CN1057346C - Fe-Cr-Al alloy and its making method - Google Patents
Fe-Cr-Al alloy and its making method Download PDFInfo
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- CN1057346C CN1057346C CN97104028A CN97104028A CN1057346C CN 1057346 C CN1057346 C CN 1057346C CN 97104028 A CN97104028 A CN 97104028A CN 97104028 A CN97104028 A CN 97104028A CN 1057346 C CN1057346 C CN 1057346C
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- powder
- sintering
- aludirome
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- aluminum alloy
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Abstract
The present invention belongs to the field of iron-base alloy and a preparation method thereof. The iron-chromium-aluminum alloy comprises chemical components of the following proportioning: 10 to 30wt% of Cr, 3 to 7wt% of Al, 0.1 to 2 wt% of Al2O3 and balance of Fe. In the preparation method, firstly, iron-chromium-aluminum alloy blanks are prepared by a powder metallurgy method; then, the iron-chromium-aluminum alloy blanks are processed into products; the powder metallurgy method for preparing iron-chromiu-aluminum alloy blanks comprises the following steps: milling, mechanical alloying, shaping and sintering. The iron-chromium-aluminum alloy products prepared by the method have high temperature strength and high oxidation resistance and processing performance, and thus, the iron-chromium-aluminum alloy products have high usage temperature and long service life.
Description
The invention belongs to ferrous alloy and method field of manufacturing thereof.Mainly be applicable to the Aludirome product of making.
Siderochrome aluminium electrical heating alloys resistivity height, light specific gravity, anti-oxidant and impervious carbon ability is strong, and anti-sulphur and various hydrocarbon gas corrosive nature are good, and cheap, and use temperature can reach 1100～1400 ℃.
In the prior art, the Aludirome resistance wire adopts melting, casting, rolling, hot candied technological process of production method always.The Aludirome silk of Sheng Chaning in this way, its main drawback is that hot strength is low, is easy to generate creep strain, and in addition, plasticity, toughness are relatively poor, easily crisp, and after high temperature used, grain growth caused fragility to increase, and work-ing life is short.
For plasticity, toughness and the hot strength that improves the Aludirome silk, developed in the world in recent years with powder metallurgy process and prepared Aludirome base bar (substitute melting, casting), and then rolling and hot candied.(" Industnal Heating " January, 1994 P47～50) have just announced a kind of technology that adopts powder metallurgy process to prepare the Aludirome silk, but in the document, do not report concrete powder metallurgy process technology.
The object of the present invention is to provide a kind of chemical ingredients proportioning and manufacture method thereof of ferrochrome aluminium alloy.
The chemical ingredients proportioning of Aludirome of the present invention is on Fe-Cr-Al mother alloy basis, adds Al
2O
3Powder.Under the powder metallurgy state, Al
2O
3The adding of powder can reach: (1) improves hot strength, and (2) hinder grain growth, and (3) improve resistance of oxidation.But excessive Al
2O
3Can reduce plasticity.
In view of the above, the chemical ingredients proportioning (weight %) of Aludirome of the present invention is:
Cr 10～30%, and Al 3～7%, Al
2O
30.1～2%, surplus is Fe.
Aludirome of the present invention adopts the powder metallurgy manufacture method to produce, and it comprises following operation:
------------rolling---wire drawing of sintering is shaped in mechanical alloying in powder process.
Now that each operation division is as follows:
(1) powder process
At first the chemical ingredients proportioning according to Aludirome is equipped with siderochrome aluminium mother alloy and Al
2O
3, and adopt powder preparation method to make powder.The mother alloy powder can adopt atomization or Mechanical Crushing manufactured, its granularity requirements＜0.351mm, Al
2O
3Granularity requirements＜the 0.038mm of powder.
(2) mechanical alloying
With the siderochrome aluminium mother alloy powder of granularity＜0.351mm and the Al of granularity＜0.038mm
2O
3Powder according to chemical composition proportioning is packed into and is ground in the agitating ball mill, and the proportioning of ball, material (weight) is (10～8): 1, and the ball milling time is 4～20 hours.
(3) be shaped
Ground alloy powder is packed in the soft wet mould, place cold isostatic press to be pressed into blank then, its pressure is 150～200MPa, 1～10 minute dwell time.
