CN1252299C - Process for cold pressing-solving-vacuum sintering preparation of foamed aluminum - Google Patents
Process for cold pressing-solving-vacuum sintering preparation of foamed aluminum Download PDFInfo
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- CN1252299C CN1252299C CN 200410020384 CN200410020384A CN1252299C CN 1252299 C CN1252299 C CN 1252299C CN 200410020384 CN200410020384 CN 200410020384 CN 200410020384 A CN200410020384 A CN 200410020384A CN 1252299 C CN1252299 C CN 1252299C
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- foamed aluminum
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Abstract
The present invention relates to a preparation method for foamed aluminum by the steps of cold pressing, dissolution and vacuum sintering, which belongs to the preparation technology of the foamed aluminum. The method comprises the following steps: adding 40 to 70 wt% of NaCl pore forming agent with an average grain size of 0.45 to 1.00mm into aluminum powder with a mesh of 180 to 200, and adding 5 wt% of absolute alcohol according to the mass ratio of the aluminum powder to the NaCl for thorough mixing; placing the prepared aluminum powder mixture into a mould and pressing the aluminum powder mixture into blanks under the pressure of 250 to 350MPa; placing the pressed blanks into a water bath at a temperature of 75 to 85 DEG C for dipping to dissolve the NaCl, and repeatedly washing the pressed blanks to remove the residual NaCl by deionized water; putting the pressed blanks into a vacuum furnace for sintering after the NaCl is removed, and keeping a vacuum degree of 1*10<-3> to 1*10<-4> Pa in the vacuum furnace; rising the temperature of the vacuum furnace to 540 to 560 DEG C by controlling a heating rate of 8 to 10 DEG C/min, preserving heat for 2 to 3 H, and cooling down to room temperature to prepare the foamed aluminum. The present invention has the advantages that the technological processes are simple, and the prepared foamed aluminum has a uniform pore size, high intensity hole walls and controllable porosity.
Description
Technical field
The present invention relates to a kind of colding pressing-dissolve-vacuum sintering and prepare the method for foamed aluminium, belong to the technology of preparing of foamed aluminium.
Background technology
Foamed aluminium is a kind of similar foamed ultralight metallic substance, has the function of infiltration, sound absorption and vibration damping.Its preparation method has multiple, mainly contains casting, powder metallurgic method, and sedimentation etc., in these methods, the size in, hole simple owing to powder metallurgic method technology and porosity ratio are easier to control and receive publicity.In powder metallurgy process, the sintering dissolution method is a kind of novel process of making foamed aluminium that grew up in recent years at present.Be by a kind of method of mixing, operation such as pressurization, sintering, dissolving is produced fine-crystal spume aluminium alloy with aluminium powder and filler particles.Have and accurately to control void shape, size and porosity and characteristic distributions etc., have preferable quality price aggregative index.Be the effective ways of producing density foam aluminium in even or the fine perforate of gradient.But weak point is that pore-forming material such as NaCl are to the serious corrosion of aluminum substrate in the sintering process, and the intensity of foamed aluminium is not high behind the sintering.
Summary of the invention
The object of the present invention is to provide a kind of colding pressing-dissolve-vacuum sintering to prepare the method for foamed aluminium, this method preparation technology foamed aluminium intensity simple, preparation is higher, and porosity, pore structure and pore distribution ratio are easier to control.
The present invention is realized that by following technical proposals a kind of colding pressing-dissolve-vacuum sintering prepares the method for foamed aluminium, it is characterized in that comprising following process:
1, in 180～200 purpose aluminium powders, be that 40～70% to add median sizes be the NaCl pore-forming material of 0.45～1.00mm by mass ratio,, and add 5% dehydrated alcohol by the mass ratio of aluminium powder and NaCl and carry out thorough mixing.
2, the above-mentioned mixing aluminium powder for preparing is placed in the mould, under the pressure of 250～350MPa, is pressed into base, then blank is placed 75～85 ℃ of water-bath dippings to cause the NaCl dissolving, remove remaining NaCl with the deionized water repetitive scrubbing again.
3, will go the pressed compact behind the NaCl to place the vacuum oven sintering, keep vacuum tightness 1 * 10 in the stove
-3～1 * 10
-4Pa, the rate of heating of 8-10 ℃/min of control rises to 540～560 ℃ and be incubated 2-3h with furnace temperature. cool to room temperature then with the furnace and make foamed aluminium.
The invention has the advantages that technological process foamed aluminium pore opening simple, that make is even, hole wall intensity high porosity is controlled.
Description of drawings
Fig. 1 is the air hole structure of the foamed aluminium section of invention preparation and the SEM picture of distribution; Fig. 2 is the sintering pattern of foamed aluminium section; Fig. 3 is the metallograph of foamed aluminium hole wall; Fig. 4 is for porosity is 56%, pore size is the compressive stress strain curve of the foamed aluminium of 0.45-0.66mm; Fig. 5 is for porosity is 62%, pore size is the compressive stress strain curve of the foamed aluminium of 0.66-0.90mm.
