CN109465457A - A kind of powder metallurgy valve seat of gas engine containing rare earth - Google Patents

A kind of powder metallurgy valve seat of gas engine containing rare earth Download PDF

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Publication number
CN109465457A
CN109465457A CN201811447592.6A CN201811447592A CN109465457A CN 109465457 A CN109465457 A CN 109465457A CN 201811447592 A CN201811447592 A CN 201811447592A CN 109465457 A CN109465457 A CN 109465457A
Authority
CN
China
Prior art keywords
rare earth
gas engine
powder metallurgy
valve seating
valve
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.)
Pending
Application number
CN201811447592.6A
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Chinese (zh)
Inventor
杨爱云
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.)
YIZHENG CHANGDA POWDER METALLURGY PRODUCT CO Ltd
Original Assignee
YIZHENG CHANGDA POWDER METALLURGY PRODUCT CO Ltd
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 YIZHENG CHANGDA POWDER METALLURGY PRODUCT CO Ltd filed Critical YIZHENG CHANGDA POWDER METALLURGY PRODUCT CO Ltd
Priority to CN201811447592.6A priority Critical patent/CN109465457A/en
Publication of CN109465457A publication Critical patent/CN109465457A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • 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
    • B22F3/02—Compacting only
    • 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
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • B22F3/02—Compacting only
    • B22F2003/023—Lubricant mixed with the metal powder

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

Abstract

The invention discloses a kind of powder metallurgy valve seats of gas engine containing rare earth, belong to metallurgical technology field, chemical component and its content (wt%) are as follows: C:0.8~1.2%, Cr:3.7~7.7%, Mo:7.6~15%, Ni:3.6~6.2%, W:2.4~4.1%, rare earth element: 0.1~1.2%, lubricant: 0.1~2%, surplus Fe.Valve seating of the invention, in the preparation first by base iron using basis powder made of water atomization, it is incorporated the alloy powders such as a certain amount of chromium, molybdenum, nickel, tungsten, rare earth element later, by mechanical mixture, compacting, sintering, the physical properties such as valve seating calorific intensity and wearability and mechanical performance is made to be significantly improved.Product of the present invention compression strength is high, has wear-resisting, corrosion-resistant, resistant to high temperatures and shock resistance, is particularly suitable for the needs of gas engine.

