EP3325194A1 - Système tribologique comprenant un siège de soupape rapporté et une soupape - Google Patents

Système tribologique comprenant un siège de soupape rapporté et une soupape

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Publication number
EP3325194A1
EP3325194A1 EP16735845.6A EP16735845A EP3325194A1 EP 3325194 A1 EP3325194 A1 EP 3325194A1 EP 16735845 A EP16735845 A EP 16735845A EP 3325194 A1 EP3325194 A1 EP 3325194A1
Authority
EP
European Patent Office
Prior art keywords
weight
valve
powder
tribological system
composition
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.)
Granted
Application number
EP16735845.6A
Other languages
German (de)
English (en)
Other versions
EP3325194B1 (fr
Inventor
Heiko Heckendorn
Peter Jäggi
Roland Ruch
Roland Scholl
Klaus Wintrich
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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Publication of EP3325194A1 publication Critical patent/EP3325194A1/fr
Application granted granted Critical
Publication of EP3325194B1 publication Critical patent/EP3325194B1/fr
Active legal-status Critical Current
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Classifications

    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/008—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of engine cylinder parts or of piston parts other than piston rings
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • 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
    • C22C33/0257—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%
    • C22C33/0285—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% with Cr, Co, or Ni having a minimum content higher than 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
    • C22C33/0257—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%
    • C22C33/0292—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% with more than 5% preformed carbides, nitrides or borides
    • 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/241—Chemical after-treatment on the surface
    • B22F2003/242—Coating
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment

