US1060509A - Process for the manufacture of aluminium nitrid. - Google Patents

Process for the manufacture of aluminium nitrid. Download PDF

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Publication number
US1060509A
US1060509A US69572312A US1912695723A US1060509A US 1060509 A US1060509 A US 1060509A US 69572312 A US69572312 A US 69572312A US 1912695723 A US1912695723 A US 1912695723A US 1060509 A US1060509 A US 1060509A
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nitrid
manufacture
resistance
aluminium
furnace
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US69572312A
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Ottokar Serpek
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SGN
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
    • C01B21/072—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with aluminium
    • C01B21/0726—Preparation by carboreductive nitridation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer

Definitions

  • aluminium nitrid is mans ufactured by heating alumina (or substances containing it) mixed with carbon in a current of nitrogen. But although revolving furnaces have given very good results working on a large scale, it appears that it would be advantageous in working on a small scale to be able to carry out the manufacture of the -nitrid in stationary furnaces the construction of which demands little expense.
  • the .bbje'ct of the present invention is a recess allowing of carrying out this manuacture of the nitrid equally well in stationary furnaces.
  • an electrical resistance furnace for this purpose, there is employed an electrical resistance furnace, the resistance being brought to the desired terplperature by an electric current.
  • itrogen is supplied to the substances heated in such a manner that there are formed cavities around the electrode during the reaction.
  • This result is obtained either by directly introducing nitrogen through the e ectrical resistance and allowing it to escape at'the points where it is more particularly desired to obtain the cavities, or by passing transversely of the mass tubes leading to the immediate neighborhood of the resistance in order to allow the nitrogen to escape at this point.
  • agglomeration of the nitrid against the resistance is avoided. Since the latter is a very good insulator of heat, without this precaution the radiating effect of the resistance would decrease rapidly to a large extent. This cavity presents moreover the great. advantage of allowing the introduction of fresh material.
  • This fresh material introduced arrives in this way directly in the hottest zone which is itself protected externally against losses of heat by the thicl r layer of nitrid formedfso that-the conversion into nitrid of the mixture introduced takes place very rapidly.
  • the furnace A is vertical. At the center,
  • a heatin resistance B is arranged between mixture E is converted into aluminium nitrid.
  • Tubes G G allow of recharging into the furnace at certain'quantity of the mix.
  • openings H upon its periphery. After having removed the plugs H closing the openings, the unagglomeratedv mixture E obstructing them is removed, the crust- E mice heating, said process consisting insupname to this specification, in the presence of 1'i ⁇ lgf11i%0g811 in the iminefliiatfi niiighbortwo subscribing Witnesses.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Description

APPLIUATION FILED MAY], 1912.
Patented Apr. 29, 1913.
' m'messss INVENTOK cam; sra'rs rarer rare ,OTTOKAR SER-PEK, OF PARIS, FRANCE, ASSIGNOR TO SOCIETE GENEBALE.DES NITRURES, OF PARIS, FRANCE.
PROCESS FOR THE MANUFACTURE OF ALUMINIUM NITRID.
Specification of Letters Patent.
Patented Apr. 29, 191 3.
Application filed May 7, 1912. Serial No. 695,723.
Process for the Manufacture of Aluminium Nitrid, of which the following is a specification. I
It is known that aluminium nitrid is mans ufactured by heating alumina (or substances containing it) mixed with carbon in a current of nitrogen. But although revolving furnaces have given very good results working on a large scale, it appears that it would be advantageous in working on a small scale to be able to carry out the manufacture of the -nitrid in stationary furnaces the construction of which demands little expense.
The .bbje'ct of the present invention is a recess allowing of carrying out this manuacture of the nitrid equally well in stationary furnaces. For this purpose, there is employed an electrical resistance furnace, the resistance being brought to the desired terplperature by an electric current.
itrogen is supplied to the substances heated in such a manner that there are formed cavities around the electrode during the reaction. This result is obtained either by directly introducing nitrogen through the e ectrical resistance and allowing it to escape at'the points where it is more particularly desired to obtain the cavities, or by passing transversely of the mass tubes leading to the immediate neighborhood of the resistance in order to allow the nitrogen to escape at this point. Owing to this arrangement, agglomeration of the nitrid against the resistance is avoided. Since the latter is a very good insulator of heat, without this precaution the radiating effect of the resistance would decrease rapidly to a large extent. This cavity presents moreover the great. advantage of allowing the introduction of fresh material. This fresh material introduced arrives in this way directly in the hottest zone which is itself protected externally against losses of heat by the thicl r layer of nitrid formedfso that-the conversion into nitrid of the mixture introduced takes place very rapidly. This method of workingincreases considerably the efficiency of the 0poration in the electrical furnace, not only as regards the absolute quantity of nitrid produced per operation, but also as regards the weight of nitrogen fixed per kilowatthour.
By way of example, there is shown in vertical section in the annexed drawing a furnace allowing the carrying out of this process.
The furnace A is vertical. At the center,
a heatin resistance B is arranged between mixture E is converted into aluminium nitrid. Tubes G G allow of recharging into the furnace at certain'quantity of the mix.-
ture. I
Instead of using tubes G for recharging the furnace at the top, there may be arranged openings H upon its periphery. After having removed the plugs H closing the openings, the unagglomeratedv mixture E obstructing them is removed, the crust- E mice heating, said process consisting insupname to this specification, in the presence of 1'i{lgf11i%0g811 in the iminefliiatfi niiighbortwo subscribing Witnesses.
00c 0 t e resistance ant t ere y orming i a cavity between the resistance and the ni- OTTOKAR SERPEK' 5 trid produced and supplying the mixture to said cavity.
In testimony whereof, I have. signed my Witnesses:
H. 0. Com,
LEON PEILLET.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,-
Washington, I). 0.
US69572312A 1912-05-07 1912-05-07 Process for the manufacture of aluminium nitrid. Expired - Lifetime US1060509A (en)

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US69572312A US1060509A (en) 1912-05-07 1912-05-07 Process for the manufacture of aluminium nitrid.

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US69572312A US1060509A (en) 1912-05-07 1912-05-07 Process for the manufacture of aluminium nitrid.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922213A (en) * 1955-01-05 1960-01-26 Pechiney Prod Chimiques Sa Process for agglomerating aluminum nitride and resultant product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922213A (en) * 1955-01-05 1960-01-26 Pechiney Prod Chimiques Sa Process for agglomerating aluminum nitride and resultant product

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