Foaming agent, preparation method thereof, and preparation method of aluminum foam

A technology of foaming agent and aluminum melt, which is applied in the preparation of foamed aluminum, the foaming agent for preparing small-pore foamed aluminum and its preparation field, to achieve the effects of reducing the degree of agglomeration, promoting nucleation, and reducing difficulty

Active Publication Date: 2019-08-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a foaming agent and its preparation method, as well as the preparation method of aluminum foam, to solve the dispersion problem of titanium hydride and improve the dispersion state of titanium hydride in aluminum melt

Method used

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  • Foaming agent, preparation method thereof, and preparation method of aluminum foam
  • Foaming agent, preparation method thereof, and preparation method of aluminum foam
  • Foaming agent, preparation method thereof, and preparation method of aluminum foam

Examples

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preparation example Construction

[0013] see figure 1 , the invention provides a kind of preparation method of whipping agent, comprising:

[0014] S1, heat-treating the titanium hydride particles in an oxygen-containing atmosphere to oxidize the surface of the titanium hydride particles; and

[0015] S2, mixing the heat-treated titanium hydride particles and metal particles through ball milling, and breaking the titanium hydride particles.

[0016] The titanium hydride is used as a gas source for the foaming process. The particle size of the titanium hydride particles is preferably less than 150 mesh, more preferably -150 mesh to -400 mesh. In the step S1, the heat treatment temperature is preferably 400°C to 500°C, and the heat treatment time is preferably 1 hour to 8 hours. The oxygen-containing atmosphere is preferably air. Heating the titanium hydride particles in an oxygen-containing atmosphere can form a dense oxide film on the surface of the particles, that is, a titanium dioxide film, thereby dela...

Embodiment 1

[0027] Preparation of foaming agent: Use titanium hydride powder with a particle size of -300 mesh and copper powder with a particle size of -200 mesh as raw materials, first place titanium hydride in air at 500 ° C for 2 hours, and then combine with copper powder according to the following process Parameters for ball milling and mixing: the mass ratio of pretreated titanium hydride to copper powder is 1:1, the mass ratio of balls to materials is 3:1, the speed of the ball mill is 250r / min, and the milling time is 4h. After ball milling, composite particles with broken pretreated titanium hydride discretely distributed on the copper powder matrix are formed in the composite powder. The microscopic appearance of the scanning electron microscope is as follows: figure 2 shown. When this composite powder is used as a foaming agent, it can significantly refine the pore size.

Embodiment 2

[0029]Preparation of aluminum foam with small pore size: the foamed aluminum with small pore size was prepared by using the foaming agent in Example 1. First heat and melt the aluminum ingot in a stainless steel crucible brushed with zinc oxide paint, then adjust the melt temperature to 680°C, add 3wt.% calcium metal particles and stir for 10 minutes to increase the viscosity. After the increase, adjust the melt temperature to At 660°C, add 1wt.% foaming agent and stir for 3 minutes to disperse. After the dispersion is completed, heat-preserve and foam for 5 minutes. After the foaming process is fully carried out, take out the crucible and place it in the air to cool naturally to room temperature. An average pore size of 1mm can be prepared. Small pore aluminum foam with uniform pore structure, such as image 3 shown.

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Abstract

The present invention involves a foam, including pre -treated titanium hydroxide particles and metal particles. The metal particles are evenly mixed with the pre -treated titanium hydroxide particles. The metal particles can wet with the aluminum melt.Titanium particles include titanium hydrogenation and oxide films existed on the surface of titanium hydride.The present invention also involves a preparation method for foaming agents, including the heat treatment of titanium hydroxide particles in the oxygen -containing atmosphere, which oxidize the surface of titanium hydrogenated particles;Titanium particles are broken.The present invention also involves a preparation method for foam aluminum.

Description

technical field [0001] The invention relates to the technical field of preparing foamed aluminum by melt foaming, in particular to a foaming agent for preparing small-pore foamed aluminum, a preparation method thereof, and a preparation method of foamed aluminum. Background technique [0002] Foamed aluminum is an ideal material for structural and functional integration. It has the characteristics of light weight, energy absorption and shock absorption, sound absorption and noise reduction, electromagnetic shielding, heat insulation and environmental protection. It is used in aerospace, automobiles, road traffic, architectural decoration, etc. These fields have broad application prospects. The melt foaming method is one of the mainstream preparation processes for aluminum foam. Its basic principle is to form a cell structure by in-situ decomposition of a foaming agent (usually titanium hydride) in the melt after viscosification treatment to generate gas. At present, the ave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C21/00
CPCC22C1/08C22C21/00C22C1/086
Inventor 李言祥程颖陈祥
Owner TSINGHUA UNIV
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