Effect of fillers of resin-bonded composites on diamond retention and wearbehavior

A study was presented to investigate the action of fillers of the resin com posites in the diamond abrasive retention on the phenolic bond and wear beh aviors. The diamond composite specimens with copper, carbon black and silic on carbide fillers were prepared by compression molding. The wear behaviors of these fillers filled composites sliding against aluminum oxide sandpape r were studied under dry condition. The worn surfaces of the diamond compos ites were examined using scanning electron microscopy and stereo microscopy , respectively. Experimental results showed that when the phenolic resin wi th 30-40 vol% Cu filler is employed, the resulting worn surface after the w ear test occurs the relatively higher proportion of the retained diamond an d the smaller number of grit pulled-out, and the wear loss is relatively lo wer. Small number of carbon black filler added to the diamond composite wit h 20-30 vol.% Cu filler have a positive effect on the diamond retention and the wear loss. Silicon carbide filler added to the resin-bonded diamond co mposite containing Cu filler generally results in slightly higher wear. Wit h the increase of the sliding velocity, the proportion of the diamond parti cle retained on the worn working surface decreases and the proportion of ho le of diamond pulled-out increases. This produces a relatively higher wear loss of the diamond composites. (C) 1999 Elsevier Science S.A. All rights r eserved.