(4) sintering
The Aludirome blank of press forming is carried out sintering in sintering oven.Sintering divides following two stages to carry out:
Fs---presintering: 200～300 ℃ of temperature, soaking time 20～30 minutes,
Subordinate phase---sintering: 900～1460 ℃ of temperature, soaking time 100～360 minutes,
After fs finishes, continue heating at once, carry out the sintering of subordinate phase.Whole sintering process is carried out under hydrogen shield.
(5) rolling or forging
The Aludirome blank that sinters can be according to product requirement, adopts rolling or the forging mode is further processed, and can be processed into disk material, bar or sheet material etc.
(6) wire drawing
If need be processed into the Aludirome resistance wire that electrically heated is used, then rolling or forged bar can be made thread product through drawing process.
Have good comprehensive performances and electric heating property according to chemical ingredients of the present invention and the prepared Aludirome goods of manufacture method, as prepared resistance alloy silk, can long term operation under＜1420 ℃ of temperature.
Compared with prior art, the present invention has following advantage:
(1) adopts mechanical alloying method Al
2O
3Particulate dispersion-strengthened Aludirome matrix has improved hot strength and initial melting temperature, thereby can improve use temperature and work-ing life.
(2) because Al
2O
3The disperse of plan grain is distributed in the siderochrome aluminum substrate, can hinder matrix grain effectively and grow up, and can keep away name or reduce and also improve work-ing life because the fragility that grain growth caused is convenient to reprocess and weld.
(3) powder metallurgy FeCrAl alloy surface can form ceramic alumina, improves anti-oxidant, the impervious carbon and the kinds of anti-sulfur corrosion ability of alloy product, thereby also can improve use temperature and work-ing life.
(4) alloying constituent of the present invention is even, and crystal grain is tiny, so the plasticity and the good toughness of the FeCrAl alloy of ratio routine are easy to processing; Simultaneously, composition has guaranteed also that evenly the resistivity of goods etc. evenly, can avoid the too high phenomenon of blowing of temperature that is caused because of local electrical resistance rate height.
(5) Al of disperse
2O
3Particulate can improve the specific resistance of FeCrAl alloy, thereby can improve use power.
Embodiment
According to chemical ingredients proportioning of the present invention and three batches of Aludirome resistance wires of powder metallurgy manufacture method preparation.The concrete chemical ingredients of three batches of alloys is as shown in table 1.FeCrAl mother alloy powder and Al
2O
3The granularity of powder is as shown in table 2.Put into agitating ball mill after the batching together and carry out mechanical alloying, ratio of grinding media to material and milling time are as shown in table 2.Alloy powder after the grinding carries out cold isostatic compaction in batches, carries out sintering subsequently, and its shaping and sintering process parameter are as shown in table 3.Carried out rolling and hot candied behind the sintering.Make the resistance wire of Φ 2mm respectively.And the resistance wire finished product carried out physicals and mechanical property test respectively, its result lists table 4 in.
In order to contrast, adopt the melting and casting method to smelt a stove FeCrAl alloy, also be processed into silk.Its composition and performance have also been listed in the corresponding table.
The chemical ingredients proportioning (weight %) of table 1 embodiment alloy
The powder size of table 2 embodiment alloy and ball milling parameter
Table 3 embodiment alloy cold isostatic compaction and sintering parameter
The physics and the mechanical property of table 4 embodiment resistance alloys squeeze
Claims (3)
1, a kind of Aludirome is characterized in that chemical ingredients proportioning (weight %) is
Cr 10～30%, and Al 3～7%, Al
2O
30.1～2%, surplus is Fe.
