CN1324957A - Iron-base powder metallurgy air valve base for internal combustion engine and its production process - Google Patents
Iron-base powder metallurgy air valve base for internal combustion engine and its production process Download PDFInfo
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- CN1324957A CN1324957A CN 00113452 CN00113452A CN1324957A CN 1324957 A CN1324957 A CN 1324957A CN 00113452 CN00113452 CN 00113452 CN 00113452 A CN00113452 A CN 00113452A CN 1324957 A CN1324957 A CN 1324957A
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- valve seat
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- seat insert
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Abstract
The composition of ion base powder metallurgy gas valve seat for internal combustion engine contains carbon 0.5-1.5%, tungsten 2-6%, molybdenum 1-6%, cobalt 1.2-5%, chromium 1.5-4%, copper 10-21%, vanadium 1-4%, manganese 0.3-1.5% and the rest being iron. Its preparties after being mould-formed and sintered are as follows: hardness is HRC 40-50, density is 7.51-8.13 g/cu.cm and heat conducting coefficient is 10.756-11.032 cal/cm.c.sec. It is specially suitable for use under the condition of lead-less gasoline, and its abrasion-resistance is superior to cast-iron alloy and general marketable iron-base powder metallurgy valve seat, and its service life is long, press is simple and reliable, and its production cost is low.
Description
The invention belongs to a kind of oil engine ferrous based powder metallurgical valve seat insert and technology thereof, it is by adopting polynary a spot of alloying principle, material moiety to the iron-based valve seat insert is rationally adjusted and process optimization, thereby make this valve seat insert have high-density, high strength, and high creep temperature, thereby under the hot operation state, have high rigidity and good abrasion resistance.
As everyone knows, before middle 1990s, the valve seat insert that oil engines such as the general automobile of China, motorcycle use, be to adopt cast iron alloy material to make, what domestic at that time oil engine used is doped fuel, because contained lead produces lead compound in this oil plant after burning, can play good lubrication to valve seat insert, thereby reduced of the wearing and tearing of valve valve, therefore can guarantee the sealing between valve valve and the valve seat, made and start the function works better its valve seat.
But China improves air quality in order to strengthen ecological environmental protection in recent years; especially the Air quality in city, national departments concerned are emphasized, the discharging of strict control motor-vehicle tail-gas; ban use of doped fuel, because lead is harmful element to human body and environment.In recent years, the domestic white gasoline of progressively bringing into use, to no longer provide doped fuel from now on for Motor vehicles, so just, the wear resisting property of the valve seat insert of oil engine is had higher requirement, if still use the cast iron alloy valve seat insert, then valve seat weares and teares easily, work-ing life is not long, between valve valve and the valve seat owing to heavy wear produces the slit, make the working face between valve valve and the valve seat can not keep good coincideing, thereby make the air inlet of cylinder, exhaust is undesired, has directly reduced the output rating of oil engine, when the valve seat insert serious wear, will cause the oil engine cisco unity malfunction.
Oil engine manufacturers such as present domestic automobile, motorcycle are because the use of white gasoline has proposed requirements at the higher level to performances such as valve seat insert are wear-resisting.Before middle 1990s, domestic wear resistance to the oil engine valve seat insert requires never to cause that enough attention, its reason mainly are because home-produced fuel was plumbiferous at that time.To the nineties latter stage; because country is to ecological environmental protection; especially the great attention that Air quality is improved; the eliminating environomental pollution source so just make a decision; wherein the primary pollution source of air is the Motor vehicles discharge tail gas; and use white gasoline can significantly reduce the pollutent of Motor vehicles exhaust emissions, therefore China will completely forbid oil engine and use doped fuel from now on, use white gasoline without exception.At the cast iron alloy valve seat insert that uses under the doped fuel condition, its material hardness is generally: (HRC) 32～40 (high-chromium cast iron alloy hardness HR36～46).If the cast iron alloy valve seat insert is used under the white gasoline condition, then wear resistance reduces significantly, even can't use at all.Therefore, the present required valve seat insert of manufacturer such as domestic automobile engine is by import ferrous based powder metallurgical valve seat or cost height, high-chromium cast iron alloy valve seat that wear resistance is low.Because domestic still do not have under the hot operation condition, have high rigidity, the good powder metallurgy valve seat insert of wear resistance provides.
