Examinations of the General Equations by Copper Infiltration into Sintered Iron Compacts

Abstract

In our previous papers, we presented general equations concerning infiltration through one surface and all surfaces of a model sintered skeleton based on a rectangular parallelopiped having same-radius straight-cylindrical pores crossing at right angles on three dimensions and examined them by some experiments using sintered iron skeletons and water infiltrant and pure silver infiltrant hardly alloyed to iron. The present report, by doing an experiment with sintered iron skeletons and copper base infiltrant easily alloyed reaction to iron, clarifies that these two equations are also applicable in the first half period of the infiltration time, as follows :
1) The general equation of infiltration through a single side of a skeleton is,
V=P_r⋅S₁⋅(R⋅γ_LV⋅COSθ/18η_L)^1/2⋅t^1/2
2) The general equation of infiltration through all surfaces of the skeleton is,
V=P_r⋅S_A⋅(R⋅γ_LV⋅COSθ/18η_L)^1/2⋅t^1/2
where, V : volume of the liquid infiltrated(cm³), P r : porosity of the skeleton, S₁: infiltration area of the skeleton(cm²), γ_LV: surface tension of the liquid(g/s²), R :radius of the pore(cm), θ : contact angle between the skeleton and the liquid(deg), η_L: viscosity of the liquid(g/cm-s), t : infiltrating time(s), S_A: 2 (S₁+S₂+S₃)[total surface area of the skeleton] (cm²).