CN102560251A - High-performance powder metallurgy material and manufacturing method thereof - Google Patents
High-performance powder metallurgy material and manufacturing method thereof Download PDFInfo
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- CN102560251A CN102560251A CN2010105798132A CN201010579813A CN102560251A CN 102560251 A CN102560251 A CN 102560251A CN 2010105798132 A CN2010105798132 A CN 2010105798132A CN 201010579813 A CN201010579813 A CN 201010579813A CN 102560251 A CN102560251 A CN 102560251A
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Abstract
The invention relates to a high-performance powder metallurgy material, wherein components of the powder metallurgy material are iron powder, aluminum powder, chromium iron, zinc stearate and graphite powder; a manufacturing method of the high-performance powder metallurgy material comprises the steps of ball-grinding the chromium iron till the particle diameter is 0.3-1 microns; uniformly mixing with other powders according to the proportion; performing ball-grinding in a high-performance ball grinder for 5-15 min, wherein the ball-grinding medium is anhydrous organic liquid; in the invention, Al is added in the main component, so that the performance of the powder metallurgy material is improved; the indoor bending strength is 2500 MPa and the relative density is more than 99.9%; high pressing density can be obtained after cold-pressing (pre-pressing) is maintained for a certain time; the prepared sintered steel has a uniform texture, high strength and plasticity, excellent performances and low cost.
Description
Technical field
The present invention relates to powder metallurgy and make field, especially a kind of high-performance powder metallurgy material and production method thereof.
Background technology
In recent years, the powder metallurgy industry development rapidly.Iron powder; Particularly the demand of alloy iron powder constantly increases along with developing of automobile industry; People are also increasingly high to the performance requriements of iron-based sintered structural part; To the demands for higher performance such as heat-resisting, wear-resisting of strength members such as inlet and outlet gate seat, camshaft, thereby exploitation high-density, HS, high-ductility powder metallurgy structure steel, the Application Areas of widening sintered steel is the present researchdevelopment direction of powder metallurgy.
Iron-based sintering structure steel is maximum, the widest series products of application surface of output in the powder metallurgy industry; Its composition roughly has several kinds: the one, and be main ferrous based powder metallurgical sintered steel with Fe-C; The mechanical property of this type steel is equivalent to plain cast iron; Tensile strength has only 150-200MPa, and the part shape that produces is simple.The 2nd, added alloying elements such as copper, nickel in the iron powder, form Fe-C-Ni, series alloys such as Fe-C-Cu, the mechanical property of sintered steel has reached the level of malleable iron, and tensile strength reaches 400MPa.The 3rd, added key at nickel, copper on the basis, form the sintered steel of Fe-Ni-Cu-Mo, its tensile strength can reach 600MPa.The general intensity of the sintered steel of these several kinds of compositions is not high, and plasticity is very low, and therefore unit elongation has greatly limited its range of application generally at 2%-3%, and Ni, and the price of alloying elements such as Mo is higher, so the cost of parts of preparation is also higher.
Chromium is alloying element commonly used in the forged steel, is the best elements of performance such as the hardening capacity that improves steel, intensity, especially in the high strength structure steel adopt chromium to carry out alloying usually, and price is far below Ni, Mo.But in traditional iron-based powder steel, do not contain the chromium element usually, mainly contain several reasons: the one, the avidity of chromium and oxygen is big, be easy to oxidized, so chromium is difficult to exist with simple substance; The 2nd, chromium is the strong carbide forming element, in steel, is easy to form carbide, so after sintered steel is added at simple substance chromium powder end to, very easily form the segregation of C and Cr in the tissue, influences the homogeneity of structure of steel.Thereby, although chromium to rigidity can improvement good effect is arranged, in powder sintered steel, seldom be used.Sintered steel mainly improves the performance of steel with alloy elements such as nickel, molybdenums at present, and its price is higher, and has the problem of homogenizing.
Summary of the invention
In order to overcome above defective, the technical problem that the present invention will solve is: overcome shortcomings such as low, moulding poor, the price height of the sintered steel intensity of conventional material, propose a kind of HS, low cost, mmaterial that mechanical behavior under high temperature is strong and preparation method thereof.
The technical scheme that the present invention adopted is: a kind of high-performance powder metallurgy material, the composition of this mmaterial are iron powder, aluminium powder, ferrochrome, Zinic stearas, Graphite Powder 99.
