EP1180551B1 - Composé en vrac protégeant du durcissement pour la carburation sélective de pièces métalliques - Google Patents

Composé en vrac protégeant du durcissement pour la carburation sélective de pièces métalliques Download PDF

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Publication number
EP1180551B1
EP1180551B1 EP01117998A EP01117998A EP1180551B1 EP 1180551 B1 EP1180551 B1 EP 1180551B1 EP 01117998 A EP01117998 A EP 01117998A EP 01117998 A EP01117998 A EP 01117998A EP 1180551 B1 EP1180551 B1 EP 1180551B1
Authority
EP
European Patent Office
Prior art keywords
magnesium
compositions
weight
contain
protection against
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 - Lifetime
Application number
EP01117998A
Other languages
German (de)
English (en)
Other versions
EP1180551A2 (fr
EP1180551A3 (fr
Inventor
Stefan Dr. Wigger
Ulrich Dr. Baudis
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.)
Durferrit GmbH Thermotechnik
Original Assignee
Durferrit GmbH Thermotechnik
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 Durferrit GmbH Thermotechnik filed Critical Durferrit GmbH Thermotechnik
Publication of EP1180551A2 publication Critical patent/EP1180551A2/fr
Publication of EP1180551A3 publication Critical patent/EP1180551A3/fr
Application granted granted Critical
Publication of EP1180551B1 publication Critical patent/EP1180551B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/04—Treatment of selected surface areas, e.g. using masks

Definitions

  • the invention relates to hard coatings for the partial carburizing of metallic components.
  • the waterglass-based protective compositions hitherto used as an alternative in vacuum charcoal plants tend to embrittle and chip off during high-pressure gas quenching.
  • the plants are contaminated.
  • the heat exchangers can be covered with particles or bearings of the blower can be damaged, which can lead to system downtime
  • EP 0 867 524 A1 describes a method for covering metal surfaces during carburizing or nitriding, in which a mixture of a boron compound and silicon oxide, ie boron-glass-forming substances, is used as covering compound.
  • the covering compounds are applied in powder form with electrostatic coating methods on the metal parts.
  • the invention therefore relates to protective compounds based on boron-glass-forming substances for the partial carburization of metallic components, which are characterized in that they contain boron-glass-forming substances and additional magnesium-silicon compounds in a mass ratio of 2: 1 to 100: 1 1, and that they are formulated in liquid, semi-liquid or pasty consistency.
  • magnesium-silicon compounds according to the invention results in increased safety in gas carburizing against misinserted points due to running protective compound.
  • magnesium silicates such as magnesium orthosilicate (Mg 2 SiO 4 ), magnesium metasilicate (MgSiO 3 ), magnesium trisilicate (Mg 2 Si 3 O 8 ) and talc. Particularly preferred is magnesium trisilicate.
  • the hardness protection compositions according to the invention contain boron-glass-forming substances and magnesium-silicon compounds, typically in a mass ratio of 2: 1 to 100: 1.
  • a mass ratio of boron-glass-forming substances to magnesium-silicon compounds of 5: 1 to 15: 1 and in particular of about 10: 1 is preferred.
  • boron-forming substances contain the novel hardness protective compounds boric acid, boron oxide, alkali and / or Erdalkaliborate.
  • the hardness protection compositions according to the invention based on the total amount, 35-70 wt.% Of an organic binder system and are formulated in liquid, semi-liquid or pasty consistency. Suitable binder systems are known per se and familiar to the person skilled in the art and correspond to those used in hardness protection compounds hitherto used in practice.
  • Typical inventive hardness protection compositions contain, for example, 40-55% by weight of boron oxide, 3-6% by weight of magnesium trisilicate and 39-57% by weight of an organic binder system, in each case based on the total amount.
  • the hardness protection compositions according to the invention can be used very advantageously in processes for partially carburizing metallic components and are particularly suitable for vacuum carburization. Their use is completely in accordance with the known hardness protection compounds. In contrast to those, however, no running of the components, so that a proper and safe treatment is guaranteed. Nor do they cause contamination of the facilities.
  • Example 1 (according to the invention):
  • a protective composition of 50% by weight of boron oxide, 5% by weight of magnesium trisilicate and 45% by weight of an organic binder system was applied to a component at room temperature and stored for 10 days at elevated atmospheric humidity. Thereafter, the component was carburized at 930 ° C for 5 h to a case hardening depth (Eht) of 1.2 mm, quenched in oil and cleaned in an industrial washing machine.
  • Eht case hardening depth
  • a protective compound of 55% by weight of boron oxide and 45% by weight of an organic binder system was applied to a component at room temperature and stored for 10 days at elevated atmospheric humidity. Thereafter, the component at 930 ° C for 5 h carburized to a hardness of 1.2 mm, quenched in oil and cleaned in an industrial washing machine.
  • a protective composition of 50% by weight of boron oxide, 5% by weight of magnesium trisilicate and 45% by weight of an organic binder system was applied to a component at room temperature and dried at room temperature for 10 hours. Thereafter, the component was carburized in a vacuum carbonator to an Eht of 0.6 mm, quenched in a cold chamber and cleaned in an industrial washing machine.
  • a protective compound of 55 wt.% Boron oxide and 45 wt.% Of an organic binder system was at room temperature applied a component and dried for 10 hours at room temperature. Thereafter, the component was carburized in a vacuum carbonator to an Eht of 0.6 mm, quenched in a cold chamber and cleaned in an industrial washing machine.
  • a protective glass based on water glass was applied to a component at room temperature and dried for 10 hours at room temperature. Thereafter, the component was carburized in a vacuum carbonator to an Eht of 0.6 mm, quenched in a cold chamber and cleaned in an industrial washing machine.
  • the hardness in the covered area was 29-32 HRC, in the unprotected area 61-63 HRC.
  • the chipped residues of the protective mass were hard and only with great effort from the quenching chamber, in particular to remove from the heat exchangers. Due to the fate of these particles in the system, a shortening of the system runtime and deterioration of the function is to be expected.
  • the residues of the protective compound could not be washed off in the industrial washing machine. The component could only be cleaned by blasting with sand or glass beads.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Chemically Coating (AREA)
  • Paints Or Removers (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Lock And Its Accessories (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Glass Compositions (AREA)

