共查询到16条相似文献,搜索用时 46 毫秒
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为提高复合铝基润滑脂的综合性能,采用矿物油(KN4010)为基础油,以12-羟基硬脂酸、硬脂酸、苯甲酸、氢氧化锂、异丙醇铝为稠化剂原料,制备一系列复合铝-锂基润滑脂。通过对其滴点、锥入度、钢网分油与摩擦因数等重要参数的表征,研究基础油含量与铝锂比例对复合铝-锂基润滑脂性能的影响。结果表明:铝锂比例为3∶1时制备的复合铝-锂基润滑脂具有较高的滴点、极低的钢网分油量与较低的蒸发损失,同时摩擦因数与磨斑直径均明显低于复合铝基润滑脂。复合铝-锂基润滑脂中Al、Li元素可能在减磨过程中起到共同作用,从而使摩擦因数与磨斑直径均明显低于复合铝基润滑脂。 相似文献
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高频电压诱导的电机轴承电蚀和润滑失效是影响变频驱动系统可靠性的关键问题。为探究高频交变电场环境下润滑脂的老化机制,基于绝缘轴承耐高频交变电压性能试验,详细研究了球与沟道接触区润滑脂的老化特性,结果表明:尽管有绝缘涂层的保护,润滑脂在无机械剪切作用下仍然会发生明显的性能衰退,具体表现为颜色加深,分油率降低,稠度增大以及导电性能和介电性能的改变。测试发现,在高频交变电场作用下绝缘轴承润滑脂稠化剂结构被破坏并发生团聚,其中夹杂有以金属纳米颗粒为核心的黑色团块,老化润滑脂的直流体积电阻率明显下降并具有更高的等效串联电阻和损耗因子。 相似文献
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Thermodynamics has historically been used to derive characteristic material properties. In this study, fundamental thermodynamics is applied to grease. First-principle formulations of existing material properties—heat capacity and storage modulus—and new properties—thermal strain and stress coefficients, chemical resistance and thermo-chemical decay coefficient—are derived, some of which are experimentally determined. A new group of Maxwell relations is introduced by replacing the classical compression work with the grease shearing work . The physical interpretations and implications of these properties on grease behaviour and performance are presented. Experimental measurements of the derived properties are performed in accordance with the theoretical formulations. Six different grease types are studied. Obtained results are shown to conform with anticipated, observed and established grease behaviours. The proposed properties can be used in grease performance and degradation analyses, as well as grease selection for lubrication applications. 相似文献
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将α-C_(14)烯烃先与马来酸酐进行无规共聚,再与季戊四醇进行酯化反应,制得一种新型的聚α-C_(14)烯烃/酯类润滑基础油。采用红外光谱、核磁共振谱~1H-NMR、热重分析仪、油品运动黏度测定仪、酸值测定仪对产物进行表征和性能测试。结果表明:随着马来酸酐用量增加,合成的基础油的运动黏度、热分解温度、酸值均先增大后减小,随着季戊四醇用量增加,合成的基础油的运动黏度、热分解温度先增大后减小,酸值逐渐降低;当马来酸酐与α-C_(14)烯烃质量比为1∶5.14,季戊四醇占α-C_(14)烯烃质量4.17%时,润滑基础油的黏度指数为114,酸值为0.082 mg/g(以KOH计),热分解温度大于249.3℃,40℃运动黏度为276.31 mm~2/s,100℃运动黏度为25.91 mm~2/s。因此,与AIP类润滑油相比,合成的基础油具有更好的低温流动性和耐高温稳定性,与传统的酯类润滑油相比具有较低的酸值,对器件腐蚀性较低。 相似文献