Method for preparing open pore foamed aluminum through investment casting

A technology of through-hole aluminum foam and investment mold, which is used in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of poor pore penetration rate, easy corrosion, and unsatisfactory fluid distribution effect, etc. Excellent and stable effect

Inactive Publication Date: 2017-05-10
LIAONING RONGDA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has disadvantages such as not uniform pore size and pore structure, poor pore penetration rate, easy corrosion, and large process limitations, and the through-hole foamed aluminum prepared by infiltration casting method has a through-porosity of 60-70%. It is not ideal for heat exchange, fluid filtration, and fluid uniform distribution

Method used

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  • Method for preparing open pore foamed aluminum through investment casting
  • Method for preparing open pore foamed aluminum through investment casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A step, polyurethane sponge investment mold preparation

[0048] Select a three-dimensional polyurethane mesh sponge with a porosity of 97-98% and a pore diameter of 1.45-1.5mm with uniform pores and good connectivity. Put the prepared polyurethane sponge into the automatic spraying machine and adjust the machine to spray the polyurethane paint evenly to the surface of the polyurethane sponge; preheat the heating furnace to 55°C, then put the sprayed polyurethane sponge into the preheated heating furnace, raise the temperature to 110°C at a uniform speed, and keep it warm for 0.5h. Polyurethane sponge knots are not roughened.

[0049] Step B, preparation of plaster model

[0050] Put the polyurethane sponge prepared in step A into the mold, then proportion α-type hemihydrate gypsum according to the mass percentage, gypsum powder: retarder: inorganic binder: water=40:30:10:20, and Stir the gypsum slurry raw materials evenly until there are no air bubbles in the gypsum ...

Embodiment 2

[0060] The polyurethane sponge knot was roughened once, and the rest of the steps and parameters were the same as in Example 1.

[0061] The parameters of the prepared through-hole foamed aluminum are as follows:

[0062] Porosity: 96.2%;

[0063] Average pore diameter: 1.38mm;

[0064] Yield strength: 21.5KPa.

Embodiment 3

[0066] A step, polyurethane sponge investment mold preparation

[0067] Select a three-dimensional polyurethane mesh sponge with a porosity of 97-98% and a pore diameter of 1.45-1.5mm with uniform pores and good connectivity. Put the prepared polyurethane sponge into the automatic spraying machine and adjust the machine to spray the polyurethane paint evenly to the surface of the polyurethane sponge; preheat the heating furnace to 57°C, then put the sprayed polyurethane sponge into the preheated heating furnace, raise the temperature to 115°C at a uniform speed, and keep it warm for 0.7h. The size and strength of the polyurethane structure that meets the requirements can be obtained by roughening the polyurethane sponge twice.

[0068] Step B, preparation of plaster model

[0069] Put the polyurethane sponge prepared in step A into the mold, and then proportion α-type hemihydrate gypsum according to the mass percentage, gypsum powder: retarder: inorganic binder: water=43:30:1...

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Abstract

The invention discloses a method for preparing open pore foamed aluminum, and the open pore foamed aluminum with a specific porosity is obtained through investment casting. The method comprises the steps of preparation of a polymeric sponge fired mold, preparation of a plaster model, injection molding of molten-state aluminum liquid and forming of the open pore foamed aluminum. The expected porosity, aperture and yield strength of the open pore foamed aluminum are controlled and obtained by controlling the frequency of roughening treatment of polymeric sponge. According to the main technical indexes and parameters of the obtained full open pore foamed aluminum, the porosity is larger than 91%, the aperture range is from 0.42 mm to 1.5 mm, and the maximum yield strength can reach 58.6 KPa. The properties of the open pore foamed aluminum are better and more stable by further selectively optimizing the aluminum liquid pouring temperature, plaster model preheating temperature and the vacuum degree.

Description

technical field [0001] The invention relates to the technical field of preparation of through-hole foamed aluminum materials, in particular to a method for preparing through-hole foamed aluminum materials by investment casting. Background technique [0002] Aluminum foam is made by adding additives to pure aluminum or aluminum alloy and undergoing a foaming process, which has both metal and bubble characteristics. It has low density, high impact absorption ability, high temperature resistance, strong fire resistance, corrosion resistance, sound insulation and noise reduction, low thermal conductivity, high electromagnetic shielding, strong weather resistance, filtering ability, easy processing, easy installation, and high forming accuracy , Can carry out surface coating. Aluminum foam belongs to the foam metal foam material, and aluminum foam is roughly divided into through-cell foam aluminum and closed-cell foam aluminum according to the pore structure. [0003] The prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/24C22C1/08
CPCC22C1/08B22C9/04B22C9/24C22C1/081
Inventor 朱德琳崔淮陈明孙琦李昊张庆福
Owner LIAONING RONGDA NEW MATERIALS TECH CO LTD
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