Experimental Studies On Equivalent
Thermal Properties Of Particle-reinforced
Flexible Mould Materials
Author(s)
A. K. Nandi, C. Cingi & J. Orkas
Abstract
The investment casting process uses wax patterns which may be produced using
the soft tooling process where the common flexible (polymer) mould materials
used are polyurethane rubber, silicone rubber, etc of a typical kind. However,
due to poor thermal conductivity of these materials, solidification time of (wax)
patterns takes longer yielding to reducing rapidity of the process to a great
extent. This problem may be overcome by increasing thermal conductivity of
mould material that can be achieved either by molecular orientation of polymer
itself or by addition of conductive fillers into polymer. The method of controlled
addition of thermal conductive (particulate) fillers into mould material may be
adopted by realizing it as a most simpler and easy to implement technique in
industry. In this article, we have carried out an experimental study to find the
affects on equivalent thermal properties of flexible mould materials reinforced
with conductive filler particles. Two different types of particles (aluminium and
graphite) with different morphological characteristics are considered as fillers.
The measurement of thermal properties is carried out by transient plane heat
source technique. It is found that as much as 10-fold increases in thermal
conductivity and thermal diffusivity values of mould materials reinforced with
conductive fillers. In explaining the experimental results by several
empirical/semi-empirical models, it is observed that the Lewis–Nielsen model
provides a good estimation, while the Agari–Uno model (fitted with
experimental data) shows better agreement than other models.
Keywords: soft tooling process, flexible mould material, particle reinforced
polymer composite, equivalent thermal properties, transient plane heat source
technique.
Keywords
soft tooling process, flexible mould material, particle reinforced
polymer composite, equivalent thermal properties, transient plane heat source
technique
Related Book
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