共查询到20条相似文献,搜索用时 109 毫秒
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《新技术新工艺》2020,(8)
为了提高镁粉(Mg)的稳定性,采用化学氧化的方法,以吡咯为单体,过硫酸铵为氧化剂,制备了聚吡咯包覆的聚吡咯/镁粉复合材料(PPy/Mg),利用透射电子显微镜(TEM)、傅里叶红外光谱(FTIR)对其表面形貌和化学成分进行了分析,并通过空气中的热重曲线对比了镁粉和聚吡咯/镁粉复合材料的抗氧化能力,通过极化曲线分析了PPy/Mg复合材料的腐蚀电位和腐蚀电流密度,通过交流阻抗图谱分析了PPy/Mg的阻抗特性。结果证明,通过化学氧化的方法,吡咯单体在镁粉颗粒表面发生聚合形成了聚吡咯包覆层,聚吡咯包覆能有效提高镁粉在空气中的热稳定性;聚吡咯包覆对镁粉的电化学腐蚀有一定抑制作用,腐蚀电位正移了70mV,腐蚀电流密度降低了30%。 相似文献
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以含氢硅油为改性剂,用机械化学法对SiO2粉体进行表面改性,通过测定接触角和TG、IR、TEM等手段表征改性效果,讨论了改性剂用量、改性时间、磨机转速、球料比等因素对改性效果的影响.结果表明:机械化学法可以将含氢硅油负载到SiO2表面,负载机制包括化学吸附和物理吸附;改性剂用量50%、改性时间3 h、磨机转速300 r·min-1、球料比20条件下改性后SiO2的时接触角可达150.58°,改性后的SiO2粉体颗粒呈现较好的分散性. 相似文献
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采用硝酸氧化改性和涂层复合改性法分别对碳纤维(CF)进行了表面处理,并制备了CF增强热塑性聚酰亚胺(TPI)复合材料;对CF的表面形貌进行了观察,研究了表面改性方法对复合材料摩擦磨损性能的影响,并利用扫描电子显微镜观察了磨损表面形貌。结果表明:硝酸氧化改性增大了CF的表面粗糙度,随处理时间的延长粗糙度增大;经涂层复合改性后,CF表面包覆了一层聚酰亚胺(PI),保护了CF并提高了其与基体界面的结合强度;经表面改性后的CF增强TPI复合材料的摩擦磨损性能均得到提高,以涂层复合改性的效果最好;硝酸氧化改性后的CF在摩擦过程中易断裂,复合材料的磨损形貌以磨粒磨损为主,而涂层复合改性后的CF断裂得到抑制,与基体结合更为牢固,磨损表面较为平整。 相似文献
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组装改性碳纤维增强聚醚醚酮复合材料的摩擦学性能 总被引:2,自引:0,他引:2
采用十八烷基磷酸酯对碳纤维表面进行组装改性,用红外光谱仪对改性前后的碳纤维进行表征,并测量其静态接触角;研究组装改性碳纤维增强PEEK复合材料的摩擦学性能。结果表明:纯十八烷基磷酸酯组装改性的碳纤维粉体接触角高达120°,展现强疏水性;干摩擦条件下,组装改性碳纤维增强复合材料磨损率表现出先降低后升高的趋势,碳纤维质量分数为10%时磨损率和摩擦因数均达到最低,并且纯十八烷基磷酸酯改性效果最好,改性后的复合材料磨损面光滑,耐磨性能明显提高。 相似文献
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纳米SiO2包覆硅灰石填充改性尼龙1010的摩擦学性能 总被引:2,自引:0,他引:2
以硅灰石和水玻璃为主要原料,用无机化学沉积法制备纳米SiO2包覆硅灰石复合颗粒;利用扫描电镜和X射线衍射分析对包覆效果进行表征。将复合颗粒填充到尼龙1010中,对此复合材料进行拉伸、硬度和摩擦磨损实验,并与分别用硬脂酸改性硅灰石、未处理硅灰石填充的尼龙复合材料进行对比。结果表明,将纳米颗粒包覆硅灰石填充到尼龙1010中,可获得较好的结合界面,提高了尼龙复合材料的拉伸强度和硬度,比硬脂酸改性和未经处理的硅灰石更有效地改善了尼龙的摩擦学性能。 相似文献
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The use of magnesium alloys in engineering applications is becoming increasingly important as a relatively low density allows savings in energy consumption and therefore reduction in air pollution. An associated reduction in inertia makes these alloys potential candidates for friction components, but they suffer from poor wear resistance. Laser surface alloying with appropriate powder mixture is an innovative technique to improve surface properties of metallic alloys. In this study, the effect of laser surface alloying using Al12%Si powder on wear resistance of a magnesium alloy ZE41 is investigated. Hardness and wear resistance of the alloy are significantly enhanced after treatment. 相似文献
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镁合金AZ91D的阻尼减振性能 总被引:8,自引:0,他引:8
为了解镁合金减振效果与频率、振幅等因素的关系,对AZ91D镁合金的实际减振行为有明确的把握,对镁合金AZ91D、变形镁合金AZ31、铝合金以及钢4种材料进行室温下的阻尼一频率测量,发现在相同振幅和频率下,镁合金AZ91D具有比铝合金、钢和变形镁合金高出3~5倍的阻尼性能,并在6 Hz左右出现阻尼峰。通过对镁合金与铝合金发动机箱盖在冲击脉冲载荷作用下的振动进行三阶模态分析,发现镁合金试件的阻尼比,除第三阶比铝合金试件稍微偏小外,其余各阶均高于铝合金试件。镁合金试样的第一阶模态阻尼比比铝合金试件高出17.6%,而第二阶模态阻尼比高出41.3%,另外镁合金试样的第一阶模态质量比铝合金试样高出45.O%,而第二阶模态质量高出15.3%,表明镁合金发动机箱盖在使用中镁合金的稳定性、抗冲击性能以及对冲击载荷的减幅等方面都具有良好的动力学表现。 相似文献
