CN1759960A - Warm processing powdered iron, and preparation method - Google Patents
Warm processing powdered iron, and preparation method Download PDFInfo
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- CN1759960A CN1759960A CN 200510095066 CN200510095066A CN1759960A CN 1759960 A CN1759960 A CN 1759960A CN 200510095066 CN200510095066 CN 200510095066 CN 200510095066 A CN200510095066 A CN 200510095066A CN 1759960 A CN1759960 A CN 1759960A
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Abstract
A warm-pressing iron powder is prepared from reductive iron powder, polar graphite powder, lubricant PEG, adhesive PVP, Ni powder, Cu powder and Mo powder through high-temp reduction of the scales of low-carbon steel to obtain sponge iron, crushing, ball grinding, further reduction, crushing, grinding, sieving to obtain reductive iron powder, adding Ni powder, Cu powder and Mo powder, removing stress by tempering in vacuum or protecting atmosphere, adding PVP, mixing, adding polar graphite powder and PEG, mixing, drying at 50 deg.C, and sieving.
Description
Technical field:
The present invention relates to metal dust moulding temperature and pressure technology, particularly warm-pressing iron powder and preparation method thereof.
Background technology:
The temperature and pressure technology is to make a kind of new method of high-performance powder metallurgy part.It is raw material that present thermal-pressing powder generally adopts atomized iron powder, pre-alloyed processing makes the pre-alloyed iron powder of part through part, add suitable polymeric lubricant, powder knot agent composition temperature and pressure powder again, its price is 3-4 a times of common iron powder ten thousand yuan/ton of 2-3.The weak point that prior art exists is that warm-pressing iron powder employing atomized iron powder is a raw material, and its cost is higher, thereby has limited the Application and Development of a large amount of iron-based powder metallurgy parts of high quality and at a reasonable price; Reduced iron powder is because of its out-of-shape, and loose specific weight is less, make flow of powder in the temperature and pressure process, reset difficulty, interior frictional resistance is big, causes temperature and pressure base density not reach 7.2g/cm
3Usually the graphite powder addition of warm-pressing iron powder interpolation is 0.5%, descends as surpassing the density that then causes the temperature and pressure blank, and this production to high carbon content high rigidity part is a technical barrier.
Summary of the invention:
The present invention is directed to the deficiency that prior art exists, utilize reduced iron powder to be raw material, a kind of warm-pressing iron powder and preparation method thereof cheaply is provided.
The technical scheme that technical solution problem of the present invention is adopted:
The characteristics of warm-pressing iron powder of the present invention are: the basic powder of employing is a reduced iron powder, and additive is by mass percentage: polarity graphite powder (0.5-1.0) %, lubricant PEG (0.3-0.6) %, binding agent PVP (0.15-0.25) %, nickel powder (1-2) %, copper powder (0.5-2) %, molybdenum powder (0-0.5) %.
The chemical analysis of reduced iron powder is Fe＞99%, C＜0.02%, O among the present invention
2＜0.20%, acid non-soluble substance＜0.20%.
The grain shape of reduced iron powder is granular almost spherical among the present invention.
The loose specific weight of reduced iron powder is 2.9-3.2g/cm among the present invention
3
Warm-pressing iron powder preparation method's of the present invention characteristics are to carry out as follows:
A, the steel rolling of adopting mild steel or the sponge iron blocks that hot candied iron scale obtains through high temperature reduction obtain the powder of granular almost spherical behind broken, granulation ball milling, again through smart reduction for the second time, broken, mill, sieve, close and batch obtain required reduced iron powder.
B, nickel powder, copper powder, the molybdenum powder that adding in the reduced iron powder is required are incubated destressing tempering in 2-4 hour in 160 ℃-200 ℃ in vacuum or protective atmosphere.
C, the powder of destressing tempering is added binding agent PVP, mixed 5-10 minute through batch mixer earlier, add polarity graphite powder and lubricant PEG, mixed 5-10 minute again.
