双马来酰亚胺树脂分子结构与其耐热性关系探讨

在实验研究双马来酰亚胺系列树脂耐热稳定性的基础上，讨论了双马亚酰亚胺在热氧气中首先形成了正离子自由基，正离子自由基的稳定性直接影响树脂的耐热稳定性，建立起双马来酰亚胺分子结构与其耐热稳定性的关系，得到有意义的结论。     

国产新型塑材耐热聚乙烯填补了国内空白

由齐鲁石化研究院与塑料厂紧密配合，自主开发的新型塑料材料耐热聚乙烯（PE—RT），经国家化学建筑材料测试中心检测鉴定机构8780小时的等级认证，被判定为Ⅱ型耐热聚乙烯材料。其各项常规性能指标均达到了国外同类产品。耐热聚乙烯采用特殊的分子设计和聚合工艺合成，     

快速凝固耐热铝合金研究动态与前景EI

本文综述了近年来快速凝固耐热铝合金研究和发展状况，着重讨论了耐热铝合金组分选择原则、制备方法、组织结构及性能特征，并对其应用前景做了展望。     

不锈钢纤维增强耐热浇注料的应用

不锈钢纤维增强耐热浇注料使用寿命长，减少了设备停产维修所造成的损失，因而在冶金、建材等工业部门得到广泛的应用。不锈钢纤维增强耐热浇注料，是将2％～3％的不锈钢纤维掺入耐热浇注料，以提高浇注料的断裂韧度、荷重软化强度及热振稳定性等性能。特别适用在110～11OO℃的     

耐热疲劳性镀层的研究

经过对几种耐热劳性镀层对比试验，发现Ｃｏ－Ｗ镀层具有突出的耐热疲劳性，适合作模具表面镀层。开发出一种电流效率高的Ｃｏ－Ｗ电镀工艺，获得了Ｃｏ含量６３．５％、Ｗ含量３６．５％、与模具钢结合良好、耐热疲劳性好的镀层。并对镀层进行了微观分析。     

大体积耐热混凝土的应用与质量控制

综述了耐热混凝土的耐热机理,结合施工工艺论述了耐热混凝土的应用,并从多个角度论述了耐热混凝土施工的质量控制要点。     

耐热球墨可锻铸铁

耐热球墨可锻铸铁是一种新型的耐热铸铁，具体工艺是在中硅耐热球铁铁水中加入适量合金元素及变质剂，使之在铸态下得到白口组织，再经过石墨化退火而得到球团状石墨。该铸铁胶中硅耐热球铁有更为良好的常温力学性能及高温抗氧化性。尤其重要是的，因其凝固与结晶方式发生了质的改变，铸铁的缩松倾向得以明显改善。     

Sb合金化在耐热镁合金中的应用

概述了镁合金的耐热性能及合金化设计依据,介绍了Sb在耐热镁合金中的应用,探讨了Sb对镁合金耐热性能的影响作用,展望了耐热镁合金的发展方向,旨在为耐热镁合金的开发提供思路和依据.     

Sm在耐热镁合金中的作用及研究进展

介绍了稀土元素Sm在耐热镁合金中的作用,重点阐述了Sm改善镁合金力学性能的强化机理,综述了不同系列含Sm耐热镁合金的研究进展,对含Sm耐热镁合金的发展方向进行了展望,认为在控制生产成本的前提下,Sm合金化是耐热镁合金研究的一个重要发展方向,期望能为稀土耐热镁合金的研制和开发提供思路和依据。     

2,4,6-三溴苯基马来酰亚胺合成成功

．2，4，6一三澳苯基马来酸亚胺（三澳单马，Br。MI）是一种耐热、高效活性阻燃单体、耐热改性剂和添加剂，可与苯乙烯、ABS等共聚制造阻燃树脂，或对各种树脂和塑料进行阻燃、耐热改性；可作杀虫剂、杀菌剂和防污剂的组份；它又是制药和农业化学品的中间体；尤其在先进复合材料基体树脂中填加这种单体可兼得耐热、阻燃耐湿等多种有益性能，目前此品尚无国产。最近，湖北省化学研究所（武汉）与航天总公司七O三所（北京）合作，经过反复试验采用熔融催化法研制和制备成功这种产品，收率85％左右，填补了国内空白。此品为白色或微黄色结晶…     

快速凝固耐热铝合金的现状与进展

耐热铝合金由于具有低密度、低价格、良好的耐热和耐腐蚀性能,在航空、航天等工业领域得到了广泛应用.回顾了耐热铝合金的发展历程,重点阐述了耐热铝合金的组分选择原则、制备方法及强化机制.分析了其目前存在的问题,并对今后的发展动向进行了展望.     

含铝耐热铸铁熔制新工艺的可行性探讨

本文初步探讨了含铝耐热铸铁熔制新工艺的可行性。试验结果表明,应用本文介绍的工艺方法可以使铝的烧损率稳定在8%～9%之间,铸铁无铝的偏析缺陷。此外,可以获得合格的化学成分以及较为满意的显微组织和机械性能。     

Radiative and conductive heat transmission through superinsulations — experimental results for aluminium coated plastic foils

The basic equations for the different heat transfer mechanisms in superinsulation packages and their inter-relationships are discussed. The distribution of the heat flow into the radiative and the conductive components leads to a calculated value for the lowest temperature at which a superinsulation can effectively be used. For six different aluminium coated foils the radiative and the conductive heat flow is measured as a function of the layer density and of the thickness of the aluminium coating. Additionally the outgassing of the foils and the electrical resistance of the aluminium layers dependent on their thickness is investigated.     

