粉末冶金法制备航空青铜含油自润滑轴承

Oil-Impregnated Self-Lubricating Aeronautic Bronze Bearings Prepared by Powder Metallurgy Method

分别以Sn含量均为10wt%的Cu、Sn金属混合粉和Cu-Sn合金粉为原料,采用粉末冶金法(PM)制备了航空青铜含油自润滑轴承。分析了不同原料制备轴承的微观结构和相组成,表征了烧结温度对轴承的径向压溃强度、维氏硬度(HV)和含油率的影响。结果表明:不同原料制备青铜含油自润滑轴承的径向压溃强度、维氏硬度和含油率与烧结温度有密切关系。在780℃以下的烧结,以Cu、Sn金属混合粉为原料制备的轴承与以青铜合金粉为原料制备的轴承相比,前者的孔结构更为均匀,而且具有更好的综合性能。

Oil-impregnated self-lubricating bronze bearings were prepared by power metallurgy （PM） method with the mixed powder of 90wt% Cu and 10wt% Sn, and the bronze powder with 10wt% Sn content respectively. The microstructure and phase of the prepared bearings were investigated. The effects of sintering temperature on the Vickers micro hardness （HV）, radical crushing strength and oil content of the bearings were studied as well. It can be found that HV, radical crushing strength and oil content of the bearings have close connection with the sintering temperature. Better pore structure and combined properties can be obtained for the bearings prepared with the mixed powder compared with the bronze powder under the sintering temerature 〈780℃.