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Metal matrix high temperature solid-lubricating composites

Time:2020-05-22 21:15:11  From:  Author:

 Metal matrix high temperature solid-lubricating composites are mainly consisting of Al matrix, Cu matrix, Fe matrix, Ni matrix, Co matrix solid-lubricating composites. In general, Al matrix and Cu matrix solid-lubricating composites are viable candidates for the employment below 400–500 °C, while the permissible temperature of Fe matrix solid-lubricating composites is at most 700 °C. Ni matrix and Co matrix solid-lubricating composites have high usable temperature, but not exceeding 900 °C for long term applications. Tribological properties of metal matrix high temperature solid-lubricating composites. Al alloys have been widely used for applications in automobile and aeronautic components owing to their light weight, high specific strength and good wear resistance. The tribological properties of Al alloys at room temperature have been extensively studied, while the research about their high temperature wear behavior is limited. Lately, the result indicates that Ale20Sie5Fee2Ni alloy has a favorable wearresistant performance from room temperature to 300 °C. Further researches show that the Al matrix composites with addition of Cucoated graphite can offer low friction and prevent severe adhesive wear at 500 °C, resulting from the combined effect of solid lubrication provided with graphite and dispersion strengthening by in-situ formed Al2Cu intermetallic. Cu alloys and composites are the candidate for solving oil-free lubrication problem below 400–500 °C, which have been widely used as sliding bearings and sleeves in many industries due to their good tribological properties as well as remarkable corrosion resistance and electric conduction. Soft metal with low melting point and graphite with layer structure usually work as solid lubricants for Cu matrix composites, such as CueSneZnePb-graphite composite, CueNieFeeSn-graphite composite.


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