China Dental Lab Alloy Zaire Chrome-Cobalt Base Partial Denture Alloy, Find details about China Dental Lab Alloy, Dental Ceramic Alloy from Dental Lab Alloy Zaire Chrome-Cobalt Base Partial Denture Alloy
Physical Data
Melting Range | 1320°c-1380°C (2408°F-2516°F) |
Casting Temp | 1454°C (2650°F) |
Hardness | 330 HV |
CTE | - |
Yield Strength | 96,000 PSI |
Tensile Strength | 108,000 PSI |
Elongation | 6% |
Density | 8,70 g/cm3 |
Specific Gravity | 8,40 g/cm3 |
Chrome-Cobalt Base Partial Denture Alloy
None-Precious Alloy
Zaire
Ingredients | Cas # | % Composition by weight |
---|---|---|
Cobalt (Co) | (7440-48-4) | 60-62% |
Chromium (Cr) | (7440-47-3) | 28-30% |
Molybdenum (Mo) | (7439-98-7) | 5-6% |
Silicon (Si) | (7440-21-3) | <1% |
Manganese (Mn) | (7439-96-5) | 1% |
Iron (Fe) | (7439-89-6) | <1% |
Carbon (C) | (7440-44-0) | 0.30-0.40%* |
(*) 0.30% Carbon 330HV. ("Zaire" w/ regular hardness) (*) 0.40% Carbon 360HV ("Zaire" hard)
Use investments for high-heat Chromium-Cobalt partial denture alloys only. Burnout at the temperatures and time recommended by the investment manufacturer or at a minimum of 1,850°F (1,010°C) for 1.5 hrs.
It is crucial to follow the manufacturer's instructions in the operation of your specific equipment, due to the various types of induction machines available on the market (such as Manual, Semi-Automatic, and Fully Automatic, etc.). Exercise care in placing virgin metals or buttons in the crucible. Do not drop in ingots. Instead, use large tweezers to load the crucible, which will help prevent cracking of the crucible. For manual operators, when all the metal has melted together as one joined mass, release machine immediately to prevent overheating of the metal.
*Cut the sprues
*Trim remaining metal from sprues
*Clean up the inside of clasps and uprights with Taper Stone
*Grind or trim tight areas with an Inverted Cone
*Go over the entire case with a Small Barrel for polishing
*Sandblast and prepare for polishing
Use conventional electropolishing systems accepted and recommended for high-heat Chromium-Cobalt partial denture alloy only. Consult manufacturer's instructions and specifications for proper operating procedures. Rubber point all clasps and go over all surfaces that have been rubber wheeled.
When melting, grinding, or polishing alloy, use adequate ventilation, vacuum systems, protective eyewear, and protective masks and clothing.