金属基复合材料的发展与应用

介绍了金属基复合材料的研究及发展历程,以及国内外的研究进展情况,例举了一些不同制备工艺的金属基复合材料的力学性能和金属基复合材料在各方面的应用.     

先进复合材料从飞机转向汽车应用的关键技术

轻量化是汽车工业实现可持续发展的重要途径,先进复合材料（AdvancedCompositeMate．rials,ACM）特别是碳纤维增强聚合物基复合材料具有质轻高强的性能特点,是最为重要的轻壁化材料之一。ACM在航空工业已有四十年的技术和应用积累,但汽车工业的产业特点明显不同于航空,其中最突出的就是对成本和生产效率的要求更高。因此,将ACM的技术特点与汽车工业的重要需求相结合,本文首先介绍了碳纤维复合材料用于汽车结构的最新应用进展,列举了发达国家的相关研发计划。在此基础上,从复合材料设计制造一体化、低成本碳纤维、复合材料高效制造和材料循环利用等四个方面讨论了制约汽车用ACM规模化应用的关键技术。以期为研究发展适合我国汽车工业的复合材料高技术提供一点粗浅见解。     

国外新型轻质复合材料在火炮上的应用与发展

介绍国外新型轻质复合材料在炮管及火炮其它零部件上的应用研究与发展状况,并指出了火炮材料的发展趋势.     

金属层状复合材料的发展与应用

金属层状复合材料具有单一金属不具备的某些特殊性能,使它在国民经济各部门的应用越来越广泛。较全面地介绍了金属层状复合材料的结构特点、发展动态和主要加工方法,对典型复合材料及其应用领域进行了评述。     

Al2O3sf.SiCp／LY12复合材料液态下浸渗与塑性成形的研究

采用液态浸渗和渗后直接挤压的方法,成功地制备出Al2O3sf·SiCp／LY12非连续混杂增强金属基复合材料。其增强物分布均匀,基体组织致密,与基体LY12相比具有较高的弹性模量、屈服强度、抗拉强度,并且延伸率也保持较高的水平。同液态浸渗制备的复合材料相比,各项力学指标均有提高。     

金属基石墨复合材料的制备与应用

介绍了金属基石墨复合材料的性能特点、制造工艺,论述了该复合材料的应用。     

金属基石墨复合材料的制备与应用

介绍了金属基石墨复合材料的性能特点、制造工艺，论述了该复合材料的应用。     

贵金属复合材料的成就与展望:(Ⅲ)贵金属复合材料的性质、应用与展望

本文是作者发表的"贵金属复合材料的成就与展望"系列文章的第三部分,介绍了贵金属复合材料的综合性质、复合效应和主要应用,展望了贵金属复合材料的发展前景.     

贵金属复合材料的成就与展望:(III)贵金属复合材料的性质、应用与展望

本文是作者发表的“贵金属复合材料的成就与展望”系列文章的第三部分,介绍了贵金属复合材料的综合性质、复合效应和主要应用,展望了贵金属复合材料的发展前景。     

颗粒增强铝基复合材料的研究与应用

介绍了颗粒增强钒基复合材料的性能特点,铝基复合材料基体与增强体润湿性的研究现状.总结了铝基复合材料的应用情况以及国内外的研究现状.     

Non-destructive testing of barely visible impact damage in polymer matrix composites

Barely visible impact damage (BVID) is developed when polymer matrix composites are subjected to impact loading. The damage has an adverse effect on structural integrity, and potentially leads to catastrophic failure.Thus it is important to employ a variety of advanced non-destructive testing (NDT) techniques in parallel to unambiguously determine the integrity of composite systems. This study deals with damage evaluation using visual inspection, ultrasonic C-scan, electronic speckle pattern interferometry (ESPI), electronic shearography (ES) and optical deformation and strain measurement system (ODSMS). Internal damage was introduced using an instrumented falling weight impact test (IFWIT) machine by controlling the combination of striker mass and releasing height. It was found that different NDT techniques were successfully employed to identify and visualise the impact induced internal damage. Experimental results generated from these techniques show a good agreement in damage identification and determination. The features, capabilities and limitations associated with these techniques were briefly discussed.     

On the mechanics and material removal mechanisms of vibration-assisted cutting of unidirectional fibre-reinforced polymer composites

This paper aims to reveal the material removal mechanisms and the mechanics behind the vibration-assisted cutting (VAC) of unidirectional fibre reinforced polymer (FRP) composites. Through a comprehensive analysis by integrating the core factors of the VAC, including fibre orientation and deformation, fibre–matrix interface, tool–fibre contact and tool–workpiece contact, a reliable mechanics model was successfully developed for predicting the cutting forces of the process. Relevant experiments conducted showed that the model has captured the mechanics and the major deformation mechanisms in cutting FRP composites, and that the application of ultrasonic vibration in either the cutting or normal direction can significantly decrease cutting forces, minimise fibre deformation, facilitate favourable fibre fracture at the cutting interface, and largely improve the quality of a machined surface. When the vibrations are applied to both the cutting and normal directions, the elliptic vibration trajectory of the tool tip can bring about an optimal cutting process. There exists a critical depth of cut, beyond which the fibre–matrix debonding depth is no longer influenced by the vibration applied on the tool tip.     

