CN103882325A - Composite powder material for making high-performance abrasion resistant exhaust valve seat, and its application - Google Patents
Composite powder material for making high-performance abrasion resistant exhaust valve seat, and its application Download PDFInfo
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- CN103882325A CN103882325A CN201210558623.1A CN201210558623A CN103882325A CN 103882325 A CN103882325 A CN 103882325A CN 201210558623 A CN201210558623 A CN 201210558623A CN 103882325 A CN103882325 A CN 103882325A
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Abstract
The invention discloses a composite powder material for making a high-performance abrasion resistant exhaust valve seat, and its application, and belongs to the technical field of making of exhaust valve seats. The composite powder material comprises, by mass, 8-12% of Mo, 4-8% of Ni, 0.5-2.5% of Cr, 1-3% of V, 0-2.5% of Cu, 0.5-2.0% of C, 1% or less of impurities, and the balance Fe. A making method of the exhaust valve seat comprises the following steps: 1, powder preparation: preparing iron-based pre-alloy powder with the granularity of 100 meshes through a pre-alloy diffusion process; 2, compacting: adding graphite having an amount accounting for 0.5-2.0% of the mass of the composite powder material and zinc stearate having an amount accounting for 0.5-1.0% of the mass of the composite powder material, and compacting under a pressure of 600-800Mpa; and 3, sintering: sintering in ammonia decomposition atmosphere for 0.5-1h to make the high-performance abrasion resistant exhaust valve seat. The method has the advantages of simple flow and high technical content, and the made exhaust valve seat has the advantages of unlikely segregation and good abrasion resistance, and is suitable for the automobile industry.
Description
Technical field
The invention belongs to automobile exhaust gate seat preparing technical field, be specifically related to a kind of composite powder material and application thereof of preparing high-performance abrasion-proof erosion exhaust valve seat.
Background technology
Powder metallurgy is that a kind of logging material and part are prepared forming technique in the advanced manufacturing technology of one, has energy-conservation, material-saving, efficient, near-net-shape, the advantage such as pollution-free.The consumption of powder metallurgy component is one of marks of weighing a national development of automobile level, also represents the developmental level of this state's powder metallurgy technology simultaneously.
In recent years, sintered metal product manufacturing enterprise of China strengthens research and development and drops into, and obtains very large progress at the aspect such as product stability and new product development, dwindles fast with the gap of developed countries.But aspect product stability and high-end product (as high-performance pre-alloyed powder goods etc.), also there is larger gap, can not meet the high speed development demand of China's powder metallurgy.
In sum, this method is prepared Fe-Mo-Ni-Cr-V-Cu iron-based diffusion part prealloy powder and goods thereof, is the guarantee of producing high-performance abrasion-proof erosion automobile exhaust gate seat.
At present, still there is no research and the patent report about the preparation method of such exhaust valve seat.The present invention adopts the techniques such as powder process, compacting, sintering, is finally prepared into Fe-Mo-Ni-Cr-V-Cu-C iron-based high-performance abrasion-proof erosion exhaust valve seat, and this technical process is simple, with high content of technology.
Summary of the invention
The object of the present invention is to provide a kind of composite powder material of preparing high-performance abrasion-proof erosion exhaust valve seat.
The present invention also aims to provide the method for utilizing the composite powder material of above-mentioned high-performance abrasion-proof erosion exhaust valve seat to prepare exhaust valve seat.
A composite powder material of preparing high-performance abrasion-proof erosion exhaust valve seat, it by mass percent is: 8～12% Mo, 4～8% Ni, 0.5～2.5% Cr, 1～3% V, 0～2.5 Cu ,≤1% impurity, surplus Fe composition.
Described Mo, Cr, V add composite powder material with FeMo, FeCr, FeV prealloy powder bodily form formula respectively.
The granularity of described prealloy powder is less than 100 orders.
Described Ni, Cu add composite powder material with High temperature diffusion form.
Above-mentioned composite powder material is prepared the method for exhaust valve seat, comprises following steps:
(1) in composite powder material, add graphite and Zinic stearas, in mixer, fully mix 0.5～1 hour, in the compression moulding of 600～800Mpa pressure; Wherein graphite is 0.5～2.0% of composite powder material quality, and Zinic stearas is 0.5～1.0% of composite powder material quality;
(2), at 1100-1150 DEG C, in ammonia dissolving atmosphere, sintering 0.5～1 hour, obtains exhaust valve seat.
The granularity of described graphite is less than 325 orders, and purity is 95～98%, is shaped as flakey, and its mode that adds is direct interpolation.
The granularity of described Zinic stearas is less than 325 orders, and its mode that adds is direct interpolation.
