阅读说明：本技术 一种全通孔多孔泡沫铝制备方法 (Preparation method of full-through-hole porous foamed aluminum ) 是由 辛鑫 付大为 于 2021-04-02 设计创作，主要内容包括：一种全通孔多孔泡沫铝制备方法,其特点是,包括步骤有：选用铝合金板材、聚醚泡绵填充物；铝合金板材裁剪和表面处理；环氧树脂胶配制；铝合金板表面喷涂环氧树脂胶；喷涂环氧树脂胶铝合金板和填充物聚醚泡绵呈90°依次顺序叠加摆放；固化制成铝合金及填充物复合薄板；切割后的铝合金及填充物复合薄板进行再次表面处理；在铝合金及填充物复合薄板的压合面涂覆铝硅钎焊料；压制后薄板放入钎焊炉内进行处理；出炉后清理；精整压制使其厚度满足设计要求；切割机或激光精裁,制成满足设计尺寸要求的全通孔多孔泡沫铝成品。其制备方法科学合理,简单实用,能够准确调整丝径和孔径几何尺寸,孔径方向性好,效果佳,特别适合散热领域应用,风阻小。(A preparation method of full-through-hole porous foamed aluminum is characterized by comprising the following steps: selecting an aluminum alloy plate and a polyether foam filler; cutting and surface treating an aluminum alloy plate; preparing an epoxy resin adhesive; spraying epoxy resin glue on the surface of the aluminum alloy plate; the sprayed epoxy resin glue aluminum alloy plate and the filler polyether foam are sequentially overlapped at 90 degrees and placed; solidifying to prepare an aluminum alloy and filler composite sheet; carrying out surface treatment again on the cut aluminum alloy and filler composite sheet; coating aluminum-silicon brazing material on the laminating surface of the aluminum alloy and filler composite sheet; placing the pressed sheet into a brazing furnace for treatment; cleaning after discharging; finishing and pressing to enable the thickness of the product to meet design requirements; cutting by a cutting machine or laser to obtain the finished product of the full-through-hole porous foamed aluminum meeting the design size requirement. The preparation method is scientific and reasonable, simple and practical, can accurately adjust the geometric dimensions of the wire diameter and the pore diameter, has good pore diameter directivity and good effect, is particularly suitable for the application in the field of heat dissipation, and has small wind resistance.)

1. A preparation method of full-through-hole porous foamed aluminum is characterized by comprising the following steps:

1) selecting an aluminum alloy plate, wherein the length of the plate is 2.44m, the width of the plate is 1.2m, and the thickness of the aluminum alloy plate is determined according to the wire diameter specified by the product design requirement; the filler is polyether foam 30-110 ppi, and the thickness of the filler is determined according to the aperture of the product design requirement;

2) the aluminum alloy plate is fed according to the length and width requirements of the product, sodium hydroxide aqueous solution is used for degreasing, the molar concentration of sodium hydroxide is 2-3mol/L, the temperature is 50 ℃, hydrochloric acid is added, the hydrochloric acid content is 8%, neutralization reaction is carried out, rinsing is carried out by clear water, air drying is carried out, the bonding surface of the aluminum alloy plate and the polyether foam is napped by a broad-band sander, and the surface roughness Ra is between 15 and 50;

3) preparing epoxy resin adhesive, heating the epoxy resin in water bath at the temperature of 80 ℃, weighing the epoxy resin after the epoxy resin is heated in water bath, uniformly mixing 70% of epoxy resin, 25% of epoxy resin curing agent T31, 5% of dibutyl phthalate and a proper amount of acetone according to mass percentage, and curing for 15 min;

4) uniformly spraying epoxy resin glue on the surface of the aluminum alloy plate, wherein the thickness of a glue layer of the epoxy resin glue is 30-60 mu m;

5) the sprayed epoxy resin glue aluminum alloy plate and the filler polyether foam are overlapped in a staggered mode, and the number of overlapped layers is controlled to be 7 or 8;

6) after stacking, loading the aluminum alloy and filler composite sheet into a tool, loading the load of 0.2-0.8N/cm on the upper surface, locking again, heating the aluminum alloy and filler composite sheet in a constant temperature box to 50 ℃, preserving heat for 8h, and curing to obtain the aluminum alloy and filler composite sheet;

7) carrying out laser cutting or mechanical cutting on the aluminum alloy and filler composite sheet, wherein the cutting width is 2-3 times of the wire diameter size required by product design;

8) carrying out secondary degreasing, alkali washing, acid neutralization, water washing, drying and surface treatment on the cut aluminum alloy and filler composite sheet;

