CN104357739A - Method for preparing compact ferroaluminium by using spark plasma sintering method - Google Patents
Method for preparing compact ferroaluminium by using spark plasma sintering method Download PDFInfo
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- CN104357739A CN104357739A CN201410739098.2A CN201410739098A CN104357739A CN 104357739 A CN104357739 A CN 104357739A CN 201410739098 A CN201410739098 A CN 201410739098A CN 104357739 A CN104357739 A CN 104357739A
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- aluminium
- ball
- plasma sintering
- powder
- sintering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a method for preparing compact ferroaluminium by using a spark plasma sintering method. The method comprises the following steps: S1, mixing iron powder and aluminum powder; S2, mechanically grinding the mixed powder in an inert atmosphere by using planetary ball-milling equipment; and S3, sintering the ball-milled mixed powder by using the spark plasma sintering method. The prepared ferroaluminium is excellent in mechanical property, and the grain size is 15 microns, the hardness is 1200HV, the compactness is 98.6% and the room-temperature plasticity is 6%. In addition, the method disclosed by the invention is simple in process, easy to operate and good in industrialization prospect.
Description
Technical field
The invention belongs to alloy material preparing technical field, particularly relate to a kind of discharge plasma sintering legal system that utilizes for the method for fine and close ferro-aluminium.
Background technology
Intermetallic Fe-Al compound has erosion resistance in excellent anti-oxidant and sulfuration resistant performance, medium and higher hot strength, and density is low, and not containing expensive alloying elements, cost is lower, is a kind of potential high-temperature structural material.It is of many uses, and has huge potentiality, in space flight, aviation, automotive industry and military field, has application prospect, now above the external shell it being successfully applied to compressor blade and guided missile.
But the reason hindering ferro-aluminium to become the engineering materials with practical value is inductile (elongation 1% ~ 4%) under its room temperature and low Resisting fractre drag, and higher than low hot strength when 600 DEG C and low creep strength.Wherein improve ferro-aluminium temperature-room type plasticity is the focus that ferro-aluminium technical field researcher is paid close attention to always.
Summary of the invention
For prior art Problems existing, the invention provides a kind of discharge plasma sintering legal system that utilizes for the method for fine and close ferro-aluminium, the ferro-aluminium temperature-room type plasticity adopting the method to prepare significantly improves.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Utilize discharge plasma sintering legal system for the method for fine and close ferro-aluminium, comprise step:
Step 1, mixing iron powder and aluminium powder obtain mixed powder, and the mol ratio of iron powder and aluminium powder is 1:(0.34 ~ 0.45);
Step 2, adopt planetary ball mill equipment to carry out mechanical ball milling in an inert atmosphere to mixed powder, ball-milling medium and mixed powder mass ratio are (12 ~ 15): 1, and rotating speed is (150 ~ 200) rev/min, and Ball-milling Time is 25 ~ 50 hours;
Step 3, adopt discharge plasma sintering method to sinter the mixed powder after ball milling, apply the axle pressure of (40 ~ 50) MPa in sintering process, sintering temperature is 800 ~ 1100 DEG C, and sintering time is 10 ~ 15min.
As preferably, above-mentioned iron powder purity >=99.5%, granularity is 40 μm.
As preferably, above-mentioned aluminium powder purity >=99.6%, granularity is 30 μm.
As preferably, above-mentioned ball-milling medium is Stainless Steel Ball.
Discharge plasma sintering is a kind of novel material sintering technology, and its principal feature is the supper-fast densification sintering utilizing body heating and surface active to realize material.Because it has very high thermo-efficiency, can make to be sintered body and reach fine and close within the quickish time, sintering hard-to-sinter material be had to the advantage of its uniqueness.
The present invention utilizes mechanical activation-discharge plasma sintering method (MASPS) to achieve the superfast sintering of ferro-aluminium.First, the mixed powder of high-energy ball milling method to iron powder and aluminium powder is adopted to carry out mechanical activation; Then, discharge plasma sintering method (Spark Plasma Sintering is called for short SPS) is adopted to carry out sintering synthesis to the powder after mechanical activation.
Compared to the prior art, the present invention has following features and beneficial effect:
1, achieve the superfast sintering of ferro-aluminium, and the alloy material that crystal grain is thin, density is high can be prepared, thus ferro-aluminium temperature-room type plasticity is improved.
2, technique simply, easily operates, and has good industrialization prospect.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
Embodiment
The first step: by the aluminium powder of the iron powder of purity >=99.5%, granularity 40 μm and purity >=99.6%, granularity 30 μm by 1:(0.34 ~ 0.45) mol ratio mix.
