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A novel ultra-high temperature ceramic composite coating prepared by high-speed laser cladding and pack cementation on Ta-W alloys for higher plasma ablation resistance above 2300 °C

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JOURNAL OF ADVANCED CERAMICS 2025年第1期14卷 111-125页

作者： Zhang, Youjiang Deng, Qiyao Li, Yang He, Pengfei Sun, Chuan Bu, Wengang Xing, Yue Cai, Yujun Liang, Xiubing Tianjin Univ Technol & Educ Natl Local Joint Engn Lab Intelligent Mfg Oriented Tianjin 300222 Peoples R China Acad Mil Sci Def Innovat Inst Beijing 100071 Peoples R China

To improve the high-temperature ablation resistance properties of Ta(W) refractory alloys, a novel ultrahigh-temperature ceramic (UHTC) composite coating was prepared by combining the technological advantages of highspeed laser cladding (HSLC) and pack cementation (PC). First, the HSLC process was employed to fabricate a (Hf,Ta)C-Ta(W) UHTC-refractory metal composite coating that had metallurgical bonding with the Ta(W) substrate. Then, the PC process was utilized to transform the refractory metal phase in the coating into the corresponding refractory silicide (RMSi2) phase. Consequently, the (Hf,Ta)C-TaSi2 UHTC composite coating was successfully prepared. This new coating was ablated at a heat flux density of 8.0 MW/m2 for 300 s at a surface temperature of 2300 degrees C, and the structural integrity of the coating was retained. The linear ablation rate of the coating is -0.67 mu m/s. The ablated coating exhibits three distinct oxide layers: a loose HfO2 top layer, a dense HfO2 middle layer, and a slightly oxidized (Hf,Ta)CxOy-Hf-Ta-O glassy layer. The synergistic effect of HfO2 and Hf-Ta-O glassy oxide film endows the coating with excellent anti-ablation resistance. This innovative design of the UHTC-RMSi2 composite coating provides robust protection to the Ta(W) substrate from ultra-high temperature ablation and mechanical scouring.

关键词： high-speed laser cladding pack cementation (PC) Ta-W alloy ultra-high temperature ceramic (UHTC) composite coating ablation resistance

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Ni/AlN composite coating for Corrosion and Elements Interdiffusion Resistance in Molten Fluoride Salts System

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Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1704-1714页

作者： Chengxu Wang Wei Chen Minghui Chen Demin Chen Fuhui Wang School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China

The Ni/AlN composite coating was prepared for increasing corrosion and elements interdiffusion resistance of GH3535 alloy in molten fluoride salts,and the effect of mechanical interlocking on adhesion strength between AlN layer and nickel coating was also *** indicated that the adhesion strength between AlN layer and nickel coating could be significantly enhanced through mechanical interlocking effect,which effectively prevented the nickel coating from flaking off at elevated *** an etching pre-treatment of AlN layer,the corrosion resistance of the Ni/AlN coated GH3535 alloy in molten FLiNaK salt was further improved,and elements interdiffusion between the substrate and nickel coating was completely *** layer as a diffusion barrier remained compact and continuous in Ni/GH3535 system after high-temperature molten salt ***,a Ni-P layer consisting of Ni3P and Ni phases formed in the Ni coating after corrosion.

关键词： Molten salt Superalloy composite coating High temperature corrosion

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Corrosion and wear resistance behaviors of electroless Ni-Cu-P-TiN composite coating

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Rare Metals 2022年第9期41卷 3233-3238页

作者： Hong-Ming Zhou Yang Jia Jian Li Shu-Heng Yao School of Materials Science and Engineering Central South UniversityChangsha410083China Hunan Zhengyuan Institute for Energy Storage Materials and Devices Changsha410083China

composite coating of Ni-Cu-P alloys containing TiN particles was prepared by electroless technique based on the excellent wear resistance of TiN and better anti-corrosion property of electroless Ni-Cu-P alloys on carbon steel *** method which uses Tafel polarization curves was carried out to study the corrosion performance of the *** results indicate that the anti-corrosion ability of the Ni-Cu-P-TiN composite coating(7.92 μA) is almost doubled compared with that of the as-coated Ni-P(13.60 μA).Furthermore,heat treatment results in first increase and then decrease in anticorrosion *** the Ni-Cu-P-TiN composite coatings heat-treated for 40 min have maximum hardness of HV 960 and a self-corrosion current of 28.20 μ*** friction coefficient of electroless composite coatings was measured by end-facing *** is found that the friction coefficient of the Ni-Cu-P-TiN composite coating decreases apparently compared with those of Ni-P and Ni-Cu-P electroless coatings.