9) coating aluminum-silicon brazing material on the laminating surface of the aluminum alloy and filler composite sheet;

10) taking a plurality of aluminum alloy and filler composite sheets with laminated surfaces coated with aluminum-silicon brazing materials according to the design requirements, and sequentially stacking and placing the next sheet and the previous sheet in a 90-degree sequence, wherein the stacking height is 1-2 times of the design thickness;

11) placing the stacked sheets into a four-column 1500T press by using a special tray, wherein the compression amount is 1/3 of the total stacking height, and the pressure is 0.4-0.5 kN/cm;

12) placing the pressed sheet into a sintering tool for locking, placing the sheet into a brazing furnace, washing the furnace by using argon with purity of 99.999 percent, adjusting the furnace temperature to 60 ℃, starting to heat when the oxygen content in the furnace is less than 10ppm, adjusting the brazing temperature to 620 ℃, the heating speed to 135 ℃/min, preserving the heat for 15min, the cooling speed to 8-15 ℃/min, and the argon flow to 15-25m³ /h；

13) The cooling section is set to three temperature zones, the first temperature zone is 250 ℃, the second temperature zone is 120 ℃, the third temperature zone is 45 ℃, and the flow rate of cooling water is 25-35 m³ H, the tapping temperature is 35-45 ℃;

14) after the carbon is discharged, compressed air with the pressure of 6-8Kg/cm is used for sweeping the carbon deposit, rinsing with clean water, and drying and dehydrating;

15) then, finishing and pressing the thin slices by a press to ensure that the thickness of the thin slices meets the design requirement;

16) cutting by a cutting machine or laser to obtain the finished product of the full-through-hole porous foamed aluminum meeting the design size requirement.

Technical Field

The invention belongs to a preparation method of foamed aluminum, and relates to a preparation method of full-through-hole porous foamed aluminum.

Background

The existing preparation method of foamed aluminum is different from that of the production entity metal, and the preparation method is also different due to different physical states of different metals or alloys in the preparation process. The existing preparation method comprises the following steps: loose powder sintering process, powder metallurgy process, slurry foaming process, hollow sphere sintering process, investment casting process, percolation casting process, vapor deposition process, molten salt electrodeposition process. Due to different preparation methods, the prepared foamed aluminum has a closed-cell structure and an open-cell structure, the foamed aluminum with the closed-cell structure contains a large amount of independent air bubbles, the foamed aluminum with the open-cell structure is a continuous through three-dimensional net, and the foamed aluminum with the open-cell structure is widely applied in the market. The quality problem of the existing method for preparing the foamed aluminum with the open-cell structure is that sodium chloride remains in pores, and the tiny sodium chloride residual particles are wrapped in the pores of the foamed aluminum and are difficult to clean, especially, the sodium chloride with thicker thickness remains and blocks the pores, so that the sodium chloride remains to influence the service function and the service life of the foamed aluminum. The fused salt electrodeposition preparation method has the advantages of high energy consumption, limited geometric dimension, large deformation and high cost.

Disclosure of Invention

The invention aims to substantially improve and innovate the existing aluminum foam preparation method, and provides a scientific, reasonable, simple, practical and good-effect all-through-hole porous aluminum foam preparation method capable of accurately adjusting the wire diameter and the pore diameter geometric dimension.

The purpose of the invention is realized by the following technical scheme: a preparation method of full-through-hole porous foamed aluminum is characterized by comprising the following steps:

1) selecting an aluminum alloy plate, wherein the length of the plate is 2.44m, the width of the plate is 1.2m, and the thickness of the aluminum alloy plate is determined according to the wire diameter specified by the product design requirement; the filler is polyether foam 30-110 ppi, and the thickness of the filler is determined according to the aperture of the product design requirement;

2) the aluminum alloy plate is fed according to the length and width requirements of the product, sodium hydroxide aqueous solution is used for degreasing, the molar concentration of sodium hydroxide is 2-3mol/L, the temperature is 50 ℃, hydrochloric acid is added, the hydrochloric acid content is 8%, neutralization reaction is carried out, rinsing is carried out by clear water, air drying is carried out, the bonding surface of the aluminum alloy plate and the polyether foam is napped by a broad-band sander, and the surface roughness Ra is between 15 and 50;

3) preparing epoxy resin adhesive, heating the epoxy resin in water bath at the temperature of 80 ℃, weighing the epoxy resin after the epoxy resin is heated in water bath, uniformly mixing 70% of epoxy resin, 25% of epoxy resin curing agent T31, 5% of dibutyl phthalate and a proper amount of acetone according to mass percentage, and curing for 15 min;