A patent of Japan's bulletin 25 months Mays in 1992 " the oil engine manufacture method of ferrous based powder metallurgical valve seat " (flat 4-31014), moiety and the weight percent proportioning thereof of having announced the iron(-)base powder of its valve seat are: C:0.1～0.8%, Cr:1～5%, Ni:0.5～2%, Co:2～8%, Nb:0.2～2%, Si:0.3～1%, all the other are iron and unavoidable impurities, announced that also it cooperates auxiliary material moiety and weight percent proportioning to be: graphite 0.4～0.8%, molybdenum 4～15%, a kind of in boron and the phosphorus or two kinds: 0.1～1%, with above-mentioned iron(-)base powder and the together compression moulding of cooperation auxiliary material, in vacuum or reducing gas, carry out sintering then, in 1150～1250 ℃, kept 30～60 minutes, also must heat-treat in addition, promptly kept in 600～800 ℃ 60～90 minutes, the detected result of this patent working example is: density: 7.35～7.7g/cm
3, hardness: HRC42～50, through abrasion test 100 hours, experiment condition was: it is that 2500 rev/mins, the abrasion degree of depth of valve seat load 30kg, valve seat are 30～60 μ m that valve body is heated to 900 ℃, rotating speed.Though the hardness of this valve seat insert is higher, it realizes that by thermal treatment process theoretically, valve seat is to work under 700～750 ℃ hot environment, and the actual hardness during work can reduce, so wear resisting property also can reduce; While complete processing more complicated, the manufacturing cost height.
A patent " oil engine valve seat sintered iron base alloy " (patent No. 5221321) of U.S.'s bulletin on June 22nd, 1993 has announced that the moiety and the weight percent proportioning of the ferrous alloy of valve seat are: C:0.4～2%, Cr:0.5～5%, Mo:5～15%, Ni:0.2～2%, Co:0.4～2%, Cu:8～20%, S:0.01～0.5%, and all the other are Fe; The comparison harshness but it is selected materials, Cr from Fe-Cr alloy powder, Mo from Fe-Mo alloy powder, S from the Fe-S alloy powder.The described technology of this patent is: after the moulding of alloy powder mixed compaction, 1000～1200 ℃ of following sintering are 60～120 minutes in hydrogen, put again in the nitrogen in 1000 °～1200 ℃ following nitridings 15～30 minutes, in 850 °～900 ℃ insulations 20～60 minutes, place oil to cool off then again; Be incubated 60～120 minutes down at 550 °～700 ℃ again, in air, cool off again, the valve seat that it is said this method processing, its density is 7.75～7.9g/cm
3, hardness is HV351～376 (being equivalent to HRC35.7～38.4).Though this patent has been passed through nitriding and secondary ageing is handled, hardness is still not high, and technology is too complicated simultaneously, has increased product cost.
The purpose of this invention is to provide the ferrous based powder metallurgical valve seat insert of a kind of carbon containing, tungsten, molybdenum, cobalt, chromium, copper, vanadium, manganese, make its density, hardness, especially the hardness under high-temperature work environment, wear resisting property obtain to significantly improve; Make it both have high rigidity at normal temperatures, can under high-temperature work environment, have high rigidity, high thermal conductivity, high-wearing feature again, provide a kind of be applicable to the white gasoline be the supporting high rigidity of the oil engine of fuel, wear resisting property excellence, long lifetime and ferrous based powder metallurgical valve seat insert cheap for manufacturing cost, thereby can replace traditional cast iron alloy valve seat insert and wear resisting property is low, work-ing life is short powder metallurgy valve seat insert, guarantee that oil engine in the works better of using under the white gasoline condition, reduces the expense that the user uses valve seat insert.
The object of the present invention is achieved like this: promptly adopt polynary a spot of alloying principle, rationally adjust interpolation element and their weight percent proportioning, optimize technology.In iron powder, add a small amount of or micro-carbon, tungsten, molybdenum, cobalt, chromium, copper, vanadium, manganese alloy element, form compound phase metallic substance.In iron powder, add carbon, tungsten, aluminium, chromium, in material, mainly form the carbide hard particle, thereby improved the high temperature abrasion resistance of material; Add vanadium, cobalt, manganese, mainly improve the hot strength of material; Add copper, mainly improve toughness and the thermal conductivity and the compactness of material; Thereby the over-all propertieies such as hot strength, hardness, thermal conductivity, toughness that make material obtain significantly to improve, therefore improved the wear resistance of valve seat greatly, simultaneously strengthened the anti-oxidant and erosion resistance of material again greatly, so also obtain the work-ing life of valve seat to significantly improve.
Specific practice of the present invention is the powdered alloy that adds following per distribution ratio by weight in iron powder: carbon 0.5～1.5%, tungsten 2～6%, molybdenum 1～6%, cobalt 1.2～5%, chromium 1.5～4%, copper 10～21%, vanadium 1～4%, manganese 0.3～1.5%.The granularity of above-mentioned alloy powder is respectively: below iron powder 100 orders, all the other are below powdered alloy 200 orders.Then with above-mentioned powder mixes, at 6ton/cm
2Pressure is compression moulding next time, and 1050～1200 ℃ of following sintering got final product in 60～90 minutes in reducing atmosphere or vacuum.
