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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (17권5호 480-487)

Compositing Modes and Microstructures of Cu-X(=Al₂O₃,W)p Composite by Centrifugal Spray-Cast Deposition

원심분사주조법에 의한 Cu-X(=Al₂O₃,W)p 수식 이미지 복합재료의 미세조직 및 복합화

Cha-Hurn Bae, Hae-Yong Jeong

Pukyong National University

Abstract

Particle reinforced metal matrix composites(MMCs) via a centrifugal spray-cast deposition(CSD) process were fabricated by injecting second phase particles(Al₂O₃<40 μм, W<17.3 μм) into copper melt on the atomizing disc. Compositing modes were investigated by combining microstructures and mathematical modeling between Cu droplets and the reinforced particles injected. The Cu/Wp powders were shown that the W particles penetrate and get embedded in the Cu droplets. It is considered that the W particles composite preferentially in Cu melt on the atomizing disc. On the other hand, the Al₂O₃, particles did not penetrate into the Cu droplets on the atomizing disc but get attached in surface of Cu droplets during the flight. It is considered that the compositing may be attained in the flight distance which the relative velocity between Cu droplet and Al₂O₃, particle is maximum. The microstructure of the Cu/Wp and the Cu/( Al₂O₃)p composite preform was strongly influenced by compositing modes of droplets, and after subsequent deposition it was comprised as it is called the dispersed type and the cell type of microstructure, respectively.

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