Solid-Particle Erosion of High-Technology Ceramics (Si

摘要: Four "engineering" ceramics were subjected to impact (single particle) and erosion (multiple impacts) under conditions which simulate a natural dust environment in the subsonic velocity regime. The target materials are hot-pressed silicon nitride (Si 3 N 4 ), reaction-bonded Si , glass-bonded aluminum oxide (Al 2 O magnesium fluoride (MgF ). Tests performed with six narrow size ranges of quartz between 10 385 μm average, five velocities for each particle size. Hot-pressed was also impacted carbide (SiC) same size-velocity conditions. results discussed terms current models by considering dependencies, appearance damage, basic properties structure targets. Under these conditions, four exhibited widely different behavior not only absolute amount material removed, but mechanism removal. systems -SiC particles MgF -quartz characterized highly deformed, permanent surface crater associated lateral radial crack formation, loss proportional mass velocity, both fourth power. Erosion third power first occurred minor chipping no secondary formation. Al did show consistent dependence. variation is related two-phase materials. It found that strength necessarily reduced produce appreciable