Powder metallurgy valve seat insert after above-mentioned art breading can guarantee that its over-all properties is fully improved and improves, facts have proved, the ferrous based powder metallurgical valve seat insert of making by moiety provided by the invention, weight percent proportioning and processing requirement thereof, its salient features cast iron alloy valve seat insert and powder metallurgy valve seat insert more in the past increases significantly, obtained more satisfactory effect, mainly comprised:
One, Specifeca tion speeification:
1, the 7.75～7.9g/cm of its density before by the present invention
3Bring up to 7.51～8.13g/cm
3
2, HRC40～45 are brought up in its hardness (not by nitriding and thermal treatment process) HRC25～40 before by the present invention.
3, the 9.863～10.737cal/cm.c ° .sec of its thermal conductivity before by the present invention brings up to 10.756～11.032cal/cm.c ° of .sec.
Two, wear resisting property and work-ing life: valve seat insert provided by the invention and cast iron alloy material and domestic and international iron-base powder metallurgy material are manufactured the valve seat insert of same specification, be assemblied on the same CF4G27 type petrol engine (4200～4500 rev/mins of 120 horsepowers of engine power, moment of torsion 22kg/m, rotating speed).Through strengthening experiment 110 hours, the wear resistance of finding valve seat of the present invention is equivalent to 2～10 times of valve seat of cast iron alloy material and relevant mmaterial manufacturing both at home and abroad.
Three, owing to moiety of the present invention, weight percent reasonable ratio, simple and reliable process, cheap for manufacturing cost, good in economic efficiency.
Embodiments of the invention are described as follows:
Embodiment 1:
Powder metallurgy valve seat insert moiety, weight percent proportioning are: carbon 0.6%, tungsten 3.5%, molybdenum 6%, cobalt 4%, chromium 2.5%, copper 18%, vanadium 3.5%, manganese 0.55%, all the other are iron.
Embodiment 2:
Powder metallurgy valve seat insert moiety, weight percent proportioning are: carbon 0.95%, tungsten 5.5%, molybdenum 4.5%, cobalt 5%, chromium 4%, copper 20%, vanadium 1%, manganese 1.1%, all the other are iron.
After the powdered alloy of above-mentioned two kinds of Different Weight per distribution ratios mixed respectively, through 6ton/cm
2Pressure is compression moulding next time, and 1120 ℃ of sintering got final product in 60 minutes in a vacuum.
After above-mentioned art breading, press the valve seat insert that embodiment 1 makes, its Specifeca tion speeification is: density: 8.01g/cm
3, hardness: HRC43, thermal conductivity: 11.015cal/cm.c ° .sec; Press the valve seat insert that embodiment 2 makes, its Specifeca tion speeification is: density: 8.10g/cm
3, hardness: HRC45, thermal conductivity: 11.030cal/cm.c ° .sec.
Claims (5)
1, a kind of oil engine ferrous based powder metallurgical valve seat insert wherein contains carbon, chromium, molybdenum, cobalt, copper, it is characterized in that it also contains tungsten, vanadium, manganese.
2, according to the described valve seat insert of claim 1, the optimum weight per distribution ratio that it is characterized in that contained moiety is: carbon 0.5～1.5%, tungsten 2～6%, molybdenum 1～6%, cobalt 1.2～5%, chromium 1.5～4%, copper 10～21%, vanadium 1～4%, manganese 0.3～1.5%, all the other are iron.
3,, it is characterized in that the weight percent proportioning of contained moiety is according to the described valve seat insert of claim 1: carbon 0.6%, tungsten 3.5%, molybdenum 6%, cobalt 4%, chromium 2.5%, copper 18%, vanadium 3.5% manganese 0.55%,, all the other are iron.
4, according to the described valve seat insert of claim 1, it is characterized in that the weight percent proportioning of contained moiety is: carbon 0.95%, tungsten 5.5%, molybdenum 4.5%, cobalt 5%, chromium 4%, copper 20%, vanadium 1%, manganese 1.1%, all the other are iron.
