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Behaviors and Process Analyses of Spark Sintering for Powders Having a Low Sinterability
Matsugi, K. The Korean Powder Metallurgy Institute 2012 한국분말재료학회지 (KPMI) Vol.19 No.2
The sintering behaviors and process parameters of some compounds (carbides, oxides, sulfides, borides) were investigated experimentally. These compounds were successfully consolidated and showed high densities. Some unique phenomena such as retardation of grain growth, suppression of thermal decomposition and maintenance of initial non-equilibrium phases, were observed by the proper control of process in spark sintering.
Yong-Bum Choi,Takahiro Motoyama,Kazuhiro Matsugi,Gen Sasaki 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
A new process is proposed to fabricate an intermetallic compound reinforced aluminum alloy matrix compositeby using the reaction between porous nickel and molten aluminum alloy. The intermetallic compoundreinforced aluminum alloy composite was manufactured with the low-pressure infiltration processmethod. The amounts of the intermetallic compounds under 3 different specific surface area of porousnickel and the porosity inside composites were investigated. Porous nickel reacted with molten aluminumalloy at 973 K, and the intermetallic compound of Al3Ni was generated on the surface of the porous nickel. The generated intermetallic compound Al3Ni, was delaminated according to the difference of thermal expiationcoefficient with nickel. And the intermetallic compounds moves in the direction of aluminum matrix. The area fraction of the intermetallic compounds increased with the increasing specific surface area ofporous nickel. In addition, the defect inside the composite decreased by the increasing specific surfacearea of porous nickel.