CN103567433A - Powder metallurgy valve seat and preparation method thereof - Google Patents
Powder metallurgy valve seat and preparation method thereof Download PDFInfo
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- CN103567433A CN103567433A CN201310467606.1A CN201310467606A CN103567433A CN 103567433 A CN103567433 A CN 103567433A CN 201310467606 A CN201310467606 A CN 201310467606A CN 103567433 A CN103567433 A CN 103567433A
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Abstract
The invention discloses a powder metallurgy valve seat, which is characterized in that the valve seat is made of the following raw materials in parts by weight: 3.1-3.2 parts of copper, 6.1-6.4 parts of molybdenum, 6.1-6.2 parts of nickel, 1.1-1.4 parts of molybdenum disulfide, 1.1-1.5 parts of graphite, 86-88 parts of iron powder, 7.2-7.4 parts of Mg, 3.5-3.8 parts of Ti, 1.2-1.5 parts of V, 0.52-0.66 parts of Ta, 0.1-0.2 parts of Pd and 2-3 parts of assistant. The graphite is added into the raw materials, so that the wear resistance and the lubricating property of a shaft sleeve are improved, and the manufactured shaft sleeve is compact in tissue, good in microstructure, very small in pore, and excellent in structural stiffness, hardness, fatigue performance and tensile strength; a process of adding lead powder is omitted, so that the pollution to the environment is reduced, the valve seat can be applied to a lead-free gasoline engine, and the service life of the valve seat is prolonged.
Description
Technical field
The present invention relates to field of powder metallurgy, particularly a kind of powder metallurgy valve seat and preparation method thereof.
Background technology
Automobile engine valve seat is to be frequently hit in engine, vital part easy to wear, described valve seat general work temperature is 600～700 ℃, transient temperature can reach 1000 ℃ of left and right, the circulation piston tappet that bears 200 times/min impacts, and be to work under the burning gases corrosion of compression, therefore, valve seat material must possess wear-resisting, high temperature resistant, corrosion-resistant, anti-fatigue performance.At present, valve seat material adopts CrMo alloy iron conventionally, its better mechanical property, but that weak point is production cost is high, and stock utilization only has 25～30%, and energy consumption is large, and the self lubricity of cast member is poor.Therefore cast member valve seat, in the situation that adopting unleaded gas, produces inordinate wear in the short time, causes combustion gas leakage, causes engine power to decline, and contaminated environment.
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 powder metallurgy valve seat and preparation method thereof.
In order to realize object of the present invention, the present invention passes through following scheme implementation:
, by the raw material of following weight portion, made: copper 3.1-3.2, molybdenum 6.1-6.4, nickel 6.1-6.2, molybdenum bisuphide 1.1-1.4, graphite 1.1-1.5, iron powder 86-88, Mg 7.2-7.4, Ti 3.5-3.8, V 1.2-1.5, Ta 0.52-0.66, Pd 0.1-0.2, 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.
Powder metallurgy valve seat of the present invention, by following concrete steps, made:
(1) copper, molybdenum, nickel, iron powder, Mg, Ti, V, Ta, Pd 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 1080-1180 ℃ of condition; In last air, be cooled to room temperature.
In raw material of the present invention, increase graphite, increased wearability and the lubricity of axle sleeve, the axle sleeve dense structure of manufacture, microstructure is good, and seldom, the rigidity of structure, hardness, fatigue performance, tensile strength properties are good for hole; The present invention has removed interpolation lead powder technique, reduces environment ground contamination, can be used for unleaded gas engine, has extended valve seat service life.
Specific embodiments
Below by instantiation, the present invention is described in detail.
, by following weight portion (kilogram) raw material make: copper 3.1, molybdenum 6.1, nickel 6.1, molybdenum bisuphide 1.1, graphite 1.1, iron powder 86, Mg 7.2, Ti 3.5, V 1.2, Ta 0.52, Pd 0.1, 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.
Powder metallurgy valve seat of the present invention, by following concrete steps, made:
(1) copper, molybdenum, nickel, iron powder, Mg, Ti, V, Ta, Pd 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 1080-1180 ℃ of condition; In last air, be cooled to room temperature.
Through detection, hardness of the present invention: HRC54; Tensile strength: 1160MPa.
Claims (2)
1. a powder metallurgy valve seat, it is characterized in that, by the raw material of following weight portion, made: copper 3.1-3.2, molybdenum 6.1-6.4, nickel 6.1-6.2, molybdenum bisuphide 1.1-1.4, graphite 1.1-1.5, iron powder 86-88, Mg 7.2-7.4, Ti 3.5-3.8, V 1.2-1.5, Ta 0.52-0.66, Pd 0.1-0.2, 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. powder metallurgy valve seat according to claim 1, is characterized in that, by following concrete steps, is made:
(1) copper, molybdenum, nickel, iron powder, Mg, Ti, V, Ta, Pd 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 1080-1180 ℃ of condition; In last air, be cooled to room temperature.
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| CN201310467606.1A CN103567433A (en) | 2013-10-10 | 2013-10-10 | Powder metallurgy valve seat and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550929A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-nitrogen powder metallurgy valve and preparation method thereof |
| CN104550910A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Easily radiating powder metallurgy material for valve and preparation method of material |
| CN104550914A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-based self-lubrication powder metallurgy material for valve and preparation method of material |
| CN104550927A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-base powder metallurgy material containing electric fused mullite powder for valve and preparation method of iron-base powder metallurgy material |
| CN106439084A (en) * | 2016-10-14 | 2017-02-22 | 广西欧讯科技服务有限责任公司 | Novel wear-resisting ball valve |
| 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 |
| CN109706372A (en) * | 2019-02-18 | 2019-05-03 | 益阳市再超粉末冶金有限公司 | A kind of sintering method of powdered metallurgical material gear |
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| CN1131595A (en) * | 1995-10-05 | 1996-09-25 | 电子工业部第二研究所 | Manufacture method of powder metallurgy valve seat |
| CN1324957A (en) * | 2000-05-24 | 2001-12-05 | 曾佑鑫 | Iron-base powder metallurgy air valve base for internal combustion engine and its production process |
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| CN103252494A (en) * | 2013-04-09 | 2013-08-21 | 吴建平 | Powder metallurgy preparation method of compressor valve plate |
| CN103252498A (en) * | 2013-04-09 | 2013-08-21 | 吴建平 | Method for preparing powder metallurgy of valve seat |
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| CN1131595A (en) * | 1995-10-05 | 1996-09-25 | 电子工业部第二研究所 | Manufacture method of powder metallurgy valve seat |
| CN1324957A (en) * | 2000-05-24 | 2001-12-05 | 曾佑鑫 | Iron-base powder metallurgy air valve base for internal combustion engine and its production process |
| WO2002075171A1 (en) * | 2001-03-16 | 2002-09-26 | Sundram Fasteners Limited | Conrod and a method of producing the same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550929A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-nitrogen powder metallurgy valve and preparation method thereof |
| CN104550910A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Easily radiating powder metallurgy material for valve and preparation method of material |
| CN104550914A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-based self-lubrication powder metallurgy material for valve and preparation method of material |
| CN104550927A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-base powder metallurgy material containing electric fused mullite powder for valve and preparation method of iron-base powder metallurgy material |
| CN106439084A (en) * | 2016-10-14 | 2017-02-22 | 广西欧讯科技服务有限责任公司 | Novel wear-resisting ball valve |
| 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 |
| CN109706372A (en) * | 2019-02-18 | 2019-05-03 | 益阳市再超粉末冶金有限公司 | A kind of sintering method of powdered metallurgical material gear |
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