共查询到20条相似文献,搜索用时 31 毫秒
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I. W. Donald P. M. Mallinson B. L. Metcalfe L. A. Gerrard J. A. Fernie 《Journal of Materials Science》2011,46(7):1975-2000
There has, in recent years, been a major revival of interest in glass- and glass–ceramic-to-metal seals and coatings for new
applications. Experience dictates that many factors need to be taken into consideration in the successful design and manufacture
of high-quality seals, particularly if an adequate component lifetime is to be achieved. For example, during their preparation,
undesirable reactions may occur between diffusing metal species and glass constituents, and these can lead to the formation
of highly localized internal stresses, which can initiate failure of a seal either during manufacture or, more seriously,
whilst in service due to the influence of static fatigue. In the case of high-temperature systems, reactions under hostile
operating conditions also need to be taken into consideration. In this review, the factors learnt from past experience that
influence the formation and lifetime behaviour of glass and glass–ceramic/metal systems are briefly introduced, and their
relevance to the newer applications including solid oxide fuel cell sealants and coatings on titanium for biomedical applications
is discussed. 相似文献
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《Materials Science & Technology》2013,29(4):263-267
AbstractA process is described whereby polymer films are laminated using vacuum-deposited aluminium as an adhesive. Only modest pressures are needed to produce a pressure weld between the freshly deposited metal coatings. The influence of various process parameters on the metal–metal bonding is explored, with particular reference to surface contamination and deposition rate. In addition to their commercial potential, the laminates are particularly useful as test specimens for measuring metal–polymer adhesion.MST/178 相似文献
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炭/炭复合材料高温抗氧化涂层的研究进展 总被引:35,自引:12,他引:35
阐述了近年来国内外炭/炭复合材料高温抗氧化涂层在玻璃、贵金属、陶瓷以及复合涂层等涂层体系方面的新近展,总结了炭/炭复合材料高温抗氧化涂层在已有制备工艺的完善以及新工艺的开发等方面的最新研究成果,结合涂层炭/炭复合材料在航空、航天以及军事领域的应用背景对高温抗氧化涂层的下一步发展趋势进行了展望.指出:目前的研究结果尚达不到严酷环境下的应用要求,炭/炭复合材料高温抗氧化涂层下一阶段将向着长寿命、耐高温、抗冲刷和低成本的方向发展;涂层新工艺的开发和涂层与基体结合研究将是下一步的研究重点;多相复合涂层和梯度陶瓷涂层有望取得在高温冲刷环境下长时间应用的突破性进展. 相似文献
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TiN/Ti多层膜调制比对摩擦磨损行为影响的研究 总被引:3,自引:0,他引:3
考察了TiN/Ti多层膜调制比对其摩擦磨损行为的影响. 采用磁过滤阴极弧沉积的方法制备了具有不同调制比的TiN/Ti多层膜, 用扫描电镜和透射电镜对其层状结构及子层结构进行了观察和分析. 用纳米压痕和SRV摩擦磨损试验的方法, 对多层膜进行了纳米硬度和弹性模量测试以及摩擦磨损实验. 结果表明, 所制备的TiN/Ti多层膜层状结构清晰, 与基底结合良好, 调制比对多层膜的硬度和磨损特性影响较大, 而对摩擦系数的影响却不明显. 结合实验结果, 讨论了硬度与弹性模量的比值(H/E值)对TiN/Ti多层膜耐磨性的影响. 相似文献
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金属表面Sol-gel法制备耐腐蚀陶瓷涂层的研究进展 总被引:1,自引:0,他引:1
综述了溶胶-凝胶涂层的成膜原理,制备工艺,比较了溶胶-凝胶法与其它金属陶瓷涂层的制备工艺,讨论了溶胶-凝胶涂层对金属耐磨腐蚀性能,耐磨性能的改进及在腐蚀防护领域中的应用,还对溶胶-凝胶涂层技术的发展的提出了看法。 相似文献
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N. Grittner H. von Senden gen. Haverkamp Dipl.‐Ing. O. Stelling D. Bormann K. Schimanski M. Nikolaus A. von Hehl Fr.‐W. Bach H.‐W. Zoch 《Materialwissenschaft und Werkstofftechnik》2009,40(12):901-906
Rod Extrusion of Titanium‐Aluminum Composites The combination of different metals enables the processing of materials with local optimized properties. Thus, the production of metallic composites is associated with high standards in manufacturing technologie. Focus of the following investigations is the rod extrusion process of titanium‐aluminum‐composites. Besides the mechanical properties, the formation of the bonding zone and the mechanisms of adhesion in the bonding zone were investigated. The influence of specimens’ preparation and of different coatings used improve bonding were a matter of particular interest. Whereas coatings of copper or nickel inhibit the formation of a strong bonding due to the formation of oxide layers, sealed titanium cores can reach a mechanical strength of up to 100 MPa after rod extrusion. Compared to other joining technologies, an impairment of the base metal via formation of heat affected zones, pores or grain coarsening does not occur. 相似文献
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A limiting feature of the plasma spray process is the need for the powder to melt during its passage through the plasma flame. It is quite impossible to obtain coatings with materials that are difficult to melt. However, metal borides, particularly titanium boride, are attractive. Because of their high melting point, satisfactory coatings based on these materials have not been achieved.To overcome this problem, a process for making TiB2-Fe coatings was studied. The TiB2-based coatings were produced by the reaction of ferrotitanium with boron. The TiB2 formation was first studied by thermal differential analysis and X-ray diffraction. It was observed that TiB2 is formed at low temperature by an exothermic reaction. The characteristics of the reaction products obtained at different reaction temperatures are described.Agglomeration techniques were used to prepare the reagents: fine powders of ferrotitanium alloy and boron. TiB2-Fe coatings were produced by plasma spraying the agglomerated powders. The influence of the plasma spray process parameters and the powder preparation techniques on the coating microstructure is discussed.Thick hard coatings comprising compounds of the reagent materials are produced during spraying by this synergetic process. Such coatings may be suitable for wear resistance applications. 相似文献
