聚醚砜酮复合材料摩擦性能的研究

以杂环取代聚聚醚砜酮（ＰＰＥＳＫ）为基体,研究了石墨、二硫化钼（ＭｏＳ２）等无机填料,以及聚四氟乙烯（ＰＴＦＥ）对复合材料力学性能和摩擦性能的影响。结果表明,填充石墨和ＭｏＳ２后,可民时改善复合材料的弯曲强度和摩擦性能,两者具有协同作用,加入ＰＴＦＥ后可大幅度降低复合材料的摩擦系数及弯曲强度。     

高能电子辐照对酚酞聚芳醚酮摩擦磨损性能的影响

用MM-200型摩擦磨损试验机考察了辐照对酚酞聚芳醚酮(PAEK-C)摩擦磨损性能的影响。结果表明辐照可改善PAEK-C的摩擦磨损性能。当辐照剂量从5×10~4Gy升到1×10~7Gy时,PAEK-C的摩擦系数和磨损率均降低。红外光谱与XPS分析表明,PAETK-C样品在辐照后无明显的变化。电镜分析表明,未辐照样品的磨屑大于辐照后样品的磨屑,未辐照样品的磨损表面犁沟较明显,而辐照后样品的磨损表面无犁沟槽,且表面比较光滑。     

聚芳醚／纳米膨胀石墨／碳纤维高强导电复合材料及其制备方法

聚芳醚／纳米膨胀石墨／碳纤维高强导电复合材料及其制备方法,该复合材料由主基体聚芳醚、增强体碳纤维和膨胀倍数100倍以上的膨胀石墨组成,各组分的质量份为：主基体聚芳醚100份、增强体碳纤维1～30份、膨胀石墨1～8份。     

聚芳醚／纳米膨胀石墨／碳纤维高强导电复合材料及其制备方法

聚芳醚／纳米膨胀石墨／碳纤维高强导电复合材料及其制备方法,该复合材料由主基体聚芳醚、增强体碳纤维和膨胀倍数100倍以上的膨胀石墨组成,各组分的质量份为：主基体聚芳醚100份、增强体碳纤维1～30份、膨胀石墨1～8份。     

热塑性树脂增韧5405双马来酰亚胺树脂

为进一步提高５４０５双马来酰亚胺树脂的韧性，采用刚性热塑性树脂聚醚砜、酚酞聚芳醚砜、酚酞聚芳酮和端羟基酚酞聚芳醚酮作为增韧剂分别与其共混改性。结果表明，加入少量热塑性树脂进一步提高５４０５双马来酰亚胺树脂的韧性，同时不降低其耐热性，其中以低分子质量ＰＥＳ增韧效果最显著。     

固体润滑剂对丁腈橡胶复合材料性能的影响

将石墨、石墨烯以及两种不同尺寸的二硫化钼分别引入丁腈橡胶复合材料,考察四种固体润滑剂对复合材料性能,尤其是摩擦学性能的影响.结果表明,石墨烯的引入使丁腈橡胶复合材料的硬度及模量明显上升,扯断伸长率下降;而二硫化钼的引入有利于提高材料的撕裂性能.在干摩擦条件下,石墨烯的引入可有效提高材料的耐磨性并降低材料的摩擦系数,这得...     

PEK-CN/BN导热复合材料的制备与性能

以酚酞型聚芳醚腈酮(PEK-CN)为基体、六方氮化硼(BN)为导热填料,通过高温模压法制备了PEK-CN/BN导热复合材料,研究了BN含量对PEK-CN/BN复合材料导热性能、热稳定性、微观形貌与力学性能的影响.结果表明:BN能有效改善PEK-CN/BN复合材料的导热性能,复合材料的玻璃化转变温度与导热系数均随BN含量...     

芳香聚酰胺基摩擦材料的研制及应用

采用氯化亚铜、石墨和碳纤维研制了高摩擦系数、低磨损的芳香聚酰胺基摩擦材料,研究了材料的摩擦磨损性能和弯曲强度,结果表明,在芳香聚酰胺中加入氯化亚铜可明显提高材料的磨损性能,磨损体积由纯芳香聚酰胺的１６１×１０－８ｍｍ３降低到１３８×１０－８ｍｍ３,加入石墨和碳纤维不仅降低磨损性,而且还使磨擦系数降低。加入添加剂对弯曲性能影响不大。介绍了该材料在超声马达上的应用结果     