Claims (8)

  1. Matières de protection contre le durcissement à base de substances formant du verre de bore, contenant de l'acide borique, de l'oxyde de bore, des borates alcalins et/ou alcalino-terreux, pour la carburation sélective de pièces métalliques, caractérisées en ce qu'elles contiennent des substances formant du verre de bore et en tant qu'additif des composés de magnésium-silicium selon un rapport de masse compris entre 2:1 et 100:1, et en ce qu'elles sont formulées selon une consistance fluide, semi-fluide ou pâteuse.
  2. Matières de protection contre le durcissement selon la revendication 1, caractérisées en ce qu'elles contiennent des substances formant du verre de bore et des composés de magnésium-silicium selon un rapport de masse compris entre 5:1 et 15:1, de préférence selon un rapport de masse environ égal à 10:1.
  3. Matières de protection contre le durcissement selon les revendications 1 ou 2, caractérisées en ce qu'elles contiennent en tant que composés de magnésium-silicium des silicates de magnésium, tel qu'en particulier de l'orthosilicate de magnésium (Mg2SiO4), du métasilicate de magnésium (MgSiO3), du trisilicate de magnésium (Mg2Si3O8) et du talc.
  4. Matières de protection contre le durcissement selon les revendications 1 à 3, caractérisées en ce qu'elles contiennent en tant que composé de magnésium-silicium du trisilicate de magnésium.
  5. Matières de protection contre le durcissement selon les revendications 1 à 4, caractérisées en ce qu'elles contiennent, sur la base de la quantité totale, 35 à 70 % en masse d'un système de liant organique.
  6. Matières de protection contre le durcissement selon la revendication 5, caractérisées en ce qu'elles contiennent, sur la base de la quantité totale, 40 à 55 % en masse d'oxyde de bore, 3 à 6 % en masse de trisilicate de magnésium et 39 à 57 % en masse d'un système de liant organique.
  7. Matières de protection contre le durcissement selon la revendication 5 ou 6, caractérisées en ce qu'elles contiennent, sur la base de la quantité totale, 45 % en masse d'oxyde de bore, 5 % en masse de trisilicate de magnésium et 50 % en masse d'un système de liant organique.
  8. Utilisation des matières de protection contre le durcissement selon les revendications 1 à 7 dans un procédé de carburation sélective de pièces métalliques.
EP01117998A 2000-08-07 2001-07-25 Composé en vrac protégeant du durcissement pour la carburation sélective de pièces métalliques Expired - Lifetime EP1180551B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10038447 2000-08-07
DE10038447A DE10038447C1 (de) 2000-08-07 2000-08-07 Abdeckmassen für das partielle Aufkohlen von metallischen Bauteilen

