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作为一种综合了铸造与粉末冶金优点制备近成形颗粒增强金属基复合材料的方法,喷射共沉积技术及其应用受到了广泛的关注。本文综述了喷射沉积颗粒增强金属基复合材料的发展现状;介绍了喷射共沉积技术的原理;讨论了喷射共沉积过程中金属液体对增强相的捕获机理和凝固前沿对颗粒的捕获问题;介绍了喷射沉积颗粒增强金属基复合材料的装置及工艺参数的控制;着重介绍了喷射沉积材料的组织性能及致密化工艺,提出通过旋球同步预致密后再分别进行往复镦-挤和等径角挤压实现沉积坯的大塑性变形达到完全致密与冶金结合;指出了喷射沉积金属基复合材料将向组织均匀化、韧性化、完全致密化方向发展。 相似文献
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金刚石颗粒增强金属基高导热复合材料的研究进展 总被引:2,自引:0,他引:2
随着我国电子技术的不断发展,对于电子封装材料的要求不断提高,作为新一代电子封装材料的金刚石颗粒增强金属基复合材料由于具备优异的热物理性能和良好的机械性能,受到了广泛的关注。就金刚石增强金属基复合材料的研究进程进行了总结,并列举了国内外研究者们在金刚石增强金属基复合材料方面所取得的进展。包括针对复合材料界面优化所采用的金属基体合金化、金刚石表面金属化以及先进制备技术的开发。并且总结了复合材料导热理论研究中所提出的理论和模型。最后,对于金刚石颗粒增强金属基高导热复合材料的进一步研究方向提出了展望。 相似文献
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本文综述了金属基混杂复合材料的研究进展。着重介绍了各种金属基混杂复合材料的发展背景、组成、工艺方法和性能特点,并对其发展前景作了分析,认为纤维与颗粒混杂增强的金属基复合材料和树脂基复合材料与铝合金的超混杂复合材料是最具活力的品种。 相似文献
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选区激光熔化是一种使用聚焦高能激光束熔化粉末,逐层叠加成形零件的增材制造方法.选区激光熔化可以直接制备复杂结构零件和实现近净成形,能够方便地通过粉末预混添加或原位反应实现颗粒增强金属基复合材料的控形控性,具有独特的技术优势,受到广泛关注.本文综述了选区激光熔化制备颗粒增强金属基复合材料的研究进展,总结了主要研究结果及存在的共性问题,并展望了选区激光熔化制备颗粒增强金属基复合材料的研究方向和发展趋势.通过总结分析,指出选区激光熔化制备颗粒增强金属基复合材料时,聚焦激光作用下形成的高温微小熔池凝固时间短,远远偏离平衡状态,凝固过程复杂,增强颗粒与基体间冶金反应剧烈,容易熔化、分解和溶解并对基体特性产生影响,进而影响成形后的复合材料的宏观形貌和组织、性能.除增强体成分、颗粒形貌与尺寸、体积分数外,复合材料的性能还受激光功率、扫描速度、扫描间距、粉层厚度、成形气氛等工艺参数的影响,粉末特性与工艺参数之间的交互作用复杂.因此,考察工艺参数与粉末特性之间的交互作用关系,系统研究增强体颗粒特性与成形工艺参数对复合材料宏观形貌、致密度、缺陷、组织和性能的影响规律,是实现复合材料组织结构设计和性能调控的基础. 相似文献
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系列环保型重防腐蚀涂料的开发 总被引:9,自引:1,他引:8
介绍了以改性环氧树脂为基料的无溶剂环保型功能涂料研制技术路线、主要技术性能、特性和施工工艺 ,并举例说明了它们在实际工程中的应用。 相似文献
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Xu Han Jianhua Wu Xianhui Zhang Junyou Shi Jiaxin Wei Yang Yang Bo Wu Yonghui Feng 《材料科学技术学报》2021,61(2):46-62
The advancement in material science and engineering technology has led to the development of antifouling(AF) coatings which are cheaper, durable, less toxic, and safe to the environment. The use of AF coatings containing tributyltin compounds was prohibited at the beginning of 2003, this necessitated the development of environmentally friendly coatings. The fouling release coating(FRC) lacks biocides and has low surface energy, low elastic modulus with smooth surface properties, hence a better release effect to fouling organisms. Several functional coatings have been recently developed based on fouling release(FR) technology to combat the effects of biofouling. Here, we provide a brief overview of innovative technologies and recent developments based on FRCs, including silicone, modified fluorinated polymer,cross-linked coatings, amphiphilic copolymer coating, hydrogel coatings, and biomimetic coatings. We also highlight the key issues and shortcomings of innovative technologies based on FRCs. This may give new insights into the future development of marine AF coatings. 相似文献
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K. Dünkel D. Meyer T. Lampke Prof. S. Steinhäuser 《Materialwissenschaft und Werkstofftechnik》2009,40(12):888-893
Electroless deposition of NiP nanocomposite coatings The electrolytic and electroless deposition of nickel‐based nanocomposites gains increasing interest in worldwide science. Due to the high specific surface of nanoscaled reinforcements, major properties are determined by surface properties. On the other hand, nanoscaled particles offer technological advantages in the production of very thin coatings, e.g. in microsystems technology. But in particular the process parameters in the deposition of electroless microscaled dispersion coatings are not transferable to nanoscaled ones. This article deals with the development and modification of processes for stable electroless deposition of nanoscaled NiP dispersion coatings and their effect on selected coating properties (hardness, photocatalytic activity). The objective to obtain homogeneous and non‐agglomerated incorporation of the particles has been achieved to a large extent. The effect of ultrasound on the incorporation and desagglomeration is discussed. 相似文献
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Chun SY 《Journal of nanoscience and nanotechnology》2011,11(8):7378-7381
Nano fabrication technology of superhard TiN films with sub-nanometered crystallites was developed using an Inductively coupled plasma (ICP) during deposition. Nanocrystalline TiN coatings were fabricated by ICP assisted sputtering and the properies of the coatings were investigated. The ICP assisted TiN coatings showed a much higher nano-hardness (>43 GPa) compared to coatings produced by the conventional DC sputtering process. The ICP assisited TiN coatings also showed superior properties in dense microstructure and surface roughness compared to the DC sputtered TiN coatings. The superior mechanical properties of ICP assistted TiN coatings were attributed to the fine and dense microstructure and high compressive residual stress. 相似文献
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鉴于手工电刷镀技术存在受操作人员的经验影响大、镀层质量不稳定、效率低且劳动强度大等缺点,研发了自动化纳米电刷镀技术及一台用于回转工件表面刷镀的样机,对比研究了手工和自动化电刷镀制备的镀层性能,针对连杆大头轴承座孔研制了再制造专机。结果表明,自动化纳米电刷镀技术可制备高质量镀层并显著提高生产效率。 相似文献