AMERICAN DENT-ALL,INC - zhengzhou yadent new

PRODUCT NAME:Dental Alloy
TYPE:DAMCAST NB
User's manual
Damcast NB, A high strength nickel chrome with beryllium alloy, used for dental ceramic
restorations
Technical Data & Compositions
Melting Range
1232℃- 1288℃
Nickel
76 %
Yield Strength
552 MPa
Chrome
15 %
Elongation
11 %
Molybdenum
5%
Density
7.9 (g/cc)
Aluminium
2%
Coefficient of the Liner Expansion
(25-500℃)
13.8 X 10-6K-1
Beryllium
1.7%
others
<3%
Instructions for use
WAXING: Mininum metal thickness (after grinding) should be 0.3mm.Waxing could be as thin as
0.3 mm to 0.35 mm.
SPRUEING:
A- Direct for single units. Sprueing should be 6 mm in length. Based on the size and the
thickness of crowns use 6-8 gauge sprues.
B- Indirect for multiple units. Use straight 8 gauge sprue, about 3 or 4 mm in length, and
connect it to the unit.
For long spanned bridges use and additional sprue connected to the last unit.
INVESTING:Use high heat investments; follow the manufacturer's instructions carefully.
After investment has set, scrape the top of the investment to allow gases to escape.
BURNOUT:Place the ring in the furnace at room temperature,increase the temperature to
980-1050°C ,with one hour holding time. Add 10/15 extra minutes for each additional ring.
MELTING & CASTING:
Can be melted with the induction machine or with gas/oxygen torch.
A- Torch casting: Use multiple orifice torch tips. Do not use crucible used for other
B-
alloys.Move the torch allowing even distribution of heat. Adjust oxygen regulators at
approximately 10-13 kg. Adjust Propane valves until the inner flame cone is blue and
approximately 12mm long; the outside of the flame cone should be 80mm from the inner
cone. Preheat the crucible. Release the casting arm when the ingots lose definition and
puddle: molten ingots usually vibrate from the force of the flam.Bench cool the cast until
the redness goes away.
Induction Casting: Set the temperature to 1400℃. Set the casting arm speed between
425 and 450 rpm. When ingot pool together and shadow disappears, release the arm.
METAL FINISHING: Sandblast the investing with pure non-recycled aluminum oxide. Do not
smooth the surface of the frame bearing porcelain. Use carbides, discs, diamonds and stones for
metal finishing.
METAL PREPERATION: Sandblast the area bearing porcelain, and do not touch the area
accepting porcelain; clean with ultrasonic cleaner. De-gasing the metal is to achieve the desirable
oxidation. Place the metal work in a furnace at 650℃, creates a vacuum and increase
thetemperature 38℃ per minute to 980-1020℃; brake the vacuum and let it cool down.
OPAQUE & PORCELAIN APPLICATION:
Bonding slurry must be applied to all surface bearing porcelain, apply slurry and dry it quickly in
the oven with open muffle; fire the slurry coating in ten degrees higher temperature, as per
instructions for opaque. Quicker method is using the same procedure with degas procedure. Use
opaque manufacturers instructions. Try to complete opaque firing in a single step.
PORCELAIN APPLICATION: Follow the instructions of the ceramics manufacturers. Building up
your porcelain and try to save extra firing.
Note: For best results use at least 50% new metal with 50% sandblasted and cleaned buttons.
Caution: This alloy contains Ni & Be, not to be used in individuals with Ni sensitivity. Inhalation of
Be dust and fumes can be toxic, grind and polish with adequate ventilation and wear protective
clothing.
ZHENGZHOU YADENT NEW-MATERIALS CO.,LTD
Huagongxi road,high-tech development zone,zhengzhou,china