CN103551578A - Power metallurgy iron-based engine valve seat and production method thereof - Google Patents
Power metallurgy iron-based engine valve seat and production method thereof Download PDFInfo
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- CN103551578A CN103551578A CN201310472119.4A CN201310472119A CN103551578A CN 103551578 A CN103551578 A CN 103551578A CN 201310472119 A CN201310472119 A CN 201310472119A CN 103551578 A CN103551578 A CN 103551578A
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Abstract
The invention discloses a power metallurgy iron-based engine valve seat. The power metallurgy iron-based engine valve seat is characterized by being made with, by weight, 2.4-2.8 parts of graphite, 3.2-3.4 parts of tungsten, 5.0-5.2 parts of molybdenum, 2.3-2.8 parts of cobalt, 7.4-7.6 parts of chromium, 0.4-0.8 part of copper powder, 86-88 parts of iron powder, 1.5-2.1 parts of V, 0.4-0.8 part of Tc, 0.5-0.8 part of Y, and 2-3 parts of aid. The power metallurgy iron-based engine valve seat is high in hardness, good in wear resistance, stable in quality performance, low in production cost and long in service life, allows an internal combustion engine to normally operate with leadless gasoline, and the cost of using the valve seat is reduced for users.
Description
Technical field
The present invention relates to field of powder metallurgy, particularly a kind of P/m Iron Base engine valve valve seat and preparation method thereof.
Background technology
Due to environmental protection demand, the domestic unleaded gas of progressively bringing into use, so just, the anti-wear performance of the valve seat insert of combustion motor is had higher requirement, if still use cast-iron alloy valve seat insert, valve seat easily weares and teares, service life is not long, between air valve and valve seat because heavy wear produces gap, make the working face between air valve and valve seat can not keep good coincideing, thereby make the air inlet of cylinder, exhaust undesired, directly reduce the power output of internal combustion engine, when valve seat insert serious wear, will cause internal combustion engine cisco unity malfunction.
Constituent and weight percent proportioning that a patent " internal combustion engine valve seat sintered iron base alloy " (patent No. 5221321) of U.S.'s bulletin on June 22nd, 1993 has been announced 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; But it selects materials harsher, Cr from Fe-Cr alloyed powder, Mo from Fe-Mo alloyed powder, S from Fe-S alloyed powder.Technique described in this patent is: by after the moulding of alloyed powder mixed compaction, sintering 60～120 minutes at 1000～1200 ℃ in hydrogen, put again in nitrogen at 1000 °～1200 ℃ nitriding 15～30 minutes, then in 850 °～900 ℃ insulations 20～60 minutes, be then placed in oil cooling; At 550 °～700 ℃, be incubated 60～120 minutes again, more cooling in air, the valve seat that it is said the method processing, its density is 7.75～7.9g/cm3, hardness is HV351～376 (being equivalent to HRC35.7～38.4).Although this patent has passed through nitriding and secondary ageing is processed, hardness is still not high, and technique is too complicated simultaneously, has increased product cost.
Powder metallurgy be produce metal dust or with metal dust (or mixture of metal dust and non-metal powder) as raw material, through being shaped and sintering, produce the industrial technology of metal material, composite and all kinds goods.At present, PM technique has been widely used in the fields such as traffic, machinery, electronics, Aero-Space, weapons, biology, new forms of energy, information and nuclear industry, becomes one of branch of tool development vitality in new material science.That PM technique possesses is significantly energy-conservation, economize material, excellent performance, Product Precision is high and the series of advantages such as good stability, is very suitable for producing in enormous quantities.In addition, part material and the also available PM technique manufacture of complex parts that with conventional cast method and machining process, cannot prepare, thereby enjoy the attention of industrial quarters.Powder metallurgy structural part product material composition is not limited by melting, both can add alloying component, can add other structural constituent yet, and adjusts as requested in sizable scope, and then can reach the effect of mating with steel part in mechanical property.
Powder metallurgy mechanization degree is high, can reduce personnel, can raise the efficiency again, so that cost-saving.PM technique can replace traditional manufacturing process, for the vast traditional forms of enterprises cost-saving.