Description

A kind of powder metallurgy valve seat of gas engine containing rare earth
Technical field
The invention belongs to metallurgical technology fields, and pre-alloying powder is suppressed, be sintered and is machined, and automobile zero is made The field of metallurgy of component.
Background technique
Valve seating is the important component in engine valve actuating mechanism, and the important sealing friction that partners of it and valve is paid, and is sent out When motivation works, valve seating is impacted by valve, and the washing away of high temperature (530~870 DEG C) burning gases, burn into and burning produce The abrasion of object, dust in air, in addition also by hot cold stress alternating action, it is easily deformed, scaling loss, even disconnected It splits, therefore not only requires Materials for Valve Seat wear-resisting, corrosion-resistant, resistant to high temperatures, also require certain radial crushing strength.
Engine valve and valve seating are in harsh heating power, work under chemistry and mechanical force situation, subject height and answer Power (engine maximum combustion pressure is up to 20MPa), elevated operating temperature (valve disc to planar central is up to 870 DEG C) and corrosive environment (high-temperature fuel gas corrodes, vulcanizes) corrosion and oxidation.
According to the working environment of above-mentioned valve seating, to guarantee its functional reliability and service life, in different building rings Border and in the case where using different fuel, it is necessary to developmental research new material and new process as early as possible.
Summary of the invention
Technical problem solved by the invention is to provide a kind of powder metallurgy valve seat of gas engine containing rare earth.This hair Bright product compression strength is high, has wear-resisting, corrosion-resistant, resistant to high temperatures and shock resistance.It is particularly suitable for the needs of gas engine.
The purpose of the present invention is what is be achieved through the following technical solutions, a kind of powder metallurgy valve of gas engine containing rare earth The chemical component and its content (wt%) of seat: C:0.8~1.2%, Cr:3.7~7.7%, Mo:7.6~15%, Ni:3.6~ 6.2%, W:2.4~4.1%, rare earth element: 0.1~1.2%, lubricant: 0.1~1%, surplus Fe.
Preferably, the chemical component and its content (wt%) of the valve seating are as follows: C:0.9~1.1%, Cr:3.8~ 7.6%, Mo:7.7~14.2%, Ni:3.9~5.8%, W:2.5~4.0%, zinc stearate: 0.1~1%, surplus Fe.
Preferably, the chemical component and its content (wt%) of the valve seating are as follows: C:0.9%, Cr:4.1%, Mo: 8.3%, Ni:4.3%, W:2.8%, rare earth element: 0.3%, lubricant: 0.1~1%, surplus Fe.
Preferably, the chemical component and its content (wt%) of the valve seating are as follows: C:1.0%, Cr:6.3%, Mo: 12.6%, Ni:5.7%, W:3.4%, rare earth element: 0.8%, lubricant: 0.1~1%, surplus Fe.
Preferably, the chemical component and its content (wt%) of the valve seating are as follows: C:1.1%, Cr:7.6%, Mo: 14.5%, Ni:6.1%, W:3.9%, rare earth element: 1.1%, lubricant: 0.1~1%, surplus Fe.
Compared with existing powder metallurgy valve seat technology, valve seating of the present invention is had the advantages that
The first, the present invention by improve hydraulic atomized powder-making technique and rationally add the chromium of certain content, molybdenum, nickel, The alloy powders such as tungsten, rare earth element make the physical properties such as valve seating calorific intensity and wearability by mechanical mixture, compacting, sintering It is significantly improved with mechanical performance.Valve seating sintered blank hardness is HRC35~45, metallographic structure are as follows: martensite+bainite + A is residual+hard phase, density >=7.6g/cm3.It can get equally distributed hard phase on powerful alloy substrate after sintering, greatly The abrasion resistance, heat resistance, corrosion resistance and radial crushing strength for improving product.
The second, valve seating is formd through sintering in the relatively soft institutional framework for substantially inlaying Hard Inclusion, hence it is evident that is mentioned The high wearability of valve seating.This patent product (MR479Q) has passed through Taizhou lucky An Tong engine Manufacturing Co., Ltd dress Machine uses, and properties of product meet requirement, is suitable for the need of combustion gas (natural gas, oil liquefied gas and methanol etc.) engine It wants.
Third, it is of the invention it is used for valve seat be the alloy materials such as chromium, molybdenum, nickel, tungsten, rare earth element, rare earth element be lanthanum, Cerium or cerium-rich mischmetal.Not only crushing strength with higher and high-temperature stability, but also have good heat resistance.It is resistance to The excellent performances such as corrosivity are particularly suitable for the needs of gas engine.
Specific embodiment
A kind of powder metallurgy valve seat of gas engine containing rare earth, chemical component and its content (wt%) are as follows: C:0.8~ 1.2%, Cr:3.7~7.7%, Mo:7.6~15%, Ni:3.6~6.2%, W:2.4~4.1%, rare earth element: 0.1~ 1.2%, lubricant: 0.1~1%, surplus Fe.
Valve seating of the invention is first by base iron using basis powder made of water atomization, Zhi Houpei in preparation Enter the C powder and 0.8% zinc stearate of the alloy powders such as a certain amount of chromium, molybdenum, nickel, tungsten, rare earth element, 0.8~1.2%.By By raw embryo merging push-down sintering furnace sintering, in ammonia dissolving atmosphere, temperature 1100~1150 after mechanical mixture, compacting in 30 minutes It DEG C is sintered, valve seating sintered blank hardness HRC >=30, then by -150 DEG C of freezing processings, is sintered after 200 DEG C of tempering hard Degree is HRC35~45, density >=7.6g/cm3, metallographic structure be martensite+bainite+A it is residual+hard phase, obtained after sintering strong The substantially equally distributed hard phase of the alloy of strength, greatly improves the wear-resisting property of valve seating.+
The preferred zinc stearate of lubricant.
Technical solution in implementing below to the present invention be described, and described example is only one of the invention Point embodiment, rather than whole embodiments.
1 three specific embodiment valve seating chemical components of table and its content (wt%)
The particular product performance parameters of 2 embodiment 1-3 of table
According to reliability test specification, the valve seating product that above-described embodiment 1.2.3 is researched and developed is on test-bed The test of full speed full load is carried out, adds up operation 200 hours, is torn open machine testing, valve seating size all in the margin of tolerance, has no Abrasion, valve do not sink, and service condition is good.
It is high to test Taizhou lucky An Tong engine Manufacturing Co., Ltd used (MR479Q) petrol engine revolving speed, torque Greatly, it is big that power is flopped when air valve drop, and delivery temperature is higher, be 850 ± 10 DEG C, use condition is quite severe, uses same The valve seating of other different materials of part test, when being tested to 50~60 hours, valve seating has different degrees of sinking, on It states test result and shows that valve seating of the present invention has excellent heat-resisting, wear-resisting, impact resistance performance, particularly suitable for combustion gas The needs of (natural gas, oil liquefied gas and methanol etc.) engine.

