B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/155
B22D 13/00 (2006.01)
Patent
CA 1054336
IMPROVED INVESTMENT CASTING PROCESS OF CHROMIUM-COBALT AND/OR NICKEL ALLOYS Abstract of the Disclosure An improved investment casting process for producing dental restorations, particularly a dental crown, comprising steps of fixing a wax pattern onto a truncated cone in a metallic ring having a lining of a cushioning material, pouring an investment material into the space around the wax pattern in the metallic ring, drying the resultant, melting out the invested wax pattern, curing the resultant at a tem- perature of 700 to 950°C for 20 to 150 minutes to give a mold, fixing the mold thus obtained to a centrifugal casting machine and casting a molten chromium-cobalt and/or nickel alloy in the mold maintained at a temperature of 100 to 500°C. Notwith- standing the high melting point of the alloy, the cast product has excellent surface smoothness, excellent dimensional accuracy, excellent durability and high chemical resistance.
242751
Ito Michio
Nagasawa Sakae
Suzuki Sigeo
Takahashi Shigeo
Matsumoto Dental College
Sumitomo Chemical Company
LandOfFree
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