CN101838752B - Method for preparing iron aluminum intermetallic compound homogenizing cellular material by utilizing powder raw materials - Google Patents
Method for preparing iron aluminum intermetallic compound homogenizing cellular material by utilizing powder raw materials Download PDFInfo
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- CN101838752B CN101838752B CN2009100742015A CN200910074201A CN101838752B CN 101838752 B CN101838752 B CN 101838752B CN 2009100742015 A CN2009100742015 A CN 2009100742015A CN 200910074201 A CN200910074201 A CN 200910074201A CN 101838752 B CN101838752 B CN 101838752B
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Abstract
The invention relates to a method for preparing an iron aluminum intermetallic compound homogenizing cellular material by utilizing powder raw materials. The method is directly used for producing cellular materials based on iron aluminum intermetallic compound or filter elements. The method of the invention comprises the following steps: evenly mixing 86-41% of iron powder and 14-59% of aluminum powder by weight, wherein the powder granularity is less than 500 mu m; adopting isostatic pressing or die forming; and sintering under antioxidant protective atmosphere or vacuum, wherein the key of the method lies in carrying out heating pretreatment on the mixed powder of iron and aluminum before forming; and the technological condition of the pretreatment working procedure is that the mixed powder of iron and aluminum is heated to 400-950 DEG C under antioxidant protective atmosphere or vacuum, is naturally cooled, smashed and ground, and then is sintered.
Description
Technical field
Present method relates to the method for utilizing dusty raw materials to make the iron aluminum intermetallic compound homogenizing porous material.Be improvements over the prior art.
Technical background
The method for preparing ferro-aluminum alloy porous material is the problem that present extremely people pays close attention to.Particularly along with the modernization industry of present high speed development, the energy dissipation and the environmental pollution that bring are more and more serious.A large amount of dust-laden high-temperature gases, coal gas, combustion gas, flue gas have formed the threat to human survival.The high pollution industry, iron and steel, thermoelectricity, stove of all kinds form main source of pollution.Used traditional technology and equipment in the purification filtering that improvement is polluted and dust collecting process or the system, the restriction that is subjected to material behavior can not adapt to energy-saving and cost-reducing situation requirement fully.Solve high performance porous material and cause the attention of scientific circles already.The research of iron-aluminum based metal compound microporous filter material has become the research object of concern.The FeAI base intermetallic compound is owing to its good thermotolerance, good mechanical property and excellent high-temperature oxidation resistant and kinds of anti-sulfur corrosion performance have been subjected to countries in the world investigation of materials worker's more concern and applied research in recent years.Particularly to the dedusting of high temperature dust direct purification not only can save environment protection cost and also for the development in save energy and recycling economy field very important.
The key that exists at present in the prior art not only needs the high-performance filtering material, and what more need is when producing reliable and stable performance, to have simple production process and economical and practical production cost.There are problems such as heat-shock resistance is bad, reliability is not high in later stage nineteen nineties at ceramic filter material, and some countries of west have carried out the research and development of the porous filter material with metalline.FeAI alloy material resistance to high temperature oxidation, sulfur corrosion resistant performance are given prominence to, and are fit to the application of high-temperature dust removal environment, have caused extensive concern in iron and steel, power generation system, have carried out the further investigation to the FeAI alloy.
