EP0083842B1 - Elément en métal dur revêtu et procédé de sa fabrication - Google Patents

Elément en métal dur revêtu et procédé de sa fabrication Download PDF

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Publication number
EP0083842B1
EP0083842B1 EP19820306473 EP82306473A EP0083842B1 EP 0083842 B1 EP0083842 B1 EP 0083842B1 EP 19820306473 EP19820306473 EP 19820306473 EP 82306473 A EP82306473 A EP 82306473A EP 0083842 B1 EP0083842 B1 EP 0083842B1
Authority
EP
European Patent Office
Prior art keywords
substrate
coating
bonding layer
carbide
layer
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
EP19820306473
Other languages
German (de)
English (en)
Other versions
EP0083842A1 (fr
Inventor
Thomas Eugene Hale
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.)
Carboloy Inc
Original Assignee
Carboloy Inc
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
Priority claimed from US06/331,368 external-priority patent/US4490191A/en
Application filed by Carboloy Inc filed Critical Carboloy Inc
Priority to AT82306473T priority Critical patent/ATE44551T1/de
Publication of EP0083842A1 publication Critical patent/EP0083842A1/fr
Application granted granted Critical
Publication of EP0083842B1 publication Critical patent/EP0083842B1/fr
Expired 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
    • 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

Definitions

  • This invention relates to coated articles comprising hard metals, refractories, and especially cemented carbide substrates. More particularly, it relates to such coated hard metal or coated cemented carbide products which are adapted to receive an aluminum oxide or other oxide wear layer which is very firmly bonded to the substrate.
  • Such hard metal and/or cemented carbide substrates are used in tools for machining and cutting metals. Their already high wear resistance can be significantly improved by providing oxide wear layers, such as aluminum oxide wear layers, as described in U.S. 3,736,107 and 3,836,392. However, it has become apparent that proper steps must be taken to adequately bond the oxide layer to the hard metal or cemented carbide substrate if the superior wear resistance of the oxide layer is to be realized.
  • a novel coating procedure has now been discovered which provides aluminum oxide and other oxides (e.g., hafnium oxide, zirconium oxide and the like) bonded to the substrates with adherence equal to that obtained in the said '631 patent, which can be performed at normal coating temperatures.
  • aluminum oxide and other oxides e.g., hafnium oxide, zirconium oxide and the like
  • the present bonding layer is thin, not useful as a barrier, and possesses a composition novel in its chemical constituents. All of the foregoing patents and publications are incorporated herein by reference.
  • an article for cutting and wear parts comprising:
  • the present invention also provides a process of pretreating a hard metal or cemented carbide substrate for the reception of wear resistant oxide coatings which comprises:
  • the substrate is a cobalt cemented carbide; the bonding layer is 0.1 to 0.5 pm thick; the oxide wear layer is aluminium oxide; and the wear layer is 0.5 to 20 pm thick.
  • a hard metal or cemented carbide substrate is precoated with a layer comprising a carbide, nitride or carbonitride of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Si or B to form an intermediate layer, the preferred layer being TiC.
  • the substrate is then treated in a first atmosphere selected from carbide and oxycarbide forming atmospheres to form a bonding layer of a metal selected from at least one of tantalum, niobium or vanadium on said coated substrate and heating the coated substrate in a second oxidizing atmosphere until at least about 50% of the surface is oxidized.
  • Aluminium is added to the bonding layer; and an oxide outer wear layer, preferably an aluminium oxide wear layer, will be deposited on the bonding layer.
  • One convenient way of proceeding is to provide a coating furnace held at a temperature of from about 800°C to 1300°C, and to expose a precoated substrate of the process of step (a) in the furnace to the following sequential steps.
  • a commercial cemented carbide cutting tool insert of composition 85.5% WC, 6% TaC, 2.5% TiC and 6% Co was coated in the following manner:
  • the coated insert was used to machine cast iron at 122.1 surface metres per minute, 0.025 mm/rev. feed rate, and the wear resistance was compared with that obtained using a commercial insert which requires a high temperature diffusion operation to make the coating.
  • a cemented carbide insert having the same composition as Example 1 above was coated with Al 2 O 3 in the following manner:
  • the resultant coated insert had a 3 ⁇ m Al 2 O 3 coating firmly bonded to the cemented carbide substrate, through a bonding layer about 0.2 pm thick attached to a carbide layer formed from the niobium and titanium and carbon from the substrate.
  • a cemented carbide insert having the same composition as Example 1 above was pretreated then coated with Al 2 O 3 in the following manner at a furnace temperature of 1050°C, and 10 5 Pa (1 atmosphere) pressure.
  • Steps 1 to 3 produce a carbide and bonding layer.
  • the resultant coated insert had a 3-4 ⁇ m A 2 l 2 O 3 coating firmly bonded to the cemented carbide substrate, through a bonding layer about 0.2 ⁇ m thick.
  • Steps 1 to 3 produce a carbide and a bonding layer, the carbon being derived from the substrate.
  • a coated insert according to this invention was obtained.
  • a commercial cemented carbide cutting tool insert comprising 85.5% WC, 6% TaC 2.5% TiC and 6% Co and coated with TiC of five ⁇ m thickness is subjected to the following sequence of steps in a furnace at temperature of 1050°C and 10 5 Pa (1 atmosphere) pressure:

Landscapes

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

Claims (4)

1. Article pour élément de coupe et d'usure, comprenant:
(i) un substrat en métal dur ou carbure cémenté;
(ii) un premier revêtement, sur ce substrat, en un carbure, nitrure ou carboniture de titane, zirconium, hafnium, vanadium, niobium, tantale, chrome, molybdène, tungstène silicium ou bore;
(iii) une couche de liaison, fixée audit premier revêtement, cette couche de liaison étant une couche de liaison oxydée en surface et comprenant au moins un des carbures ou oxycarbures de tantale, niobium, et vanadium, et comprenant de l'aluminium, ladite couche de liaison étant capable d'accepter, de façon adhésive, une couche d'usure en oxyde, à des températures de revêtement de 800° à 1300°C; et
(iv) une couche d'usure en oxyde, superposée à ladite couche de liaison.
2. Article tel que revendiqué dans la revendication 1, dans lequel ledit premier revêtement comprend TiC.
3. Procédé de prétraitment d'un substrat en métal dur ou carbure cémenté, pour la réception de revêtements en oxyde, résistants, à l'usure, qui comprend:
(a) l'application d'un premier revêtement, sur le substrat, en carbure, nitrure ou carbonitrure de titane, zirconium, hafnium, vanadium, niobium, tantale, chrome, molybdène, tungstène, silicium ou bore;
(b) le traitement du substrat revêtu dans une première atmosphère, choisi parmi les atmosphères formant des carbures et des oxycarbures, pour former une couche de liaison en un carbure ou oxycarbure d'un métal choisi parmi au moins un des tantale, niobium et vanadium, sur ledit substrat revêtu;
(c) le chauffage du substrat revêtu provenant de (b) à une température de 800° à 1300° dans une autre atmosphère oxydante, jusqu'à ce qu'au moins des parties de la surface soient oxydées; et
(d) le traitement du substrat revêtu oxydé provenant de (c) dans une atmosphère réductrice avec un composé réductible de l'aluminium, pour faire diffuser l'aluminium dans le revêtement.
4. Procédé tel que revendiqué dans la revendication 3, comprenant l'étape de superposition d'une couche d'usure en oxyde sur le substrat revêtu oxydé en surface et contenant de l'aluminium.
EP19820306473 1981-12-16 1982-12-06 Elément en métal dur revêtu et procédé de sa fabrication Expired EP0083842B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82306473T ATE44551T1 (de) 1981-12-16 1982-12-06 Beschichteter hartmetallkoerper und verfahren zu seiner herstellung.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US33136781A 1981-12-16 1981-12-16
US06/331,368 US4490191A (en) 1981-12-16 1981-12-16 Coated product and process
US331367 1981-12-16
US331368 1981-12-16

Publications (2)

Publication Number Publication Date
EP0083842A1 EP0083842A1 (fr) 1983-07-20
EP0083842B1 true EP0083842B1 (fr) 1989-07-12

Family

ID=26987728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820306473 Expired EP0083842B1 (fr) 1981-12-16 1982-12-06 Elément en métal dur revêtu et procédé de sa fabrication

Country Status (3)

Country Link
EP (1) EP0083842B1 (fr)
CA (1) CA1198945A (fr)
DE (1) DE3279814D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6039408U (ja) * 1983-08-24 1985-03-19 三菱マテリアル株式会社 一部非研削超硬ドリル
AT385947B (de) * 1983-12-22 1988-06-10 Ver Edelstahlwerke Ag Hartmetallkoerper, insbesondere hartmetall-schneidwerkzeug
AT387186B (de) * 1987-05-04 1988-12-12 Ver Edelstahlwerke Ag Beschichteter hartmetallkoerper
SE464818B (sv) * 1989-06-16 1991-06-17 Sandvik Ab Belagt skaer foer skaerande bearbetning
US5372873A (en) * 1992-10-22 1994-12-13 Mitsubishi Materials Corporation Multilayer coated hard alloy cutting tool
JP2746036B2 (ja) * 1992-12-22 1998-04-28 三菱マテリアル株式会社 表面被覆切削工具
US6071601A (en) * 1997-05-12 2000-06-06 Mitsubishi Materials Corporation Coated cutting tool member

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29420E (en) * 1971-11-12 1977-09-27 Sandvik Aktiebolag Sintered cemented carbide body coated with two layers
DE2525185C3 (de) * 1975-06-06 1986-04-17 Fried. Krupp Gmbh, 4300 Essen Hartmetallkörper
US4018631A (en) * 1975-06-12 1977-04-19 General Electric Company Coated cemented carbide product
EP0032887B1 (fr) * 1980-01-21 1986-07-23 Sandvik Aktiebolag Procédé pour la fabrication d'un produit en carbure aggloméré ayant un revêtement, et produit ainsi obtenu

Also Published As

Publication number Publication date
EP0083842A1 (fr) 1983-07-20
CA1198945A (fr) 1986-01-07
DE3279814D1 (en) 1989-08-17

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