PEK-C增韧环氧树脂的研究Ⅱ

采用酚酞基聚芳醚酮为增韧剂改性环氧树脂,以芳香胺为固化剂,制备出一种改性环氧树脂。研究了改性树脂的耐热性和微观结构。实验结果表明:随着酚酞基聚芳醚酮用量的增加,改性树脂的玻璃化转变温度先增高后降低,当酚酞基聚芳醚酮用量为15phr时,改性树脂的玻璃化转变温度最高,达到193℃。同时,改性树脂的微观结构随着PEK-C用量增加而发生变化。由海岛结构先转变成双连续互锁结构,最终发生相反转。     

PEK-C增韧环氧树脂的研究Ⅰ

采用酚酞基聚芳醚酮为增韧剂,以芳香胺为固化剂,制备出一种改性环氧树脂。实验结果表明:当酚酞基聚芳醚酮用量为45phr时,改性环氧树脂综合性能最好。改性树脂的断裂韧性KIC最高,达到2.94MPa·m1/2,冲击强度达到了31.83k J/m2,均比增韧前提高了180%;拉伸强度达到了80.67MPa。同时,改性树脂的粘接力学性能得到较大提高,常温剪切强度和200℃剪切强度分别为31.27MPa和20.48MPa。     

Effect of radiation on the friction-wear properties of polyetherketone with a cardo group

We studied the effect of radiation on the friction-wear properties of polyetherketone with a cardo group (PEK-C) with a MM-200 model friction and wear tester. We found that radiation could improve the friction-wear properties of PEK-C to a certain degree. The friction coefficient and wear rate of PEK-C decreased as the radiation dose increased from 5 × 10⁴ to 1 × 10⁷ Gy. Scanning electron microscopy results revealed that the size of wear debris of unirradiated PEK-C was larger than that of irradiated PEK-C. The worn surface of unirradiated PEK-C showed plough marks, whereas the worn surface of irradiated PEK-C did not show plough marks; its surface was quite smooth. With the frictional couple of a carbon steel ring and an irradiated PEK-C block, a relatively uniform and coherent transfer film was formed on the ring surface. It was inferred that the transfer film contributed largely to the decreased friction coefficient and wear rate of the irradiated PEK-C. An IR spectrum showed that no significant chemical change took place when the PEK-C sample was irradiated. Thermal analysis results showed that radiation changed the thermal properties of PEK-C, therefore, its friction-wear properties changed at the same time. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 962–967, 2001     

Preparation of graphite composite bipolar plate for PEMFC

This research studied the preparation of graphite composite using liquid thermosetting plastic such as polyester resin (POE), phenolic modified alkyd resin (PhA) and mixed resin (POE with 10% PhA) as a binder. The morphology, physical, electrical and mechanical properties of the graphite composites were analyzed. The results showed that POE could combine with graphite powder (the 66% wt. saturated of graphite powder) better than PhA and mixed resin and gave higher electrical conductivity (4.52 S/cm). It was also found that epoxy resin could improve the mechanical property of composite plate. The addition of TiO₂ and ZnSt slightly decreased the electrical conductivity and the water absorption. Moreover, it was proposed that TiO₂ could improve the mechanical property. Carbon fiber can increase electrical and mechanical properties and water absorption of the composite with POE as a binder. The mixing of wet-lay mixture with graphite, carbon fiber and POE composite improved the mechanical property and decreased the water absorption.     

Synergistic effects of carbon fillers on tensile and flexural properties in liquid‐crystal polymer based resins

One emerging market for thermally and electrically conductive resins is bipolar plates for use in fuel cells. Adding carbon fillers to thermoplastic resins increases the composite thermal and electrical conductivity. These fillers have an effect on the composite tensile and flexural properties, which are also important for bipolar plates. In this study, various amounts of three different types of carbon (carbon black, synthetic graphite particles, and carbon fibers) were added to Vectra A950RX liquid‐crystal polymer. In addition, composites containing combinations of fillers were also investigated via a factorial design. The tensile and flexural properties of the resulting composites were then measured. The objective of this study was to determine the effects and interactions of each filler with respect to the tensile and flexural properties. The addition of carbon black caused the tensile and flexural properties to decrease. Adding synthetic graphite particles caused the tensile and flexural modulus to increase. The addition of carbon fiber caused the tensile and flexural modulus and ultimate flexural strength to increase. In many cases, combining two different fillers caused a statistically significant effect on composite tensile and flexural properties at the 95% confidence level. For example, when 40 wt % synthetic graphite particles and 4 wt % carbon black were combined, the composite ultimate tensile and flexural strength increased more than what would be expected from the individual additive effect of each single filler. It is possible that linkages were formed between the carbon black and synthetic graphite particles that resulted in improved ultimate tensile and flexural strength. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

不同混合导电掺和料水泥基复合材料压阻特性的实验研究

利用纳米石墨、炭黑等导电掺料制作的水泥基复合材料的压阻特性可进行交通违规监测.本文实验研究了由石墨、炭黑、碳纤维任意两导电掺料组成的复合导电相制作的高导电长方柱水泥基复合材料,在标准车载大小、不同荷载循环周期作用下的压阻特性.实验表明一定车载力作用下,所选配比情况,含石墨和碳纤维混合掺料的水泥基复合材料的压阻特性最好,含石墨和炭黑复合导电相的次之,含炭黑和碳纤维复合导电相压阻特性不明显.     

