Process and Two Types of Ceramic Core in Investment Casting
Ceramic cores are used to produce Intricate Internal Shapes in
production of Investment Castings. With the help of Ceramic
Cores, critical castings applied in Power Generation,
Automobile, transmission and other industries can be done in
These are two different types of Ceramic Cores, One produced by
Injected Ceramic Cores and the other is chemically Gelled
We have developed Injected Ceramic Cores for Investment Casting
process and other applications. Presently we are offering
Finished Ceramic Cores, ready to use Refractory Mix for Injected
Ceramic Cores and the Technology for producing Injected Ceramic
Here we are briefly introducing the Ceramic Core production
process and the basic comparison between the two types of the
A. Injected Ceramic cores
The production steps of the injected Ceramic Core are as follow:
1. Injecting the refractory mix bled into the core cavity after
solidification the green core is removed from the cavity.
2. After inspecting the core it is packed in the ceramic flour
and sintered in the furnace.
3. After sintering of the core it is used in the wax pattern
The main advantages of the injected ceramic cores:
*As the refractory mix is blended in the bulk qualities and then
it is used for the injection of ceramic cores. The consistency
of the ceramic cores is reliable whereas in case of gelling
ceramic core, for production of individual ceramic core the
refractory mix is measured and mixed with the binder. This could
be affecting the variation, resulting in inconsistency.
*The surface finish and physical properties of the Injected Core
quality is better than any other types of cores.
*While backing of the gelled ceramic cores due to the stress
release, there are chances of bending, elongation and surface
cracks. As the injected cores are packed in ceramic materials
the chances of bending and cracking are eliminated.
*Incase of gelling ceramic cores the gel time must be maintained
very accurately. If the pouring takes more time then the gelling
time, the gelling of the mix take place before pouring and this
results in wasting the refractory and binder material. And if
the pouring is done much earlier than the gelling time, the
solid particles settle down in the cavity resulting in the
uneven properties. While in case of injected ceramic cores
rejected green cores risers and getting can be also reused.
Injecting this material in the cavity is as easy as injecting a
*The shelf life of the refractory mix is as good as a Pattern
Wax. Where as in case of gelling binder material have a very
limited shelf life.
B. Chemically Gelled Ceramic Cores
The production steps of chemically gelled ceramic core are as
1. Refractory mix of the known quantity is mixed with the liquid
binder, for each single core to be produced.
2. After mixing the binder with the refractory mix, a gelling
solution is added while continues stirring.
3. After the pre calculated gel time the mix is poured in the
core cavity and after setting of the core it is removed from the
cavity and fired.
4. The fired ceramic core after finishing is used in a die
cavity to inject the wax pattern.
Disadvantages of Chemically Gelled Ceramic Cores:
*High wastage and rejection percentage.
*No suitable for mass production.
*Low hardness and strength, could not withstand the Wax
Injection pressers when using the cores for wax pattern
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