5, a kind of technology that obtains above-mentioned ferrous based powder metallurgical valve seat insert is characterized in that powdered alloy is mixed, at 6ton/cm
2Pressure is compression moulding next time, and 1050-1200 ℃ of following sintering is 60～90 minutes in reducing atmosphere or vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001134523A CN1142307C (en) | 2000-05-24 | 2000-05-24 | Iron-base powder metallurgy air valve base for internal combustion engine and its production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001134523A CN1142307C (en) | 2000-05-24 | 2000-05-24 | Iron-base powder metallurgy air valve base for internal combustion engine and its production process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1324957A true CN1324957A (en) | 2001-12-05 |
| CN1142307C CN1142307C (en) | 2004-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001134523A Expired - Fee Related CN1142307C (en) | 2000-05-24 | 2000-05-24 | Iron-base powder metallurgy air valve base for internal combustion engine and its production process |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1947896B (en) * | 2005-10-12 | 2012-01-11 | 日立粉末冶金株式会社 | Method of manufacturing the anti-wear sintered member |
| CN102601364A (en) * | 2012-03-29 | 2012-07-25 | 湖南天雁机械有限责任公司 | Method for manufacturing exhaust gas recirculation system control valve disc by means of powder metallurgy |
| CN103008642A (en) * | 2012-11-25 | 2013-04-03 | 安徽普源分离机械制造有限公司 | Valve rod powder metallurgy manufacturing method for check valve |
| CN103567433A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder metallurgy valve seat and preparation method thereof |
| CN103572163A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder-metallurgy valve seat insert and preparation method thereof |
| CN105063453A (en) * | 2015-07-27 | 2015-11-18 | 江苏恒尚动力高科有限公司 | High-temperature-resistant and corrosion-resistant turbocharger |
| CN105401100A (en) * | 2015-11-10 | 2016-03-16 | 太仓捷公精密金属材料有限公司 | Iron alloy metallic material |
| CN112522606A (en) * | 2020-11-17 | 2021-03-19 | 安庆帝伯粉末冶金有限公司 | Inlaid powder metallurgy valve seat ring material |
| CN113396233A (en) * | 2019-01-04 | 2021-09-14 | 天纳克股份有限公司 | Hard powder particles with improved compressibility and green strength |
| US20220097134A1 (en) * | 2020-09-30 | 2022-03-31 | Mahle International Gmbh | Method for the powder metallurgical production of a component |
| CN115821163A (en) * | 2021-09-16 | 2023-03-21 | 马勒国际有限公司 | Layered sintered valve seat insert, method for the production thereof, combination therewith and use thereof |
-
2000
- 2000-05-24 CN CNB001134523A patent/CN1142307C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1947896B (en) * | 2005-10-12 | 2012-01-11 | 日立粉末冶金株式会社 | Method of manufacturing the anti-wear sintered member |
| CN102601364B (en) * | 2012-03-29 | 2015-12-09 | 湖南天雁机械有限责任公司 | Powder metallurgy is adopted to manufacture the method for gas recirculation system control valve block |
| CN102601364A (en) * | 2012-03-29 | 2012-07-25 | 湖南天雁机械有限责任公司 | Method for manufacturing exhaust gas recirculation system control valve disc by means of powder metallurgy |
| CN103008642A (en) * | 2012-11-25 | 2013-04-03 | 安徽普源分离机械制造有限公司 | Valve rod powder metallurgy manufacturing method for check valve |
| CN103567433A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder metallurgy valve seat and preparation method thereof |
| CN103572163A (en) * | 2013-10-10 | 2014-02-12 | 铜陵国方水暖科技有限责任公司 | Powder-metallurgy valve seat insert and preparation method thereof |
| CN105063453A (en) * | 2015-07-27 | 2015-11-18 | 江苏恒尚动力高科有限公司 | High-temperature-resistant and corrosion-resistant turbocharger |
| CN105401100A (en) * | 2015-11-10 | 2016-03-16 | 太仓捷公精密金属材料有限公司 | Iron alloy metallic material |
| CN113396233A (en) * | 2019-01-04 | 2021-09-14 | 天纳克股份有限公司 | Hard powder particles with improved compressibility and green strength |
| US20220097134A1 (en) * | 2020-09-30 | 2022-03-31 | Mahle International Gmbh | Method for the powder metallurgical production of a component |
| CN112522606A (en) * | 2020-11-17 | 2021-03-19 | 安庆帝伯粉末冶金有限公司 | Inlaid powder metallurgy valve seat ring material |
| CN115821163A (en) * | 2021-09-16 | 2023-03-21 | 马勒国际有限公司 | Layered sintered valve seat insert, method for the production thereof, combination therewith and use thereof |
| US11959404B2 (en) | 2021-09-16 | 2024-04-16 | Mahle International Gmbh | Layer sintered valve seat ring, process for its production, combinations therewith and their use |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1142307C (en) | 2004-03-17 |
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