating and the substrate as the coated sample cooled down. Bonding strengths of the WC/NiCrBSi(Co) interface and the Composite Coating/substrate interface reached 100–140 MPa and 300–360 MPa, respectively, which are far higher than those of thermal spray Coating. The abrasive wear resistance of brazed Composite Coating also appears to be better than that of the flame overlaid at the same composition.
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Microstructure and bonding strength of WC reinforced Ni-base alloy brazed Composite Coating
Surface and Coatings Technology, 2002Co-Authors: Shan Ping Lu, Oh-yang KwonAbstract:A tungsten carbide (WC) reinforced Ni-Cr-B-Si(Co) Composite Coating was produced on mild steel by high temperature vacuum brazing. The microstructure, phases present and the interface diffusion have been investigated. The cobalt coated on the surface of WC particles dissolved into the liquid nickel-base alloy but the WC was not decomposed severely during the vacuum brazing process. Microanalysis showed that the Composite Coating matrix was composed of γ-Ni solution and γ-Ni + (Ni,Co)3B lamellar eutectic. Diffusion and metallurgical reaction occurred at the WC/NiCrBSi(Co) interface and Composite Coating/ substrate interface. A 6-μm thick brazing seam or interfacial bonding zone was found between the Coating and the substrate as the coated sample cooled down. Bonding strengths of the WC/NiCrBSi(Co) interface and the Composite Coating/substrate interface reached 100-140 MPa and 300-360 MPa, respectively, which are far higher than those of thermal spray Coating. The abrasive wear resistance of brazed Composite Coating also appears to be better than that of the flame overlaid at the same composition. © 2002 Elsevier Science B.V. All rights reserved.