镁合金表面可降解聚合物改性涂层研发及应用

相比于钛合金、不锈钢、钴基合金等传统生物医用金属材料,镁合金不仅具有生物可降解特性,而且其弹性模量与人体骨骼很接近,不容易产生“应力屏蔽”,被誉为“新一代先进生物材料”。但镁合金在人体降解速率过快,由此产生的力学失稳和过量降解产物在体内的代谢吸收隐患限制了其在外科植介入医疗领域的大量推广应用。而可生物降解或可吸收的天然和合成高分子(聚合物)是全球量大面广的一类质轻、多功效、生物安全性好的生物医用材料,若将其作为可降解镁合金表面的特种防护涂层并解决好两者表界面之间的生物功能性和力学相容性,将是开发先进镁合金材料及其应用的重要发展方向。本文综述了生物可降解的镁基合金表面天然及合成高分子涂层的最新研究进展,并对其未来的研发及应用发展趋势提出展望。     

树脂基复合材料拉挤成形工艺的应用与探讨

通过对树脂基复合材料拉挤成形工艺进行分析,确定最佳的工艺参数,从而达到提高产品质量与生产效率的目的。     

大功率、大采高电牵引采煤机的研制与应用

随着国家6 m以上厚煤层工作面的开采,国产大功率、大采高电牵引采煤机的研发成为煤炭行业亟待研究的课题。本文介绍了西安煤矿机械有限公司研制的MG900/2210-GWD型采煤机在陕北红柳林煤矿的生产情况,比较了国内外6 m以上煤层大功率采煤机的特点,对采煤机的结构和控制系统进行了改进,并提出了大功率采煤机的发展趋势和研究方向。     

碳酸钙晶须增强聚醚醚酮自润滑复合材料的动态力学行为

利用热压成型法制备碳酸钙(CaCO3)晶须和聚四氟乙烯(PTFE)填充的聚醚醚酮(PEEK)基自润滑复合材料.用动态热机械分析仪测试了复合材料的动态力学性能.得到了储能模量、耗能模量及损耗因子随温度变化(25～300℃)的曲线,并和纯PEEK进行比较,分析填充组分对PEEK动态力学性能的影响.结果表明:CaCO_3/PEEK复合材料在玻璃化转变温度(Tg)以下的储能模量比纯PEEK大幅度提高,且随着晶须含量增加而增加;在Tg温度以上,CaCO_3/PEEK复合材料储能模量相对纯PEEK仍保持较高的水平,显著提高了复合材料的高温刚性和热变形温度.加入PTFE使CaCO_3/PEEK复合材料在Tg温度以下的储能模量有所降低,但在Tg温度以上没有衰退.CaCO_3晶须和PTFE的协同作用有助于提高PEEK自润滑复合材料的摩擦学性能.     

Study on electrochemical surface modification of coal by FTIR and Raman spectra

1　ＩＮＴＲＯＤＵＣＴＩＯＮＨｉｇｈｓｕｌｆｕｒｃｏａｌｏｃｃｕｐｉｅｓａｌａｒｇｅ ｐａｒｔｏｆｔｈｅｗｈｏｌｅｄｅｐｏｓｉｔｏｆｃｏａｌｉｎｔｈｅＳｏｕｔｈ ＷｅｓｔａｎｄｔｈｅＥａｓｔｏｆＣｈｉｎａ .Ｗｉｔｈｏｕｔｗａｓｈｉｎｇａｎｄｄｅｓｕｌｆｕｒｉｚａｔｉｎｇ ,ｔｈｅｃｏｍｍｅｒｃｉａｌｃｏａｌｉｓｏｆｌｏｗｑｕａｌｉｔｙ ,ｌｏｗｃｏｍｂｕｓｔｉｏｎｅｆ ｆｉｃｉｅｎｃｙｗｉｔｈｌａｒｇｅｃｏａｌｗａｓｔｉｎｇ ,ｇａｓａｓｈ ,ＣＯ2 ａｎｄＮＯｘ .Ａｂｏｖｅａｌｌ,ｔｈｅｃｏｍｂｕｓｔｉｏｎ…     

Equation for the density of particle-reinforced metal matrix composites: A new approach

This paper presents a novel equation for the density of ceramic particle reinforced metal matrix composites. An overall density change occurs in composites due to the thermal mismatch between the metal matrix and the reinforcement. The thermal mismatch occurs because the coefficient of thermal expansion and the elastic properties are different for the matrix and the reinforcement. The values obtained using the proposed equation for density were compared with both the rule of mixtures for density and the experimental values obtained for aluminium and zinc alloy composites. The composite specimens were fabricated using compocasting technique (one of the types of liquid metallurgy route). The proposed mathematical model is found have better agreement with the experimental results at lower volume fractions of the reinforcement; however, some deviations were observed at higher volume fractions of the reinforcement. The proposed equation yields agreeable results for aluminium composites and fairly agreeable results for zinc alloy composites.     

罐式煅烧炉煤炭快速启动新技术开发及应用

罐式煅烧炉（简称炉）的使用寿命与炉的设计、筑炉质量、炉启动和正常生产工艺条件有关,兰州铝业股份有限公司的炉寿命达到11年,是把影响炉寿命的上述几个因素优化的结果。详细介绍炉煤炭快速启动新技术和采用该技术取得的可观的经济效益。因此,推广该技术具有良好的前景即具有良好的社会效益。