EP0554683A1 - Procédé pour changer la surface des produits coulés par imprégnation de poudre - Google Patents

Procédé pour changer la surface des produits coulés par imprégnation de poudre Download PDF

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Publication number
EP0554683A1
EP0554683A1 EP93100455A EP93100455A EP0554683A1 EP 0554683 A1 EP0554683 A1 EP 0554683A1 EP 93100455 A EP93100455 A EP 93100455A EP 93100455 A EP93100455 A EP 93100455A EP 0554683 A1 EP0554683 A1 EP 0554683A1
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EP
European Patent Office
Prior art keywords
wear
metal
casting
hard
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.)
Withdrawn
Application number
EP93100455A
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German (de)
English (en)
Inventor
Gopal Subray Revankar
Daniel Lee Deroo
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP0554683A1 publication Critical patent/EP0554683A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal

Definitions

  • the invention relates to a method for impregnating or embedding hard, wear-resistant phases in surface layers of metal products which are produced by pouring liquid metal.
  • metal products for example made of iron
  • the surfaces are coated, for example, by flame spray coating or plasma spray coating.
  • flame spray coating or plasma spray coating a disadvantage of these processes is that the surface layers can flake off during the coating process and when the products are used. There are also high procedural costs.
  • the mechanical properties of cast iron made by an EPC process are inferior to that of sand or core castings due to the presence of carbon defects. Furthermore, the EPC process requires special precautionary measures to keep small changes in shape during casting.
  • the EPC process in a conventional foundry requires the installation of special devices.
  • the cast products can have shape deviations which can be attributed to shape deviations of the foam models.
  • the sand molding method for casting carbides known from the prior art requires carbide balls, which can make the process more expensive. Increased costs can also result from the requirement that the wear-resistant surface be formed flat. In this case, the cast product must be smoothed and a surface layer removed, which corresponds approximately to half the diameter of the spherical particles.
  • the invention remedies this and proposes a method for embedding hard, wear-resistant phases in surface layers of metal products which are produced by pouring liquid metal into casting molds.
  • a flowable mass which contains wear-resistant material, is shaped in such a way that a disc or layer is formed with preferably a series of pegs, projections, spikes or the like. This layer is sintered and adhered to a surface of the mold before the metal is cast.
  • the projections result in a better bond between the wear-resistant material and the cast one Metal than is the case when using spherical sintered carbide particles.
  • the present invention can basically be applied to the casting of any known metal through which a carbide surface can be wetted.
  • Metals that can be used are, for example, iron, aluminum and the like.
  • Cast iron, especially spheroidal graphite cast iron or gray cast iron is preferred for the most common wear-resistant carbide types, such as, for example, chromium carbide and the like.
  • a first step involves forming a thin sheet or plate that contains wear-resistant material.
  • the invention can be successfully applied with any hard phase known from the prior art, for example with carbides such as tungsten carbide and chromium carbide or with aluminum compounds and the like.
  • the hard phases can be replaced by powder of any metal, an intermetallic compound or a ceramic material, which is determined by the matrix material (embedding material) used, such as. B. wetting iron or an alloy known from the prior art.
  • aluminum can be used to improve the surface wear resistance of cast iron or nickel by forming intermetallic aluminum compounds. Suitable materials such as nickel or iron can also be used in aluminum casting.
  • the wear-resistant material can be a metallic binder, e.g. B. from the iron group, preferably cobalt for the use of tungsten carbides or nickel for the use of chromium carbides, etc., included.
  • a metallic binder e.g. B. from the iron group
  • cobalt for the use of tungsten carbides or nickel for the use of chromium carbides, etc.
  • particles containing tungsten carbide with a weight fraction of 14 to 17% cobalt are preferred for the casting of ductile iron.
  • the size of the particles is not critical in the practice of the present invention, it becomes fine-grained Particles preferred which have a mesh size of 140/325 (approx. 110 to 50 microns) or finer.
  • the thin plate is produced by mixing a powder of hard, wear-resistant material with a suitable organic binder, for example a 10% polyvinyl alcohol solution, and a suitable hardener, for example 2-ethylhexyl diphenyl phosphate, phosphate ester hardener (e.g. KRONITEX 3600 from FMC Corporation, USA) or a mixture of these hardeners.
  • a suitable organic binder for example a 10% polyvinyl alcohol solution
  • a suitable hardener for example 2-ethylhexyl diphenyl phosphate, phosphate ester hardener (e.g. KRONITEX 3600 from FMC Corporation, USA) or a mixture of these hardeners.
