US1641752A - Oxidation-resisting material - Google Patents

Oxidation-resisting material Download PDF

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Publication number
US1641752A
US1641752A US329828A US32982819A US1641752A US 1641752 A US1641752 A US 1641752A US 329828 A US329828 A US 329828A US 32982819 A US32982819 A US 32982819A US 1641752 A US1641752 A US 1641752A
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United States
Prior art keywords
oxidation
alloy
aluminum
percent
resisting material
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US329828A
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Rudolph F Flintermann
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General Electric Co
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General Electric Co
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium

Definitions

  • RUDOLPH F FLINTERMANN, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW -'YORK.
  • the invention relates to metallic alloys which are resistive to oxidation at high temperatures, and it is the, object of the invention to obtain a material which combines 6 with this characteristic other valuable properties.
  • certain known alloys have the property of resisting destructive oxidation under. high temperature by the formation of a protecting coating 10 of oxide of one of the ingredients on the exposed surface.
  • These materials while useful for many purposes such, for instance, as electrical resistors, are lackingin properties essential to other uses in the arts.
  • such alloys are usually lacking in tensile strength, are coarse grained and liable to fracture in casting. I have discovered a means for correcting these objectionable characteristics and have obtained a product which, in addition to its oxidation-resisting quality, possesses other valuable physicalproperties.
  • ferrous alloys are preferable to alloys using less abundant metals. It is known that a small percentage of aluminum combined with iron will form a durable material for an electrical resistor, but such an alloy is not suited for other uses for reasons above described. Thus, inost of I0 the useful characteristics of" iron and steel, such as high tensile strength, fine grain, etc., are destroyedby the addition of a relatively small percent of the aluminum. I With the present invention the objectionable characteristics are eliminated and I have discovered, as one means of effecting this result, a specific proportion of the ingredients.
  • the aluminum and the iron or steel are separately melted at temperatures correspondin to their respective fusing points.
  • the fiised metals are then thoroughly commingled under conditions protecting the same from excessive oxidation.
  • Titanium, or other grain-refining element is also introduced into the mixture and thoroughl commingled.
  • a rockmg furnace is suitable for this purpose and preferably one in which the heat is generated electrically, the metals being protected by a neutral gas or slag.
  • the new product is useful for many purposes, one specific instance being the manufacture of carbonizing boxes. Suchboxes are exposed at high temperature to an oxidizing atmosphere, and as they are filled with metallic articles which are bei heattreated, a considerable amount of mec anical strength is required. My alloy is both oxidation resisting and of suflicient mechanical strength to be used for such purposes.
  • a heat resisting ferrous alloy having an r aluminum content of from 12 to 20 percent and at least one per cent of a grain-refining material.
  • a heat resisting ferrous alloy having an aluminum content of from 12 to 20 percent and at least one per cent of titanium.
  • a ferrous alloy having an aluminum content of approximately nineteen and onehalf percent and at'least one per cent of a grain-refining material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Description

