CN1603030A - Pseudo semisolid thixotropy forming method for high-melting-point alloy - Google Patents
Pseudo semisolid thixotropy forming method for high-melting-point alloy Download PDFInfo
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- CN1603030A CN1603030A CN 03132656 CN03132656A CN1603030A CN 1603030 A CN1603030 A CN 1603030A CN 03132656 CN03132656 CN 03132656 CN 03132656 A CN03132656 A CN 03132656A CN 1603030 A CN1603030 A CN 1603030A
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Abstract
The invention relates to false semi-solid state thixotropy forming method of the high melting point alloy. One high melting point fine powder is uniformly mixed with the other low melting point coarse powder with certain volume ratio (generally is seven to three, six to four). It is formed to semi-solid state semi finished metal by cold and hot pressing. Then the semi finished metal is heated up to the thawing temperature between the low and the high melting point to make it set in the false semi-solid state temperature, or set in the pressure room of the die-casting machine to realize the false semi-solid state thixotropy die casting, or set in the closed type mould to realize false semi-solid state thixotropy die forging.
Description
1, the technical field under the innovation and creation:
Materials Processing Engineering
2, background technology:
The powder forming method is a lot, mainly contains three classes: a class densification process mainly relies on sintering, comprises hot pressed sintering (hot presssintering); HIP sintering (hot isostatic press sintering); Activated sintering (activated sintering); Microwave few outstanding (microwave sintering).Another kind of type, the fine and close main extruding plastic deformation that relies on wherein also is attended by sintering, comprises hot quiet liquid extrusion molding (hot hydrostatic extrusion), and powder coats be shaped (surface coasting forging).The third type mainly relies on rapid solidification, and the self-fluxing nature effect is built up down and is shaped, as powderject shaping (osprey method).
The applicant proposes a kind of brand-new manufacturing process on the existing method basis of research, i.e. the pseudo-semi-solid die casting method of high-melting-point alloy.It has that plastic deformation, liquid phase are tied less concurrently and feature such as rapid solidification, the maximum characteristics of technology: technology is easy, pottery that can the direct forming complexity or high temperature alloy, intermetallic compound product, particularly nano ceramics or nanometer high temperature alloy, intermetallic compound product.
3, summary of the invention:
I) inventive principle
The present invention extends from the semi-solid-state shaping Mechanism Study.Under semi-solid temperature, there is primary phase (being high-melting-point phase---solid phase) in semi solid slurry, with the low melting point that is distributed in crystal boundary (being eutectic phase) mutually, accompanying drawing Figure 1 shows that the microstructure of semisolid of 7A04 (LC4) alloy: primary phase is α and is distributed in the eutectic phase of α around mutually.Under the power effect, eutectic phase is being wrapped up in primary phase α, the filling of flowing, and high pressure solidifies and plastic deformation.The present invention is based on this thinking, if high-melting-point is that a kind of ceramic fine powder is (as Al mutually
2O
3, SiC, AlN, Si
3N
4Deng), or superalloy powder (as Fe, Ni, Cr etc.), or intermetallic compound powder (as TiAl, Ti
3Al etc.).Low melting point is that a kind of metal corase meal is (as Sn, Zn, Al etc.), (went into 8: 2 by certain body branch rate, 7: 3,6: 4), evenly mix, present the low melting point powder that distributes around the high-melting-point powder, when being heated to low melting point powder smelting temperature, uniform powder just presents the semi solid slurry feature, under pressure, produces thixotropic flow, high pressure solidifies and plastic deformation (shown in Figure 2 as accompanying drawing).
Ii) technical process
Technical process accompanying drawing Fig. 3 block representation.
Iii) technological parameter:
1. mix the powder craft parameter:
Mix powder and carry out on the mixed powder machine of drum-type, and use the chromium plating steel ball, it is as shown in the table for technological parameter (with SiC
p):
| Material | Incorporation time (h) | Drum rotation speed (r/min) | Steel ball and powder quality ratio |
| ??20Vol％Al/SiC p??30Vol％Al/SiC p??40Vol％Al/SiC p | ????60 ????75 ????80 | ????????20 ????????30 ????????40 | ??????1∶1 ??????1.25∶1 ??????1.5∶1 |
2. cold-press process parameter:
Adopt unidirectional exerting pressure (perhaps bidirectional pressing) to carry out cold compaction, technological parameter: pressure P=100MPa, dwell time τ=10min.
3. vacuum degassing:
Vacuum can be chosen on demand: 10
-1～10
-5Millimetres of mercury.