  • the mixture forms a flowable mass with suitable rheological properties so that the mass can be brought into the form of a disk or plate.
  • any hardener and / or organic binder that can be processed effectively with a certain hard, wear-resistant material is suitable for carrying out the invention.
  • a pattern is formed on an outwardly facing surface of the thin plate, which has a structure that allows an improvement in the impregnation of the iron.
  • Any pattern shape that has at least a peg, a peg, a protrusion, or the like that prevents lateral movement of the thin plate during casting is suitable.
  • a hexagonal or waffle-shaped structure can be applied to the surface of the thin plate (FIG. 1).
  • Other suitable patterns include circular, elliptical and similar structures.
  • the pegs can take any conceivable shape that gives a desired contour to keep the distance of metal penetration small during casting.
  • the pattern can be molded by suitable means, for example by using a stamp with the desired pattern is pressed onto the surface of the still flowable, plastic, thin plate.
  • the thin plate is then dried, for example in an oven at 100 ° C., until it forms a dimensionally stable body.
  • the thin plate is then sintered under suitable conditions so that on the one hand it achieves sufficient porosity and on the other hand it is stable enough to withstand further processing and / or the use of further process steps.
  • suitable conditions include a 300 to 360 minute vacuum sintering process at about 1200 to 1250 ° C.
  • the sintered thin plate described above consists of a porous sinter mixture with partial densifications (Fig. 2).
  • This partially or sintered thin plate can now be fastened in a known manner on a suitable mold surface, for example on a cast core, so that the patterned surface comes into contact with the cast core.
  • a suitable mold surface for example on a cast core
  • a high-temperature carbon is used here according to an embodiment of the invention.
  • the layer is then z. B. heated in an oven to 100 ° C so that the volatile constituents are expelled from the adhesive and the adhesive cures.
  • the high temperature adhesive must have a flow temperature that is higher than the casting temperature of the metal.
  • any adhesive in this regard is suitable, but an inorganic high-temperature adhesive is particularly preferred.
  • a binder which contains a high-temperature ceramic adhesive, e.g. B. a high temperature binder, which is available from Aremco Products, Inc., USA under the trade name Ceramabond 569 is sold and contains, for example, oxides of aluminum, silicon and potassium in an aqueous colloidal suspension which has a maximum service temperature of approximately 1650 ° C.
  • the liquid metal flows around the layer of hard, wear-resistant material, whereby any of the known casting methods, for example gravity casting, pressure die casting, vacuum casting or the like, can be used.
  • gravity-based casting is preferred because of its ease of handling.
  • the wear-resistant material partially dissolves in the casting metal and separates there as an integral part.
  • chrome carbide partially dissolves in molten iron and solidifies again there.
  • the microstructure of such a composite is shown in Fig. 3, which also shows that the composite is bonded to the iron substrate in such a way that it cannot be easily detached therefrom.
  • Fig. 4 shows the ground surface of a composite in which the iron "network" surrounding the composite spigot is clearly visible.
  • the method according to the invention can be used to produce metal products which cover a wide range of applications.
  • the method can also be used with a large number of metals and their alloys.
  • the surface conversion can already be carried out successfully during the casting process and requires neither subsequent soldering or welding, nor additional casting devices, such as may be associated with a dissolving foam core (EPC process) during casting.
  • the process according to the invention can be used without difficulty in known sand molding processes.
  • a fine chrome carbide powder (mesh size 140/325 or finer) is mixed with a 10% aqueous solution of polyvinyl alcohol and 2-ethylhexyl diphenyl phosphate or KRONITEX 3600 to form a flowable mass with adequate rheological properties, which form slices or thin Drain or roll out the plates.
  • a pattern with a hexagonal structure is then embossed on the plate, as shown in FIG. 1.
  • the thin plate is then dried in an oven in air at 100 ° C. and then sintered in a vacuum at 1200 to 1250 ° C. for 300 to 360 minutes.
  • the carbide plate is attached to a sand core with the Ceramabond 569 adhesive from Aremco.
  • the sand core and the carbide plate are tempered in an oven at 100 ° C. for 60 to 120 minutes in order to drive volatile constituents out of the binder and to set the adhesive. Now it will liquid iron is poured around the carbide plate by means of a conventional casting process, so that the metal plate solidifies the carbide plate with the metal surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Ceramic Products (AREA)
  • Forging (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP93100455A 1992-01-21 1993-01-14 Procédé pour changer la surface des produits coulés par imprégnation de poudre Withdrawn EP0554683A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US822903 1992-01-21
US07/822,903 US5299620A (en) 1992-01-21 1992-01-21 Metal casting surface modification by powder impregnation