4) uniformly spraying epoxy resin glue on the surface of the aluminum alloy plate, wherein the thickness of a glue layer of the epoxy resin glue is 30-60 mu m;

5) the sprayed epoxy resin glue aluminum alloy plate and the filler polyether foam are overlapped in a staggered mode, and the number of overlapped layers is controlled to be 7 or 8;

6) after stacking, loading the aluminum alloy and filler composite sheet into a tool, loading the load of 0.2-0.8N/cm on the upper surface, locking again, heating the aluminum alloy and filler composite sheet in a constant temperature box to 50 ℃, preserving heat for 8h, and curing to obtain the aluminum alloy and filler composite sheet;

7) carrying out laser cutting or mechanical cutting on the aluminum alloy and filler composite sheet, wherein the cutting width is 2-3 times of the wire diameter size required by product design;

8) carrying out secondary degreasing, alkali washing, acid neutralization, water washing, drying and surface treatment on the cut aluminum alloy and filler composite sheet;

9) coating aluminum-silicon brazing material on the laminating surface of the aluminum alloy and filler composite sheet;

10) taking a plurality of aluminum alloy and filler composite sheets with laminated surfaces coated with aluminum-silicon brazing materials according to the design requirements, and sequentially stacking and placing the next sheet and the previous sheet in a 90-degree sequence, wherein the stacking height is 1-2 times of the design thickness;

11) placing the stacked sheets into a four-column 1500T press by using a special tray, wherein the compression amount is 1/3 of the total stacking height, and the pressure is 0.4-0.5 kN/cm;

12) placing the pressed sheet into a sintering tool for locking, placing the sheet into a brazing furnace, washing the furnace by using argon with purity of 99.999 percent, adjusting the furnace temperature to 60 ℃, starting to heat when the oxygen content in the furnace is less than 10ppm, adjusting the brazing temperature to 620 ℃, the heating speed to 135 ℃/min, preserving the heat for 15min, the cooling speed to 8-15 ℃/min, and the argon flow to 15-25m³ /h；

13) The cooling section is set to three temperature zones, the first temperature zone is 250 ℃, the second temperature zone is 120 ℃, the third temperature zone is 45 ℃, and the flow rate of cooling water is 25-35 m³ H, the tapping temperature is 35-45 ℃;

14) after the carbon is discharged, compressed air with the pressure of 6-8Kg/cm is used for sweeping the carbon deposit, rinsing with clean water, and drying and dehydrating;

15) then, finishing and pressing the thin slices by a press to ensure that the thickness of the thin slices meets the design requirement;

16) cutting by a cutting machine or laser to obtain the finished product of the full-through-hole porous foamed aluminum meeting the design size requirement.

The invention relates to a preparation method of full-through-hole porous foamed aluminum, which comprises the following steps: selecting an aluminum alloy plate and a polyether foam filler; cutting and surface treating an aluminum alloy plate; preparing an epoxy resin adhesive; spraying epoxy resin glue on the surface of the aluminum alloy plate; the sprayed epoxy resin glue aluminum alloy plate and the filler polyether foam are sequentially overlapped at 90 degrees and placed; solidifying to prepare an aluminum alloy and filler composite sheet; carrying out surface treatment again on the cut aluminum alloy and filler composite sheet; coating aluminum-silicon brazing material on the laminating surface of the aluminum alloy and filler composite sheet; placing the pressed sheet into a brazing furnace for treatment; cleaning after discharging; finishing and pressing to enable the thickness of the product to meet design requirements; the preparation method is scientific, reasonable, simple and practical, can accurately adjust the wire diameter and the aperture geometric dimension, has good aperture directivity and good effect, is particularly suitable for the application in the field of heat dissipation, and has small wind resistance.

Detailed Description

The invention relates to a preparation method of full-through-hole porous foamed aluminum, which comprises the following steps:

1) selecting an aluminum alloy plate, wherein the length of the plate is 2.44m, the width of the plate is 1.2m, and the thickness of the aluminum alloy plate is determined according to the wire diameter specified by the product design requirement; the filler is polyether foam 30-110 ppi, and the thickness of the filler is determined according to the aperture of the product design requirement;

2) the aluminum alloy plate is fed according to the length and width requirements of the product, sodium hydroxide aqueous solution is used for degreasing, the molar concentration of sodium hydroxide is 2-3mol/L, the temperature is 50 ℃, hydrochloric acid is added, the hydrochloric acid content is 8%, neutralization reaction is carried out, rinsing is carried out by clear water, air drying is carried out, the bonding surface of the aluminum alloy plate and the polyether foam is napped by a broad-band sander, and the surface roughness Ra is between 15 and 50;