Definitions

  • Tribological system comprising a valve seat ring and a valve
  • the invention relates to a tribological system comprising a valve seat ring made of sintered material and an untreated or at least hardened in the seat and / or armored valve.
  • valve and the associated valve seat ring which together form a tribological system. They seal the combustion chamber and control the gas exchange in the engine.
  • the interacting and interacting surfaces in this system are subject to extremely complex stresses due to the load collective acting in an internal combustion engine, which is composed of mechanical, thermal, tribological and chemical stress.
  • valve seat ring must have a high strength, in particular a high resistance to deformation at medium temperatures (creep resistance), as well as a high hot hardness, especially as the exhaust valves hit the valve seat more than 70 times per second.
  • valve seat rings In order to ensure a rapid heat transfer in the cylinder head and a lowering of the valve temperature, valve seat rings must also have a good thermal conductivity. And last but not least, high lubricity and wear resistance are mandatory requirements for valve seat inserts.
  • Valve seat rings having the above properties are usually available by sintering a sintered material.
  • the powder composition usually consists of a combination of a high-speed steel powder (for example the commercially widespread powders K3 and K1) and one or more Fe-based hard phases, optionally also on a Co base, as well as other constituents as solid lubricants, such as sulfides, z. MoS 2 or K13, and / or graphite and / or copper and / or CaF 2 .
  • these valve seat inserts are also infiltrated with copper to achieve higher thermal conductivity and better machinability.
  • a disadvantage of these valve seat ring materials is that they are often relatively aggressive to the counter rotor and thus also cause higher wear on the valve.
  • valves and in particular the valve disks, must have a high heat resistance as well as a high wear resistance due to temperatures of up to 1 000 ° C.
  • it is customary to armor, harden and / or nitride the valves, in particular the valve disks, in order to improve the tribological properties of the system.
  • tribological systems where the valve discs are not superficially treated.
  • US6318327B1 describes a tribosystem consisting of valve seat ring and valve.
  • the valve seat ring consists of an iron-based sintered material and fine deposits of 10 to 50% by weight of a CoMoCr-based hard intermetallic phase, for example T 800 and T 400.
  • Solid lubricants sulfides, nitrides, fluorides, graphite
  • the sintering takes place in a vacuum. This is very disadvantageous for a continuous sintering process of large numbers.
  • an austenitic steel is used (SUH35 (JIS G 431 1: 21% Cr-4% Ni-9% Mn-O.4% NO.5% C-Fe (balance)), which nitrides to improve wear resistance or armored with stellite F, 6 or 12 or with K8, K10 to improve the tribological properties of the system.
  • SAH35 JIS G 431 1: 21% Cr-4% Ni-9% Mn-O.4% NO.5% C-Fe (balance)
  • nitrides to improve wear resistance or armored with stellite F, 6 or 12 or with K8, K10 to improve the tribological properties of the system.
  • WO 2009 024 809 A1 discloses a material for a valve seat ring, in which an iron-based alloy with reduced contents of carbides of the elements Mo, W, V and Nb is used. This powder makes up the major part of the powder mixture to be processed. It also contains the usual additives for improving processing, sintering and solid lubricants as well as hard phases and copper.
  • valve and valve seat ring In addition to the individual properties of valve and valve seat ring, it is important for a tribological system to minimize the mechanical, physical and / or chemical interactions of the partners. As a rule, this is ensured by external lubrication via fuels, combustion products or engine oil. If this external lubrication is significantly reduced or it is completely eliminated, the tribological system, which was previously exposed to liquid or mixed friction, is increasingly exposed to solid friction, which leads to a higher overall wear.
  • the object of the invention is to provide a tribological system comprising a valve seat ring and an untreated or a hardened and / or armored valve, which avoids the disadvantages of the prior art, and in particular has a higher wear resistance with reduced overall wear.
  • the tribological system according to the invention comprises a first tribological partner, namely a valve seat ring produced from a sintered material, which is characterized in that the sintered material is obtainable by pressing and sintering a mixture of individual powder components, the 5 to 45 wt .-% of one or more Fe-based hard phases and
  • the second tribological partner is at least in the seat area hardened and / or armored and / or nitrided valve.
  • the seat armor or the nitriding also serves to achieve a better sealing effect of the valve during operation.
  • the valves are nitrided and / or armored in the seating area with an iron or co-based material.
  • the tribological system according to the invention comprises a first tribological partner, namely a valve seat ring made of a sintered material, characterized in that the sintered material is obtainable by consolidating and sintering a mixture of individual powder components containing 5 to 45 wt or several Fe-based hard phases having a composition of 0 to 0.2% by weight of C, 26 to 32% by weight of Mo, 8 to 12% by weight of Cr, 2.2 to 3% by weight of Si and 0 to 2 wt .-% graphite particles and / or 0 to 2 wt .-% MnS and / or 0 to 2 wt .-% FeP and / or 0 to 2 wt .-% MoS 2 powder and / or 0 to 7 wt .-% Cu and / or 0 to 4 wt .-% co-powder and
  • a high-speed steel powder similar powder having a composition of 14 to 18 wt .-% Cr, 1, 2 to 1, 9 wt .-% C, 0 1 to 0.9 wt .-% Si, 0.5 to 2.5 wt .-% V, 0.5 to 2.5 wt .-% W, 0.5 to 2.5 wt .-% Mo and as the remainder Fe and production-related impurities, in particular by Ni, Cu, Co, Ca and / or Mn with proportions ⁇ 1, 5 wt .-%, contains.
  • a second tribological partner namely a superficially untreated valve.
  • the second tribological partner is at least in the seat area hardened and / or armored and / or nitrided valve.
  • the seat armor or the nitriding also serves to achieve a better sealing effect of the valve during operation.
  • the valves are nitrided and / or armored in the seating area with an iron or co-based material.
  • the invention is based on the surprising finding that by the described material composition in the valve seat ring on the mixture of the selected starting powder and by the clever choice of the valve, tribological partner can be achieved, in which the solid friction in the system valve seat ring - valve reduced and thus the overall wear can be significantly reduced.
  • the tribological system also includes the valve guide in addition to valve seat ring and valve with plate and shaft.
  • the valve guide in addition to valve seat ring and valve with plate and shaft.
