Preparation of carbon brushes with thermosetting resin binder

来源期刊：中国有色金属学报(英文版)2007年第6期

论文作者：夏金童 胡忠良 陈振华 丁国芸

文章页码：1379 - 1384

Key words：carbon brushes; properties; cure process; thermosetting resin

Abstract: Carbon brushes with a resin binder were prepared according to an industrial process and the effects of the molding pressure, grains size and cure temperature on the properties of brush samples were discussed. The results show that the bulk density, bending strength and Rockwell hardness increase, while resistivity decreases with increasing molding pressure. Cure temperature has much more influence on the properties of brushes than molding pressure and grains size. Isothermal differential scanning calorimetry(DSC) was used to estimate the degree of cure of resin binder and a novel method of using the true density to measure the degree of cure of resin binder was presented and discussed briefly. Based on optimal process parameters carbon brushes were manufactured, durability tests for brushes were carried out on an alternate current motor and scanning electron microscope(SEM) was adopted to observe the morphology of worn surface of brushes. The results show that a luster oxide film can be formed on the surface of brushes and their service life reaches 380 h.

基金信息：the National Natural Science Foundation of China