US2121606A - Coating for ferrous alloys - Google Patents

Coating for ferrous alloys Download PDF

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Publication number
US2121606A
US2121606A US93743A US9374336A US2121606A US 2121606 A US2121606 A US 2121606A US 93743 A US93743 A US 93743A US 9374336 A US9374336 A US 9374336A US 2121606 A US2121606 A US 2121606A
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coating
weight
parts
sheets
boric acid
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Expired - Lifetime
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US93743A
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Mcculloch Leon
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CBS Corp
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Westinghouse Electric and Manufacturing Co
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C04B28/105—Magnesium oxide or magnesium carbonate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C04B2111/00525—Coating or impregnation materials for metallic surfaces
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/90—Electrical properties
    • C04B2111/92—Electrically insulating materials

Definitions

  • This invention relates generally to coatings for The boric acid employed in the solution has of ferrous alloys and particularly to a coating for itself no binding or adhesive value, but when magnetic material. chemically reacted with magnesium oxide, the
  • An object of this invention is the provision of boric acid and magnesium oxide form a strong a lubricating and refractory coating for magadhesive film-forming substance somewhat simi- 5 netic material. lar to water glass, which is quite effective
  • Another object of this invention is the proviin maintaining the colloidal aluminum silicate sion of a coating for ferrous alloys which will on the surface of the sheets of magnetic matefunction as a die lubricant, a refractory, and an rial. Since the coating is often employed in coninsulating material.
  • the boric acid 10 Another object of this invention is the provi in the binder is of special value to the coating, sion of a coating for magnetic material which since it has been proven through experiments will not-cause deterioration of insulating liquids. that boric acid retards the deterioration of in- Other objects will become apparent from the sulating fluids, such as oil.
  • the coating employe'd comprises In electrical apparatus, such as transformers, 100 parts by weight of water, 1 to 100 parts by the magnetic material employed as the core memweight of the colloidal aluminum silicate, 1 to 10 hers is fabricated from ferrous alloys by rolling parts by Weight of boric acid, and magnesia in an ingot of the ferrous alloy to a predetermined an amount ranging from 1 to 100% of the weight thickness, shearing or punching the rolled maof the boric acid employed.
  • fabricating the magnealing temperature to which the coating .will netic material it is desired to provide a coating be subjected.
  • the refractory masteps, and as a refractory material between the terial, bentonite will substantially prevent the sheets to prevent the sheets from fusing together sticking'of the sheets of ferrous alloy.
  • bentonite coatings 1.to 50 parts by weight of Since the sheets of magnetic material are often bentonite gives a stifl mixture when employed in 30 employed in conjunction with an insulating liqthe solution within the ranges given hereinbefore uid, the lubricating andrefractory coating on and produces satisfactory results.
  • the sheets must not react with the insulating Where the coating is to be subjected to a high liquid to cause sludging or otherwise impair the annealing temperature, it is sometimes desirable insulating properties of the liquid.
  • insulating properties of the liquid In addition to employ kaolin as the refractory material in- 5 to these properties, it is desired that the coating stead of bentonite. This is because kaolin, being provide insulation for the sheets of magnetic a purer grade of colloidal aluminum silicate, is material to prevent eddy currents in the assemmore refractory than bentonite. In order to probled apparatus.
  • tion comprises a mixture of a colloidal aluminum of ka lin may b employed ith th b i acidsilicate of a clay-like nature, such as bentonite magnesium id l ti given h r i b or kaolin, in a solut on of b ric d an ma Suflicient magnesium oxide is employed in so- 45 nes um O d
  • the colloidal aluminum Silicate 1S lution with boric acid to render the solution a refractory material and when applied as a substantially neutral. This solution is a good coating n Sheets of ferrous alloy will prevent binding agent for the refractory materials.
  • the boric annealing temperat In Order to prevent the acid solution containing the refractory material 50 refractory material from flaking and blowing off may be easily dried leaving a glassy film on the of the sheets of ferrous material during the surface of the sheets.
  • This film functions as at annealing, the refractory material is carried in lubricant for the shears or dies employed in a binder comprising a solution of boric acid, magshearing or punching the sheets to the desired nesium oxide and water. size.
  • coating #100 contains 1.7 parts by weight of red oxide of iron.
  • the red oxide of iron is added to the solution in order to give a distinctive color to the coating.
  • the iron oxide also functions,
  • Red oxide of iron may or may not be added to the coating as desired.
  • a more refractory coating than the bentonite coatings listed above may be desired.
  • a kaolin coating comprising parts by weight of Georgia kaolin, 2 parts by weight of boric acid, .15 part by weight of magnesium oxide, and parts by weight of water is particularly satisfactory at the higher temperatures since it does not fuse,
  • a coating for ferrous alloys comprising from 1 to 100 parts by weight of a colloidal aluminum silicate selected from the group consisting of bentonite and kaolin in a solution consisting of about 100 parts by. weight of water, from 1 to 10 parts by weight of boric acid and magnesium oxide in an amount ranging from 1% to 100% of the weight of the boric acid.
  • a coating for ferrous alloys comprising from 1 to 100 parts by weight of kaolin in a solution consisting of about 100 parts by weight of water,
  • boric acid from 1 to 10 parts by w i ht of boric acid and magnesium oxide in an amount ranging from 1% to 100% of the weight of the boric acid.
  • a coating for ferrous alloys comprising from 1to50partsbyw l8htofbentoniteinasolution consisting of about 100 parts by weight of water, from 1 to 10 parts by .weight of boric acid and magnesium oxide in an amount ranging from 1% to 100% of the weight of the boric acid.
  • a coating for ferrous alloys comprising about 17 parts by weight of bentonite, about 5.75 parts by weight of boric acid, about 0.45 part by weight of magnesium oxide and about 100 parts by weight of water.
  • a coating for ferrom alhys comprising about80partsbyweightofholimabout2parts water.