Influence of Ultra-Fine B4C and Nano-SiO2 on the Properties of Alumina-Graphite Refractories

The role of nano-SiO2 and ultra-fine boron carbide on the properties of alumina-graphite materials was investigated.The study showed that the ultra-fine boron carbide added modified the microstructure of residual carbon and promoted the chemical bond between residual carbon from phenolic resin and flake graphite.The carbon white could strengthen the residual carbon from phenolic resin.These two additives improved the mechanical properties of AG refractories at both room temperature and high temperature,and thermal shock resistance was improved noticeably.When the two additives were doped together,carbon white could retard the evaporation of B2O3.Thermal shock resistance was guaranteed with a smaller amount of ultrafine born carbide.     

Effects of the degree of graphitization and the presence of Fe, Ni, Al, and Si on the reaction stability of carbon materials to the action of CO2

With the use of industrial cokes, synthetic graphite, and graphite foams as an example, it was shown that the reactivity and, correspondingly, the thermal stability of carbon in a reaction with CO₂ can be regulated by increasing the fraction of graphite structures in the composition of a carbon material and by introducing the catalytic additives of 3d metals (iron and nickel) and also silicon or aluminum. The effect of the additives is explained by both a change in the degree of graphitization of the carbon material and the catalytic action on the course of reaction.     

金属铝结合镁-尖晶石-碳滑板的研制

研究了不同添加物(电熔刚玉、镁铝尖晶石、碳化硅和阿隆)对镁碳材料物理性能和抗热震性的影响,炭素种类对镁碳材料物理性能和抗氧化性的影响以及抗氧化剂种类和加入方式对镁碳材料常温抗折强度和抗氧化性的影响,根据确定的最佳添加物研制连铸钢包用滑板材料。结果表明:加入镁铝尖晶石有利于提高材料的抗热震性;与炭黑相比,添加597微细石墨可显著提高材料的常温抗折强度、致密度以及抗氧化性;以碳化硼和硅粉作为复合添加剂,有利于提高材料中、高温处理后的常温抗折强度,同时也提高了材料的抗氧化性;研制的镁-尖晶石-碳滑板材料在实际使用中的抗拉毛性优于重烧铝锆碳滑板,达到了钢厂的使用要求。     

石墨填充PMIA材料摩擦学性能研究

用MM—200型试验机在于摩擦条件下考察了石墨填充聚间苯二甲酰间苯二胺(PMIA)材料的摩擦学特性。结果表明,填充适量石墨能有效地改善PMIA的摩擦磨损性能,而填充2%的石墨可使PMIA材料的摩擦系数从0.38升高到0.42。电子探针微区分析和X光电子能量色散谱分析表明,在PMIA中填充适量石墨时对偶面上形成的连续的、富含碳元素的转移膜是提高摩擦磨损性能的主要原因;当PMIA中石墨含量较少时,不但没有上述效果,反而影响PMIA自身的转移,使材料的摩擦系数增大。     

Carbon materials for structural self-sensing,electromagnetic shielding and thermal interfacing

This paper reviews carbon materials for significant emerging applications that relate to structural self-sensing (a structural material sensing its own condition), electromagnetic interference shielding (blocking radio wave) and thermal interfacing (improving thermal contacts by using thermal interface materials). These applications pertain to electronics, lighting (light emitting diodes), communication, security, aircraft, spacecraft and civil infrastructure. High-performance and cost-effective materials in various forms of carbon have been developed for these applications. The forms of carbon materials include carbon fiber, carbon nanofiber, exfoliated graphite, carbon black and composite materials. Short carbon fiber cement-matrix composites and continuous carbon fiber polymer-matrix composites are particularly effective for structural self-sensing, with the attributes sensed including strain, stress, damage and temperature. Flexible graphite as a monolithic material and nickel-coated carbon nanofiber as a filler are particularly effective for electromagnetic shielding. Carbon black paste, graphite nanoplatelet paste and flexible graphite (filled with carbon black paste) are particularly effective for thermal interfacing; carbon nanotube arrays are less effective than these pastes. The associated science pertains to the relationship among processing, structure and properties in relation to the abovementioned applications. The criteria behind the design of materials for these applications and the mechanisms of the associated phenomena are also addressed.