Abstract
Abrasive jet machining (AJM), a specialized form of shot blasting, is considered one of the most hopeful micro machining methods for hard and brittle materials such as glasses and ceramics. This paper describes an elementary approach to the characterization of fundamental AJM properties for silicon nitride. In dimpling of the Si3N4 surface, the material removal was identified by mild wear within the grain particles in a manner resembling ductile behavior. Moreover, effects of several AJM operating parameters, e.g. jet pressure, jet distance, abrasive type and size, on the machinability have been empirically evaluated. A proper selection of the jet distance can maximize the machining efficiency, although it is recommended to reduce jet distance as much as possible in order to decrease the dimple diameter. The machinability of the AJM process is strongly dependent on the abrasive particles; with harder and/or larger jet particles, the material removal rate increases and the resulting surface roughness deteriorates.
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