So study the formula of the powder metallurgy of various components of machine, adapt to different needs, have great importance.
Summary of the invention
The object of this invention is to provide a kind of PM technique of utilizing and manufacture iron-based engine valve valve seat, make its density, hardness, especially the hardness under high-temperature work environment, anti-wear performance obtain and significantly improve.
In order to realize object of the present invention, the present invention passes through following scheme implementation:
An engine valve valve seat, is made by the raw material of following weight portion: graphite 2.4-2.8, tungsten 3.2-3.4, molybdenum 5.0-5.2, cobalt 2.3-2.8, chromium 7.4-7.6, copper powder 0.4-0.8, iron powder 86-88, V 1.5-2.1, Tc 0. 4-0.8, Y 0.5-0.8, auxiliary agent 2-3;
Described auxiliary agent is made by the raw material of following weight portion: iron powder 30-34, aluminium hydroxide 2-3, zinc sulfate 1-2, medical stone 1-2, nano-sized carbon 1-2, jade 2-3, polyisobutene 2-3, aluminate coupling agent DL-411 1-2, carborundum powder 2-3; Preparation method mixes iron powder, aluminium hydroxide, zinc sulfate, medical stone, grind to form 200-300 order powder, then add aluminate coupling agent DL-411 to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.
P/m Iron Base engine valve valve seat of the present invention, is characterized in that, by following concrete steps, is made:
(1) tungsten, molybdenum, cobalt, chromium, copper powder, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 9-11Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 700-750 ℃ carry out sintering 8-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;
(2) other residual components is mixed;
(3) at 60-65 ℃, after mixing and stirring 75-95 minute, pack step (1), (2) material into mould, be pressed into base;
(4) pressed compact is placed in sintering furnace, with 9-12 ℃/min of speed, is warming up to sintering 1-2 hour under 350-450 ℃ of condition, then be warming up to sintering 1.5-2 hour under 650-750 ℃ of condition with 6-8 ℃/min of speed; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1100-1150 ℃ of condition; In last air, be cooled to room temperature.
Valve seat insert hardness of the present invention is high, anti-wear performance is excellent, capability and performance is stable, and low cost of manufacture, long service life guarantee that internal combustion engine, in the normal operation of using under unleaded gas condition, reduces the expense that user uses valve seat insert.
Specific embodiments
Below by instantiation, the present invention is described in detail.
An engine valve valve seat, by following weight portion (kilogram) raw material make: graphite 2.4, tungsten 3.2, molybdenum 5.0, cobalt 2.3, chromium 7.4, copper powder 0.4, iron powder 86, V 1.5, Tc 0. 4, Y 0.5, auxiliary agent 2;
Described auxiliary agent by following weight portion (kilogram) raw material make: iron powder 30, aluminium hydroxide 2, zinc sulfate 1, medical stone 1, nano-sized carbon 1, jade 2, polyisobutene 2, aluminate coupling agent DL-411 1, carborundum powder 2; Preparation method mixes iron powder, aluminium hydroxide, zinc sulfate, medical stone, grind to form 200-300 order powder, then add aluminate coupling agent DL-411 to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.
P/m Iron Base engine valve valve seat of the present invention, is characterized in that, by following concrete steps, is made:
(1) tungsten, molybdenum, cobalt, chromium, copper powder, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 9-11Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 700-750 ℃ carry out sintering 8-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;
(2) other residual components is mixed;
(3) at 60-65 ℃, after mixing and stirring 75-95 minute, pack step (1), (2) material into mould, be pressed into base;
(4) pressed compact is placed in sintering furnace, with 9-12 ℃/min of speed, is warming up to sintering 1-2 hour under 350-450 ℃ of condition, then be warming up to sintering 1.5-2 hour under 650-750 ℃ of condition with 6-8 ℃/min of speed; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1100-1150 ℃ of condition; In last air, be cooled to room temperature.
Through detection, hardness of the present invention: HRC45; Tensile strength: 908MPa.