Description

Patented June 21, 1938 2,121,606
UNITED STATES PATENT oFFrcr.
COATING FOR FERROUS ALLOYS Leon McCulloch, Pittsburgh, Pa", assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania No Drawing. Application July 31, 1936,
, Serial No. 93,743
Claims. (Cl. 134-44) This invention relates generally to coatings for The boric acid employed in the solution has of ferrous alloys and particularly to a coating for itself no binding or adhesive value, but when magnetic material. chemically reacted with magnesium oxide, the
An object of this invention is the provision of boric acid and magnesium oxide form a strong a lubricating and refractory coating for magadhesive film-forming substance somewhat simi- 5 netic material. lar to water glass, which is quite effective Another object of this invention is the proviin maintaining the colloidal aluminum silicate sion of a coating for ferrous alloys which will on the surface of the sheets of magnetic matefunction as a die lubricant, a refractory, and an rial. Since the coating is often employed in coninsulating material. junction with insulating liquids, the boric acid 10 Another object of this invention is the provi in the binder is of special value to the coating, sion of a coating for magnetic material which since it has been proven through experiments will not-cause deterioration of insulating liquids. that boric acid retards the deterioration of in- Other objects will become apparent from the sulating fluids, such as oil.
following description. In practice,.the coating employe'd comprises In electrical apparatus, such as transformers, 100 parts by weight of water, 1 to 100 parts by the magnetic material employed as the core memweight of the colloidal aluminum silicate, 1 to 10 hers is fabricated from ferrous alloys by rolling parts by Weight of boric acid, and magnesia in an ingot of the ferrous alloy to a predetermined an amount ranging from 1 to 100% of the weight thickness, shearing or punching the rolled maof the boric acid employed. The choice of the 20 terial into sheets of a desired size and then anamount of the colloidal aluminum silicate denealing the sheets of ferrous alloy to develop pends upon the material employed and the anits magnetic properties. In fabricating the magnealing temperature to which the coating .will netic material, it is desired to provide a coating be subjected.
on the surface of the alloy that will function Where low annealing temperatures of the or- 25 as a lubricant during the shearing or punching der of 725 C. are employed, the refractory masteps, and as a refractory material between the terial, bentonite, will substantially prevent the sheets to prevent the sheets from fusing together sticking'of the sheets of ferrous alloy. In the during the anneal. bentonite coatings, 1.to 50 parts by weight of Since the sheets of magnetic material are often bentonite gives a stifl mixture when employed in 30 employed in conjunction with an insulating liqthe solution within the ranges given hereinbefore uid, the lubricating andrefractory coating on and produces satisfactory results. the sheets must not react with the insulating Where the coating is to be subjected to a high liquid to cause sludging or otherwise impair the annealing temperature, it is sometimes desirable insulating properties of the liquid. In addition to employ kaolin as the refractory material in- 5 to these properties, it is desired that the coating stead of bentonite. This is because kaolin, being provide insulation for the sheets of magnetic a purer grade of colloidal aluminum silicate, is material to prevent eddy currents in the assemmore refractory than bentonite. In order to probled apparatus. duce a coating of the same constituency as when 40 In practicing this invention, a coating is probentonite is employed, it is necessary to employ 4o vided that will satisfy the requirements hereinmore of the kaolin than the bentonite with a before enumerated. The coating of this invengiven solution. As much as 100 parts by weight tion comprises a mixture of a colloidal aluminum of ka lin may b employed ith th b i acidsilicate of a clay-like nature, such as bentonite magnesium id l ti given h r i b or kaolin, in a solut on of b ric d an ma Suflicient magnesium oxide is employed in so- 45 nes um O d The colloidal aluminum Silicate 1S lution with boric acid to render the solution a refractory material and when applied as a substantially neutral. This solution is a good coating n Sheets of ferrous alloy will prevent binding agent for the refractory materials. When the sheets from sticking when subjected to an applied to the sheets of ferrous alloy, the boric annealing temperat In Order to prevent the acid solution containing the refractory material 50 refractory material from flaking and blowing off may be easily dried leaving a glassy film on the of the sheets of ferrous material during the surface of the sheets. This film functions as at annealing, the refractory material is carried in lubricant for the shears or dies employed in a binder comprising a solution of boric acid, magshearing or punching the sheets to the desired nesium oxide and water. size. The magnesium oxide in the coating, in '55- addition to reacting with the boric acid to make the solution neutral, further functions as a. refractory material.
