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Arloy #3

Nickel-chromium alloy with no-beryllium offers superior bond strength. Arloy #3 works with maryland bridge techniques, ideal for single, multi-unit and longspan bridgework, compatible with most popular porcelains. It is economical and enables the user to produce thinner frameworks. It is easily cast, soldered and polished to high luster finish.
 
recommended procedure 

 

WAXING:8-10 gauge sprues, direct casting for single units and indirect method for multiple units.

INVESTING: Any carbon free high heat investment is recommended. Use non-asbestos ring liner. Bench set 1 1/2 Hrs. Place in cold furnace and gradually bring up to 1650°F. Hold for 1 1/2 hrs.

 

CASTING: High Heat quartz crucibles are recommended, along with a multi?orifice torch, using a gas/oxygen mixture or in an electric induction casting machine. When the ingots completely slump the alloy is then ready to be cast. After casting, bench cool to room temperature.

FINISHING: Grind the metal with non?contaminated aluminum oxide stones. After grinding, blast with non?recycled 50 micron aluminum oxide, and clean in distilled water in ultrasonic cleaner for ten minutes.

DEGASSING: Place the castings in the furnace at 1200°F (650°C) and raise to 1800°F (980°C) with full vacuum. No hold. Remove of oxide is optional.

OPAQUE: Apply opaque wash and bake. Then full opaque coat and bake.

 

major components 

NICKEL = 76.0% NOMINAL
CHROME = 12.0% NOMINAL
MOLYBDENUM = 4.65% NOMINAL
BERYLLIUM = 1.8% NOMINAL 

physical properties 
Coefficient of Expansion, @ 500C= 14.1 x 10
Elongation = 16%
Ultimate Strength = 76,000 psi
Yield Strength = 40,000 psi
Brinnel Hardness = 225
Casting Temperature = 2400°F-2450°F 
CAUTION: Persons with known nickel sensitivity should avoid using this alloy. Dust can be toxic. Grind and polish in well-ventilated area.