Fundamental investigation of functionally gradient material manufacturing system using centrifugal force.

Wear Properties of Intermetallic Compound Reinforced Functionally Graded Materials Fabricated by Centrifugal Solid-particle and In-Situ Methods

“…A number of processes have been proposed for the fabrication of FGMs, including adhesive bonding, sintering, thermal spray and reactive infiltration, (1,2) as well as the so-called centrifugal method (2)(3)(4) . The centrifugal method allows for the creation of a gradient compositional distribution in metals containing powder or intermetallic particles, owing to the difference in density between the molten metal and the reinforcement (3,4) .…”

“…The centrifugal method allows for the creation of a gradient compositional distribution in metals containing powder or intermetallic particles, owing to the difference in density between the molten metal and the reinforcement (3,4) .…”

“…One product of the centrifugal solid-particle method is Al-Al 3 Ti FGM, which contains anisotropically oriented Al 3 Ti platelets in the Al matrix (7)(8)(9)(10) . Figure 1 shows a schematic representation of the arrangement of the Al 3 Ti platelets in an Al-Al 3 Ti FGM ring, which is the typical shape of the finished product fabricated by the centrifugal method. The Al 3 Ti particles are oriented with their platelet planes nearly perpendicular to the radial direction (the direction of the centrifugal force).…”

Review Fabrication of Functionally Graded Materials under a Centrifugal Force

“…Generally, the segregation, caused by the density-difference between particles and molten metal, must be avoided. However, it is possible to create a compositional gradient due to the difference in material density (Fukui, 1991, Watanabe et al, 1998. Figure 4 shows the apparatus used for the centrifugal method.…”

“…3 (a), a centrifugal force applied to a homogeneous molten metal, dispersed with ceramics particles or intermetallic compound particles, drives the formation of the desired gradation. The composition gradient is then achieved primarily by the difference in the centrifugal force produced by the difference in density between the molten metal and solid particles (Fukui, 1991, Watanabe et al, 1998. It is known that the motion of particles in a viscous liquid under a centrifugal force obeys the Stokes' law (Kang & Rohatgi, 1996, Watanabe et al, 1998, Ogawa et al, 2006 force to the gravity), gravitational acceleration, particle diameter and viscosity of the molten metal, respectively.…”