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目前,导静电涂料的导电介质多以碳系和金属氧化物为主,不能兼顾涂料的防腐蚀与导电性能,对以碳纳米管(CNTs)作为导电介质和以环氧改性有机硅树脂作为导静电涂料基体树脂的研究均较少.利用环氧树脂改性有机硅低聚物合成了改性树脂,采用红外光谱对产物进行了表征,研究了碳纳米管含量、酸化处理、固化剂、分散剂含量对由CNTs制备的导静电涂料涂膜的导静电性能的影响.结果表明:CNTs含量对提高涂膜导静电性能有影响,CNTs含量为2.0%时导静电性能很好;CNTs酸化处理后涂膜的导静电性能得到明显提高;固化剂聚酰胺650含量为30.0%时,涂膜固化性能和导静电性能最优;分散剂能很好地提高CNTs分散性能,十二烷基苯磺酸钠/改性树脂(质量比)和十八醇/改性树脂(质量比)均在2.0%时达到其最佳效果. 相似文献
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本文对结合有双偶氮颜料的双层结构光导器件的性能以及电荷传输材料对光电导性能的影响作了综合介绍,对其在静电照像方面的应用前景作了展示。 相似文献
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提出使用静电净化器来改善室内空气品质问题。简单介绍静电净化器的装置结构和作用机理。分析静电净化器的技术特点。对比传统纤维过滤器,分析指出静电净化器具有阻力小、作用范围广、运行费用低的优点,应用于洁净空调系统中具有良好的技术优势和经济优势。同时对静电净化器存在的问题进行了分析,建议在静电净化器前加设粗效过滤器、在静电过滤器后加设活性炭纤维层来提高净化效率和降低臭氧浓度。 相似文献
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The response of Kevlar/epoxy missile motorcase material to low-velocity hard-object impact has been investigated by conducting static indentation and drop-weight single-impact tests. The damage to the composite as a result of these tests was characterized by calculating the absorbed energy from experimental data and visually inspecting the cross-sections of damaged samples. Results indicate that although the principal features of damage due to static indentation are similar to those resulting from drop-weight impact, a larger fraction of the absorbed energy is dissipated under static conditions in plastic deformation. 相似文献
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S. Arezoo V. L. Tagarielli N. Petrinic J. M. Reed 《Journal of Materials Science》2011,46(21):6863-6870
The quasi-static mechanical response of polymethacrylimide (PMI) foams of density ranging from 50 to 200 kg m−3 is investigated in order to provide experimental data to inspire and validate numerical constitutive models for the response
of polymer foams. The macroscopic mechanical response is characterised by conducting quasi-static compression, tension, shear
and indentation experiments, whereas microscopic deformation mechanisms are identified by conducting in situ SEM observations
during static compression and tension tests; it is shown that foams of low density collapse by cell wall buckling while foams
of high density undergo plastic cell-wall bending. As a result, both the elastic and plastic macroscopic response of the foam
display a tension/compression asymmetry. 相似文献
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3Cr2Mo塑料模具钢连续冷却相变行为 总被引:4,自引:1,他引:3
为了调节塑料模具钢3Cr2Mo的组织,以实现在线预硬化,使用Gleeble1500热模拟试验机、光学显微镜以及透射电子显微镜等研究3Cr2Mo钢变形及未变形奥氏体的连续冷却相变行为及相变组织.实验结果表明,3Cr2Mo钢奥氏体稳定性较高,在所研究的实验条件下,连续冷却过程中没有出现先共析铁素体和珠光体,而是发生贝氏体和马氏体相变.热变形使奥氏体发生了机械稳定化,贝氏体相变推迟到较低温度下才完成.随着冷却速度的降低,贝氏体的形态由常规板条状变成粒状,最终可获得粒状贝氏体组织. 相似文献
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Results of experimental studies on the influence of different thermal loading conditions on the resistance of a 15Kh11MFBl structural steel to long-term static and cyclic thermal loading are presented as applied to operating conditions of mineral-processing equipment. It was experimentally established that upon thermal loading of the material, two damage accumulation processes took place: quasistatic associated with directed plastic deformation and fatigue connected with alternating plastic deformation. The effect of overheating on the fracture pattern and resistance to long-term static and cyclic thermal loading was thoroughly investigated. Threshold values of the parameter determining the change of prevailing damage accumulation processes for this steel are shown to be in good agreement with similar values of this parameter for other steels. The results of investigations demonstrate that stresses used as a life criterion describe the lifetime of steel under thermal loading satisfactorily, irrespective of the prevailing damage accumulation process. 相似文献
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Freddy Armando Franco Grijalba Linilson Rodrigues Padovese 《Journal of Nondestructive Evaluation》2018,37(2):26
This paper reports the use of a non-destructive scanning technique to identify plastic deformation defects generated in steel. The technique is based on measurement of continuous magnetic Barkhausen noise (CMBN). In the experiments described here, surfaces with plastic deformations produced by crushing stresses in a 1070 steel are scanned, and the influence of probe configuration, coil type, scanner speed, applied magnetic field and the frequency band used for the analysis on the effectiveness of the technique is studied. A moving smoothing window based on a second order statistical moment is used to analyze the time signal. The results show that the method can detect the position of plastic deformation defects and distinguish between their amplitudes. 相似文献
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We study the joint effect of hydrogenation and plastic predeformation of 40KhN steel of drill strings after heat treatment
on its crack resistance under static and cyclic loads. In the nonhydrogenated state, plastic predeformation of steel only
slightly decreases its short-term crack resistance and, owing to crack closure, significantly increases the crack-growth resistance
in the near-threshold region. Hydrogenation of the material sharply decreases the short-term crack resistance of steel and
intensifies the growth of fatigue cracks, especially in the middle-amplitude region of low-frequency loading. The joint action
of plastic predeformation and hydrogenation results in a maximal decrease in the static and cyclic crack resistance of the
steel under investigation. We also analyze possible consequences of such an effect from the viewpoint of the structural strength
of a drill string.
Ivano-Frankivs'k State Technical University of Oil and Gas, Ivano-Frankivs'k; Karpenko Physicomechanical Institute, Ukrainian
Academy of Sciences, L'viv. Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 35, No. 5, pp. 67–70, September–October,
1999. 相似文献
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高压静电分选技术在回收废旧电路板中的研究进展 总被引:2,自引:0,他引:2
高压静电分选是利用物质的导电特性、介电常数差异,使静电力、重力、离心力等有效地作用在所有粒子上而实现分选,具有高效、低耗、环境友好等显著优点,是废旧电路板无害化处理和资源化利用的先进技术之一。分析了高压静电分选机的工作原理,结合对电场及空间电荷分布的研究和颗粒荷电及动力学过程研究的新进展,总结了应用于废旧电路板回收的高压电选机设备及工艺流程,并提出了该技术在废旧电路板回收再利用方面的一些新动向。 相似文献