Two operational paths have been basically formed in the result of study prior art.One is vacuum melting iron aluminum powder, stepped mixing, the cold-press moulding of Beijing AT﹠M, the method for high temperature sintering.One is directly to mix after the iron aluminium powder classification of Central South University, and cold-press moulding, insulation are handled, high temperature sintering.The final porous material that forms with metallic character.Adopt metal powder material directly to obtain required vesicular structure and can solve the roughing problem.Former approach produce the product strength height, high temperature oxidation resistance and kinds of anti-sulfur corrosion excellent performance, filtration efficiency height, running resistance are low, process stabilizing, to be easy to blowback cleaning and regeneration, life-span long.The iron-aluminum based metal compound microporous filter material has the possibility of practical application.But need be in producing by carrying out melting in the vacuum induction furnace, adopt hydraulic atomized powder process to cause complex manufacturing, cost-effective rate low.Limited the Application Areas of material greatly.The technical scheme of Central South University has adopted low-cost iron aluminium powder raw material directly to be mixed and calm has been pressed into shape, and technology simply makes practicality.But, test discovery in service, process in aluminium element diffusion in ferro element group is an exothermic process fast, not only can be formed with the hole of using value, also be easy to form interlock type reaction diffusion and cause local hole expansion to form crackle, form surperficial cracking and inner flaw.Also may cause tangible deformation and hole inhomogeneous.The result who is caused is difficult quality control, yield rate is low excessively, surface quality differs to.Just showed above phenomenon in the accompanying drawing 2 among the application.This technological deficiency has caused the uncontrollable factor of quality product.In order to overcome above technological deficiency, have to limit iron powder and and the size of aluminium powder, the speed that temperature rises when slowing down sintering.Even so also can't thoroughly solve the stability of quality product.Strengthen production cost, formed the quality and the price obstacle of maximum in applying.
Summary of the invention
The purpose of this invention is to provide a new dusty raw materials that utilizes and make the method for iron aluminum intermetallic compound homogenizing porous material.This method is to existing processes: after the components by weight percent ratio mixing of powder according to design with the iron content aluminium component, at first make sheet or shaping base by means of the die forming operation, pressure-controlling is at 50～300MPa, or adopt isostatic cool pressing to prepare tubular parison, behind the insulation homogeneous, adopt slow intensification non-pressure sintering technology again, under 950～1250 ℃, finish sintering, atmosphere is hydrogen or cracked ammonium, perhaps adopt vacuum sintering to realize the typing of vesicular structure, the significant improvement of being carried out, it is the defective that overcomes prior art, break away from quality, the puzzlement that raw material and scrap rate are high is with simply, efficiently, technique means realizes the key of the production of ferro-aluminum alloy porous material cheaply.
In the technical scheme that present method adopted; powder comprises that granularity is not more than iron powder and the aluminium powder of 500 μ m; according to weight percent 86-41%Fe and 14～59%Al uniform mixing; employing waits static pressure or die forming; sintering under oxidation resistant protective atmosphere or the vacuum, crucial process modification is that present method mixed powder to iron powder and aluminium powder before shaping has carried out the heat pre-treatment operation.
More than said heat pre-treatment operation be meant that iron, aluminium base plinth raw material carried out before shaping.Why at first carry out the preheating pre-treatment, be and make to fulfil ahead of schedule between iron powder and aluminium powder to produce the heat reaction process by preheating before being shaped.In this process, FeAl
2, Fe
2Al
5, FeAl
3Experienced the process that spreads between iron aluminium, finished thermopositive reaction the fierce stage, realized the mixed style of iron and above ferro-aluminium.Newly-generated intermediate product is the mixture of iron and iron aluminide, and has discharged potential in pre-warmed process.Threaten in the operation of sintering typing and weakened widely, the basis that produces the body defective is limited in the minimum category, thereby has guaranteed that quality helps the production process of later realization homogeneous.Because above measure also no longer needs strict particle size restrictions as the basic raw material particle of participating in reaction, help greatly reducing cost simultaneously,, adapt to the needs in market widely to generate the ferro-aluminum alloy porous material of various class, specification.The above is the positively effect that the present invention produces.
Description of drawings
Fig. 1 adopts the product sample piece mode of appearance photo of method manufacturing of the present invention.
Fig. 2 has identical iron, al composition content with Fig. 1 sample, the product sample piece mode of appearance photo that adopts existing processing method to produce.
The product design standard that this method is made is carefully and neatly done, without any distortion and moire. Use existing process, do not add any special processing outward appearance gross distortion, serious segmentation crack occurs.
Further specify below in conjunction with specific embodiment and the objective of the invention is how to realize:
Embodiment
Specific embodiment tabulation 0:(is according to weight percent)
| Embodiment | The Fe powder | The Al powder |
| A | 86 | 14 |
| B | 62 | 38 |
| C | 52 | 48 |
| D | 41 | 59 |
Concrete grammar or flow process should comprise following method steps: powder comprises that granularity is not more than iron powder and the aluminium powder of 500 μ m; according to weight percent 86-41%Fe and 14～59%Al uniform mixing; employing waits static pressure or die forming; sintering under oxidation resistant protective atmosphere or the vacuum, key are that present method mixed powder to iron powder and aluminium powder before shaping has carried out the heat pre-treatment operation.
