EVALUATION OF PULVERISED STRANDS OF CISSUS POPULNEA AS BINDER FOR PRODUCTION OF FOUNDRY CORES
EVALUATION OF PULVERISED STRANDS OF CISSUS POPULNEA AS BINDER FOR PRODUCTION OF FOUNDRY CORES
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Date
2011-08
Authors
Mfewase, Fidelis
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Abstract
Core binding properties of pulverised strands of cissus populnea plant were evaluated
with the view to adding to the list of core binders available locally. The strands of cissus
populnea were extracted from the stem of the plant, dried and milled to obtain a fine
powder that was sieved using sieve aperture of +200. Chemical analysis of the pulverised
strands showed that it had 6.1% fatty acids (lipids). Further analysis of the lipids showed
that the pulverized strands had 61.76% Freidelan-3-one by weight of the lipids. Cores
were produced using this powder as binder. The cores were baked at temperatures of 160,
180 and 2000C for a period of 1 to 2hours respectively. Baking time was varied at 30
minutes intervals. The maximum baked tensile strength of 1380KN/m2 was developed at
a binder content level of 7% at a baking time of 1.5hrs and baking temperature of 1600C.
A mathematical model was used to ascertain the reliability of the experimental data. This
model produced a coefficient of +0.99 which quite confirms the reliability of the process.
Trial casting of grey cast iron were made utilizing cores made with above composition
while a mix containing 5% binder, 7% water, 0.5% cassava starch and 87.5% sand,
baking time of 1.5hours and baking temperature of 1600C was used to make molds and
cores for the casting of aluminium alloys. The shake out as well as collapsibility of the
mould and cores was good. This suggests that cores made using this binder are suitable
for casting of both ferrous and non ferrous metals.
Description
A DISSERTATION SUBMITTED TO THE POSTGRADUATE SCHOOL
AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
IN PARTIAL FULFILLMENT FOR THE AWARD OF DOCTOR OF
PHILOSOPHY IN METALLURGICAL AND MATERIALS ENGINEERING
DEPARTMENT OF METALLURGICAL AND MATERIALS ENGINEERING
AHMADU BELLO UNIVERSITY, ZARIA
AUGUST, 2011
Keywords
EVALUATION,, PULVERISED,, STRANDS,, CISSUS,, POPULNEA,, BINDER,, PRODUCTION,, FOUNDRY,, CORES