3) preparing epoxy resin adhesive, heating the epoxy resin in water bath at the temperature of 80 ℃, weighing the epoxy resin after the epoxy resin is heated in water bath, uniformly mixing 70% of epoxy resin, 25% of epoxy resin curing agent T31, 5% of dibutyl phthalate and a proper amount of acetone according to mass percentage, and curing for 15 min;

4) uniformly spraying epoxy resin glue on the surface of the aluminum alloy plate, wherein the thickness of a glue layer of the epoxy resin glue is 30-60 mu m;

5) the sprayed epoxy resin glue aluminum alloy plate and the filler polyether foam are overlapped in a staggered mode, and the number of overlapped layers is controlled to be 7 or 8;

6) after stacking, loading the aluminum alloy and filler composite sheet into a tool, loading the load of 0.2-0.8N/cm on the upper surface, locking again, heating the aluminum alloy and filler composite sheet in a constant temperature box to 50 ℃, preserving heat for 8h, and curing to obtain the aluminum alloy and filler composite sheet;

7) carrying out laser cutting or mechanical cutting on the aluminum alloy and filler composite sheet, wherein the cutting width is 2-3 times of the wire diameter size required by product design;

8) carrying out secondary degreasing, alkali washing, acid neutralization, water washing, drying and surface treatment on the cut aluminum alloy and filler composite sheet;

9) coating aluminum-silicon brazing material on the laminating surface of the aluminum alloy and filler composite sheet;

10) taking a plurality of aluminum alloy and filler composite sheets with laminated surfaces coated with aluminum-silicon brazing materials according to the design requirements, and sequentially stacking and placing the next sheet and the previous sheet in a 90-degree sequence, wherein the stacking height is 1-2 times of the design thickness;

11) placing the stacked sheets into a four-column 1500T press by using a special tray, wherein the compression amount is 1/3 of the total stacking height, and the pressure is 0.4-0.5 kN/cm;

12) placing the pressed sheet into a sintering tool for locking, placing the sheet into a brazing furnace, washing the furnace by using argon with purity of 99.999 percent, adjusting the furnace temperature to 60 ℃, starting to heat when the oxygen content in the furnace is less than 10ppm, adjusting the brazing temperature to 620 ℃, the heating speed to 135 ℃/min, preserving the heat for 15min, the cooling speed to 8-15 ℃/min, and the argon flow to 15-25m³ /h；

13) The cooling section is set to three temperature zones, the first temperature zone is 250 ℃, the second temperature zone is 120 ℃, the third temperature zone is 45 ℃, and the flow rate of cooling water is 25-35 m³ H, the tapping temperature is 35-45 ℃;

14) after the carbon is discharged, compressed air with the pressure of 6-8Kg/cm is used for sweeping the carbon deposit, rinsing with clean water, and drying and dehydrating;

15) then, finishing and pressing the thin slices by a press to ensure that the thickness of the thin slices meets the design requirement;

16) cutting by a cutting machine or laser to obtain the finished product of the full-through-hole porous foamed aluminum meeting the design size requirement.

The preparation method of the full-through-hole porous foamed aluminum in the specific embodiment 1 comprises the following steps:

1) selecting an aluminum alloy plate, wherein the length of the plate is 2.44m, the width of the plate is 1.2m, and the thickness of the aluminum alloy plate is determined according to the wire diameter specified by the product design requirement; the filler is polyether foam 30-110 ppi, and the thickness of the filler is determined according to the aperture of the product design requirement;

2) the aluminum alloy plate is fed according to the length and width requirements of the product, sodium hydroxide aqueous solution is used for degreasing, the molar concentration of sodium hydroxide is 2-3mol/L, the temperature is 50 ℃, hydrochloric acid is added, the hydrochloric acid content is 8%, neutralization reaction is carried out, rinsing is carried out by clear water, air drying is carried out, the bonding surface of the aluminum alloy plate and the polyether foam is napped by a broad-band sander, and the surface roughness Ra is between 15 and 50;

3) preparing epoxy resin adhesive, heating the epoxy resin in water bath at the temperature of 80 ℃, weighing the epoxy resin after the epoxy resin is heated in water bath, uniformly mixing 70% of epoxy resin, 25% of epoxy resin curing agent T31, 5% of dibutyl phthalate and a proper amount of acetone according to mass percentage, and curing for 15 min;