In sintering atmosphere, the flow of hydrogen is 3.0～5.0L/min, and the flow of nitrogen protection is 4.0～6.0L/min.
Beneficial effect of the present invention is: the density of sintered compact prepared by composite powder material of the present invention is 6.3～6.6g/cm
3, hardness is HRC20～28, can make high-performance abrasion-proof erosion powder metallurgy valve seat without finishing.Method flow of the present invention is simple, with high content of technology, and the exhaust valve seat of preparation is not prone to segregation phenomena, and wear-corrosion resistance is good.
Brief description of the drawings
Fig. 1 is the stereoscan photograph of valve seat high-performance iron base section prealloy powder.
Embodiment
Below in conjunction with accompanying drawing and specific examples, the invention will be further described:
Embodiment 1
A composite powder material of preparing high-performance abrasion-proof erosion exhaust valve seat, its mass percent consists of: Mo:8%, Ni:6%, Cr:1%, V:1.5%, Cu:1%, impurity≤1%, surplus Fe.
The method that composite powder material is prepared exhaust valve seat is:
(1) in composite powder material, add respectively granularity to be less than 325 object graphite and Zinic stearass, graphite is 0.5% of composite powder material quality, Zinic stearas is 0.8% of composite powder material quality, fully mixes 1 hour, in the compression moulding of 600Mpa pressure in three-dimensional material mixer.
(2) at 1120 DEG C, sintering 0.5 hour in ammonia dissolving atmosphere, in sintering atmosphere, the flow of hydrogen is 3.0L/min, the flow of nitrogen protection is 4.0L/min, can make high-performance abrasion-proof erosion powder metallurgy exhaust valve seat without finishing.
Fig. 1 is high-performance abrasion-proof erosion exhaust valve seat metallograph prepared by the present embodiment, and the distribution mutually of sintered compact is more even as seen from Figure 1, mainly contains ferrite, perlite, martensite and some polycrystalline tissues.
Adopt international detection method: the density of sintered compact is 6.35g/cm
3, hardness is HRC20.2
Embodiment 2
A composite powder material of preparing high-performance abrasion-proof erosion exhaust valve seat, its mass percent consists of: Mo:10%, Ni:6%, Cr:1%, V:1.5%, Cu:1%, impurity≤1%, surplus Fe.
The method that composite powder material is prepared exhaust valve seat is:
(1) in composite powder material, add respectively granularity to be less than 325 object graphite and Zinic stearass, wherein graphite graphite is 1% of composite powder material quality, Zinic stearas graphite is 0.8% of composite powder material quality, in three-dimensional material mixer, fully mix 1 hour, in the compression moulding of 600Mpa pressure.
(2) at 1120 DEG C, sintering 0.5 hour in ammonia dissolving atmosphere, exhaust valve seat can be put sintering according to sintering demand multilayer, and in sintering atmosphere, the flow of hydrogen is 3.0L/min, and the flow of nitrogen protection is 4.0L/min.Can make high-performance abrasion-proof erosion powder metallurgy exhaust valve seat without finishing.
Adopt international detection method: the density of sintered compact is 6.31g/cm
3, hardness is HRC22.5.
Embodiment 3
A composite powder material of preparing high-performance abrasion-proof erosion exhaust valve seat, its mass percent consists of: Mo:10%, Ni:6%, Cr:1%, V:1.5%, Cu:1%, impurity≤1%, surplus Fe.
The method that composite powder material is prepared exhaust valve seat is:
(1) in composite powder material, add respectively granularity to be less than 325 object graphite and Zinic stearass, wherein graphite graphite is 1.5% of composite powder material quality, Zinic stearas graphite is 0.8% of composite powder material quality, in three-dimensional material mixer, fully mix 1 hour, in the compression moulding of 700Mpa pressure.
(2) at 1120 DEG C, sintering 0.5 hour in ammonia dissolving atmosphere, exhaust valve seat can be put sintering according to sintering demand multilayer, and in sintering atmosphere, the flow of hydrogen is 3.0L/min, and the flow of nitrogen protection is 4.0L/min.Can make high-performance abrasion-proof erosion powder metallurgy valve seat without finishing.
Adopt international detection method: the density of sintered compact is 6.56g/cm
3, hardness is HRC24.6.
Claims (8)
1. a composite powder material of preparing high-performance abrasion-proof erosion exhaust valve seat, is characterized in that, it by mass percent is: 8～12% Mo, 4～8% Ni, 0.5～2.5% Cr, 1～3% V, 0～2.5 Cu ,≤1% impurity, surplus Fe composition.
2. composite powder material according to claim 1, is characterized in that, described Mo, Cr, V add composite powder material with FeMo, FeCr, FeV prealloy powder bodily form formula respectively.
