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本文研究了一种在地面使用寿命长,高空磨损值小,适用于低电压高电流密度,高低温高速度,负荷变换大的航空用软质电刷。通过采用润滑性高,结晶度高的高温石墨化处理的精炼石墨粉及导电性导热性好的软金属银粉及真空中、高空中润滑性好的MoS_2固体润滑剂而制备的高空和地面润滑性最好的软质石墨化电刷。为了使软质的电刷具有耐磨性,在电刷中加了灰分—碳以外的物质或叫杂质如SiC、SiO_2、Fe_2O_3等作为磨料(研磨剂)来提高电刷的耐磨性。试验结果显示:在石墨粉一阶段料中加入占石墨粉重量比的0.3%~0.8%的细粒SiC可最佳的降低电刷的磨损值,提高电刷的使用寿命,增强了电刷使用的可靠性。在石墨粉一阶段料中加入4种颗较粗的按不同比列组合的占石墨粉重量的1.2%、1.0%、0.8%、SiO_2、SiOxx、Fe_2O_3等破坏了润滑膜的动平衡,地面磨损值增大,高空试验磨损增大,甚至“粉尘化”磨损。
This paper studies a kind of aviation soft brush which has long service life on the ground and low wear value at high altitude. It is suitable for low voltage high current density, high temperature, high temperature and high load, and large load change. Through the use of high lubricity, high crystallinity of high-temperature graphitization of graphite and refined graphite powder and conductive good thermal conductivity of soft metal silver and vacuum, high airborne good MoS_2 solid lubricant prepared by the high altitude and ground lubricity The best soft graphite brush. In order to make the soft brushes wear-resistant, the brush is added with ash or carbon other than impurities or impurities such as SiC, SiO_2, Fe_2O_3 as abrasives (abrasives) to improve the wear resistance of the brush. The test results show that the addition of fine-grained SiC, which accounts for 0.3% ~ 0.8% by weight of the graphite powder, can reduce the wear value of the brush, increase the service life of the brush and enhance the use of the brush The reliability. In the first stage of the graphite powder, 4 kinds of coarse aggregates of different proportions were added to 1.2%, 1.0%, 0.8% of the weight of the graphite powder, which destroyed the dynamic balance of the lubricating film and ground wear Increase the value of high-altitude test wear increased, or even “dust ” wear.