2, a kind of manufacture method of Aludirome comprises and adopts earlier powder metallurgy process to prepare the Aludirome blank with raw material powder, and then is processed into goods, it is characterized in that the operation that powder metallurgy process prepares Aludirome is:
(1) powder process
At first be equipped with siderochrome aluminium mother alloy and Al by the described chemical ingredients proportioning of claim 1
2O
3, and adopt powder preparation method to make powder, the granularity requirements＜0.351mm of mother alloy powder, Al
2O
3The granularity of powder is wanted ball＜0.038mm;
(2) mechanical alloying
With the siderochrome aluminium mother alloy powder of granularity＜0.351mm and the Al of granularity＜0.038mm
2O
3Powder according to chemical composition proportioning is packed into and is ground in the agitating ball mill, and the proportioning of ball, material (weight) is (10～8): 1, and the ball milling time is 4～20 hours;
(3) be shaped
Ground alloy powder is packed in the soft wet mould, place cold isostatic press to be pressed into blank then, its pressure is 150～200MPa, 1～10 minute dwell time;
(4) sintering
The blank of press forming is carried out sintering in sintering oven, sintering divides following two stages to carry out:
Fs---presintering: 200～300 ℃ of temperature, soaking time 20～30 minutes,
Subordinate phase---sintering: 900～1460 ℃ of temperature, soaking time 100～360 minutes,
Whole sintering process is carried out under hydrogen shield;
(5) rolling or forging
The Aludirome blank that sinters adopts rolling or the forging mode further is processed into disk material, bar or sheet material;
(6) wire drawing
With rolling or forged bar, make thread product through wire drawing technology.
3, manufacture method according to claim 2 is characterized in that after the agglomerating fs knot, continues heating at once, carries out the subordinate phase sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97104028A CN1057346C (en) | 1997-04-18 | 1997-04-18 | Fe-Cr-Al alloy and its making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97104028A CN1057346C (en) | 1997-04-18 | 1997-04-18 | Fe-Cr-Al alloy and its making method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1167838A CN1167838A (en) | 1997-12-17 |
| CN1057346C true CN1057346C (en) | 2000-10-11 |
Family
ID=5167071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97104028A Expired - Fee Related CN1057346C (en) | 1997-04-18 | 1997-04-18 | Fe-Cr-Al alloy and its making method |
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| Country | Link |
|---|---|
| CN (1) | CN1057346C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102693793B (en) * | 2012-06-04 | 2014-11-19 | 惠州市富济电子材料有限公司 | Heating resistant material, ceramic heating component provided with same, and preparing and application |
| CN102674820B (en) * | 2012-06-04 | 2013-11-27 | 惠州市富济电子材料有限公司 | Insulating material, ceramic heating element containing insulating material, preparation and application |
| CN104561799A (en) * | 2013-10-28 | 2015-04-29 | 丹阳智盛合金有限公司 | Iron-chromium-aluminum alloy machining process |
| CN103938102B (en) * | 2014-05-12 | 2016-08-24 | 盐城市鑫洋电热材料有限公司 | A kind of preparation method of ferrum-chromium-aluminum system multi-element high-resistance electrothermal alloy |
| CN107470625A (en) * | 2017-08-15 | 2017-12-15 | 唐山国丰钢铁有限公司 | A kind of powder metallurgy process for preparing high-purity material |
| CN107937814A (en) * | 2017-12-27 | 2018-04-20 | 洛阳神佳窑业有限公司 | A kind of preparation method of Aludirome |
| CN108468000A (en) * | 2018-07-05 | 2018-08-31 | 赵云飞 | A kind of preparation method of ferrochrome material |
| CN109451605B (en) * | 2018-10-29 | 2021-03-16 | 温州科博达汽车部件有限公司 | Surface treatment method for electric heating belt of preheater |
| CN110814062B (en) * | 2019-11-13 | 2021-06-08 | 北京首钢吉泰安新材料有限公司 | Production method of iron-chromium-aluminum alloy wire |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122841A (en) * | 1994-11-11 | 1996-05-22 | 冶金工业部包头稀土研究院 | Non-brittle Cr-Al-rare earth metal-Fe alloy |
-
1997
- 1997-04-18 CN CN97104028A patent/CN1057346C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122841A (en) * | 1994-11-11 | 1996-05-22 | 冶金工业部包头稀土研究院 | Non-brittle Cr-Al-rare earth metal-Fe alloy |
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| Publication number | Publication date |
|---|---|
| CN1167838A (en) | 1997-12-17 |
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Owner name: ANTAI SCIENCE AND TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: GENERAL RESEARCH INST. OF IRON AND STEEL, MINISTRY OF METALLURGICAL INDUSTRY Effective date: 20071130 |
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