Basic raw material before great key point is to be shaped is aluminium and iron powder.Directly mixing press molding is unsurmountable defective in original technology.Iron aluminum feedstock after the shaping does not generate stable morphology.The formation of the alloy attitude of any point all is beginnings of interlock type thermopositive reaction in the typing sintering circuit afterwards.The exothermic process of vigorous reaction causes the quickening of speed of response and the expansion of local volume, is very easy to cause blank to form cracking at reaction initial point place or causes distortion, caused scrapping of product.In Figure of description 2, provided the product photo that processes according to prior art.Clearly show existing technological deficiency.
More than the processing condition of the heat pre-treatment operation of powder mix before unshaped of said iron powder and aluminium powder be the mixed powder of iron powder and aluminium powder to be heated to 400-950 ℃, naturally cooling under the anti-oxidation protection atmosphere or under the vacuum.
Above primary condition can guarantee that the powder mix of iron powder and aluminium powder passes through 400-950 ℃ the processing that preheats, and has finished the design requirements in the object of the invention, has discharged to cause body outward appearance and the ruined potential energy of voidage homogeneous.The phenomenon that can occur partially sintering in the compound can be resolved by following further processing.
Comprise also in the above iron powder and the heat pre-treatment operation of mixed powder before shaping of aluminium powder that cooled compound is carried out crushing grinding to be handled, and is formed with the mixture that is beneficial to shaping.
To static pressure or die forming such as employing again behind above mixed powder heat pre-treatment and the crushing grinding, compacting pressure is 50-250MPa.Work in-process Deng static pressure or die forming adopt sintering under anti-oxidation protection atmosphere or the vacuum, and sintering temperature is 950-1280 ℃, naturally cooling behind the sintering.
More than said utilize the said mixture that is used to be shaped in the method that dusty raw materials makes the iron aluminum intermetallic compound homogenizing porous material fully can be directly to be not more than Fe powder and the iron aluminide powder of 500 μ m with particle diameter directly alternative.
Provide specific embodiments of the invention below.See following tabulation:
Embodiment table 1 (following component is according to weight percent)
| Embodiment | Fe | FeAl 2 |
| 1 | 71.8 | 28.2 |
| 2 | 52 | 48 |
| 3 | 34 | 66 |
| 4 | 3.8 | 96.2 |
Embodiment table 2 (following component is according to weight percent)
| Embodiment | Fe | Fe 2Al 5 |
| 5 | 74.7 | 25.3 |
| 6 | 55.5 | 44.5 |
| 7 | 37 | 63 |
| 8 | 14.6 | 85.4 |
Embodiment table 3 (weight percent)
| Embodiment | Fe | FeAl 3 |
| 9 | 76.6 | 23.4 |
| 10 | 57.5 | 42.5 |
| 11 | 39 | 61 |
| 12 | 16.7 | 83.3 |
Embodiment table 4 (weight percent)
| Embodiment | Fe | FeAl 2 | Fe 2Al 5 |
| 13 | 72 | 14 | 14 |
| 14 | 53 | 22 | 25 |
| 15 | 35 | 32 | 33 |
| 16 | 11 | 34 | 55 |
Embodiment table 5 (weight percent)
| Embodiment | Fe | FeAl 2 | FeAl 3 |
| 17 | 74 | 13 | 13 |
| 18 | 54 | 22 | 24 |
| 19 | 37 | 31 | 32 |
| 20 | 12 | 34 | 54 |
Embodiment table 6 (weight percent)
| Embodiment | Fe | Fe 2Al 5 | FeAl 3 |
| 21 | 75 | 13 | 15 |
| 22 | 56 | 22 | 22 |
| 23 | 38 | 31 | 31 |
| 24 | 15 | 51 | 34 |
Embodiment table 6 (weight percent)