I Patented Sept. 6, 1927.
UNITED STATES PATENT OFFICE.
RUDOLPH F. FLINTERMANN, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW -'YORK.
No Drawing.
The invention relates to metallic alloys which are resistive to oxidation at high temperatures, and it is the, object of the invention to obtain a material which combines 6 with this characteristic other valuable properties. In the present state of the art certain known alloys have the property of resisting destructive oxidation under. high temperature by the formation of a protecting coating 10 of oxide of one of the ingredients on the exposed surface. These materials, while useful for many purposes such, for instance, as electrical resistors, are lackingin properties essential to other uses in the arts. In particular, such alloys are usually lacking in tensile strength, are coarse grained and liable to fracture in casting. I have discovered a means for correcting these objectionable characteristics and have obtained a product which, in addition to its oxidation-resisting quality, possesses other valuable physicalproperties.
Because of their low cost, ferrous alloys are preferable to alloys using less abundant metals. It is known that a small percentage of aluminum combined with iron will form a durable material for an electrical resistor, but such an alloy is not suited for other uses for reasons above described. Thus, inost of I0 the useful characteristics of" iron and steel, such as high tensile strength, fine grain, etc., are destroyedby the addition of a relatively small percent of the aluminum. I With the present invention the objectionable characteristics are eliminated and I have discovered, as one means of effecting this result, a specific proportion of the ingredients. Thus where aluminum is used as the protectivia element and is combined with iron or-steel, I have discovered that an alloy having nineteen and one-half percent of the aluminum has a much greater tensile strength than any alloy with a larger or smaller percentage of this ingrediept and I use these metals in these proportions to obtain this result.
'Another corrective for the objectionable properties is the introduction into the alloy of a material having grain-refining characteristics. I have discovered that for aluminum steel alloy a suitable grain-refining material is titanium in the proportion of from one to five percent. Other metals which ma be employed for this purpose are nicke chromium, vanadium, manganese, molyb- Apfpllcation filed October 10, 1919. Serial No. 829,828.
denum, tungsten, cobalt, zirconium, silicon, Bl uranium, boron, magnesium, copper and cerium. v
In the manufacture of the alloy the aluminum and the iron or steel are separately melted at temperatures correspondin to their respective fusing points. The fiised metals are then thoroughly commingled under conditions protecting the same from excessive oxidation. Titanium, or other grain-refining element, is also introduced into the mixture and thoroughl commingled. I have found that a rockmg furnace is suitable for this purpose and preferably one in which the heat is generated electrically, the metals being protected by a neutral gas or slag.
, In casting the metal it is of the utmost importance to prevent the inclusion of any oxide of the metal in the molten mass within the mold cavity and I use methods of casting that exclude and prevent the intermingling of any oxide of either metal in the mass of the metal.
The new product is useful for many purposes, one specific instance being the manufacture of carbonizing boxes. Suchboxes are exposed at high temperature to an oxidizing atmosphere, and as they are filled with metallic articles which are bei heattreated, a considerable amount of mec anical strength is required. My alloy is both oxidation resisting and of suflicient mechanical strength to be used for such purposes.
What I claim as my invention is:
1; A heat resisting ferrous alloy having an r aluminum content of from 12 to 20 percent and at least one per cent of a grain-refining material.
2., A heat resisting ferrous alloy having an aluminum content of from 12 to 20 percent and at least one per cent of titanium.
3. A ferrous alloyhaving an aluminum content of approximately nineteen and onehalf percent and at'least one per cent of a grain-refining material.
4. 'A'ferrous alloy having an aluminum content of approximately nineteen and onehalf 'percent and from one to five per cent of titanium.
In testimony whereof I aflix my signature.
RUDOLPH F. FLINTERMANN.
US329828A 1919-10-10 1919-10-10 Oxidation-resisting material Expired - Lifetime US1641752A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768915A (en) * 1954-11-12 1956-10-30 Edward A Gaughler Ferritic alloys and methods of making and fabricating same
US2813789A (en) * 1952-04-08 1957-11-19 Glaser Louis Permanent magnet alloys
US2846494A (en) * 1955-11-30 1958-08-05 Rca Corp Thermoelectric devices
US3026197A (en) * 1959-02-20 1962-03-20 Westinghouse Electric Corp Grain-refined aluminum-iron alloys
US3085325A (en) * 1961-02-10 1963-04-16 Rca Corp Method of brazing
US3859079A (en) * 1972-08-09 1975-01-07 Bethlehem Steel Corp High temperature oxidation resistant alloy
US6607576B1 (en) * 1994-12-29 2003-08-19 Chrysalis Technologies Incorporated Oxidation, carburization and/or sulfidation resistant iron aluminide alloy

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813789A (en) * 1952-04-08 1957-11-19 Glaser Louis Permanent magnet alloys
US2768915A (en) * 1954-11-12 1956-10-30 Edward A Gaughler Ferritic alloys and methods of making and fabricating same
US2846494A (en) * 1955-11-30 1958-08-05 Rca Corp Thermoelectric devices
US3026197A (en) * 1959-02-20 1962-03-20 Westinghouse Electric Corp Grain-refined aluminum-iron alloys
US3085325A (en) * 1961-02-10 1963-04-16 Rca Corp Method of brazing
US3859079A (en) * 1972-08-09 1975-01-07 Bethlehem Steel Corp High temperature oxidation resistant alloy
US6607576B1 (en) * 1994-12-29 2003-08-19 Chrysalis Technologies Incorporated Oxidation, carburization and/or sulfidation resistant iron aluminide alloy

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