Foreign Object Damage Resistance of Silicon Nitride and Silicon Carbide

Abstract

To clarify the foreign object damage (FOD) resistance of ceramics, chipping fracture mode and flexural fracture mode were investigated using several types of Si3N4 and Sic. The critical velocity which is the threshold impact velocity of the projectile for chipping fracture and flexural fracture was determined. The critical velocity of the chipping fracture mode is explained as a function of Kga-", and depends on the hardness and the shape of the projectile. The critical velocity of the flexural fractu.-e mode is explained as a function of ~y t ' '~. The mechanisms of impact damage are discussed. [Key words: mechanical properties, fracture toughness, silicon nitride, silicon carbide, impact.]

Silicon Nitride and Related Materials

“…These applications are not the very-hightemperature applications originally envisaged, but rely on the low density (and mass and inertia) of the Si 3 N 4 component coupled with high strength and toughness required to withstand impact damage. 203 Current development work concerns the cautious further introduction of Si 3 N 4 components to diesel and sparkignited engines, in locations where low mass and improved wear resistance are required, such as exhaust valves, valve spring retainers, bucket tappets, rocker arm pads, 204 and valve springs ( Fig. 22).…”

On the mechanics of fracture in monoliths and multilayers from low-velocity impact by sharp or blunt-tip projectiles

“…Ref. [31]). An analogous class of problems is chipping in brittle materials, where it is the free surface near the loading point which helps draw the crack to instability.…”

Solid particle erosion of Al alloy and Al-alloy composites: Effect of heat treatment and angle of impingement

“…Some of them are the rotor, gas turbine blades of a helicopter engine, boiler, heat exchanger tubes, burner nozzles, pumps and valves, compressors, etc. [1][2][3][4][5] Lightweight metal matrix composites have exhibited an excellent combination of improved physical, mechanical, and tribological properties over base alloys and thus have emerged as potential materials for aerospace, automobile, and other engineering components. [6][7][8][9][10] In recent years, aluminum alloy composites (AACs) have reached the commercial production stage especially for automobile applications such as brake drums, pistons, and cylinder liners.…”