Lubricant for forming metals at elevated temperatures
AssigneeArthur D. Little, Inc.
InventorsD. William Lee, John L. O'Brien, Michael Rossetti
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Abstract
A lubricant for forming a ferrous metal blank into a preselected configuration by warm- or hot-forming procedures. The lubricant is an alkali-modified borate glass containing a minor mole percent of an alkali metal oxide, preferably sodium oxide. The glass is formed in situ on the surface to be lubricated by depositing on the surface a glass-forming mixture of a source of boron oxide and an alkali metal borate and then heating the mixture to form the glass.
Claims7
A liquid coating composition for applying to a ferrous surface to serve as the precursor of a lubricant to be used during forming under pressure at an elevated temperature between about 1100.degree. F. and 2300.degree. F., characterized as being a slurry of a mixture consisting essentially of a source of boron oxide selected from the group consisting of boric acid and boric oxide and an alkali metal borate in a liquid vehicle which serves no lubricating function, said alkali metal borate being present in said mixture in an amount to provide between about 5 and about 10 mole percent of alkali metal oxide when said mixture is heated to form therefrom an alkali-modified borate glass which has a viscosity ranging between about 500 and about 1500 centipoises at said elevated temperature.
Dependencies are inferred from the claim text.