Claims (5)

1. a kind of powder metallurgy valve seat of gas engine containing rare earth, which is characterized in that the chemical component of the valve seating and its Content (wt%) are as follows: C:0.8~1.2%, Cr:3.7~7.7%, Mo:7.6~15%, Ni:3.6~6.2%, W:2.4~4.1%, dilute Earth elements: 0.1~1.2%, zinc stearate: 0.1~1%, surplus Fe.
2. the powder metallurgy valve seat of gas engine containing rare earth according to claim 1, which is characterized in that the valve seating Chemical component and its content (wt%) are as follows: C:0.9~1.1%, Cr:3.8~7.6%, Mo:7.7~14.2%, Ni:3.9~ 5.8%, W:2.5~4.0%, zinc stearate: 0~1%, surplus Fe.
3. the powder metallurgy valve seat of gas engine containing rare earth according to claim 1, which is characterized in that the valve seating Chemical component and its content (wt%) are as follows: C:0.9%, Cr:4.1%, Mo:8.3%, Ni:4.3%, W:2.8%, rare earth element: 0.3%, lubricant: 0.1~1%, surplus Fe.
4. the powder metallurgy valve seat of gas engine containing rare earth according to claim 1, which is characterized in that the valve seating Chemical component and its content (wt%) are as follows: C:1.0%, Cr:6.3%, Mo:12.6%, Ni:5.7%, W:3.4%, rare earth element: 0.8%, lubricant: 0.1~1%, surplus Fe.
5. the powder metallurgy valve seat of gas engine containing rare earth according to claim 1, which is characterized in that the valve seating Chemical component and its content (wt%) are as follows: C:1.1%, Cr:7.6%, Mo:14.5%, Ni:6.1%, W:3.9%, rare earth element: 1.1%, lubricant: 0.1~1%, surplus Fe.
CN201811447592.6A 2018-11-29 2018-11-29 A kind of powder metallurgy valve seat of gas engine containing rare earth Pending CN109465457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811447592.6A CN109465457A (en) 2018-11-29 2018-11-29 A kind of powder metallurgy valve seat of gas engine containing rare earth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811447592.6A CN109465457A (en) 2018-11-29 2018-11-29 A kind of powder metallurgy valve seat of gas engine containing rare earth

Publications (1)

Publication Number Publication Date
CN109465457A true CN109465457A (en) 2019-03-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811447592.6A Pending CN109465457A (en) 2018-11-29 2018-11-29 A kind of powder metallurgy valve seat of gas engine containing rare earth

Country Status (1)

Country Link
CN (1) CN109465457A (en)

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WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20190315

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