热喷涂制备铁基非晶合金涂层的研究进展

描述了典型的Fe基非晶合金体系及分类,阐述了热喷涂技术制备Fe基非晶合金涂层的性能(尤其是耐磨性和耐蚀性),指出了Fe基非晶合金涂层在制备、性能和相关形成机理方面存在的问题,指出今后应向如何制备高非晶含量Fe基非晶合金涂层和探究非晶合金涂层形成机理的方向进一步努力。     

热喷涂陶瓷涂层的耐磨应用及涂层结构调控方法

因涂层材料适用范围广、基材适应性强、工艺灵活等特点,热喷涂陶瓷涂层作为一类新型耐磨涂层已经在很多领域获得成功应用。然而,现代工业发展对耐苛刻条件下严酷磨损的高性能耐磨涂层提出了越来越高的需求,如何通过材料?工艺的整体技术体系进行涂层结构的有效调控,成为涂层技术领域的重要研究课题之一。本文在简要介绍热喷涂陶瓷涂层作为耐磨涂层应用现状的基础上,提取出对涂层耐磨性具有普遍意义的层内扁平粒子间界面结合这一重要的涂层结构本质特征,明确了涂层内扁平粒子间界面强化的基本思路,阐述了基于界面同质强化和界面异质强化的两条思路进行层间结合界面强化的研究进展,以期为面向更高耐磨性能的热喷涂陶瓷涂层的材料选择、结构设计以及工艺优化提供有益参考。     

热喷涂纳米陶瓷涂层研究进展

由于纳米材料独特的表面效应、体积效应及量子尺寸效应，其电学、力学、磁学、光学和等性能产生了惊人的变化，随着纳米材料科学技术的深入发展，倍受关注的将是纳米材料的结构化问题，有可能从纳米材料中获益的是通过热喷涂方法沉积涂层，本文附近来热喷涂纳米陶瓷涂层的研究进展进行了综述，并对其发展和应用前景作了展望。     

热喷涂陶瓷涂层

综述了陶瓷涂层的热喷涂制备方法、工艺特点、性能评价以及陶瓷涂层在各领域中的应用,分析了热喷涂陶瓷涂层存在的问题和解决方法,并对其发展趋势进行了展望。     

抗冲蚀性热喷涂金属陶瓷涂层研究进展

热喷涂技术是利用热源加热喷涂材料在基体表面制备涂层的方法。火焰喷涂、等离子喷涂和电弧喷涂是常用的热喷涂技术。金属陶瓷兼有陶瓷材料的高硬度、高熔点及金属的韧性等优点,常用于制备材料表面抗冲蚀涂层,其中WC系和Cr_3C_2系金属陶瓷较为常用。冲蚀工艺参数、喷涂工艺参数、喷涂材料性能对金属陶瓷涂层的抗冲蚀性能均有影响。如何通过调控材料结构和喷涂工艺参数是提高金属陶瓷涂层抗冲蚀性的关键。     

热喷涂涂层孔隙率的降低方法

简述了解决热喷涂涂层多孔隙问题的几种途径，主要为热喷涂工艺的改进、重熔处理、新热喷涂材料的开发和封孔处理。     

陶瓷涂层热喷涂制备工艺

热喷涂陶瓷涂层将陶瓷材料耐高温、耐磨、耐腐蚀及隔热、绝缘等性能与金属材料的特点有机地结合起来。本文介绍了陶瓷涂层的热喷涂方法及工艺。     

热喷涂纳米陶瓷涂层的应用

采用热喷涂技术制备纳米结构涂层是构筑纳米结构材料最具前途的方法之一,本文综述了热喷涂陶瓷涂层材料的性能、制备方法及应用方面的研究现状,并对热喷涂纳米陶瓷涂层面临的问题及研究的发展趋势进行了讨论。     

热喷涂耐磨涂层残余应力及其对耐磨性能影响的研究现状

主要围绕热喷涂耐磨涂层的残余应力及其与耐磨性能的关系的研究现状进行了综述.基于热喷涂技术原理,简要介绍了热喷涂涂层结构特点、残余应力的产生机制和影响因素,并总结评价了目前涂层残余应力的检测手段和局限性;重点介绍了涂层残余应力在摩擦服役过程中的演变,以及残余应力对涂层摩擦磨损性能的影响两个方面的研究现状;最后指出将残余应...     

Wear-resistant ceramic coatings deposited by liquid thermal spraying

As a surface strengthening and surface modification technology of materials, liquid thermal spray technology has been used in many fields, such as wear and friction reduction, corrosion resistance, and high-temperature oxidation resistance. This article reviews the progress of liquid thermal sprayed coating in wear resistance as well as friction reduction in recent years. The influences of microstructure, composition, phase structure and mechanical properties on the tribological properties of typical coatings (including ceramic coatings and multiphase composite coatings) are investigated. The tribological properties of the coating are determined by the coating characteristics (including microstructure, porosity, mechanical properties, etc.) and the service conditions (working temperature, lubrication state, etc.). Typical ceramic wear-resistant coatings include Al₂O₃, YSZ, HA coatings, etc. The tribological properties of the coating can be significantly improved through process optimization and heat treatment. The comparison of nanostructured and microstructured ceramic-based coating reveals that nanostructured coating reduces wear by absorbing stress. The interaction between different constituent phases improves wear resistance and reduces wear in composite coatings. Finally, various challenges faced by liquid thermal spray are pointed out, and future research focuses are proposed.     

