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The high temperature (25°C to 538°C) traction characteristics of graphite lubricants containing additives of silver, phosphate glass, and zinc orthophosphate were evaluated in a specially designed ball-on-disk traction device. Bearing quality balls of hot-pressed silicon nitride burnished with the graphite lubricant were loaded against lubricated disks of hot-pressed silicon nitride. Characteristic behavior of the measured tractions was similar in nature to that of liquid lubricants, however, traction force magnitudes were often much higher. Traction coefficients ranged from us low us 0.07 to as high as 0.66. Based on the data collected, an empirical solid lubricant traction model was constructed and applied to an advanced bearing analysis code. 相似文献
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采用柔性石墨、造粒石墨和鳞片石墨分别制备粉末冶金烧结摩擦材料,研究不同种类片状石墨对摩擦材料摩擦磨损性能的影响。结果表明:不同种类石墨制备的摩擦材料的密度和力学强度差异,将影响材料基体在制动过程中的组织形态,使摩擦界面呈现不同的磨损形式,其中柔性石墨摩擦材料的主要磨损机制为氧化磨损,造粒石墨摩擦材料的主要磨损机制为犁削磨损和磨粒磨损,鳞片石墨摩擦材料的主要磨损机制为犁削磨损和黏着磨损;造粒石墨制备的摩擦材料在不同速度下制动和重复单次制动时的摩擦因数波动值较小,摩擦因数稳定性好,且具有适中的磨耗量,综合摩擦磨损性能最佳。 相似文献
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为了深入了解冷激合金铸铁气门挺杆的磨损规律,研究了冷激合金铸铁气门挺杆表层组织对耐磨性的影响.结果表明:当气门挺杆组织中的石墨以点状均匀分布,碳化物呈细小针状、块状,分布较为均匀时,耐磨性较好,磨损形式以划伤、点蚀为主;当气门挺杆组织中的石墨以片状均匀分布,碳化物呈粗大针状、块状,分布不均匀时,耐磨性较差,磨损形式以剥落为主. 相似文献
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比较四种热处理方法下蠕墨铸铁试样的断裂韧度.试验结果表明,蠕墨铸铁的断裂韧度受不同基体组织的影响比较明显;受不同石墨形态的影响显著,与结构钢不同,蠕墨铸铁的断裂韧度随材料的屈服强度增大而增大,随石墨颗粒的长厚比增加会急剧下降. 相似文献
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采用液淬微分热分析法研究了片墨铸铁中片状石墨的形核过程。结果表明,片状石墨的初始形态为团球状,孕育剂的作用主要是增加石墨的异质形核能力。对片墨雏晶的检测分析说明:可作为片墨结晶的异质核心主要有锰的硫化物、硅的氧化物和钙的碳化物三类,其中复合硫化物是最为有效的异质晶核。并由此提出了设计较为理想的灰口铸铁用孕育剂的合理原则,根据这些原则研制的孕育剂经使用效果是理想的。 相似文献
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Alloyed gray cast iron of varying compositions was studied for their wear behavior. In general, the alloyed gray irons studied have higher graphite volume fraction (∼20%) with Type-A graphite flake morphology. Base cast iron showed two to three times higher wear rates than the alloyed gray irons. Tensile strength and wear rates show decreasing trend with increase in graphite and carbide volume fraction. Wear track analysis shows three body abrasive wear mode resulting in debris generation and smudging along the wear tracks. The graphite gets released during sliding to form films along the wear tracks and then forms irregular debris. 相似文献