Publications (3)

Publication Number Publication Date
EP1180551A2 EP1180551A2 (fr) 2002-02-20
EP1180551A3 EP1180551A3 (fr) 2006-05-03
EP1180551B1 true EP1180551B1 (fr) 2010-01-06

Family

ID=7651565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01117998A Expired - Lifetime EP1180551B1 (fr) 2000-08-07 2001-07-25 Composé en vrac protégeant du durcissement pour la carburation sélective de pièces métalliques

Country Status (9)

Country Link
US (1) US6964712B2 (fr)
EP (1) EP1180551B1 (fr)
JP (1) JP4938186B2 (fr)
AT (1) ATE454482T1 (fr)
BR (1) BR0103204B1 (fr)
CA (1) CA2354675C (fr)
DE (2) DE10038447C1 (fr)
ES (1) ES2338094T3 (fr)
PL (1) PL198128B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8173221B2 (en) * 2008-03-18 2012-05-08 MCT Research & Development Protective coatings for metals
DE102011012333A1 (de) 2011-02-24 2012-08-30 DAM Härtetechnik Gmbh Härteschutzmittel für das partielle Härten von metallischen Werkstücken
DE102016214645A1 (de) * 2016-08-08 2018-02-08 Schaeffler Technologies AG & Co. KG Lagerschale für ein Halbschalenlager, sowie Halbschalenlager und dessen Verwendung
JP7019418B2 (ja) * 2017-12-28 2022-02-15 勝規 瀬川 耐熱性塗料

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US3151002A (en) 1959-09-26 1964-09-29 Zahnradfabrik Friedrichshafen Methods of selective carburization of ferrous metal surfaces and materials therefor
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FR2423536A1 (fr) * 1978-04-17 1979-11-16 Interox Compositions et procede pour le lavage et le blanchiment
EP0419675B1 (fr) * 1989-04-01 1999-03-17 Kabushiki Kaisha Nard Kenkyusho Procede pour empecher la cementation ou la nitruration et masque pour empecher la cementattion, la nitruration ou l'oxydation
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Also Published As

Publication number Publication date
PL349061A1 (en) 2002-02-11
US20020020471A1 (en) 2002-02-21
ATE454482T1 (de) 2010-01-15
JP2002115041A (ja) 2002-04-19
US6964712B2 (en) 2005-11-15
JP4938186B2 (ja) 2012-05-23
EP1180551A2 (fr) 2002-02-20
CA2354675A1 (fr) 2002-02-07
ES2338094T3 (es) 2010-05-04
DE50115294D1 (de) 2010-02-25
PL198128B1 (pl) 2008-05-30
CA2354675C (fr) 2009-06-23
BR0103204A (pt) 2002-03-26
EP1180551A3 (fr) 2006-05-03
DE10038447C1 (de) 2002-07-11
BR0103204B1 (pt) 2011-09-06

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