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WO2001049436A2 - Piece moulee, frittee sous pression, produite par metallurgie des poudres - Google Patents

Piece moulee, frittee sous pression, produite par metallurgie des poudres Download PDF

Info

Publication number
WO2001049436A2
WO2001049436A2 PCT/EP2001/000038 EP0100038W WO0149436A2 WO 2001049436 A2 WO2001049436 A2 WO 2001049436A2 EP 0100038 W EP0100038 W EP 0100038W WO 0149436 A2 WO0149436 A2 WO 0149436A2
Authority
WO
WIPO (PCT)
Prior art keywords
valve
molding according
powder
valve body
powder metallurgy
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.)
Ceased
Application number
PCT/EP2001/000038
Other languages
German (de)
English (en)
Other versions
WO2001049436A3 (fr
Inventor
Franz-Josef Schleifstein
Gerd Krüger
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.)
Bleistahl-Produktions & Co KG GmbH
Original Assignee
Bleistahl-Produktions & Co KG GmbH
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 Bleistahl-Produktions & Co KG GmbH filed Critical Bleistahl-Produktions & Co KG GmbH
Publication of WO2001049436A2 publication Critical patent/WO2001049436A2/fr
Publication of WO2001049436A3 publication Critical patent/WO2001049436A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0214—Using a mixture of prealloyed powders or a master alloy comprising P or a phosphorus compound
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the invention relates to a powder-metallurgically produced pressed-sintered molded part with high temperature and wear resistance, which is in particular a valve or valve part for internal combustion engines.
  • Intake and exhaust valves for internal combustion engines must meet high requirements for temperature resistance and wear resistance.
  • temperature resistance and wear resistance In particular in the case of highly compressed modern engines with multi-valve technology and electronic control, it has become increasingly a problem to find materials which can permanently cope with the high temperatures prevailing at the outlet. Accordingly, valves have become more and more complex to manufacture, which has had an impact on the material and processing costs.
  • valve temperatures of 800 ° C - 900 ° C should not be exceeded. However, this is becoming increasingly difficult to maintain in modern engines.
  • valves and valve bodies have become extremely complicated, particularly when armor is used.
  • the valve body is first produced by heating, compressing, calibrating and rotating, to which a rod section is added by friction welding.
  • Other work steps include straightening, turning, grinding and cladding, grinding and heat treatment to the finished valve with seat armor.
  • the build-up welding can lead to errors, which results in an undesirably high reject rate.
  • valves or at least valve bodies from a uniform material in as few steps as possible, the material ensuring the necessary wear resistance, service life and heat dissipation.
  • the metal powder used according to the invention is characterized in particular by a very high carbon, molybdenum and phosphorus content.
  • the carbon and phosphorus content cause the formation of temperature-resistant and wear-reducing carbide and phosphide phases, which give the material the necessary service life.
  • Chromium, vanadium and tungsten can be added to vary the range of properties, but are not absolutely necessary in particular for the production of valves and valve parts.
  • An appreciable sulfur content can serve as an internal lubricant, especially if it is MoS 2 , but is generally not necessary for valves and parts.
  • the moldings produced by powder metallurgy according to the invention can be produced by conventional press-sintering processes. This also includes hot isostatic pressing, although this is not absolutely necessary. In general, compression to 7.5 g / cm 3 is sufficient, although for numerous purposes a higher density, in particular about 7.7 g / cm 3 or more is very advantageous. By increasing the density and the associated reduction in the pore volume, there is also an improvement in the thermal conductivity and thus the temperature behavior. Furthermore, the stability is increased.
  • the molded parts according to the invention can be produced from the corresponding element powders.
  • finished alloy components for the production, for example a finished alloy steel component, a phosphorus-molybdenum steel, optionally MoS 2 and, if necessary, graphite, in each case in powder form.
  • metal powders of irregular shape produced by atomization processes which can give the pressed part produced therefrom a certain internal cohesion by means of teeth.
  • customary auxiliaries can be added, for example wax, in an amount of up to 1% by weight, based on the alloy powder.
  • Dendritic powders with an average diameter of less than 150 ⁇ m are preferably used, preferably less than 50 ⁇ m. Carbon is expediently admixed as graphite with an average size of 10 ⁇ m or less, if not already sufficiently represented in the finished alloy powder.
  • the PMoFe steel powder, as can be used here, is described in WO-A-91/18123.