Some of the preferred bentonite coatings are given in the following table:
Parts by weight Bentonite 17. 15 9. 6 8. Boric acid 5 8. Magnesium oxide .036 29 Water 100. 00 100. 00 Red oxide oi ir n 1. 7
In the above table, it is noted that coating #100 contains 1.7 parts by weight of red oxide of iron. The red oxide of iron is added to the solution in order to give a distinctive color to the coating. In addition to giving a particular color to the coating, the iron oxide also functions,
when the coating is applied to the sheets of ferrous alloy, as a refractory and aids in preventing the sheets from sticking during the anneaiing process. Red oxide of iron may or may not be added to the coating as desired.
Where the sheets of ferrous alloy are subjected to annealing temperatures of 1100 C, or higher, a more refractory coating than the bentonite coatings listed above may be desired. A kaolin coating comprising parts by weight of Georgia kaolin, 2 parts by weight of boric acid, .15 part by weight of magnesium oxide, and parts by weight of water is particularly satisfactory at the higher temperatures since it does not fuse,
but instead prevents the sheets from sticking for lubricating the shears during the shearing step in addition to acting as arefractory to prevent the sticking of the sheeiz. Under test, it is found that the film deposited on the sheet when the solution is evaporated provides sumcient insulation for preventing eddy currents. The coatings further do not cause deterioration of the insulating liquids with which they are employed.
Although this invention has been described with reference to a particular embodiment thereof, it is, of course, not to be limited thereto except insofar as is necessitated by the prior art and the scope of the appended claims.
I claim as my invention:
1. A coating for ferrous alloys comprising from 1 to 100 parts by weight of a colloidal aluminum silicate selected from the group consisting of bentonite and kaolin in a solution consisting of about 100 parts by. weight of water, from 1 to 10 parts by weight of boric acid and magnesium oxide in an amount ranging from 1% to 100% of the weight of the boric acid.
' 2. A coating for ferrous alloys comprising from 1 to 100 parts by weight of kaolin in a solution consisting of about 100 parts by weight of water,
from 1 to 10 parts by w i ht of boric acid and magnesium oxide in an amount ranging from 1% to 100% of the weight of the boric acid.
3. A coating for ferrous alloys comprising from 1to50partsbyw l8htofbentoniteinasolution consisting of about 100 parts by weight of water, from 1 to 10 parts by .weight of boric acid and magnesium oxide in an amount ranging from 1% to 100% of the weight of the boric acid.
4. A coating for ferrous alloys comprising about 17 parts by weight of bentonite, about 5.75 parts by weight of boric acid, about 0.45 part by weight of magnesium oxide and about 100 parts by weight of water. g
5. A coating for ferrom alhys comprising about80partsbyweightofholimabout2parts water.
LION llcOUILOCH.
US93743A 1936-07-31 1936-07-31 Coating for ferrous alloys Expired - Lifetime US2121606A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436708A (en) * 1948-02-24 Maurice marty
US2469473A (en) * 1943-08-02 1949-05-10 Gilron Products Company Method of lubricating metal surfaces during cold working
US2534406A (en) * 1944-09-22 1950-12-19 Jr Harry M Bramberry Coated metal article and method of making the same
US2704276A (en) * 1954-02-12 1955-03-15 Gulf Research Development Co Lubricating compositions
US2708379A (en) * 1950-02-07 1955-05-17 United States Steel Corp Method of hot rolling stainless steel
US2739085A (en) * 1953-03-13 1956-03-20 Westinghouse Electric Corp Insulating coatings for magnetic sheets
US3178322A (en) * 1961-03-30 1965-04-13 North American Aviation Inc Metal preheat-treat coating
US3265600A (en) * 1962-12-10 1966-08-09 United States Steel Corp Method of coating silicon steel in conjunction with box annealing thereof preparatory to die punching
US3350243A (en) * 1965-03-04 1967-10-31 Amchem Prod Method of and composition for controlling scale formation on ferriferous surfaces
US3475230A (en) * 1966-12-12 1969-10-28 Combustion Eng Descaling process and material
US3475231A (en) * 1966-12-28 1969-10-28 Combustion Eng Descaling process and material
US3858303A (en) * 1972-04-20 1975-01-07 Rolls Royce 1971 Ltd Method of brazing
US5693596A (en) * 1994-10-25 1997-12-02 Shin-Etsu Handotai Co., Ltd. Cutting fluid, method for production thereof, and method for cutting ingot