关键词： composite coating Wear resistance Anti-corrosion property Tafel polarization curves Hardness Self-corrosion current

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Preparation of Al2O3/Y2O3 composite coating for deuterium permeation reduction

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Journal of Rare Earths 2020年第11期38卷 1237-1242,I0004页

作者： Weijing Wang Qinghe Yu Xiaopeng Liu Zheng Lu National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

A tritium permeation barrier is required in fusion blankets for the reduction of fuel loss and radiological *** this study,an Al2O3/Y2O3 composite coating was prepared on 316 L stainless steel by radiofrequency magnetron sputtering in order to improve the tritium permeation *** microstructure and the phase composition of the Al2O3/Y2O3 composite coating are observed by scanning electron microscopy,transmission electron microscopy and grazing incidence X-ray ***,Auger electron spectroscopy was used to characterize the depth profiles of Al,Y and O *** results clearly indicate that the Al2O3/Y2O3 composite coating is fully dense and the total thickness is approximately 340 *** Al2O3/Y2O3 coating consists of an amorphous Al2O3 and the cubic Y2O3,in which Al,Y and O elements are homogeneously distributed in the vertical base ***,the deuterium permeation property of the Al2O3/Y2O3 composite coating was measured by the gas phase permeation *** results show that the introduction of an interface and the existence of a tiny amount of micro-defects improve the deuterium resistance of the Al2O3/Y2O3 coating,and its deuterium permeation reduction factor is 536-750 at 873-973 ***,it is concluded that the Al2O3/Y2O3 co mposite coating as deuterium permeation barrier can significa ntly enha nce the deuterium permeation resistance property.

关键词： Deuterium Permeation barrier Al2O3 coating Y2O3 coating composite coating Rare earths

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Efficient Preparation of Nanoparticle-Reinforced Nickel-based composite coating with Highly Preferred(220)Orientation

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 187-204页

作者： Renjie Ji Hui Jin Yonghong Liu Tiancong Dong Fan Zhang Lilong Zhao Xinlei Wu Qiang Sun Peng Liu Hang Dong Chi Ma Dege Li Baoping Cai College of Mechanical and Electronic Engineering China University of Petroleum(East China)Qingdao266580China Key Laboratory of Unconventional Oil&Gas Development Ministry of EducationChina University of Petroleum(East China)Qingdao266580China

Nanoparticle-reinforced metal matrix composite coatings have significant potential in mechanical part surface strengthening owing their excellent mechanical *** paper reports a phenomenon in which the grain orientation gradually evolves to(220)as the deposition current density increases when preparing nanoparticle-reinforced nickel-based composite coatings through jet electrodeposition(JED).During the preparation of the Ni-SiC composite coatings,the deposition current density increased from 180 A/dm2 to 220 A/dm2,and TC(220)gradually increase from 41.4%to 97.7%.With an increase of TC(220),the self-corrosion potential increases from−0.575 to−0.477 V,the corrosion current density decreases from 9.52μA/cm^2 to 2.76μA/cm^2,the diameter of the corrosion pits that after 10 days of immersion in a 3.5 wt%NaCl solution decreases from 278–944 nm to 153–260 nm,and the adhesion of the coating increases from 24.9 N to 61.6 *** a conventional electrodeposition(CED),the Ni-SiC composite coating using JED has the advantages of a smooth surface morphology,high corrosion resistance,and strong adhesion,which are more obvious with an increase in TC(220).

关键词： Jet electrodeposition composite coating Preferred orientation Adhesion force Corrosion resistance

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Corrosion resistance and anti-soiling performance of micro-arc oxidation/graphene oxide/stearic acid superhydrophobic composite coating on magnesium alloys

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1128-1139页

作者： Dong Wang Chen Ma Jinyu Liu Weidong Li Wei Shang Ning Peng Yuqing Wen Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China

Magnesium(Mg)alloys,the lightest metal construction material used in industry,play a vital role in future ***,the poor corrosion resistance of Mg alloys in corrosion environments largely limits their potential wide ***,a micro-arc oxidation/graphene oxide/stearic acid(MAO/GO/SA)superhydrophobic composite coating with superior corrosion resistance was fabricated on a Mg alloy AZ91D through micro-arc oxidation(MAO)technology,electrodeposition technique,and self-assembly *** composition and microstructure of the coating were characterized by scanning electron microscopy,X-ray diffraction,energy dispersive spectroscopy,and Raman *** effective protection of the MAO/GO/SA composite coating applied to a substrate was evaluated using potentiodynamic polarization,electrochemical impedance spectroscopy tests,and salt spray *** results showed that the MAO/GO/SA composite coating with a petal spherical structure had the best superhydrophobicity,and it attained a contact angle of 159.53°±2°.The MAO/GO/SA composite coating exhibited high resistance to corrosion,according to electrochemical and salt spray tests.