热喷涂设备的发展

热喷涂技术作为一种重要的表面处理技术,近年来发展很快.本文综述了热喷涂设备(包括等离子喷涂、高速火焰喷涂、爆炸喷涂等)近年来的发展情况.     

一种加热搅拌喷枪内涂料的新装置

涂料的成分复杂，容易产生沉淀分层而影响喷涂的质量。介绍了一种能加热和搅拌喷抢内涂料的新装置的结构和电路原理，该装置能明显提高喷涂的质量。阐述了使用该装置的操作步骤和注意事项。     

高速电弧喷涂LX88A涂层的抗磨粒磨损性能

采用高速电弧喷涂工艺在Q235钢上制备了LX88A涂层。用X射线衍射研究了涂层的相组成,用扫描电子显微镜对涂层的显微结构和磨损后的形貌进行了分析,测试了涂层截面的结合强度和显微硬度,在MLS-225型湿砂橡胶轮式磨粒磨损试验机上研究了涂层的抗磨粒磨损性能。结果表明,LX88A涂层的显微硬度平均值为1123.3HV(测试力0.98N),其组织是在铁基体上弥散分布着一定量的Al2O3、Fe2B、TiB2等硬质颗粒;相对于16Mn钢,LX88A涂层的抗磨粒磨损性提高了13倍。     

抗静电耐磨涂层的制备及性能研究

采用低黏度环氧树脂为胶粘剂,以石墨、硫酸钡、炭黑为填料,制备了抗静电耐磨涂层,考查了填料的含量及种类对涂层的磨耗性能、导电性能的影响。结果表明,石墨和硫酸钡具有良好的协同减磨作用,配合使用可以有效地减少磨损量,改善耐磨性;复合涂层的导电性能受到填料种类的影响,采用石墨-硫酸钡-炭黑填料的复合涂层具有更优的导电性能,该涂层可用于复合材料托辊的制造.     

Research progress on hafnium-based thermal barrier coatings materials

Thermal barrier coatings (TBC) are important materials applied to hot part components of aero-engines in order to improve their service temperature. Increasing inlet temperature is an important factor to achieve elevated thrust-to-weight ratio and high heat engine efficiency. In recent years, traditional TBC materials have gradually reached their operating limits due to the increase in turbine operating temperature. Hafnium-based materials become promising new candidates for TBC because of the similar structure, higher temperature phase stability and lower thermal conductivity compared to traditional zirconium-based materials. In this review, recent progresses in the research and development for hafnium-based TBC materials are summarized. The phase stability, thermal and mechanical properties of rare-earth (RE)-doped HfO₂ and RE hafnate materials are introduced. RE-doped HfO₂ has good thermal properties and phase stability at high temperatures whereas relatively low fracture toughness. The RE hafnates possess the advantages of a higher phase transition temperature, lower thermal conductivity and superior fracture toughness than RE zirconates. However, the thermal expansion coefficients of most RE hafnates are quite different from the alloy matrix. Finally, further research directions for hafnium-based TBC materials are prospected in this study.     

Effect of scandia content on the thermal shock behavior of SYSZ thermal sprayed barrier coatings

Nanostructured 4SYSZ (scandia (3.5 mol%) yttria (0.5 mol%) stabilized zirconia) and 5.5 SYSZ (5 mol% scandia and 0.5 mol% yttria) thermal barrier coatings (TBCs) were deposited on nickel-based superalloy using NiCrAlY as the bond coat by plasma spraying process. The thermal shock response of both as-sprayed TBCs was investigated at 1000 °C. Experimental results indicated that the nanostructured 5.5SYSZ TBCs have better thermal shock performance in contrast to 4SYSZ TBCs due to their higher tetragonal phase content and higher fracture toughness of this coating     

耐磨阴极电泳涂料的研究

利用专用水性阳离子颜料分散树脂,选择环保型颜料、助剂和耐磨填料,设计出耐磨阴极电泳涂料的色漆配方和分散工艺.采用PTFE乳液对传统乳液进行改性,当PTFE乳液用量为30%时,获得了具有优异耐磨性能的阴极电泳涂料.     

Sintering behavior of columnar thermal barrier coatings deposited by axial suspension plasma spraying (SPS)

During the last decade, Suspension Plasma Spraying (SPS) attracted a lot of interest as an alternative process to produce columnar Thermal Barrier Coatings (TBCs). In this study, columnar TBCs were deposited with SPS. After spraying, samples were isothermally annealed at 1373 K for 1 h, 3 h, 10 h and 50 h, respectively. Microstructures and mechanical properties of the ceramic coatings were investigated as a function of annealing time. Annealing resulted in healing of micro-cracks, coarsening of pores, growth of domain size, companied with a decrease of porosity within columns. The change of coating microstructure led to change of mechanical properties. In addition, residual stress in SPS coatings was also investigated. Furthermore, as-sprayed coatings and pre-annealed coatings were subjected to burner rig tests. Short time pre-annealing allowed to enhance thermal cycling lifetime of such SPS coatings. The thermal cycling results were related to microstructure modifications of coatings.     

镁合金防腐工艺的研究进展

综述了微弧氧化、化学镀、涂层等镁合金防腐工艺的优缺点及最新研究进展,指出了未来的发展趋势。