Abstract
The erosion behavior was investigated of wear-resistant coatings of SiSiC and WWC applied to steel and graphite substrates using the controlled nucleation thermochemical deposition (CNTD) process, a refinement of the chemical vapor deposition (CVD) process. This process produces ultrafine equiaxed crystallites with average grain sizes of the order of tens to hundreds of ångströms. The room temperature erosion behavior of these materials was determined and compared with that of other conventional ceramic and metallic composite wear-resistant materials. The effects of various erodents, impingement angles and post-deposition heat treatments were investigated. The CNTD process produces materials with greater erosion resistance than that of conventional CVD materials and can be modified to deposit coatings onto ferrous alloys at low deposition temperatures. The erosion mechanism for CNTD materials is of the brittle type where the erosion rate is determined by the rate of initiation and propagation of cracks. It was found that post-deposition heat treatment of the CNTD WWC deposited at low temperatures improved the material's erosion resistance.
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