Method for preparation of VO.sub.2 current inrush limiters for incandescent lamps
AssigneeWestinghouse Electric Corp.
InventorsJames P. McHugh, Philip J. Nalepa, Robert C. Miller, Chester W. Dawson
Life of this patent
Estimating the term…
Abstract
Current inrush limiter for incandescent lamps is made by mixing finely divided vanadium sesquioxide and vanadium pentoxide with finely divided glass-forming constituents which include vanadium compound. The mix is compacted and sintered in a substantially inert atmosphere which converts the vanadium oxides to vanadium dioxide maintained in a chemically stable and mechanically strong mass by vitreous binder.
Claims15
The method of making a current inrush limiter for incandescent lamps substantially comprising vanadium dioxide particles maintained in a chemically stable and mechanically strong mass of predetermined dimensions by a glassy matrix binder, which method comprises:
- a. mixing together finely divided vanadium sesquioxide and vanadium pentoxide wherein the molar ratio of said finely divided vanadium sesquioxide to said finely divided vanadium pentoxide is from 1:1 to 2:1 together with finely divided glass-forming constituents which include at least one of vanadium oxide and metallic vanadate, with the weight ratio of said total finely divided vanadium sesquioxide plus vanadium pentoxide to said total glass-forming constituents being from 98:2 to 70:30;
- b. compacting said mixture into the shape desired for said limiter;
- c. sintering said compact in a substantially inert atmosphere at a temperature of from about 800.degree. C to about 1100.degree. C for a sufficient period of time to react and convert the mixed vanadium sesquioxide and vanadium pentoxide particles to vanadium oxide and to form said glass-forming constituents into said glassy matrix binder.
Dependencies are inferred from the claim text.