Publications (1)

Publication Number Publication Date
EP0554683A1 true EP0554683A1 (fr) 1993-08-11

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ID=25237294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93100455A Withdrawn EP0554683A1 (fr) 1992-01-21 1993-01-14 Procédé pour changer la surface des produits coulés par imprégnation de poudre

Country Status (5)

Country Link
US (1) US5299620A (fr)
EP (1) EP0554683A1 (fr)
JP (1) JPH05318085A (fr)
CA (1) CA2086873A1 (fr)
MX (1) MX9300274A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001520A1 (fr) * 1993-07-02 1995-01-12 Knorr-Bremse Ag Disque de frein pour freins a disque
EP0687829A1 (fr) * 1994-06-17 1995-12-20 Wagner Electric Corporation Matériau de friction renforcé
CN1053020C (zh) * 1994-12-30 2000-05-31 邵天敏 一种铝及铝合金表面的涂层制备方法
DE4418750C2 (de) * 1994-05-28 2000-06-15 Vaw Ver Aluminium Werke Ag Verfahren zur Herstellung von verschleißfesten Oberflächen auf Formgußteilen
CN104707972A (zh) * 2015-02-15 2015-06-17 广东省工业技术研究院(广州有色金属研究院) 一种复合耐磨件的制备方法

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* Cited by examiner, † Cited by third party
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AR007698A1 (es) * 1996-08-28 1999-11-10 Deere & Co Metodo para aportar dureza superficial a una superficie metalica y un lodo preparado por dicho metodo
US5921333A (en) * 1997-08-06 1999-07-13 Naco, Inc. Casting having in-situ cast inserts and method of manufacturing
US9138805B2 (en) 2002-03-06 2015-09-22 Deere & Company Method for applying wear resistant coating to mechanical face seal
US9616951B2 (en) 2002-03-06 2017-04-11 Deere & Company Non-carburized components of track-type machines having a metallurgically bonded coating
US8684475B2 (en) * 2002-03-06 2014-04-01 Deere & Company Components of track-type machines having a metallurgically bonded coating
US6948784B2 (en) 2002-03-06 2005-09-27 Deere & Company Track pin bushing having a metallurgically bonded coating
US7163754B2 (en) * 2003-10-23 2007-01-16 Deere & Company Sprocket wheel having a metallurgically bonded coating and method for producing same
CN1318629C (zh) * 2005-09-05 2007-05-30 西安交通大学 一种制备碳化钨颗粒增强钢基表层复合材料用复合剂
CN100351414C (zh) * 2005-09-05 2007-11-28 西安交通大学 一种制备WCp增强铁基表层复合材料用复合剂
US9003681B2 (en) * 2006-09-18 2015-04-14 Deere & Company Bucket teeth having a metallurgically bonded coating and methods of making bucket teeth
CA2585688C (fr) * 2007-04-20 2014-10-14 Igor Tsypine Pieces coulees resistant a l'usure et leurs procedes de fabrication
DE102010014267A1 (de) * 2010-04-08 2011-10-13 H.C. Starck Gmbh Dispersionen, sowie Verfahren zur deren Herstellung und deren Verwendung
JOP20200150A1 (ar) 2011-04-06 2017-06-16 Esco Group Llc قطع غيار بأوجه مقواه باستخدام عملية التقسية المصلدة والطريقة والتجميع المرافق للتصنيع
PE20142428A1 (es) 2012-01-31 2015-01-22 Esco Corp Material resistente desgaste, y sistema y metodo para crear un material resistente al desgaste
DE102012204614A1 (de) * 2012-03-22 2013-09-26 Man Diesel & Turbo Se Verfahren zum Herstellen eines Gussteils und nach dem Verfahren hergestelltes Gussteil