超高强铝合金RRA热处理工艺的研究进展

7000系超高强铝合金是航空航天工业的主要结构材料之一,T6(峰时效)状态下该系合金强度最高但对应力腐蚀(SCC)十分敏感,RRA(回归再时效)工艺兼顾了合金的强度和抗应力腐蚀性能,适应目前航空航天工业对结构材料的要求.综述了过去30年超高强铝合金RRA热处理工艺的发展和最新研究动态,并较全面地介绍了RRA热处理对超高强铝合金组织与性能的影响.     

一种双马来酰亚胺耐高温胶粘剂的研制

研制了一种双马来酰亚胺胶粘剂, 固化温度低于300℃, 可按传统工艺固化, 具有良好的耐热性, 400℃有2.0M Pa 以上剪切强度, 可用于铝合金或复合材料的粘接, 或作为复合材料基体树脂用于航空航天工业, 以满足其耐热性的要求, 保证航空航天器安全可靠地工作。      

Preparation and properties of cast aluminium alloy-granite particle composites

With a view to develop light weight, low cost and abrasion resistant material cast aluminium alloy composites dispersed with granite particles were prepared and their properties were evaluated. Natural mineral granite was crushed and treated prior to its incorporation in the aluminium alloy. Liquid metallurgy techniques was used to prepare composites involving the following steps: melting of aluminium alloy in graphite crucible, stirring of the melt, addition of granite particles and reactive metal in the melt and pouring the composite melt into permanent moulds. Physical, mechanical, tribological and metallographic properties of composites were studied. It was observed that there was reasonably uniform dispersion of granite particles in the matrix. Hardness and tribological (abrasive wear) properties of the base alloy improved considerably due to addition of the granite particles into it. This clearly indicates that these cast aluminium alloy based composites can be used as wear resistant materials.     

Interfacial reactivity of aluminium/fibre systems during heat treatments

The interfacial reactivity of specimens composed of aluminium coated on SiC-based fibres, carbon fibres and protected carbon fibres, was investigated. The woven fibres were coated with aluminium by physical vapour deposition and the obtained materials were heat treated in a furnace which was connected to a mass spectrometer. It was shown that reactions occur between CO and CO₂ gases, which are released by the fibres, and aluminium, when the temperature is above 650°C. These gases react during their passage through the aluminium layer and form aluminium carbide. Aluminium carbide is also produced by reactions between the solid-species constituents of the fibres and the metal. The amount of aluminium carbide formed at the fibre/metal interface during heat treatment was determined by hydrolysis. It was thus possible to ascertain that the aluminium carbide is mainly formed by the latter reactions. The efficiency of various protective coatings against the formation of aluminium carbide was also investigated.     

喷射沉积多孔材料的轧制变形理论

根据"表观总应变能达到一个临界值时材料开始屈服"这一概念,研究和建立了多孔材料轧制塑性变形屈服准则,根据"多孔材料变形时质量不变"原理建立了轧制变形过程中高向变形与相对密度、高向变形与纵向变形、泊松比与相对密度的关系.理论预测与用喷射沉积制备的FVS0812耐热铝合金多孔材料的轧制结果符合得较好;建立了多孔材料轧制变形相对密度与高向应力的关系,提高多孔材料所处的压应力状态可以加速材料的致密化速度,改善多孔材料的轧制成形性能.     

磷酸铝-聚醚砜层状复合材料的隔热及介电性能

采用高温煅烧成型工艺在聚醚砜(PES)基体表面复合了AlPO4耐热层,制备得到了AlPO4-PES层状复合材料。利用SEM、激光共聚焦显微镜三维形貌分析(CLSM-3D)、FTIR和TGA等分析技术对AlPO4-PES微观结构、化学成分以及热稳定性进行了表征。研究了AlPO4含量对AlPO4-PES层状复合材料的热导率和介电性能的影响。结果表明:AlPO4层显著地改变了PES基体的微观结构,二者之间通过物理方式紧密结合;随着AlPO4含量的增加,AlPO4-PES层状复合材料的热稳定性明显增强,而热导率却不断降低;AlPO4-PES层状复合材料的介电常数和介电损耗均随着AlPO4含量的增加而减小,并且在0.1~5MHz测试范围内表现出良好的频率稳定性。     

Titanium diboride particle-reinforced aluminium with high wear resistance

A TiB₂ particle (61 vol%, 4 m mean size) reinforced aluminium fabricated by liquid-aluminium infiltration was subjected to unlubricated rolling wear and was found from the weight loss to be 1.5 times more wear resistant than 17-4 ph stainless steel, twice as wear resistant as 1020 steel, 7.5 times more wear resistant than 2024 aluminium, and 12.8 times more wear resistant than the aluminium matrix. This wear resistance is attributed to the lack of particle pull-out and the ability of the TiB₂ particles to protect the softer underlying matrix from abrasion. This composite was approximately three times more wear resistant than AlN particle (50 vol%)-reinforced aluminium. The greater wear resistance of Al/TiB₂ compared to Al/AlN is due to the slow wear of the TiB₂ particles and the AlN particle pull-out. A slight decline in tensile strength and no effect on the modulus was observed in Al/TiB₂ after heating at 300 or 600°C for 240 h. This high-temperature stability is attributed to the lack of reactivity between TiB₂ and the aluminium matrix.