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N. Selvakumar 《摩擦学汇刊》2016,59(4):733-747
This investigation studies the dry sliding wear behavior of magnesium (Mg) matrix composites reinforced with titanium carbide (TiC) and molybdenum disulfide (MoS2) fabricated using a powder metallurgy technique. The effects of both TiC (0–10%) and MoS2 (0–10%) content on the tribological properties are investigated. Wear tests are carried on magnesium reinforced with TiC and MoS2 individually and together in different proportions, using a pin-on-disc apparatus under dry sliding condition. The experiments were made using a Taguchi L27 orthogonal array with five factors at three levels. The wear resistance of the developed composites improved significantly compared to that of the magnesium matrix due to the effect offered by both reinforcements. Analysis of variance was used to verify the significance of factors influencing wear. In addition, the worn surfaces of the wear-tested specimens were examined using a scanning electron microscope coupled with energy-dispersive spectroscopy. 相似文献
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本文考察了高碱性硼酸镁清净剂在溶剂精制油和加氢油中的性能,结果表明硼酸镁清净剂对碳酸镁清净剂更适用于加氢基础油中。 相似文献
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《Measurement》2014
In the last decades, light materials, such as magnesium, are increasing their use in a wide range of industrial applications. The growing use of magnesium encourages the study of its use under different production processes. In this sense, the present study shows an experimental investigation in intermittent turning of UNS M11917 magnesium alloy, analysing different machining conditions: cutting speed, depth of cut and feed rate, along with the use of dry machining and minimum quantity lubrication (MQL) system. To evaluate intermittent turning process, continuous bars and slotted bars were used. The process is evaluated taking as response variable the surface roughness. Full factorial experimental designs are used and their results are analysed using the Analysis of Variance (ANOVA). Main results of the statistical analysis include the identification of feed rate as the main significant factor for all the tests, explaining the most part of the variability analysed. By contrast, cutting speed and type of interruption were not found to be significant sources of variability when analysed in isolation. Moreover, more dispersion of surface roughness values, in terms of Ra, was identified when machining at low feed rates which can difficult its prediction. In addition, when analysing depth of cut, this factor and its interaction with feed rate are also found to be significant sources of variability for Ra. Finally, the influence of the environment used in the machining process is also studied, finding that the use of the MQL system can lead to slightly worse surface roughness (Ra) results at the higher feed rates tested. 相似文献
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