3. composite powder material according to claim 2, is characterized in that, the granularity of described prealloy powder is less than 100 orders.
4. composite powder material according to claim 1, is characterized in that, Ni, Cu add composite powder material with High temperature diffusion form.
5. utilize composite powder material described in claim 1 to prepare the method for exhaust valve seat, it is characterized in that, comprise following steps:
(1) in composite powder material, add graphite and Zinic stearas, in mixer, fully mix 0.5～1 hour, in the compression moulding of 600～800Mpa pressure; Wherein graphite is 0.5～2.0% of composite powder material quality, and Zinic stearas is 0.5～1.0% of composite powder material quality;
(2), at 1100-1150 DEG C, in ammonia dissolving atmosphere, sintering 0.5～1 hour, obtains exhaust valve seat.
6. the method for preparing exhaust valve seat according to claim 5, is characterized in that, the granularity of described graphite is less than 325 orders, and purity is 95～98%, is shaped as flakey, and its mode that adds is direct interpolation.
7. the method for preparing exhaust valve seat according to claim 5, is characterized in that, the granularity of described Zinic stearas is less than 325 orders, and its mode that adds is direct interpolation.
8. the method for preparing exhaust valve seat according to claim 5, is characterized in that, in sintering atmosphere, the flow of hydrogen is 3.0～5.0L/min, and the flow of nitrogen protection is 4.0～6.0L/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210558623.1A CN103882325A (en) | 2012-12-20 | 2012-12-20 | Composite powder material for making high-performance abrasion resistant exhaust valve seat, and its application |
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| CN201210558623.1A CN103882325A (en) | 2012-12-20 | 2012-12-20 | Composite powder material for making high-performance abrasion resistant exhaust valve seat, and its application |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384505A (en) * | 2014-10-30 | 2015-03-04 | 扬州立德粉末冶金股份有限公司 | Powder metallurgy iron-based high-damping absorber valve seat and preparation method thereof |
| CN104588661A (en) * | 2014-11-28 | 2015-05-06 | 安徽长城输送机械制造有限公司 | Preparation technology of automobile engine valve seat ring |
| CN107900326A (en) * | 2017-11-23 | 2018-04-13 | 安徽金亿新材料股份有限公司 | A kind of high-performance abrasion-proof valve retainer material |
| CN110914009A (en) * | 2017-10-30 | 2020-03-24 | 帝伯爱尔株式会社 | Valve guide tube made of iron-based sintered alloy and method for producing same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58224154A (en) * | 1982-06-21 | 1983-12-26 | Mitsubishi Metal Corp | Sintered fe alloy for valve seat of internal combustion engine |
| CN1566392A (en) * | 2003-06-24 | 2005-01-19 | 合肥工业大学 | Reinforced iron-base alloy and method for preparing same |
| CN102101174A (en) * | 2009-12-16 | 2011-06-22 | 鞍钢重型机械有限责任公司 | Water atomization diffusion alloy powder and preparation method thereof |
-
2012
- 2012-12-20 CN CN201210558623.1A patent/CN103882325A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58224154A (en) * | 1982-06-21 | 1983-12-26 | Mitsubishi Metal Corp | Sintered fe alloy for valve seat of internal combustion engine |
| CN1566392A (en) * | 2003-06-24 | 2005-01-19 | 合肥工业大学 | Reinforced iron-base alloy and method for preparing same |
| CN102101174A (en) * | 2009-12-16 | 2011-06-22 | 鞍钢重型机械有限责任公司 | Water atomization diffusion alloy powder and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384505A (en) * | 2014-10-30 | 2015-03-04 | 扬州立德粉末冶金股份有限公司 | Powder metallurgy iron-based high-damping absorber valve seat and preparation method thereof |
| CN104588661A (en) * | 2014-11-28 | 2015-05-06 | 安徽长城输送机械制造有限公司 | Preparation technology of automobile engine valve seat ring |
| CN110914009A (en) * | 2017-10-30 | 2020-03-24 | 帝伯爱尔株式会社 | Valve guide tube made of iron-based sintered alloy and method for producing same |
| CN110914009B (en) * | 2017-10-30 | 2021-03-05 | 帝伯爱尔株式会社 | Valve guide tube made of iron-based sintered alloy and method for producing same |
| US11951547B2 (en) | 2017-10-30 | 2024-04-09 | Tpr Co., Ltd. | Valve guide made of iron-based sintered alloy and method of producing same |
| CN107900326A (en) * | 2017-11-23 | 2018-04-13 | 安徽金亿新材料股份有限公司 | A kind of high-performance abrasion-proof valve retainer material |
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Application publication date: 20140625 |