Nickel-Chromium Alloy / Dental Alloy

Nickel-Chromium Alloy / Dental Alloy : QLD nickel-chromium alloy (PFM) used to make PFM (porcelain-fused-to-metal) crown and bridge, high biological compatibility,non beryllium, is a trustworthy alloy. Low thermal conductivity; High resistance to corrosion; Biological compatibility assessed and certified by inspection organization; Stable physical properties; Strong bonding force between metal and porcelain; Expansion coefficient stable,safe and reliable;Percentage of weight of compositions: Ni 66%-74% Cr 20%-23%Mo 8%-9.5%Nb 0.8%-1 %Packing by box @ 1kg, cylinderPhysical Properties:Fusion Temperature 1200 - 1300 Hardness >21HRCTensile Strength > 250N/mm2Rate of Elongation > 5%Thermal Expansion Coefficient at 25-500 13.9×10-6k-1 at 20-600 14.1×10-6k-1Thermal Expansion Coefficient at 25-500 13.9×10-6k-1 at 20-600 14.1×10-6k-1 Instructions for Use:Wax PatternThe thickness of the wax pattern shall be at least 0.4 mm and the thickness of the casting after sanding and sand blast shall be at least 0.3 mm. In case of dental crown or long bridge that contains high percentage of metal, a metal reservoir can be installed after proof by experiment.EmbedmentCompatibility is available to the market generally accepted phosphate Ni-Cr porcelain embedment. Application shall be put under strict control according to the instructions provided by the embedding material manufacturers.CastingThis alloy can be cast with flame or through HF process. Porcelain crucible is selected. Do not overheat during fusion. Its better not to wait till the film is broken so as to avoid shrinkage cavities, bubbles, etc. It is suggested that only new metal be used to keep accuracy and nice outlook of the casting. For recycled application, only 30% of used metal can be added.After the cast ring is openedTo cut off the sprue according to the standard, sand the castingthen carry out sand blast ;Cleaning and OxidationClean the sand blasted casting with ultrasonic wave or steam and then carry out oxidation to the casting in the porcelain furnace in complete vacuum at 980. Time of holding is nor necessary for single crown and small bridge. If the bridge is too long, please hold for 2 minutes to avoid deformation.The whole Operating SequenceCasting cast ring opening cutting off sprue sand blast sanding cleaning oxidationsand blastcleaningporcelain coatingCautionThe product contains nickel. Those people who are allergic to nickel shall use it with caution.Good ventilation is required in the casting shop and sanding shop. Operators must wear gauze mask to prevent intake of metal powder through respiration to harm human body.