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DE893600C - Process for the production of diffusion coatings - Google Patents

Process for the production of diffusion coatings

Info

Publication number
DE893600C
DE893600C DEK2844D DEK0002844D DE893600C DE 893600 C DE893600 C DE 893600C DE K2844 D DEK2844 D DE K2844D DE K0002844 D DEK0002844 D DE K0002844D DE 893600 C DE893600 C DE 893600C
Authority
DE
Germany
Prior art keywords
production
sintered
hard metals
objects
diffusion coatings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEK2844D
Other languages
German (de)
Inventor
Walter Dr Koch
Fritz Dr Phil Staeblein
Walter Dr Phil Tofaute
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aktiengesellschaft fuer Unternehmungen der Eisen und Stahlindustrie
Original Assignee
Aktiengesellschaft fuer Unternehmungen der Eisen und Stahlindustrie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aktiengesellschaft fuer Unternehmungen der Eisen und Stahlindustrie filed Critical Aktiengesellschaft fuer Unternehmungen der Eisen und Stahlindustrie
Priority to DEK2844D priority Critical patent/DE893600C/en
Application granted granted Critical
Publication of DE893600C publication Critical patent/DE893600C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

Verfahren zur Herstellung von Diffusionsüberzügen Zusatz zum Patent 880086 Es ist bekannt, daß die in der Hauptsache harte hochschmelzende Karbide, z. B. Wolframkarbid, Molybdänkarbid, Titankarbid, - Tantalkarbid, enthaltenden sogenannten gesinterten oder geschmolzenen Hartmetalle zwar eine große Dauerstandfestigkeit bzw. Warmfestigkeit, insbesondere auch bei, Temperaturen von über 800, C, aufweisen, daß ihre Zunderbeständigkeit jedoch zu wünschen übrigläßt. Die bei Eisen- und Stahllegierungen zur Erhöhung des Oxydationswiderstandes angewandten Verfahren und Maßnahmen sind erfahrungsgemäß in der Regel auf Hartmetalle nicht übertragbar und haben bisher keinen befriedigenden Verzunderungsschutz bei Hartmetallen gebracht. Es hat sich jedoch überraschenderweise gezeigt, daß das den Gegenstand des Patents 88o o86 bildende Verfahren, das der Herstellung von Diffusionsüberzügen, z. B. Chromüberzügen auf Metallgegenständen, insbesondere Gegenständen aus Eisen oder Stahl, dient und das darin besteht, daß homogene, sich nicht entmischende reine Chloridgase bei Unterdrucken von weniger als Soo mm Quecksilbersäule, insbesondere von 2o bis Zoo mm Quecksilbersäule, und bei erhöhten Temperaturen, insbesondere Temperaturen von 90o bis 110o° C, zur Anwendung gebracht werden, auch den gesinterten oder geschmolzenen Hartmetallen bei der Wahl eines geeigneten Überzuges, z. B. eines Chromüberzuges, einen vorzüglichen Schutz gegen Verzunderung bei hohen Temperaturen gewährt. Es wird somit durch die Anwendung des genannten Verfahrens auf Hartmetalle die Möglichkeit gegeben, Schaufeln von Abgasturbinen, Ventilsitze und ähnlich beanspruchte Teile von Verbrennungskraftmaschinen oder andere Gegenstände aus Hartmetall herzustellen und eine große Dauerstandfestigkeit bzw. Warmfestigkeit mit genügender Zunderbeständigkeit zu verbinden.Process for the production of diffusion coatings. Patent addendum 880086 It is known that the mainly hard refractory carbides, z. B. tungsten carbide, molybdenum carbide, titanium carbide, - tantalum carbide, containing so-called sintered or molten cemented carbides have a high fatigue strength or heat resistance, especially at temperatures of over 800 ° C, that their resistance to scaling leaves something to be desired. The one with iron and steel alloys procedures and measures are used to increase the resistance to oxidation Experience has shown that, as a rule, they are not transferable to hard metals and have so far been no satisfactory protection against scaling brought about by hard metals. It has but surprisingly shown that the subject of the patent 88o o86 forming Process used in the manufacture of diffusion coatings, e.g. B. chrome coatings Metal objects, especially objects made of iron or steel, and that consists in that homogeneous, non-segregating pure chloride gases at negative pressures of less than Soo mm of mercury, in particular from 2o to Zoo mm of mercury, and at elevated temperatures, especially temperatures from 90o to 110o ° C, also the sintered or molten ones Hard metals when choosing a suitable coating, e.g. B. a chrome coating, provides excellent protection against scaling at high temperatures. It thus the application of the above-mentioned method to hard metals makes it possible given, blades of exhaust gas turbines, valve seats and similarly stressed parts of internal combustion engines or other objects made of hard metal and a high creep strength or high temperature strength with sufficient resistance to scaling connect to.

Claims (1)

PATENTANSPRÜCHE: z. Anwendung des Verfahrens nach Patent SSo o86 auf Gegenstände aus gesinterten oder geschmolzenen Hartmetallen. -2. Anwendung nach Anspruch z auf Gegenstände aus gesinterten oder geschmolzenen Hartmetallen, die eine große Dauerstandfestigkeit bzw. Warmfestigkeit und gleichzeitig eine große Widerstandsfähigkeit-gegen Verzundern haben sollen, z. B. Schaufeln von Abgasturbinen, Ventilsitze und ähnlich beanspruchte Teile von Verbrennungskraftmaschinen oder anderen Gegenständen. PATENT CLAIMS: e.g. Application of the process according to patent SSo o86 to objects made of sintered or molten hard metals. -2. Application according to claim z to objects made of sintered or molten hard metals, which should have a high fatigue strength or high temperature strength and at the same time a high resistance to scaling, z. B. blades of exhaust gas turbines, valve seats and similarly stressed parts of internal combustion engines or other objects.
DEK2844D 1943-10-21 1943-10-21 Process for the production of diffusion coatings Expired DE893600C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK2844D DE893600C (en) 1943-10-21 1943-10-21 Process for the production of diffusion coatings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK2844D DE893600C (en) 1943-10-21 1943-10-21 Process for the production of diffusion coatings

Publications (1)

Publication Number Publication Date
DE893600C true DE893600C (en) 1953-10-19

Family

ID=7209621

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK2844D Expired DE893600C (en) 1943-10-21 1943-10-21 Process for the production of diffusion coatings

Country Status (1)

Country Link
DE (1) DE893600C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087871B (en) * 1955-03-21 1960-08-25 Diffusion Alloys Ltd Process for protecting metallic combustion chamber parts with beryllium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087871B (en) * 1955-03-21 1960-08-25 Diffusion Alloys Ltd Process for protecting metallic combustion chamber parts with beryllium

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