4) uniformly spraying epoxy resin glue on the surface of the aluminum alloy plate, wherein the thickness of a glue layer of the epoxy resin glue is 30 mu m;

5) the sprayed epoxy resin glue aluminum alloy plate and the filler polyether foam are overlapped in a staggered mode, and the number of overlapped layers is controlled to be 7 or 8;

6) after stacking, loading the aluminum alloy and filler composite sheet into a tool, loading the load on the upper surface of the tool by 0.2N/cm, locking, putting the tool into a constant temperature box, heating to 50 ℃, keeping the temperature for 8 hours, and curing to prepare the aluminum alloy and filler composite sheet;

7) carrying out laser cutting or mechanical cutting on the aluminum alloy and filler composite sheet, wherein the cutting width is 2-3 times of the wire diameter size required by product design;

8) performing secondary degreasing, alkali washing, acid neutralization, water washing, drying and surface treatment on the cut aluminum alloy and filler composite sheet by adopting the conventional treatment technology in the field;

9) coating aluminum-silicon brazing material on the laminating surface of the aluminum alloy and filler composite sheet;

10) taking a plurality of aluminum alloy and filler composite sheets with laminated surfaces coated with aluminum-silicon brazing materials according to the design requirements, and sequentially stacking and placing the next sheet and the previous sheet in a 90-degree sequence, wherein the stacking height is 1-2 times of the design thickness;

11) placing the stacked sheets into a four-column 1500T press by using a special tray, wherein the compression amount is 1/3 of the total stacking height, and the pressure is 0.4-0.5 kN/cm;

12) placing the pressed sheet into a sintering tool for locking, placing the sheet into a brazing furnace, washing the furnace by using argon with purity of 99.999 percent, adjusting the furnace temperature to 60 ℃, starting to heat when the oxygen content in the furnace is less than 10ppm, adjusting the brazing temperature to 620 ℃, heating at a speed of 135 ℃/min, keeping the temperature for 15min, cooling at a speed of 8 ℃/min, and setting the flow of the argon to 15m³ /h；

13) The cooling section is set to three temperature zones, the first temperature zone is 250 ℃, the second temperature zone is 120 ℃, the third temperature zone is 45 ℃, and the cooling water flow is 25m³ H, the tapping temperature is 35 ℃;

14) after the carbon is discharged, compressed air with the pressure of 6-8Kg/cm is used for sweeping the carbon deposit, rinsing with clean water, and drying and dehydrating;

15) then, finishing and pressing the thin slices by a press to ensure that the thickness of the thin slices meets the design requirement;

16) cutting by a cutting machine or laser to obtain the finished product of the full-through-hole porous foamed aluminum meeting the design size requirement.

The steps of the preparation method of the full-through-hole porous foamed aluminum in the embodiment 2 are basically the same as those of the embodiment 1, except that 4) epoxy resin glue is uniformly sprayed on the surface of the aluminum alloy plate, and the thickness of the epoxy resin glue layer is 45 mu m; 6) after stacking, loading the upper surface with a load of 0.5N/cm into a tool; 12) the cooling speed is 12 ℃/min, and the argon flow is set to be 20m³ H; 13) cooling water flow 30 m³ H, the tapping temperature is 40 ℃.

The steps of the preparation method of the full-through-hole porous foamed aluminum in the embodiment 3 are basically the same as those of the embodiment 1, except that 4) epoxy resin glue is uniformly sprayed on the surface of the aluminum alloy plate, and the thickness of the epoxy resin glue layer is 60 micrometers; 6) after stacking, loading the upper surface with a load of 0.8N/cm into a tool; 12) the cooling speed is 15 ℃/min, and the argon flow is set to be 25m³ H; 13) cooling water flow rate 35 m³ H, the tapping temperature is 45 ℃.

The materials required by the preparation method of the full-through-hole porous foamed aluminum are easy to obtain and are all commercial products.

1. Aluminum alloy plate, thickness range: 5-0.01mm, and other aluminum materials can be selected according to requirements;

2. fillers, porous foam metal (nickel leftover materials) or plant fiber bodies or porous organic matters (polyester foam and polyether foam);

3. organic glue (epoxy resins) inorganic glue (phosphates);

4. brazing flux, aluminum silicon brazing flux or magnesium activator;

5. sodium hydroxide, hydrochloric acid.

The description of the present invention is not intended to be exhaustive or to limit the scope of the claims, and those skilled in the art will be able to conceive of other substantially equivalent alternatives, without inventive step, based on the teachings of the embodiments of the present invention, within the scope of the present invention.