Cobalt Chromium Alloy
We supply Cobalt-Chromium alloy bean TYC, which is an ideal non-precious metal for dental applications, such as crowns, short and long span bridges, implant superstructures and partial dentures.
- Risk to generate bubble or crack in forming porcelain is greatly reduced since this material is from vacuum melting furnace.
- Refining crystals of cobalt chrome alloy to enhance mechanical property by adding gallium.
- With the difference between liquidus point and solidus point as much as 155℃, high castability is provided.
- It is chemically stable and excellent in corrosion resistance and tarnish resistance in the oral cavity without losing graceful white gloss.
- Compared with precious metal family, material cost is much lower.
Nb, Fe, B Si <1.0
Density 8.5 g/cm3
Melt Range 1175-1385 °C
Casting temperature 1450-1500 °C
Vicker Hardness 340
0.2% Proof Strength 500 MPa
Modulus of elasticity 198 MPa
Thermal expansion coefficient 14.0 x 10-6/K
Net Weight: 300g and 1,000g
MODELING Single crowns require a thickness of minimum 0.3 mm; abutment crowns thickness a minimum of 0.5 mm. Avoid sharp angles.
BURN-OUT The suggested burnout temperature: 800-850°C/1470-1560°F
MELTING AND CASTING Use a separate ceramic crucible for each alloy and preheat the crucible in the burnout furnace.
Always use fresh alloy. Depending on the type of casting machine, follow the manufacturers instructions for use. After casting bench cool to room temperature. Casting Temperature: 1450-1500°C/2640-2730°F
METAL PREPARATION Carefully divest and clean the object with Al2O3. Do not use a hammer for divesting the object to
prevent deformation. Finish the framework with carbide burs or with ceramic-bonded grinding instruments. Blast surface with 50-100 micron Al2O3 at max. 4.5 bar pressure. Subsequently, clean with ultrasonic or steam. Avoid inhalation of dust during grinding.