  • a powder composition with 0.5 to 2.0% carbon, 5.0 to 14% molybdenum, 0.2 to 1.0% phosphorus, 0.1 to 1 is particularly preferred for the production of valves, valve bodies or valve rods , 2% manganese, a maximum of 0.50% chromium and a maximum of 0.40% sulfur. In this case, other elements are represented with less than 2%, the rest is iron.
  • the composition is based on weight percent. For valve bodies in particular, it is advisable to use the liquid phase sintering process.
  • the finished valve body should have a density of at least 7.7 g / cm 3 .
  • valves or valve bodies according to the invention show a high wear resistance even at the high temperatures and loads in the valve train, in particular for exhaust valves.
  • valves the entire valve can be made from the materials described above. However, it is also possible and preferred to produce only the valve body from this material and to manufacture the stem from a conventional material. If the valve body and the valve rod are manufactured separately, the geometry for joining the valve head and valve stem can be varied further. All known welding processes can be used for positive joining processes (press fit). If the fit is blunt, a friction welding process is usually required. As far as the invention relates to valve bodies, these have the advantage over conventional valve bodies that they consist of a uniform material, ie they do not require local modification in order to adapt them to the particular circumstances of a piston outlet of an internal combustion engine. In addition to advantages in terms of production technology, this also means that the product is less susceptible to faults and damage, both in the manufacturing and in the operating phase.
  • the press-sintered shaped bodies according to the invention can also be shaped bodies other than valves, valve bodies or valve stems.
  • the powder composition used for manufacturing may contain a proportion of MoS 2 that supplies the material with up to 5% by weight of sulfur. Sulfur contents of up to 3.0% by weight of the material are particularly suitable.
  • valve bodies which have a central recess into which the valve stem is inserted and welded in a form-fitting manner.
  • any common form of welding can be used.
  • Valves of this type make it possible to connect a valve body manufactured by powder metallurgy to a shaft which is manufactured conventionally or by powder metallurgy. This manufacturing process offers the advantage that the powder-metallurgically manufactured body can be easily connected to a conventional, third-party-equipped and equipped shaft. Naturally, this also applies to valve stems manufactured using powder metallurgy.
  • the press-sintered shaped bodies according to the invention are produced from the premixed or finished alloy powder as follows. First, the blank is pressed out of the powder with the aid of a conventional wax as a lubricant under customary pressing pressures to give moldings with a sufficient density. The pressure is expediently between 500 and 900 MPa. After pressing, the product is first dewaxed under a hydrogen-nitrogen protective gas atmosphere at a temperature of 500 to 750 ° C and then in an oven at a temperature of more than 900 ° C, preferably more than 1000 ° C, up to 1150 ° C, sintered. Pressures and temperatures essentially depend on the desired density of the molded part and on the composition of the metal powder. After cooling, the parts are left on and subjected to the necessary post-treatment steps.
  • valve body and valve stem in separate work steps and then to join them.
  • the valve body is made by powder metallurgy
  • the stub shaft can be made conventionally or powder metallurgically.
  • the body and the shaft can be connected to one another by friction welding, but preference is given to the form-fitting insertion of the shaft into a precisely fitting recess in the body by means of a transition piece or fitting piece which is formed in the lower region of the shaft with a precise fit.
  • the stem and body are then welded to the complete valve and reworked.
  • Fig. 1 shows a valve body 1, which is made by powder metallurgy and is provided for butt connection to a stem 4.
  • Fig. 2 shows a valve body and a stem end as they can be added to a valve according to the invention.
  • the valve body 1 is made by powder metallurgy and shows in its center the receptacle 2 for the fitting 3 of the stem 4.
  • the stem and body are connected to one another by welding.
  • Metal powder of the following chemical composition by weight was used for a sintered body according to the invention:
  • a sintered body made of sintered molybdenum-phosphor steel with a density of 6.9 g / cm 3 was obtained.
  • the molded body showed good wear resistance and a finely divided structure of various carbides in a tempered martensitic matrix with embedded solid lubricant under high surface loads.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Taps Or Cocks (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Secondary Cells (AREA)
  • Ceramic Capacitors (AREA)
  • Gears, Cams (AREA)
  • Lift Valve (AREA)