| Embodiment | Fe | FeAl 2 | Fe 2Al 5 | FeAl 3 |
| 25 | 73 | 9 | 9 | 9 |
| 26 | 55 | 15 | 15 | 15 |
| 27 | 37 | 21 | 21 | 21 |
| 28 | 13 | 29 | 29 | 29 |
| 29 | 55 | 20 | 15 | 10 |
| 30 | 55 | 5 | 35 | 5 |
With reference to the above described powder of embodiment is Fe powder and FeAl
2During the mixing of powder, Fe powder and FeAl
2The weight percent of powder is: 3.8-71.8%Fe powder, 96.2---28.2%FeAl
2
With reference to the above described powder of embodiment is Fe powder and Fe
2Al
5The mixing of powder, Fe powder and Fe
2Al
5The weight percent of powder is: 14.6-74.7%Fe powder, 85.4-25.3%Fe
2Al
5
With reference to the above described powder of embodiment is Fe powder and FeAl
3The mixing of powder, Fe powder and FeAl
3The weight percent of powder is: 16.7-76.6%Fe powder, 83.3-23.4%FeAl
3
With reference to the above described powder of embodiment is Fe powder and FeAl
2, Fe
2Al
5The mixing of powder, Fe powder and FeAl
2, Fe
2Al
5The weight percent of powder is: 72-11%Fe powder, 14-34%FeAl
2, 14-55%Fe
2Al
5
With reference to the above described powder of embodiment is Fe powder and FeAl
2, FeAl
3The mixing of powder, Fe powder and FeAl
2, FeAl
3The weight percent of powder is: 74-12%Fe powder, 13-34%FeAl
2, 13-54%FeAl
3
With reference to the above described powder of embodiment is Fe powder and Fe
2Al
5, FeAl
3The mixing of powder, Fe powder and Fe
2Al
5, FeAl
3The weight percent of powder is: 75-15%Fe powder, 13-51%Fe
2Al
5, 15-31%FeAl
3
With reference to the above described powder of embodiment is Fe powder and FeAl
2, Fe
2Al
5, FeAl
3The mixing of powder, Fe powder and FeAl
2, Fe
2Al
5, FeAl
3The weight percent of powder is: 73-13%Fe, 5-29%FeAl
2, 9-29%Fe
2Al
5, 9-29%FeAl
3
Claims (9)
1. method of utilizing dusty raw materials to make the iron aluminum intermetallic compound homogenizing porous material; powder comprises that granularity is not more than iron powder and the aluminium powder of 500 μ m; according to weight percent 86-41%Fe and 14～59%Al uniform mixing; employing waits static pressure or die forming; sintering under oxidation resistant protective atmosphere or the vacuum; it is characterized in that present method mixed powder to iron powder and aluminium powder before shaping has carried out the heat pre-treatment operation; the processing condition of heat pre-treatment operation are under anti-oxidation protection atmosphere or the vacuum mixed powder of iron powder and aluminium powder to be heated to 400-950 ℃; naturally cooling; again cooled compound being carried out crushing grinding handles; forming is shaped uses mixture; to static pressure or die forming such as employing again behind mixed powder heat pre-treatment and the crushing grinding; compacting pressure is 50-250MPa; work in-process Deng static pressure or die forming adopt sintering under anti-oxidation protection atmosphere or the vacuum; sintering temperature is 950-1280 ℃, naturally cooling behind the sintering.
2. according to the said method of utilizing dusty raw materials to make the iron aluminum intermetallic compound homogenizing porous material of claim 1, it is characterized in that said shaping directly directly substitutes with Fe powder and the iron aluminide powder that particle diameter is not more than 500 μ m with mixture.
3. according to the said method of utilizing dusty raw materials to make the iron aluminum intermetallic compound homogenizing porous material of claim 2, it is characterized in that above said iron aluminide powder is FeAl
2, or Fe
2Al
5, or FeAl
3, or above any two or three combination.