Second step: adopt frequency conversion type planetary ball mill to carry out mechanical ball milling to mixed powder; ball-milling medium adopts Stainless Steel Ball; mechanical milling process is using argon gas as protective atmosphere; ball-milling medium and mixed powder mass ratio are (12 ~ 15): 1; rotating speed is (150 ~ 200) rev/min, and Ball-milling Time is 25 ~ 50 hours.
3rd step: the mixed powder that activates through ball milling is loaded graphite jig, then be placed in discharge plasma sintering machine and sinter, the axle pressure applying (40 ~ 50) MPa in sintering process is that sintering temperature is 800 ~ 1100 DEG C, and sintering time is 10 ~ 15min.
Ferro-aluminium prepared by the present embodiment has excellent mechanical property, grain fineness number 15 μm, hardness 1200HV, density 98.6%; Temperature-room type plasticity 6%(elongation), and ferro-aluminium temperature-room type plasticity prepared by traditional method is 1% ~ 4%.
Claims (4)
1. utilize discharge plasma sintering legal system for the method for fine and close ferro-aluminium, it is characterized in that, comprise step:
Step 1, mixing iron powder and aluminium powder obtain mixed powder, and the mol ratio of iron powder and aluminium powder is 1:(0.34 ~ 0.45);
Step 2, adopt planetary ball mill equipment to carry out mechanical ball milling in an inert atmosphere to mixed powder, ball-milling medium and mixed powder mass ratio are (12 ~ 15): 1, and rotating speed is (150 ~ 200) rev/min, and Ball-milling Time is 25 ~ 50 hours;
Step 3, adopt discharge plasma sintering method to sinter the mixed powder after ball milling, apply the axle pressure of (40 ~ 50) MPa in sintering process, sintering temperature is 800 ~ 1100 DEG C, and sintering time is 10 ~ 15min.
2. utilize discharge plasma sintering legal system for the method for fine and close ferro-aluminium as claimed in claim 1, it is characterized in that:
Described iron powder purity >=99.5%, granularity is 40 μm.
3. utilize discharge plasma sintering legal system for the method for fine and close ferro-aluminium as claimed in claim 1, it is characterized in that:
Described aluminium powder purity >=99.6%, granularity is 30 μm.
4. utilize discharge plasma sintering legal system for the method for fine and close ferro-aluminium as claimed in claim 1, it is characterized in that:
Described ball-milling medium is Stainless Steel Ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410739098.2A CN104357739A (en) | 2014-12-08 | 2014-12-08 | Method for preparing compact ferroaluminium by using spark plasma sintering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410739098.2A CN104357739A (en) | 2014-12-08 | 2014-12-08 | Method for preparing compact ferroaluminium by using spark plasma sintering method |
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| CN104357739A true CN104357739A (en) | 2015-02-18 |
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| CN201410739098.2A Pending CN104357739A (en) | 2014-12-08 | 2014-12-08 | Method for preparing compact ferroaluminium by using spark plasma sintering method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0734182A (en) * | 1993-07-13 | 1995-02-03 | Tdk Corp | Production of ferrous soft magnetic sintered compact and ferrous soft magnetic sintered compact obtained by the same |
| CN101384387A (en) * | 2006-02-15 | 2009-03-11 | 杰富意钢铁株式会社 | Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body |
| CN103537688A (en) * | 2013-10-11 | 2014-01-29 | 上海大学 | Method for preparing Fe-Al alloy by using nano-powder |
-
2014
- 2014-12-08 CN CN201410739098.2A patent/CN104357739A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0734182A (en) * | 1993-07-13 | 1995-02-03 | Tdk Corp | Production of ferrous soft magnetic sintered compact and ferrous soft magnetic sintered compact obtained by the same |
| CN101384387A (en) * | 2006-02-15 | 2009-03-11 | 杰富意钢铁株式会社 | Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body |
| CN103537688A (en) * | 2013-10-11 | 2014-01-29 | 上海大学 | Method for preparing Fe-Al alloy by using nano-powder |
Non-Patent Citations (5)
| Title |
|---|
| 倪星元等: "《纳米材料制备技术》", 31 October 2007, 化学工业出版社 * |
| 李元元: "《新型材料与科学技术 金属材料卷》", 30 September 2012, 华南理工大学出版社 * |
| 李洪桂: "《冶金原理》", 30 June 2005, 科学出版社 * |
| 王建等: "Fe-Al金属间化合物研究概况与发展方向", 《稀有金属材料与工程》 * |
| 韩跃新: "《粉体工程》", 31 December 2011, 中南大学出版社 * |
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