D, will mix powder under 50 ℃ of temperature dry 30 minutes, and cross 80 mesh sieves then, screenings is warm-pressing iron powder.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention adopts high temperature reduction and granulation ball milling new technology, obtains the powder of granular almost spherical, makes reduced iron powder can be used for temperature and pressure;
2, the present invention adopts the polarity graphite powder, and because of polarity makes it to strengthen with the adsorptivity of other powder, its interlayer slip ability increases, and the anti-attrition performance increases, and temperature and pressure process powder flowbility is increased, and promotes particle to reset, thereby improves green density; And make the graphite addition be increased to 1% by common 0.5%;
3, warm-pressing iron powder cost of the present invention reduces 40-50% than atomized iron powder, thereby has promoted the Application and Development of a large amount of iron-based powder metallurgy parts of high quality and at a reasonable price.
The specific embodiment:
Warm-pressing iron powder designs its proportioning components according to the properties of product needs.Specifically see Table 1.
Table 1 warm-pressing iron powder each component proportioning table Wt%
| Sequence number | The polarity stone flour | Lubricant PEG | Bonding agent PVP | Nickel powder | Copper powder | Molybdenum powder | Reduced iron powder |
| 1 | 0.5 | 0.6 | 0.15 | 2.0 | 1.0 | 0 | Surplus |
| 2 | 0.8 | 0.4 | 0.20 | 1.5 | 2.0 | 0.5 | Surplus |
| 3 | 0.6 | 0.5 | 0.2 | 1.5 | 1.5 | 0.5 | Surplus |
| 4 | 1.0 | 0.3 | 0.25 | 1.0 | 1.5 | 0.5 | Surplus |
Now explain as follows with regard to various powder and powder process:
The polarity graphite powder is obtained through the polarization processing by the natural flake graphite powder, and its granularity is 40-100um.
Lubricant PEG is a polyethylene glycol, molecular formula HO (CH2CH2O) nH, and because of the n difference, the molecular weight difference, performance difference is also big.
Bonding agent PVP is a polyvinylpyrrolidone, has excellent dissolubility, film forming, complexing power and cementability, will add proper amount of solvent absolute ethyl alcohol or acetone during use.
Metal nickel powder, molybdenum powder, copper powder all adopt-200 order technical pures, join and wherein play alloying action, the intensity of raising sintered part, hardness, wearability etc.
Reduced iron powder is made like this: select few mild steel steel rolling of impurity or hot candied iron scale for use, through operations such as cleaning, magnetic separation, tinning enters high temperature reduction in the tunnel cave, temperature 980-1050 ℃, because reduction temperature is higher, so reduction back sponge iron blocks has an amount of sintering phenomenon.Sponge iron blocks obtains the powder of granular almost spherical behind broken, granulation ball milling, again through smart reduction for the second time, broken, mill, sieve, close and batch obtain required reduced iron powder.The difference of this flouring technology and common process just is high temperature reduction and granulation ball milling.The chemical analysis of the reduced iron powder of making is Fe＞99%, C＜0.02%, O
2＜0.20%, acid non-soluble substance＜0.20%, grain shape are granular almost spherical, and loose specific weight is 2.9-3.2g/cm
3
To go tempering, purpose in 2-4 hour in 160 ℃-200 ℃ insulations in vacuum or protective atmosphere be internal stress in removing these metal dusts with adding required nickel powder, copper powder, molybdenum powder in the reduced iron powder by table 1 ratio requirement.
The powder of destressing tempering is added the binding agent PVP that dilutes through absolute ethyl alcohol, mixed 5-10 minute through batch mixer earlier, treat to add polarity graphite powder and lubricant PEG behind binding agent and the powder mixing, mixed 5-10 minute again.
It is dry under 50 ℃ of temperature to mix powder, crosses 80 mesh sieves then, and screenings is warm-pressing iron powder.
The warm-pressing iron powder of making is at 100-130 ℃, and under the pressing pressure 686Mpa condition, green density is 7.19-7.31g/cm
3
Claims (7)
1, warm-pressing iron powder, it is characterized in that: basic powder is a reduced iron powder, and additive is by mass percentage: polarity graphite powder (0.5-1.0) %, lubricant PEG (0.3-0.6) %, binding agent PVP (0.15-0.25) %, nickel powder (1-2) %, copper powder (0.5-2) %, molybdenum powder (0-0.5) %.