4. the method for utilizing dusty raw materials to make the iron aluminum intermetallic compound homogenizing porous material according to claim 2, the mixture that it is characterized in that described Fe powder and iron aluminide powder is Fe powder and FeAl
2The combination of powder, weight percent is: 3.8-71.8%Fe powder, 96.2-28.2%FeAl
2
5. the method for utilizing powder material to make the iron aluminum intermetallic compound homogenizing porous material according to claim 2, the mixture that it is characterized in that described Fe powder and iron aluminide powder is Fe powder and Fe
2Al
5The combination of powder, weight percent is: 14.6-74.7%Fe powder, 85.4-25.3%Fe
2Al
5
6. the method for utilizing powder material to make the iron aluminum intermetallic compound homogenizing porous material according to claim 2, the mixture that it is characterized in that described Fe powder and iron aluminide powder is Fe powder and FeAl
3The combination of powder, weight percent is: 16.7-76.6%Fe powder, 83.3-23.4%FeAl
3
7. the method for utilizing powder material to make the iron aluminum intermetallic compound homogenizing porous material according to claim 2, the mixture that it is characterized in that described Fe powder and iron aluminide powder is Fe powder and FeAl
2, Fe
2Al
5The mixing of two kinds of powder, Fe powder and FeAl
2, Fe
2Al
5The weight percent of the combination of two kinds of powder is: 72-11%Fe powder, 14-34%FeAl
2, 14-55%Fe
2Al
5
8. the method for utilizing powder material to make the iron aluminum intermetallic compound homogenizing porous material according to claim 2, the mixing that it is characterized in that described Fe powder and iron aluminide powder is Fe powder and FeAl
2, FeAl
3The mixing of two kinds of powder, Fe powder and FeAl
2, FeAl
3The weight percent of two kinds of powder is: 74-12%Fe powder, 13-34%FeAl
2, 13-54%FeAl
3
9. the method for utilizing powder material to make the iron aluminum intermetallic compound homogenizing porous material according to claim 2, the mixing that it is characterized in that described Fe powder and iron aluminide powder is Fe powder and FeAl
2, Fe
2Al
5, FeAl
3The mixing of three kinds of powder, Fe powder and FeAl
2, Fe
2Al
5, FeAl
3The weight hundred of three kinds of powder mixes is than being: 73-13%Fe, 5-29%FeAl
2, 9-29%Fe
2Al
5, 9-29%FeAl
3
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| CN101838752B true CN101838752B (en) | 2011-10-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359238A (en) * | 2020-11-05 | 2021-02-12 | 佛山市飞成金属制品有限公司 | Porous aluminum alloy preparation process and aluminum alloy super-heat-conduction plate |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361505A (en) * | 2012-12-27 | 2013-10-23 | 华东理工大学 | Preparation method of FeAl-based porous material |
| CN109454231B (en) * | 2018-12-18 | 2021-02-05 | 湖北汽车工业学院 | Preparation method of iron-aluminum-copper alloy microporous filter material |
| CN110125392B (en) * | 2019-06-28 | 2022-02-15 | 安泰环境工程技术有限公司 | High-flux external light Fe-Al intermetallic compound filter element and preparation method thereof |
| CN112853139B (en) * | 2021-01-18 | 2022-04-26 | 武汉理工大学 | Preparation method of iron-aluminum intermetallic compound porous material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403607A (en) * | 2002-08-30 | 2003-03-19 | 中国科学院兰州化学物理研究所 | Prepn of intermetallic Fe-Al compound |
| CN1833750A (en) * | 2006-03-14 | 2006-09-20 | 安泰科技股份有限公司 | Method of preparing iron-aluminum based metal compound microporous filter element, and its application |
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2009
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403607A (en) * | 2002-08-30 | 2003-03-19 | 中国科学院兰州化学物理研究所 | Prepn of intermetallic Fe-Al compound |
| CN1833750A (en) * | 2006-03-14 | 2006-09-20 | 安泰科技股份有限公司 | Method of preparing iron-aluminum based metal compound microporous filter element, and its application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359238A (en) * | 2020-11-05 | 2021-02-12 | 佛山市飞成金属制品有限公司 | Porous aluminum alloy preparation process and aluminum alloy super-heat-conduction plate |
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