Abstract

La présente invention concerne une pièce moulée, frittée sous pression, produite par métallurgie des poudres, notamment une soupape ou une partie de soupape. Cette pièce moulée présente une grande résistance thermique et une grande résistance à l'usure. La composition, en poids, de la pièce moulée selon cette invention est la suivante : 0,5 % à 2,0 % de C; 5,0 % à 16 % de Mo; 0,2 % à 1,0 % de P; 0,1 % à 1,4 % de Mn; 0 % à 5 % de Cr; 0 % à 5 % de S; 0 % à 7 % de W; 0 % à 3 % de V; < 2 % d'autres éléments et le reste Fe.
PCT/EP2001/000038 2000-01-06 2001-01-04 Piece moulee, frittee sous pression, produite par metallurgie des poudres Ceased WO2001049436A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10000158 2000-01-06
DE10000158.0 2000-01-06

Publications (2)

Publication Number Publication Date
WO2001049436A2 true WO2001049436A2 (fr) 2001-07-12
WO2001049436A3 WO2001049436A3 (fr) 2002-02-14

Family

ID=7626758

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/EP2001/000038 Ceased WO2001049436A2 (fr) 2000-01-06 2001-01-04 Piece moulee, frittee sous pression, produite par metallurgie des poudres
PCT/EP2001/000036 Ceased WO2001049979A2 (fr) 2000-01-06 2001-01-04 Corps de soupape produit par metallurgie des poudres et soupape equipee dudit corps de soupape

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/000036 Ceased WO2001049979A2 (fr) 2000-01-06 2001-01-04 Corps de soupape produit par metallurgie des poudres et soupape equipee dudit corps de soupape

Country Status (5)

Country Link
EP (1) EP1250518B1 (fr)
AT (1) ATE305084T1 (fr)
AU (2) AU3727401A (fr)
DE (2) DE10031960A1 (fr)
WO (2) WO2001049436A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113564491A (zh) * 2021-07-02 2021-10-29 安徽森拓新材料有限公司 一种高性能粉末冶金气门导管材料

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011109473A1 (de) 2011-08-04 2012-03-15 Daimler Ag Sinterbauteil und Nockenwelle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61270518A (ja) * 1985-05-22 1986-11-29 Toyota Motor Corp 焼結カムシヤフト
JPS62124256A (ja) * 1985-11-21 1987-06-05 Kawasaki Steel Corp 黒鉛が析出した摺動部材用焼結鋼
FR2596067B1 (fr) * 1986-03-19 1991-02-08 Metafram Alliages Fritte Procede de fabrication de pieces en acier rapide fritte
GB2197663B (en) * 1986-11-21 1990-07-11 Manganese Bronze Ltd High density sintered ferrous alloys
AU5997594A (en) * 1994-02-07 1995-08-21 Stackpole Limited Hi-density sintered alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113564491A (zh) * 2021-07-02 2021-10-29 安徽森拓新材料有限公司 一种高性能粉末冶金气门导管材料

Also Published As

Publication number Publication date
AU3727401A (en) 2001-07-16
AU2372001A (en) 2001-07-16
DE50107484D1 (de) 2005-10-27
ATE305084T1 (de) 2005-10-15
WO2001049979A2 (fr) 2001-07-12
EP1250518A2 (fr) 2002-10-23
WO2001049979A3 (fr) 2002-02-28
EP1250518B1 (fr) 2005-09-21
DE10031960A1 (de) 2001-07-12
WO2001049436A3 (fr) 2002-02-14

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