US9283621B2 (en) 2012-06-21 2016-03-15 Deere & Company Method for forming a composite article
CN102921924B (zh) * 2012-11-02 2015-03-04 北京电力设备总厂 复合耐磨件及其制备方法
US9038359B2 (en) 2012-11-12 2015-05-26 Deere & Company Rotary implement having hard metallic layer and method therefor
US10543985B2 (en) * 2015-01-19 2020-01-28 Flsmidth A/S Interlocking wear-resistant panel system
CN109371333A (zh) * 2018-12-08 2019-02-22 河南工学院 一种陶瓷增强钢复合材料及制备方法
US11103944B2 (en) 2019-08-12 2021-08-31 Deere & Company Self-sharpening cutting tooth for a felling apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340379A1 (fr) * 1976-02-05 1977-09-02 Sandvik Ab Corps composite constitue par un carbure fritte et un alliage de fusion
GB2074912A (en) * 1980-05-01 1981-11-11 Amsted Ind Inc Ferrous metal castings with high hardness inserts
EP0297552A2 (fr) * 1987-07-01 1989-01-04 Kawasaki Jukogyo Kabushiki Kaisha Structures composites et méthodes pour les fabriquer
EP0421374A2 (fr) * 1989-10-05 1991-04-10 Deere & Company Procédé de fabrication d'articles en fonte avec couche superficielle résistante à l'usure et produit réalisé avec ce procédé
EP0470503A1 (fr) * 1990-08-08 1992-02-12 Deere & Company Procédé de fabrication de produits métalliques avec surface résistant à l'usure

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Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340379A1 (fr) * 1976-02-05 1977-09-02 Sandvik Ab Corps composite constitue par un carbure fritte et un alliage de fusion
GB2074912A (en) * 1980-05-01 1981-11-11 Amsted Ind Inc Ferrous metal castings with high hardness inserts
EP0297552A2 (fr) * 1987-07-01 1989-01-04 Kawasaki Jukogyo Kabushiki Kaisha Structures composites et méthodes pour les fabriquer
EP0421374A2 (fr) * 1989-10-05 1991-04-10 Deere & Company Procédé de fabrication d'articles en fonte avec couche superficielle résistante à l'usure et produit réalisé avec ce procédé
EP0470503A1 (fr) * 1990-08-08 1992-02-12 Deere & Company Procédé de fabrication de produits métalliques avec surface résistant à l'usure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 186 (M-962)(4129) 16. April 1990 & JP-A-02 034 269 ( NGK INSULATORS LTD ) 5. Februar 1990 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995001520A1 (fr) * 1993-07-02 1995-01-12 Knorr-Bremse Ag Disque de frein pour freins a disque
DE4418750C2 (de) * 1994-05-28 2000-06-15 Vaw Ver Aluminium Werke Ag Verfahren zur Herstellung von verschleißfesten Oberflächen auf Formgußteilen
EP0687829A1 (fr) * 1994-06-17 1995-12-20 Wagner Electric Corporation Matériau de friction renforcé
CN1053020C (zh) * 1994-12-30 2000-05-31 邵天敏 一种铝及铝合金表面的涂层制备方法
CN104707972A (zh) * 2015-02-15 2015-06-17 广东省工业技术研究院(广州有色金属研究院) 一种复合耐磨件的制备方法
CN104707972B (zh) * 2015-02-15 2018-01-30 广东省材料与加工研究所 一种复合耐磨件的制备方法

Also Published As

Publication number Publication date
US5299620A (en) 1994-04-05
JPH05318085A (ja) 1993-12-03
CA2086873A1 (fr) 1993-07-22
MX9300274A (es) 1993-07-01

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