According to another preferred embodiment, a kind of high-performance powder metallurgy material comprises that further the staple of said mmaterial is iron powder, aluminium powder, and the per-cent of weight is iron powder 80-70% between said iron powder, the aluminium powder, aluminium powder 20-30%.
According to another preferred embodiment, a kind of high-performance powder metallurgy material comprises that further said mmaterial comprises that also the weight percent of composition is ferrochrome 0.5-2%, Zinic stearas 0.08-0.5%, Graphite Powder 99 0.05%.
According to another preferred embodiment, a kind of high-performance powder metallurgy material comprises that further said ferrochrome is an extra low carbon ferrochromium, and wherein the content of chromium is 50%, and carbon content is 0.06%, and all the other are iron.
The invention still further relates to a kind of high-performance powder metallurgy material production method; This method be at first with ferrochrome through high-energy ball milling to particle diameter in the 0.3-1um scope; Then by composition proportion and other powder uniform mixing; Ball milling 5-15min in high energy ball mill again, ball-milling medium is anhydrous organic liquid.
According to another preferred embodiment; A kind of high-performance powder metallurgy material production method comprises that further this method is that the powder after the mixing and ball milling is proportionally colded pressing; Pressure is 600MPa, pressing speed 150mm/min, and powder keeps 2min behind the 600MPa compacted under; Sintering is under the cracked ammonium protective atmosphere, to carry out, and temperature is 1120 ℃, sintering time 40min.
According to another preferred embodiment, a kind of high-performance powder metallurgy material production method comprises that further said anhydrous organic liquid is absolute ethyl alcohol or sherwood oil.
According to another preferred embodiment, a kind of high-performance powder metallurgy material production method comprises that further high energy ball mill is oscillatory type ball mill, planetary ball mill or stirring ball mill.
The invention has the beneficial effects as follows: in staple, added Al, improved the performance of this mmaterial, its indoor flexural strength can reach 2500MPa, and specific density is greater than 99.9%;
Make full use of the alloying action of chromium to steel, tiny ferrochrome powder mixes the even diffusion that can guarantee alloying element such as chromium in the sintering process with iron powder, aluminium powder, Zinic stearas, Graphite Powder 99; Wherein Zinic stearas plays a part lubricant;
(precompressed) maintenance certain hour of colding pressing can obtain bigger pressed density; Highly-efficient lubricant can guarantee higher sintered density, compares with the cold-rolled sintered steel of routine, the sintered steel homogeneous microstructure of preparation, has HS and plasticity, excellent performance, and cheap.
Embodiment
Combine accompanying drawing and preferred embodiment that the present invention is done further detailed explanation now.These accompanying drawings are the synoptic diagram of simplification, substruction of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
A kind of high-performance powder metallurgy material, the composition of this mmaterial are iron powder, aluminium powder, ferrochrome, Zinic stearas, Graphite Powder 99.Wherein staple is iron powder, aluminium powder, and the per-cent of weight is iron powder 80-70% between said iron powder, the aluminium powder, aluminium powder 20-30%.In staple, added Al, improved the performance of this mmaterial, its indoor flexural strength can reach 2500MPa, and specific density is greater than 99.9%.
Mmaterial comprises that also the weight percent of composition is ferrochrome 0.5-2%, Zinic stearas 0.08-0.5%, Graphite Powder 99 0.05%.Wherein Zinic stearas is to play a part lubricant.
Wherein, ferrochrome is an extra low carbon ferrochromium, and wherein the content of chromium is 50%, and carbon content is 0.06%, and all the other are iron.Make full use of the alloying action of chromium to steel, tiny ferrochrome powder mixes the even diffusion that can guarantee alloying element such as chromium in the sintering process with iron powder, aluminium powder, Zinic stearas, Graphite Powder 99.
A kind of high-performance powder metallurgy material production method; This method be at first with ferrochrome through high-energy ball milling to particle diameter in the 0.3-1um scope; Then by composition proportion and other powder uniform mixing; Ball milling 5-15min in high energy ball mill again, ball-milling medium is anhydrous organic liquid, this anhydrous organic liquid is absolute ethyl alcohol or sherwood oil.High energy ball mill is oscillatory type ball mill, planetary ball mill or stirring ball mill.
This method is that the powder after the mixing and ball milling is proportionally colded pressing, and pressure is 600MPa, pressing speed 150mm/min, and powder keeps 2min behind the 600MPa compacted under; Sintering is under the cracked ammonium protective atmosphere, to carry out, and temperature is 1120 ℃, sintering time 40min.