4. heat pressing process:
Hot pressing can adopt unidirectional exerting pressure (perhaps bidirectional pressing) to carry out.Hot pressing temperature is lower than the fusion temperature of low melting point powder; Add the heating of thermal recovery gas shield resistance furnace or inductance; Lubricant is chosen, and decides on the product material.
5. secondary remelting technology:
Remelting temperature: should be to be higher than low-melting alloy powder liquidus temperature, its temperature retention time be calculated by the shortest size 10sec/mm according to the big I of blank and is chosen.Its remelting temperature sees the following form:
| Material | Aluminium alloy | Magnesium alloy | Red brass | Tin pewter |
| Remelting temperature, ℃ | ??680～720 | ??620～640 | 420～500 | 250～300 |
6. thixotropic forming
Pseudo-semisolid die forging technological parameter:
● mold temperature:＞400 ℃.
● specific pressure:＞100MPa.
● the dwell time:＞0.5～1.5sec/mm.
● lubricated: the finish aquadag.
Pseudo-semisolid die-casting technological parameter:
● mold temperature: 200～300 ℃.
● specific pressure: 60～100MPa.
● injection speed: 0.5～1.0m/sec.
● filling velocity: 25～40m/sec.
● hold pressure time: 5～10sec.
● lubricated: the finish aquadag.
7. Fa Ming good effect:
The invention good effect shows: i) compare with traditional powder forming sintering, it can be shaped than complicated powder product; Ii) compare with powder injection forming, binding agent is not added in the pseudo-semisolid die casting of powder, need not degreasing, sintering after the shaping yet, and process flow is short; Iii) the pseudo-semisolid die forging of powder is compared with power forging, and not only deformation temperature is low, and deformation force is also low; The iv) pseudo-semi-solid-state shaping of powder, low melting point (liquid phase) can finely be filled in space between refractory grain, after plastic deformation, two kinds of powder closely merge, its product than conventional powder be shaped, powder injection performance height, quality stability is good; V) owing to the grain growth temperature of forming temperature, for the high melting point nm material forming is opened up a new way well below nano powder.
4, the accompanying drawing book is bright:
Below in conjunction with accompanying drawing main contents of the present invention are described.
Fig. 1 be the 7A04 secondary remelting (t=615 ℃, the micro-organization chart under the τ=5min).
In the accompanying drawing, 1. α (Al) phase, 2. eutectic phase.
Fig. 2 be high-melting-point powder particle and low melting point powder particle under pressure, produce thixotropic flow, high pressure solidifies with plastic deformation under micro-structure diagram.
In the accompanying drawing, 1. high-melting-point powder particle, 2. low melting point powder.
Fig. 3 is the process drawing of this manufacturing process.
Fig. 4 is the screw extruder structure chart.
In the accompanying drawing, 1. product, 2. mould, 3. heater, 4. powder, 5. hopper, 6. inlet, 7. rotating driving device, 8. high speed die arrangement, 9. sheared helical, 10. spout
Fig. 5 is Semi-Solid Thixoforming stamp forging mould figure.
In the accompanying drawing, 1. bolt, 2. cope match-plate pattern, 3. convex mould pad, 4. punch, 5. punch pad, 6. bearing pin, 7. slide plate, 8. guide pillar, 9. roller pin, 10. hook plate, 11. hook pins, 12. die, 13. guide pin bushings, 14. die pressing plates, 15. alignment pins, 16. lower bolster, 17. liquid forging, 18. backing plates, 19. push rod, 20. bolts, 21. fovea superior templates
5, application example
Example 1, V
2O
5(nm)+and Sn alloy (μ m), after mixing according to 6: 4, in the funnel 2 in the accompanying drawing 4 of packing into, and send into the high-temperature spiral mixer and be heated to the Sn alloy melting point, be piston with the batch mixing spiral, inject in the compression mod at a high speed by nozzle.This example characteristics, available ready-made equipment, temperature control is not strict, and control easily is shaped.
Example 2, Al2O3 (μ m)+2Al2 aluminium powder (μ m) mix according to 6: 4, and through colding pressing, become base, post bake remelting after the vacuum degassing, hot pressing, carry out the Semi-Solid Thixoforming die forging, die drawing such as accompanying drawing are shown in Figure 5.
Technological parameter:
Post bake temperature:＞700 ℃.
Mold preheating temperature:＞400 ℃.
Specific pressure:＞100MPa.
Dwell time: press 1sec/mm and select.
Lubricated: oil base graphite.
Product is shaped as flanged (FLGD) cup shell.
6, the purpose of innovation and creation and task
Seek a kind of easy, cheap, quick be shaped complicated ceramic objects, high temperature alloy and intermetallic compound product, nano material product, enlarge it and in engineering, use.
