A comparative study on the tribological behaviour of hexagonal boron nitride (h-BN) as lubricating micro-particles-An additive in porous sliding bearings for a car clutch
A comparative study on the tribological behaviour of hexagonal boron nitride (h-BN) as lubricating micro-particles-An additive in porous sliding bearings for a car clutch
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DOI：
10.1016/j.wear.2008.11.020
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发表时间：
2009-06-15
期刊：
影响因子：
5
通讯作者：
Oloyede, A.
中科院分区：
文献类型：
--
作者：
Pawlak, Z.;Kaldonski, T.;Oloyede, A.
本文以六方氮化硼(h-BN)为添加剂，对自润滑多孔质滑动轴承进行了实验研究。测量了(h-BN+油)润滑的粉末基复合材料在1.0 5~2.0 Mpa、滑动速度为1.35 m/S和2.5m/min时的摩擦因数，并对摩擦因数、轴承温度和承载能力等性能特征进行了讨论。H-BN添加剂的微粒直径在1~2微米之间。研究了压力-速度(PV)参数对浸渍润滑剂的多孔衬套复合材料的咬合转变时间的影响。研究发现，与纯润滑油润滑的自润滑轴承相比，加入微粒后，轴承的摩擦系数降低了一倍左右。与Mobil DTE-BB润滑剂相比，(h-BN微粒+油)的主要作用是h-BN微粒的浸渍持续时间较长，微粒逐渐释放，供给接触表面。对于制造应用，多孔轴承被组装在汽车离合器中。(C)2009爱思唯尔B.V.保留所有权利。
The present paper is based on experimental studies of self-lubricated porous sliding bearings with hexagonal boron nitride (h-BN) as an additive. The friction coefficients of powder matrix lubricated by (h-BN + oil) were measured at varying loads of 1.05-2.0 MPa and sliding speeds of 1.35 and 2.5 m/s. The results are discussed in the form of performance characteristics such as the coefficient of friction, bearing temperature, and load-carrying capacity. The micro-particles of the h-BN additive were between 1 and 2 mu m in diameter. The effect of the PV (pressure-velocity) parameter on the transition time to seizure for porous bush composites impregnated by the lubricant has been studied. It was found that the addition of the micro-particles to the oil decreased the friction coefficient about twice as compared to self-lubricated bearings lubricated only by oil.The main effect of (h-BN micro-particles + oil) in comparison to Mobil DTE-BB lubricant appears to be that the impregnation of h-BN micro-particles persists for a long period of time and the micro-particles are gradually released, being supplied to the contact surfaces. For a manufacturing application, the porous bearings were assembled in a car clutch. (C) 2009 Elsevier B.V. All rights reserved.