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436708A (en) * 1948-02-24 Maurice marty
US2469473A (en) * 1943-08-02 1949-05-10 Gilron Products Company Method of lubricating metal surfaces during cold working
US2534406A (en) * 1944-09-22 1950-12-19 Jr Harry M Bramberry Coated metal article and method of making the same
US2708379A (en) * 1950-02-07 1955-05-17 United States Steel Corp Method of hot rolling stainless steel
US2739085A (en) * 1953-03-13 1956-03-20 Westinghouse Electric Corp Insulating coatings for magnetic sheets
US2704276A (en) * 1954-02-12 1955-03-15 Gulf Research Development Co Lubricating compositions
US3178322A (en) * 1961-03-30 1965-04-13 North American Aviation Inc Metal preheat-treat coating
US3265600A (en) * 1962-12-10 1966-08-09 United States Steel Corp Method of coating silicon steel in conjunction with box annealing thereof preparatory to die punching
US3350243A (en) * 1965-03-04 1967-10-31 Amchem Prod Method of and composition for controlling scale formation on ferriferous surfaces
US3475230A (en) * 1966-12-12 1969-10-28 Combustion Eng Descaling process and material
US3475231A (en) * 1966-12-28 1969-10-28 Combustion Eng Descaling process and material
US3858303A (en) * 1972-04-20 1975-01-07 Rolls Royce 1971 Ltd Method of brazing
US5693596A (en) * 1994-10-25 1997-12-02 Shin-Etsu Handotai Co., Ltd. Cutting fluid, method for production thereof, and method for cutting ingot

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