Claims (5)
- The present invention requires the legal protection scope:
- 1, high-melting-point fine powder material and low melting point corase meal material by 8: 2,7: 3,6: 4, mix cold pressing+be hot pressed into semisolid blank at 5: 5.
- 2, with the semisolid blank of (1) preparation, carry out the product that pseudo-semisolid die casting or pseudo-semisolid die forging are produced.
- 3,,, 7: 3,6: 4, mix, cold pressing+hot forming nanometer semisolid blank at 5: 5 according to 8: 2 with high melting point nm dusty material and low melting point micron powder.
- 4, with the semisolid blank of (3) preparation, carry out pseudo-semisolid die casting, or the product of pseudo-semisolid die forging production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132656 CN1603030A (en) | 2003-09-30 | 2003-09-30 | Pseudo semisolid thixotropy forming method for high-melting-point alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132656 CN1603030A (en) | 2003-09-30 | 2003-09-30 | Pseudo semisolid thixotropy forming method for high-melting-point alloy |
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| Publication Number | Publication Date |
|---|---|
| CN1603030A true CN1603030A (en) | 2005-04-06 |
Family
ID=34658897
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101439405B (en) * | 2008-12-19 | 2012-09-05 | 江苏技术师范学院 | Magnesium-based composite material and method for forming magnesium-based composite material parts |
| CN103192237A (en) * | 2013-04-19 | 2013-07-10 | 北京科技大学 | Production process of high-toughness high-wear-resistance stainless bearing steel bearing parts |
| CN104561677A (en) * | 2015-01-16 | 2015-04-29 | 河北工业大学 | Intermediate alloy for connecting ceramics and metals |
| CN107075597A (en) * | 2014-11-14 | 2017-08-18 | 谢列兹尼奥夫·马克西姆 | Method for manufacturing effective killer aluminium matrix composite |
| CN108746596A (en) * | 2018-06-29 | 2018-11-06 | 北京梦之墨科技有限公司 | A kind of 3D printing metal material and preparation method thereof and application method |
| CN109108298A (en) * | 2018-09-20 | 2019-01-01 | 宁夏大学 | A kind of preparation method of high tough hierarchical structure metal-base composites |
| CN109434114A (en) * | 2018-10-31 | 2019-03-08 | 北京航空航天大学 | A method of it is shaped for containing volatile cast |
| CN113000842A (en) * | 2021-03-08 | 2021-06-22 | 昆明理工大学 | Method for preparing alloy semi-solid thixotropic blank by continuously extruding simple substance mixed powder |
-
2003
- 2003-09-30 CN CN 03132656 patent/CN1603030A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101439405B (en) * | 2008-12-19 | 2012-09-05 | 江苏技术师范学院 | Magnesium-based composite material and method for forming magnesium-based composite material parts |
| CN103192237A (en) * | 2013-04-19 | 2013-07-10 | 北京科技大学 | Production process of high-toughness high-wear-resistance stainless bearing steel bearing parts |
| CN103192237B (en) * | 2013-04-19 | 2015-05-20 | 北京科技大学 | Production process of high-toughness high-wear-resistance stainless bearing steel bearing parts |
| CN107075597A (en) * | 2014-11-14 | 2017-08-18 | 谢列兹尼奥夫·马克西姆 | Method for manufacturing effective killer aluminium matrix composite |
| CN104561677A (en) * | 2015-01-16 | 2015-04-29 | 河北工业大学 | Intermediate alloy for connecting ceramics and metals |
| CN104561677B (en) * | 2015-01-16 | 2016-06-08 | 河北工业大学 | A kind of Ceramic and metal joining intermediate alloy |
| CN108746596A (en) * | 2018-06-29 | 2018-11-06 | 北京梦之墨科技有限公司 | A kind of 3D printing metal material and preparation method thereof and application method |
| CN108746596B (en) * | 2018-06-29 | 2019-06-11 | 北京梦之墨科技有限公司 | A kind of 3D printing metal material and preparation method thereof and application method |
| CN109108298A (en) * | 2018-09-20 | 2019-01-01 | 宁夏大学 | A kind of preparation method of high tough hierarchical structure metal-base composites |
| CN109108298B (en) * | 2018-09-20 | 2020-03-17 | 宁夏大学 | Preparation method of hierarchical structure metal matrix composite material |
| CN109434114A (en) * | 2018-10-31 | 2019-03-08 | 北京航空航天大学 | A method of it is shaped for containing volatile cast |
| CN113000842A (en) * | 2021-03-08 | 2021-06-22 | 昆明理工大学 | Method for preparing alloy semi-solid thixotropic blank by continuously extruding simple substance mixed powder |
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