  • the Adjustment of the valve guide should not be disregarded.
  • a corresponding material pairing of valve stem and valve guide is required.
  • the wear resistance of the tribological system according to the invention u.a. depends on the hardness and the thickness of a formed at least in the seating area of the valve Nitnerdiffusions Mrs. The best results are achievable with a hardness> 510 HV and a thickness> 19 ⁇ m. It has also been found that the wear resistance of the tribological system according to the invention u.a. depends on the type of layer and layer thickness of an armature formed at least in the seating area of the valve. The best results are achievable with a layer thickness of the armor of> 400 ⁇ and a Co content and / or Fe content of> 40%.
  • valve seat ring materials of the present invention in combination with the standard blend Nireva 3015 (having the composition in weight percent: to 0.08 C, to 0.5 Si, to 0.5 Mn, to 0.015 P, to 0.01 S, 13.5 to 15.5 Cr, 30.0 to 33.5 Ni, 0.4 to 1, 0 Mo, 1, 6 to 2.2 Al, 2.3 to 2.9 Ti , 0.4 to 0.9 Nb and balance Fe) or with the standard mixture Nimonic 80 (with the composition in wt .-%: 0.04 to 0, 1 C, to 1, 0 Si, to 1, 0 Mn , to 0.02 P, to 0.015 S, 18.0 to 21, 0 Cr,> 65.0 Ni, to 3.0 Fe, to 2.0 Co, 1 to 0 to 1, 8 Al and 1, 8 to 2.7 Ti) after optimal heat treatment even without superficial treatment, such as nitriding or tanks, have a reduced overall wear.
  • the standard blend Nireva 3015 having the composition in weight percent: to 0.08 C, to 0.5 Si, to 0.5 Mn
  • Fe-based hard phases are less expensive than Ni and Co based alloys and can be tailored to specific applications by heat treatment. Carbon hardens the matrix and also forms hard carbides that increase wear resistance. A further reduction of the wear can be achieved if the Fe-based hard phase 26 to 32 wt .-% Mo, 8 to 12 wt .-% Cr and 2.2 to 3 wt .-% Si, preferably 26 to 32 wt % Mo, 14 to 20% Cr and 2.9 to 4.2% Si by weight.
  • the sintered material in addition to an Fe-based hard phases additionally a co-based hard phase.
  • the sintered material is additionally admixed with a co-based hard phase preferably in a proportion of 0.5 to 9.9% by weight.
  • Preferred hard phases (Table 2) based on Fe are K1 1, K6, K7 and K4. Particularly preferred are K6 and K7.
  • Preferred co-based hard phases to be considered in the described tribosystem are K8, K9 and K10, with K8 and K9 being particularly preferred. The composition of the hard phases is explained below.
  • Table 1 shows the compositions of a powder mixture "Invention” and a comparison mixture “Comparison 3” according to the invention. Manufacturing and performance additives (e.g., sulfides) are included in “Other.” Some examples of mixing components used or usable in the context of the invention are compiled as Table 2 (starting powders).
  • Table 1 Powder mixtures without solid lubricant, process-related additives and Cu infiltrants
  • Table 2 Starting powders which can be used for mixtures according to the invention (data in% by weight). The compositions given are to be understood as average values from various deliveries, which may differ by about 10% to 30%, based on the final value and the absolute content.
  • the powders listed in Table 1 and specified in Table 2 are mixed in a tumble mixer for 30 minutes. Thereafter, these mixtures are pressed at a pressure of 700 MPa to valve seat rings ( ⁇ a: 30 mm, ⁇ : 23 mm, height: 6 mm).
  • a subset of the rings is sintered at a temperature of 1 .1 10 to 1.125 ° C (about 30 min) under N 2 -H 2 (17 to 25 vol .-% H 2 ) in a continuous furnace.
  • Another subset is subjected to sintering at 1.132 to 1.145 ° C (about 30 minutes) under N 2 -H 2 (17 to 25% by volume H 2 ).
  • the sintered material was gem.
  • Table 4 heat treatment
  • Table 6 shows both hardness and 0.2% compression yield strength at room temperature and at 300 ° C. Surprisingly, despite the coarser carbides, the strength values of the sintered material according to the invention are comparable to those of conventional comparative material (eg comparison 3).
  • Table 6 Strength and Curing Characteristics After Sintering / Heat Treatment of Inventive Powder Mixture "Invention” and Comparative Mixture “Comparison 3" Performance is evaluated in a tribological system for overall wear on the valve seating ring and valve seat of a Steint F armored valve.
  • Fig. 1 gives the corresponding results for the sintered / heat treated valve seat ring valve combinations of the inventive powder blend "invention” and the mixture to be compared "Comparison 3" again, as well as for two other mixtures corresponding to the prior art.
  • Fig. 1 Overall wear - after motor testing in the tribological system "valve seat ring - valve seat”, wherein in addition to the valve seat ring inventively produced (“invention”) valve seat rings from the comparative materials "Comparison 1",
  • Fig. 1 illustrates the improved performance of the tribological system "invention” according to the invention.
  • the valve seat ring consists of in wt .-%: C: 1, 5; S: 0.6 Cr: 3; Mo: 5 to 15; Cu: 10 to 20; V: 2; Fe: rest; others: 4.
  • Comparison 2 is a Co-containing material that contains high levels of the refractory metals Mo and W in addition to this expensive raw material.
  • the functional range consists of the elements in wt%: C: 0.5 to 2; Mn: 1; Cr: 3 to 6; Mo: 8 to 15; Co: 16 to 22; W: 2 to 5; V: 1 to 3; Cu: 12 to 22; Fe: rest; others: 3.
  • valve seat ring has the following composition in wt .-%: 0.5 bis1, 5; Si: 0.2 to 1.0; Cr: 2.5-5; Mo: 5 to 8; W: 3 to 6; V: 1 to 4; Cu: 10 to 20; Fe: rest; others: 3 and in "invention" the VSR has the composition: C: 1 to 1, 8; Si: 0.2 to 1.8; Mn: 0.6; Cr: 10 to 15; Mo: 2.5 to 4.5; V: 0.4 to 1, 0; Cu: 0.8 to 1.5; Fe: rest; others: 3.
  • valve seat ring "invention” contains significantly low proportions of expensive elements and achieves significantly lower overall wear.
  • Example 1 Comparing the materials described in Example 1 ( Figure 1) (Comparative 1, Comparative 3 and Invention) in a test using armored (Steint F) and nitrided X50 valves as the tribopartner, a motor test is shown after 100 hours . that the total wear (Fig. 2) increases with nitrided exhaust valve, only slightly compared to that of an armored valve with inventive material. Compared with the commercially available comparison materials Comparison 1 and Comparison 3, this tribune pairing is clearly superior.
  • valve seat materials described in Example 1 show in a motor test (500 h, cold-warm endurance run) with uncoated or untreated Nimonic 80 - outlet valves with a very low overall wear.
  • the wear on the valve seat ring and on the valve disk is so small that it can not be measured.
  • the inventive material (invention) can still be seen original processing traces. Since the inventive material is particularly cost-effective due to the use of small amounts of special carbides, a significant economic advantage over the comparative material "Comparison 3" results with comparable technical (unmeasurable total wear) level.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Lift Valve (AREA)