关键词： magnesium alloy composite coating superhydrophobic corrosion resistance anti-soiling performance

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Preparation and Tribological Properties of Ni-P Electroless composite coating Containing Potassium Titanate Whisker

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Journal of Materials Science & Technology 2007年第3期23卷 387-391页

作者： Yaxu JIN Lin HUA School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

Nickel-phosphorus （Ni-P） composite coatings containing potassium titanate （K2Ti6O13） whiskers （PTWs） were prepared by electroless plating. The surface morphology and component of coatings were investigated by scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDX）, respectively before and after wear test. The tribological performance was evaluated using a pin-on-disk wear tester under dry conditions. It is found that the Ni-P-PTWs composite coatings exhibit higher wear resistance than Ni-P and Ni-P-SiC electroless coatings. The favorable effects of PTWs on the tribological properties of the composite coatings are attributed to the super-strong mechanical properties and the specific tunneling structures of PTWs. The PTWs greatly reinforce the structure of the Ni-P-based composite coatings and thereby greatly reduce the adhesive and plough wear of Ni-P-PTWs composite coatings.

关键词： Potassium titanate whiskers Electroless plating composite coating Tribological properties

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Center Distance and Pouring Temperature on in-situ Synthesis of WC_P/Fe composite coating

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 449-454页

作者：牛立斌 WANG Xiaogang FAN Zimin College of Materials Science and Engnieering Xi'an University of Science and Technology

Tungsten carbide （WC） particles can be in-situ synthesized through the reaction between tungsten wires and molten of gray cast iron. The different composite coatings were obtained by adjusting the pouring temperature and the center distance of tungsten wires, and were comparatively observed by X-ray diffraction, scanning electron microscopy, and two-body abrasive wear tests. The results show that the intensities of the WC peaks increase by the increasing pouring temperature, and firstly become strong and then weak by the increasing center distance. In case of the pouring temperature 1 400 ℃ and the center distance 0.5mm, the formed WC particles present quadrilateral and triangle-structure and are homogenously distributed in the matrix. The wear rate of the composite coatings for stable center distance gradually increases by increasing the loads, however, at a constant pouring temperature, it firstly decreases from 5.91 to 2.97 mg/cm2·h, and slightly increases to 3.98 mg/cm2·h by increasing the center distance.

关键词： composite coating tungsten carbide in-situ synthesis wear

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Corrosion and tribocorrosion resistance of MAO-based composite coating on AZ31 magnesium alloy

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Journal of Magnesium and Alloys 2022年第12期10卷 3406-3417页

作者： Siqin Liu Guihua Li Yuming Qi Zhenjun Peng Yinping Ye Jun Liang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000PR China Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000PR China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049PR China

In this paper, a multi-functional composite coating with low friction coefficient, high wear resistance and excellent tribocorrosion resistance is fabricated on AZ31 Mg alloys by micro-arc oxidation and spray-coating methods. The microstructure, and composition of the coating are characterized by SEM, EDS, XRD, and FT-IR. Potentiodynamic polarization and EIS tests are conducted to evaluate the corrosion resistance of the composite coating. The tribocorrosion property is also studied using pin-on-disk tribometer in 3.5 wt.% Na Cl solution. It is found that the composite coating possesses better long-term corrosion resistance than the single MAO coating. The tribocorrosion tests prove that the composite coating exhibits much better wear and tribocorrosion resistance than the single MAO coating and can protect the substrate from corrosion under a sliding condition.

关键词： Magnesium alloy Micro-arc oxidation composite coating Corrosion Tribocorrosion

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SYNTHESIS, CROSSLINKING MECHANISM AND PROPERTIES OF A POLYACRYLATE/POLYURETHANE composite coating

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Chinese Journal of Polymer Science 1997年第3期15卷 242-247页

作者：唐黎明郭伟周其庠 Department of Chemical Engineering Tsinghua University Beijing 100084

A polyacrylate/polyurethane (P(A)/P(U)) composite coating has been prepared by crosslinking an acetoacetylated polyacrylate with a vinylic group terminated polyurethane at room temperature. A model Michael reaction between ethyl acetoacetate (EAA) and methyl acrylate (MA) was designed to study the crosslinking mechanism. It was found that the two active hydrogen atoms in acetoacetyl group can both add to vinylic groups and the yield of mono-and bis-adducts are much affected by the molar ratio of acetoacetyl to vinylic groups. Higher crosslinking degree and better properties could be obtained with decreasing the molar ratio of the two active groups from 1/1 to 0.6/1 in the composite coatings.

关键词： polyacrylate polyurethane composite coating crosslinking mechanism

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