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综述了氟树脂及聚苯硫醚涂料的性能和研究现状,重点介绍了FEP/PPS共混改性梯度涂层技术,分析了表面预处理工艺对该复合涂层的影响,并探讨了其发展趋势. 相似文献
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《Materials & Design》1987,8(1):41-45
The bonding process employs the principle of induction to produce rapid, reliable, positive seals on thermoplastics. Almost all thermoplastic materials are capable of being chemically joined to each other as long as the joining materials are compatible with each other in the melt state. A variety of dissimilar materials can also be welded by this process. Mechanical linkage of dissimilar materials can be accomplished via joint designs. Technical information is given about the process and several applications discussed. 相似文献
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用浸涂法制备了G/MoS2/Ekonol/PES/PPS多元复合涂层,以涂层结合强度为评价标准,采用混料回归实验优化设计了G/MoS2/Ekonol/PES/PPS复合涂层的涂料配方,用拉开法测定复合涂层的结合强度,并对结合表面进行了观察和分析,研究了涂料组成、涂层制备工艺参数和涂层厚度对涂层结合强度的影响。结果表明,用浸涂法能制得力学性能优良的G/MoS2/Ekonol/PES/PPS复合涂层;采用典型配方Ekonol:PES:PPS:G/MoS2:助剂=25:20:45:8:2(质量比)能够得到较大的结合强度。 相似文献
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To improve the quality of life, man has learned to manufacture countless chemicals, pharmaceutical and biotechnological products, petroleum fuels, and numerous metal products. The processing of these products and their by-products has had a major impact on the environment. Tougher air and water quality standards have led to the development of new sealing systems that far exceed performance requirements for emission control. New seal technology has resulted in non-contacting non-leaking seals for conventional pumps handling difficult services. Design and application of this seal technology is presented in this article. Comparison of competing technologies is discussed and life cycle costs are given. Clearly, gas lubricated non-contacting seals for pumps are becoming the choice of sealing technologies for plant operators on difficult services. These systems are proving to be very economical. 相似文献
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Electrically conductive interfaces between metal surfaces, including aluminum, are commonly formed by means of bonding with an electrically conductive adhesive. Humid environments induce an increase in electrical resistance between aluminum objects bonded in this manner. However, joints that are electrically stable through stress testing in environments of elevated temperature and humidity (85°C and 80% RH for up to 137.5 h) have been obtained by treating the aluminum surface with a thin layer (less than 50 Å) of an organo-silane coupling agent, that is, a material capable of bonding chemically with the aluminum oxide surface layer and potentially bonding with the polymer binder in the adhesive. The present study shows that besides their traditional use as surface modifiers for adhesion improvement, organo-silanes can act as corrosion inhibitors of aluminum surfaces to stabilize electrical performance. Whereas other treatments used for preparation of metal surfaces for bonding, using electrically-insulating structural adhesives, typically do not ensure reliable electrical performance, minimal and reproducible increase in resistance has been observed for joints prepared using the procedure described here. Application of this method does not require any significant investment in equipment and the surface pretreatment of the metal surface is quite simple. 相似文献
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Mangal Roy Vamsi Krishna Balla Susmita Bose Amit Bandyopadhyay 《Advanced Engineering Materials》2010,12(11):B637-B641
Over the years hydroxyapatite (HA) coatings have been used to improve biologic properties of Ti‐based load bearing metal implants. However, applicability of HA coated implants is subjected to physical stability of the HA phase and mechanical integrity of the coating‐substrate interface. In this study, we have compared the microstructure and in vitro cell–materials interactions of newly developed laser deposited Ta coatings and radio frequency (RF) induction plasma sprayed HA coatings on Ti substrate. In vitro biocompatibility study, using human osteoblast cell line hFOB, showed equally excellent cellular adherence and growth on Ta and HA coatings. Quantitative assay of cell survivability on these coatings showed that the Ta coatings provide comparable initial cell attachment to that of HA coatings. Microstructural analysis of the coatings showed strong metallurgical bonding without sharp interface between the Ta coating and the Ti substrate, while the interface between HA coating and the Ti substrate was sharp. The interface microstructural features and in vitro cell–materials interactions of Ta coatings on Ti clearly demonstrate their potential to replace HA based coatings for enhanced/early biologic fixation. Other significant benefits of these dense Ta coatings include high toughness, strong bonding with the substrate, and long‐term stability of the interface. 相似文献