Abstract

L'invention concerne un système tribologique comprenant un siège de soupape rapporté composé d'un matériau fritté et une soupape non traitée ou durcie et/ou blindée au moins dans la zone du siège. Le système est caractérisé en ce que le matériau fritté est obtenu par pressage et frittage d'un mélange de poudres composé de 5 à 45 % en poids d'une ou de plusieurs phases dures à base de fer, 0 à 2 % en poids de particules de graphite, 0 à 2 % en poids de poudre de MnS, 0 à 2 % en poids de poudre de MoS2, 0 à 2 % en poids de poudre de FeP, 0 à 7 % en poids de Cu- et 0 à 4 % en poids de poudre de Co, 0,1 à 1,0 % en poids d'un adjuvant de compression, d'un acier rapide composé de 14 à 18 % en poids de Cr, 1,2 à 1,9 % en poids de C, 0,1 à 0,9 % en poids de Si, 0,5 à 2,5 % en poids de V, 0,5 à 2,5 % en poids de W, 0,5 à 2,5 % en poids de Mo, le reste étant Fe ainsi que les impuretés inhérentes à la fabrication, en particulier par Ni, Cu, Co, Ca et/ou Mn dans des proportions < 1,5 % en poids.
EP16735845.6A 2015-07-21 2016-06-30 Système tribologique comprenant un siège de soupape et une soupape Active EP3325194B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015213706.6A DE102015213706A1 (de) 2015-07-21 2015-07-21 Tribologisches System, umfassend einen Ventilsitzring und ein Ventil
PCT/EP2016/065368 WO2017012841A1 (fr) 2015-07-21 2016-06-30 Système tribologique comprenant un siège de soupape rapporté et une soupape

Publications (2)

Publication Number Publication Date
EP3325194A1 true EP3325194A1 (fr) 2018-05-30
EP3325194B1 EP3325194B1 (fr) 2020-05-20

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Application Number Title Priority Date Filing Date
EP16735845.6A Active EP3325194B1 (fr) 2015-07-21 2016-06-30 Système tribologique comprenant un siège de soupape et une soupape

Country Status (5)

Country Link
US (1) US10612432B2 (fr)
EP (1) EP3325194B1 (fr)
JP (1) JP6767398B2 (fr)
DE (1) DE102015213706A1 (fr)
WO (1) WO2017012841A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3406865B1 (fr) * 2017-03-28 2020-01-29 Kabushiki Kaisha Riken Siège de soupape fritté
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DE102015213706A1 (de) 2017-01-26
JP2018529015A (ja) 2018-10-04
US20180209311A1 (en) 2018-07-26
JP6767398B2 (ja) 2020-10-14
WO2017012841A1 (fr) 2017-01-26
EP3325194B1 (fr) 2020-05-20

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