Argentium 960-Pure Gebruikershandleiding - Pagina 8
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Pagina afdrukkenInvestment casting Argentium 960-Pure
Argentium 960-Pure is suitable for smaller scale casting. For high volume casting, please use
'Argentium Professional Casting' alloys.
Flask burn-out
•
Allow the flask to stand for 2 hours before the burn-out cycle.
•
Do not overload the burn-out furnace - this ensures that the centre of all the flasks will reach the
required temperature for complete burn-out and that there is sufficient air-flow to remove moisture
from the cured investment powder.
Flask and metal temperatures
The following temperatures are for general guidance. Personal experience and knowledge of casting
equipment will enable judgement of the suitable flask and casting temperatures to use.
Size of object
Thin: 0.2 - 0.5mm
Medium: 0.5 - 1.2mm
Thick: >1.2mm
Crucibles
•
Use separate crucibles to avoid contamination from other alloys.
•
Clay graphite or pure graphite crucibles are recommended.
•
Silicon carbide crucibles are not recommended.
Accurate temperature control
•
Argentium silver displays a paler colour glow than traditional sterling silver when heated or molten.
•
Accurate temperature readings are important to prevent overheating.
Protective gas cover
•
Use an inert gas cover (i.e. argon or nitrogen).
•
The cast flask should be held under the inert gas protection for 1 minute before removal from the
casting chamber.
N.B. If a protective atmosphere is not available, flux can be used (boric acid is recommended). Skim
any oxides off the surface before stirring.
Removing flask from the casting chamber
After pouring the metal, remove the flask from the casting chamber within 1 minute.
Wet investment removal (suitable for castings without stones)
•
After pouring the metal, remove from the casting chamber within 1 minute and leave flasks to stand
for 25 minutes before quenching in water.
•
Castings can then be hardened by heat treatments (see page 5).
Dry investment removal (suitable for stone in place castings)
•
After pouring the metal, remove from the casting chamber within 1 minute and leave flasks to cool
for a minimum time of 90 minutes before quenching in water.
•
Remove investment residues by jet washing in water, followed by pickling, then rinse with water (do
not rinse in deionised water).
Metal casting temperature
(thinner object = hotter temp.)
1025-1005°C / 1877-1841°F
1005-990°C / 1841-1814°F
990-970°C / 1814-1778°F
Flask temperature
(thinner object = hotter temp.)
620-580°C / 1148-1076°F
580-520°C / 1076-968°F
520-480°C / 968-896°F
David Worcester
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