US1556776A - Material for resisting oxidation at high temperatures - Google Patents

Description

Patented ca. .13, 1925.

PATENT oFHcE.

nunonrn '1'. FLINTEBMANN, on DETROIT, moment.

,MA'I'ERIAL- FOB RESISTING OXIDATION Ail? HIGH TEMPERATURES. i

No Drawing.

, To all whom it may concern:

Be it known that I, RUDOLPH F; FLINTER- MANN, a citizen of the United States of America, residing at Detroit, in the county 5 of'Wayne and State of Michigan, have invented certaizr new and useful Improvements in Materials for- Resisting Oxidation at High Temperatures, of which the following is a specification, reference being had therein ,to the accompanying drawings.

The invention relates tomaterials which have the property of resisting oxidation when subjected to high temperatures, and it is the object of the present invention; first, to obtain an alloy which is formed of relatively vinexpensive metals; second, to avoid difliculties in the process of compounding the alloy; third, to obtain resistivity to oxidation; and fourth, to combine with said property ofresistivity other desirable properties, such as closeness of grain, a small coeflicient of expansion, malleabilityv and ductility, jetc. To this end the invention consists in the alloy as hereinafter set forth.

My improved alloy consists of nickelror cobalt from twenty to sixty per cent, silicon from three to nine per cent, not to exceed three percent of some grain closing metal suchas titanium,*-molybdenum, vanadium, tungsten, uranium or calcium, with the bal- 'ance of the alloy composed of iron. It is understood that the term- .iron" 'in' the above specification refers not to chemically pure iron but to-iron containing the elements.

2 carbon, manganese, sulphur and phosphorus in proportions usual in'comm'ercial iron'or steel. The alloy is formed by .melting 111' a refractory lined furnace having asuitablesource of. heat the proper pro ortion-s of nickel or cobalt and silicon an ironand one or more of the grain closingingredients abovementioned preferably one of which is Etitanium.

The alloy above-described is free from v defects common-to manyoxidation resisting 1 alloys such as (a) Lack of handling in the foundry.

fluidity necessary .for. ease of Application filed' February 14., 1921. Serial No. 444,765.-

(lo) Lack of strength during solidifying of cracked castings;

and cooling in mold resulting in production.

() Lack of ductility, both hot and cold.

it?) Lack of mechanical strength when co v (e) Tendency to 'crack upon sudden change in temperature;

(f) Inability to Withstand quenching in water from elevated temperatures,"

(g) Loss of ductility by water quench- In addition to being free from the above defects the alloy as described possesses a high degree of resistivity to oxidation. It"

is suitable either for casting to, shape desired or for casting in billets to be forged, rolled, or drawn to shape desired;

' One function performed by the'nicliel or cobalt of alloy is the reduction in the co-- efiicient of expansion'which lessens the danger of cracking on sudden changes in temperature. I I

- What I claim as my invention is:-v

1. An alloy for resistmg oxidation at high temperatures containing nickel orcobalt in an amount greater than 20% and less than 60%, silicon an amountgreater than 3%- than 9% and the balance lpriifcipally and less of iron.

2.- An alloy for resisting oxidation at" high "temperatures containing more than 20% and less than 60% of nickel-or cobalt, more than 3%, and less than 9% of sili com-not to ex coed 3 of titanium, or molybdemnm'brj vanadium or tungsten, or uranium, or cal i cium, the balance of thei alloy being principally iron.

' 3'. 'An alloy less than 60% of nickel or, ri obalt, more than 3% and less than 9% of si icon,'-and,not to exceed 3% of titanium, the balance of the alloy being principally iron.

In testimony whereof I aflix my signature;

RUDQLPH F. 'ELINTERMAN1\{.-

for-resisting oxidation at temperatures containing more than 20% and