2, warm-pressing iron powder according to claim 1 is characterized in that: the chemical analysis of reduced iron powder is Fe＞99%, C＜0.02%, O
2＜0.20%, acid non-soluble substance＜0.20%.
3, warm-pressing iron powder according to claim 1 and 2 is characterized in that: the grain shape of reduced iron powder is granular almost spherical.
4, warm-pressing iron powder according to claim 1 and 2 is characterized in that: the loose specific weight of reduced iron powder is 3.0-3.2g/cm
3
5, warm-pressing iron powder according to claim 3 is characterized in that: the loose specific weight of reduced iron powder is 3.0-3.2g/cm
3
6, warm-pressing iron powder according to claim 1 is characterized in that: the granularity of polarity graphite powder is 40-100 μ m.
7, the preparation method of the described warm-pressing iron powder of a kind of claim 1 is characterized in that carrying out as follows:
A, the steel rolling of adopting mild steel or the sponge iron blocks that hot candied iron scale obtains through high temperature reduction obtain the powder of granular almost spherical behind broken, granulation ball milling, again through smart reduction for the second time, broken, mill, sieve, close and batch obtain required reduced iron powder;
B, nickel powder, copper powder, the molybdenum powder that adding in the reduced iron powder is required are incubated destressing tempering in 2-4 hour in 160 ℃-200 ℃ in vacuum or protective atmosphere;
C, the powder of destressing tempering is added binding agent PVP, mixed 5-10 minute through batch mixer earlier, add polarity graphite powder and lubricant PEG, mixed 5-10 minute again;
D, will to mix powder dry under 50 ℃ of temperature, crosses 80 mesh sieves then, and screenings is warm-pressing iron powder.
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| CN101524757B (en) * | 2009-04-24 | 2011-09-14 | 马鞍山市华东粉末冶金厂 | Method for producing fly hammer seat by powder metallurgy |
| CN101511509B (en) * | 2006-08-28 | 2012-06-13 | 松下电器产业株式会社 | Metal powder for metal photofabrication and method of metal photofabrication using the same |
| CN102672165A (en) * | 2012-06-07 | 2012-09-19 | 太仓市锦立得粉末冶金有限公司 | Powder metallurgy process |
| CN101468391B (en) * | 2007-12-28 | 2013-01-30 | 鞍钢重型机械有限责任公司 | Mixing method of iron-based powder for powder metallurgy |
| CN102909364A (en) * | 2012-11-14 | 2013-02-06 | 张丽群 | Milling method of metal powder |
| CN103551564A (en) * | 2013-10-25 | 2014-02-05 | 霸州市宏升实业有限公司 | HAK-2 diffusion prealloying Fe-Mo-Cu-Ni powder production process |
| CN104259470A (en) * | 2014-08-07 | 2015-01-07 | 莱芜钢铁集团粉末冶金有限公司 | Production method of low apparent density and high fine powder ratio 100-mesh reduced iron powder |
| CN106825541A (en) * | 2016-12-26 | 2017-06-13 | 有研粉末新材料（北京）有限公司 | A kind of preparation method of bond powders |
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| CN1132711C (en) * | 2001-01-04 | 2003-12-31 | 中南大学 | Method for making warm-pressing iron powder |
| CN1151303C (en) * | 2001-02-20 | 2004-05-26 | 华南理工大学 | Adhesive free thermal-pressing powder and method for making high-density high-strength powder metallurgical parts |
| CN1112457C (en) * | 2001-02-20 | 2003-06-25 | 华南理工大学 | Adhesive free thermal-pressing powder for making high density high-tenacity powder metallurgical parts |
| JP2003171741A (en) * | 2001-12-10 | 2003-06-20 | Kobe Steel Ltd | Iron based powder for warm compacting, and warm compacting method |
| SE0201825D0 (en) * | 2002-06-14 | 2002-06-14 | Hoeganaes Ab | Hot compaction or steel powders |
