Nickel base alloy glass shaping member
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United States of America Patent
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-
Mar 21, 1989
Grant Date -
N/A
app pub date -
Mar 30, 1987
filing date -
Mar 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An alloy having the following composition limits by weight: Chromium 13-15%, silicon 3.4-4.2%, boron 1.7-2.3% and the balance nickel, is cast in a mold that is made by the lost wax process from CaCO.sub.3, so that when the molten metal alloy is cast in the preheated mold at 2300.degree. F., held in a furnace at 1750.degree. F. for an hour, and then rapidly cooled to room temperature. The casting will have a fairly low hardness of R.sub.c 30.+-.3 so that it can be machined. After machining, the casting is heated to a temperature of 1150.degree. F. for at least three hours before cooling, resulting in a casting that is hardened to R.sub.c 45 to R.sub.c 50.
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