Embodiment
Example 1. is after 0.45～0.66mm mixes by mass ratio at 1: 1, to add 5% dehydrated alcohol and mix 4h on mixer with 180 purpose aluminium powders and NaCl particle, mixed material is placed in the mould is pressed into 35 * 12.5 * 6.5mm under the pressure of 250MPa
3Band sample, then pressed compact is placed 75-85 ℃ of water dipping to cause the NaCl dissolving, use deionized water wash again.Oven dry is placed in the high vacuum furnace at 540 ℃ of sintering 2h, heats with the speed of 10-15 ℃/min.The porosity of the foamed aluminium that this method prepares is 56%, and bending strength is 21MPa.
(0.45～0.66mm) mixes by mass ratio and to add 5% dehydrated alcohol mixes 4h on mixer example 2. at 1: 1, mixed material is placed on is pressed into φ 20 * 40mm in the mould under the pressure of 350MPa with aluminium powder (180 order) and NaCl particle
3Cylindrical sample, then pressed compact is placed 75～85 ℃ of water dipping to cause the NaCl dissolving, use deionized water wash again.Oven dry is placed in the high vacuum furnace at 550 ℃ of sintering 2h.The porosity of the foamed aluminium that this method prepares is 56%, and the stress-strain curve of its compression performance as shown in Figure 4.
(0.66～0.90mm) mixes by mass ratio and to add 5% dehydrated alcohol mixes 4h on mixer example 3. at 45: 55, mixed material is placed on is pressed into φ 20 * 40mm in the mould under the pressure of 350MPa with aluminium powder (180 order) and NaCl particle
3Cylindrical sample, then pressed compact is placed 75～85 ℃ of water dipping to cause the NaCl dissolving, use deionized water wash again.Oven dry is placed in the high vacuum furnace at 560 ℃ of sintering 2h.The porosity of the foamed aluminium that this method prepares is 62%, and the stress-strain curve of its compression performance as shown in Figure 5.
Claims (1)
1, a kind of colding pressing-dissolve-vacuum sintering prepares the method for foamed aluminium, it is characterized in that comprising following process:
1), in 180～200 purpose aluminium powders, be that 40～70% to add median sizes be the NaCl pore-forming material of 0.45～1.00mm by mass ratio, and add 5% dehydrated alcohol by the mass ratio of aluminium powder and NaCl and carry out thorough mixing;
2), the above-mentioned aluminium powder for preparing is placed in the mould, under the pressure of 250～350MPa, be pressed into base, then pressed compact placed 75～85 ℃ of water-baths dippings to cause the NaCl dissolving, remove remaining NaCl with the deionized water repetitive scrubbing again;
3), will go the pressed compact behind the NaCl to place the vacuum oven sintering, keep vacuum tightness 1 * 10 in the stove
-3～1 * 10
-4Pa, the rate of heating of 8～10 ℃/min of control rises to 540～560 ℃ and be incubated 2～3h with furnace temperature, cools to room temperature then with the furnace and makes foamed aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410020384 CN1252299C (en) | 2004-08-30 | 2004-08-30 | Process for cold pressing-solving-vacuum sintering preparation of foamed aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410020384 CN1252299C (en) | 2004-08-30 | 2004-08-30 | Process for cold pressing-solving-vacuum sintering preparation of foamed aluminum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1603440A CN1603440A (en) | 2005-04-06 |
| CN1252299C true CN1252299C (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410020384 Expired - Fee Related CN1252299C (en) | 2004-08-30 | 2004-08-30 | Process for cold pressing-solving-vacuum sintering preparation of foamed aluminum |
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| CN (1) | CN1252299C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100560761C (en) * | 2007-12-12 | 2009-11-18 | 昆明理工大学 | A kind of preparation method of fine-crystal spume aluminium alloy |
| CN102304638A (en) * | 2011-09-06 | 2012-01-04 | 安徽大学 | Preparation process of small-aperture foamed aluminum with strictly controllable void ratio |
| CN102433468B (en) * | 2011-12-14 | 2013-06-19 | 安徽大学 | Method for improving mechanical property of foamed aluminum by dispersion strengthening |
| CN103143805A (en) * | 2013-03-25 | 2013-06-12 | 哈尔滨工业大学 | Method for relieving residual stress of brazed joint |
| CN109108280A (en) * | 2018-09-26 | 2019-01-01 | 江西理工大学 | A kind of novel foam aluminium and preparation method thereof |
| CN113713767B (en) * | 2021-09-07 | 2023-10-20 | 盐城工学院 | Foamed aluminum modified activated carbon fiber and preparation method thereof |
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2004
- 2004-08-30 CN CN 200410020384 patent/CN1252299C/en not_active Expired - Fee Related
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