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| Conventional mixing | |||||||||
| Vacuum mixing | |||||||||
| Mixing Instructions | |||||||||
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1
Determine the weight of powder and the volume of water.
2
Weigh out the powder and measure its temperature.
3
Adjust the water temperature so as to give a slurry temperature of 20ºC.
4
Measure the required volume of water into a clean mixing bowl.
5
Add the powder to the water.
6
Mix by hand for 30 seconds, to break up any lumps.
7
Mix by machine for a further 3 minutes.
8
Vacuum the investment in the bowl (not more than 2 minutes).
9
Pour the investment slowly down the side of the flask until the wax patterns are covered.
10
Vacuum the investment in the flask (not more than 2 minutes).
11
Let the flask stand undisturbed (at least 1 hour is best).
12
Remove sprue base and collar.
13
Place flask in furnace and follow an appropriate burn-out cycle. DO NOT EXCEED 740ºC.
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RECOMMENDED BURN OUT CYCLE |
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| i) | Ramp up at 250ºC per hour to 180ºC |
| ii) | Soak for 3 hours |
| iii) | Ramp up at 250ºC per hour to 630ºC |
| iv) | Soak for 5 hours |
| v) | Ramp down at 250ºC per hour to 500ºC |
| vi) | Cast at 500ºC |
14
Cast with metal.