(precompressed) maintenance certain hour of colding pressing can obtain bigger pressed density; Highly-efficient lubricant can guarantee higher sintered density, compares with the cold-rolled sintered steel of routine, the sintered steel homogeneous microstructure of preparation, has HS and plasticity, excellent performance, and cheap.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification sheets, must confirm its technical scope according to the claim scope.
Claims (8)
1. high-performance powder metallurgy material, it is characterized in that: the composition of this mmaterial is iron powder, aluminium powder, ferrochrome, Zinic stearas, Graphite Powder 99.
2. a kind of high-performance powder metallurgy material according to claim 1 is characterized in that: the staple of said mmaterial is iron powder, aluminium powder, and the per-cent of weight is iron powder 80-70% between said iron powder, the aluminium powder, aluminium powder 20-30%.
3. a kind of high-performance powder metallurgy material according to claim 1 is characterized in that: said mmaterial comprises that also the weight percent of composition is ferrochrome 0.5-2%, Zinic stearas 0.08-0.5%, Graphite Powder 99 0.05%.
4. a kind of high-performance powder metallurgy material according to claim 1 is characterized in that: said ferrochrome is an extra low carbon ferrochromium, and wherein the content of chromium is 50%, and carbon content is 0.06%, and all the other are iron.
5. high-performance powder metallurgy material production method; It is characterized in that: this method be at first with ferrochrome through high-energy ball milling to particle diameter in the 0.3-1um scope; Then by composition proportion and other powder uniform mixing; Ball milling 5-15min in high energy ball mill again, ball-milling medium is anhydrous organic liquid.
6. a kind of high-performance powder metallurgy material production method according to claim 5; It is characterized in that: this method is that the powder after the mixing and ball milling is proportionally colded pressing; Pressure is 600MPa, pressing speed 150mm/min, and powder keeps 2min behind the 600MPa compacted under; Sintering is under the cracked ammonium protective atmosphere, to carry out, and temperature is 1120 ℃, sintering time 40min.
7. a kind of high-performance powder metallurgy material production method according to claim 5 is characterized in that: said anhydrous organic liquid is absolute ethyl alcohol or sherwood oil.
8. a kind of high-performance powder metallurgy material production method according to claim 5 is characterized in that: high energy ball mill is oscillatory type ball mill, planetary ball mill or stirring ball mill.
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| CN2010105798132A CN102560251A (en) | 2010-12-09 | 2010-12-09 | High-performance powder metallurgy material and manufacturing method thereof |
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| CN2010105798132A CN102560251A (en) | 2010-12-09 | 2010-12-09 | High-performance powder metallurgy material and manufacturing method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814495A (en) * | 2012-09-10 | 2012-12-12 | 北京科技大学 | Method for improving iron powder forming property |
| CN106369099A (en) * | 2016-08-31 | 2017-02-01 | 宁波瑞丰汽车零部件有限公司 | Piston valve for motor car damper |
| CN107790732A (en) * | 2016-08-29 | 2018-03-13 | 镇江佳鑫精工设备有限公司 | A kind of ultra-fine ferrochrome preparation method of granules of casting infiltration |
| CN110756814A (en) * | 2018-07-26 | 2020-02-07 | 广东美芝制冷设备有限公司 | Preparation method of copper-free metallurgical material, balance block and compressor |
-
2010
- 2010-12-09 CN CN2010105798132A patent/CN102560251A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814495A (en) * | 2012-09-10 | 2012-12-12 | 北京科技大学 | Method for improving iron powder forming property |
| CN102814495B (en) * | 2012-09-10 | 2014-09-17 | 北京科技大学 | Method for improving iron powder forming property |
| CN107790732A (en) * | 2016-08-29 | 2018-03-13 | 镇江佳鑫精工设备有限公司 | A kind of ultra-fine ferrochrome preparation method of granules of casting infiltration |
| CN106369099A (en) * | 2016-08-31 | 2017-02-01 | 宁波瑞丰汽车零部件有限公司 | Piston valve for motor car damper |
| CN110756814A (en) * | 2018-07-26 | 2020-02-07 | 广东美芝制冷设备有限公司 | Preparation method of copper-free metallurgical material, balance block and compressor |
| CN110756814B (en) * | 2018-07-26 | 2022-08-05 | 广东美芝制冷设备有限公司 | Preparation method of copper-free metallurgical material, balance block and compressor |
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Application publication date: 20120711 |