Metal ve seramik tozlarının bilgisayar kontrollü tek eksenli kalıpta preslenmesi

Abstract

This study is about the investigation of the mechanical properties of metal and ceramic powders pressed by a uniaxial die. The bronze powders have spherical particles, copper powders are of oval, iron powders are of porous and alumina and silicon nitride powders are of irregular shaped particles. The measurements of microhardness in metal powders have been done up to 1000 MPa with 200 MPa intervals and they have been found to be 118, 134 and 195 kg/mm2, respectively, for copper, iron, and bronze powders. Since the particle size of ceramic powders considered were extremely small (dm?5 m?), it was not possible to measure their microhardness. Similarities in densification behaviour of seramic powders have been observed. Copper and bronze powders have displayed similar densification behaviours while an increased densification gradient is observed in iron powders. Severe deformations are observed in metal powders under scanning electron microscope examinations.