| CN1208477C (en) * | 2002-11-25 | 2005-06-29 | 莱芜钢铁集团粉末冶金有限公司 | Low apparent density reduction iron powder and its manufacturing method |
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| CN101511509B (en) * | 2006-08-28 | 2012-06-13 | 松下电器产业株式会社 | Metal powder for metal photofabrication and method of metal photofabrication using the same |
| CN101468391B (en) * | 2007-12-28 | 2013-01-30 | 鞍钢重型机械有限责任公司 | Mixing method of iron-based powder for powder metallurgy |
| CN101524757B (en) * | 2009-04-24 | 2011-09-14 | 马鞍山市华东粉末冶金厂 | Method for producing fly hammer seat by powder metallurgy |
| CN101982856A (en) * | 2010-09-21 | 2011-03-02 | 李延军 | Soft magnetic core used in penholder type automobile ignition coil and manufacturing method thereof |
| CN101982856B (en) * | 2010-09-21 | 2012-02-15 | 李延军 | Soft magnetic core used in penholder type automobile ignition coil and manufacturing method thereof |
| CN102672165A (en) * | 2012-06-07 | 2012-09-19 | 太仓市锦立得粉末冶金有限公司 | Powder metallurgy process |
| CN102909364A (en) * | 2012-11-14 | 2013-02-06 | 张丽群 | Milling method of metal powder |
| CN103551564A (en) * | 2013-10-25 | 2014-02-05 | 霸州市宏升实业有限公司 | HAK-2 diffusion prealloying Fe-Mo-Cu-Ni powder production process |
| CN103551564B (en) * | 2013-10-25 | 2015-12-09 | 霸州市宏升实业有限公司 | HAK-2 spreads pre-alloyed Fe-Mo-Cu-Ni powder production technology |
| CN104259470A (en) * | 2014-08-07 | 2015-01-07 | 莱芜钢铁集团粉末冶金有限公司 | Production method of low apparent density and high fine powder ratio 100-mesh reduced iron powder |
| CN106825541A (en) * | 2016-12-26 | 2017-06-13 | 有研粉末新材料（北京）有限公司 | A kind of preparation method of bond powders |
| CN113000847A (en) * | 2021-05-07 | 2021-06-22 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of metal chromium powder for fuel cell bipolar plate |
| CN113000847B (en) * | 2021-05-07 | 2022-11-25 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of metal chromium powder for fuel cell bipolar plate |
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Denomination of invention: Warm processing powdered iron, and preparation method Effective date of registration: 20141021 Granted publication date: 20090114 Pledgee: Huizhou Merchants Bank, Hefei Shuguang Road subbranch Pledgor: Hefei Bolin Advanced Materials Co., Ltd. Registration number: 2014990000875 |
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Date of cancellation: 20151020 Granted publication date: 20090114 Pledgee: Huizhou Merchants Bank, Hefei Shuguang Road subbranch Pledgor: Hefei Bolin Advanced Materials Co., Ltd. Registration number: 2014990000875 |
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Denomination of invention: Warm processing powdered iron, and preparation method Effective date of registration: 20151022 Granted publication date: 20090114 Pledgee: Huizhou Merchants Bank, Hefei Shuguang Road subbranch Pledgor: Hefei Bolin Advanced Materials Co., Ltd. Registration number: 2015990000900 |
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Date of cancellation: 20161010 Granted publication date: 20090114 Pledgee: Huizhou Merchants Bank, Hefei Shuguang Road subbranch Pledgor: Hefei Bolin Advanced Materials Co., Ltd. Registration number: 2015990000900 |
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Address after: 230088, Yulan Road, 16 hi tech Development Zone, Anhui, Hefei Patentee after: HEFEI BOLIN ADVANCE MATERIALS CO., LTD. Address before: No. 008 Shuangfeng Avenue Shuangfeng Economic Development Zone of Hefei City, Anhui province 231131 Patentee before: Hefei Bolin Advanced Materials Co., Ltd. |