Claims (2)
1. a P/m Iron Base engine valve valve seat, it is characterized in that, by the raw material of following weight portion, made: graphite 2.4-2.8, tungsten 3.2-3.4, molybdenum 5.0-5.2, cobalt 2.3-2.8, chromium 7.4-7.6, copper powder 0.4-0.8, iron powder 86-88, V 1.5-2.1, Tc 0. 4-0.8, Y 0.5-0.8, auxiliary agent 2-3;
Described auxiliary agent is made by the raw material of following weight portion: iron powder 30-34, aluminium hydroxide 2-3, zinc sulfate 1-2, medical stone 1-2, nano-sized carbon 1-2, jade 2-3, polyisobutene 2-3, aluminate coupling agent DL-411 1-2, carborundum powder 2-3; Preparation method mixes iron powder, aluminium hydroxide, zinc sulfate, medical stone, grind to form 200-300 order powder, then add aluminate coupling agent DL-411 to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.
2. P/m Iron Base engine valve valve seat according to claim 1, is characterized in that, by following concrete steps, is made:
(1) tungsten, molybdenum, cobalt, chromium, copper powder, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 9-11Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 700-750 ℃ carry out sintering 8-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;
(2) other residual components is mixed;
(3) at 60-65 ℃, after mixing and stirring 75-95 minute, pack step (1), (2) material into mould, be pressed into base;
(4) pressed compact is placed in sintering furnace, with 9-12 ℃/min of speed, is warming up to sintering 1-2 hour under 350-450 ℃ of condition, then be warming up to sintering 1.5-2 hour under 650-750 ℃ of condition with 6-8 ℃/min of speed; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1100-1150 ℃ of condition; In last air, be cooled to room temperature.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561773A (en) * | 2015-01-28 | 2015-04-29 | 吴江华诚复合材料科技有限公司 | Powder metallurgy material for molds and preparation method thereof |
| CN104550933A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | High-temperature resistant and high-pressure resistant powder metallurgy material for valve and preparation method of high-temperature and high-pressure resistant powder metallurgy material |
| CN105772732A (en) * | 2016-03-19 | 2016-07-20 | 蔡建斌 | Engine valve seat |
| CN106623904A (en) * | 2016-11-16 | 2017-05-10 | 马鞍山市恒欣减压器制造有限公司 | Heat-resistant ferrous-based powder metallurgy self-lubricating CNG engine valve seat ring and manufacturing method thereof |
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| CN101407889A (en) * | 2008-11-21 | 2009-04-15 | 海安县鹰球集团有限公司 | Powder metallurgy rare earth copper coated ferroalloy oil-retaining bearing and manufacturing method thereof |
| CN102015163A (en) * | 2005-01-10 | 2011-04-13 | H.C.施塔克股份有限公司 | Metallic powder mixtures |
| CN102859024A (en) * | 2010-03-19 | 2013-01-02 | 科卢斯博知识产权有限公司 | Iron- chromium- molybdenum - based thermal spray powder and method of making of the same |
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2013
- 2013-10-11 CN CN201310472119.4A patent/CN103551578A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102015163A (en) * | 2005-01-10 | 2011-04-13 | H.C.施塔克股份有限公司 | Metallic powder mixtures |
| CN101407889A (en) * | 2008-11-21 | 2009-04-15 | 海安县鹰球集团有限公司 | Powder metallurgy rare earth copper coated ferroalloy oil-retaining bearing and manufacturing method thereof |
| CN102859024A (en) * | 2010-03-19 | 2013-01-02 | 科卢斯博知识产权有限公司 | Iron- chromium- molybdenum - based thermal spray powder and method of making of the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550933A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | High-temperature resistant and high-pressure resistant powder metallurgy material for valve and preparation method of high-temperature and high-pressure resistant powder metallurgy material |
| CN104561773A (en) * | 2015-01-28 | 2015-04-29 | 吴江华诚复合材料科技有限公司 | Powder metallurgy material for molds and preparation method thereof |
| CN105772732A (en) * | 2016-03-19 | 2016-07-20 | 蔡建斌 | Engine valve seat |
| CN106623904A (en) * | 2016-11-16 | 2017-05-10 | 马鞍山市恒欣减压器制造有限公司 | Heat-resistant ferrous-based powder metallurgy self-lubricating CNG engine valve seat ring and manufacturing method thereof |
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Application publication date: 20140205 |