Composition:
Gold 75.0%
Palladium
17.9%
Indium 5.0%
Silver 1.0%
Tin 1.0%
Balance Ru, Ir
Color: Yellow
Applications: AURORA 75 is a high noble yellow colored ceramic alloy for single units, 3/4 crowns and short and long span bridgework.
Physical
Properites:
| Casting Temperature | 2408F (1320C) |
| Melting Range | 2012-2300F (1100-1260C) |
| Density (gm/cc) | 15.9 |
| Vickers Hardness | 245 |
| Tensile Strength | 90,000 psi |
| Yield Strength | 84,000 psi |
| Elastic Modulus | 15,000,000 psi |
| Elongation(%) | 5% |
| TCE x 10-6/C(500C): | 14.6 |
Recommended
Processing:
| Recomended Solders | Pre YSF, Post 585 |
| Recommended Investment |
Soldering: Pre solder using Gateway YSF solder without flux. Post solder using 585 solder.
Spruing:
Single crowns - Direct method with 8 ga. sprues and adequate resevoirs.
Multiple Units and bridges - Use 6 ga. runner bars with 10 ga. sprues to units and 8 ga sprues to the sprue base.
Investment: Use a carbon free high-heat phosphate-based investment following the manufacturer's instructions.
Burnout: After adequate set-up time, place ring(s) in oven at room temperature and raise temperature to 800F (425C) and hold for 30 minutes. Raise temperature to 1300F (704C) and hold for 1 hour plus ten minutes for each additional ring.
Melting and Casting: AURORA 75 has a casting temperature of 2408F(1320C). Use a fuel/oxygen torch with multiorifice tip. Do not use flux. Allow to bench cool before divesting. Add 50% new material to buttons. Do not use graphite crucibles.
Finishing: Casting may be blasted using 100-150 micron aluminum oxide. Shape and finish leaving a slightly rough surface on all porcelain bearing areas.
Degassing:Place units in a 1300F (704C) oven and raise temperature to 1900F (1040C) without vacuum at a heating rate of 100F/min (56C/min). Remove at once and bench cool. Remove oxide with new 100-150 micron aluminum oxide. Clean in distilled water in ultrasonic cleaner for 10 minutes.
Opaquing: Follow porcelain manufacturer's instructions.
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