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Coated foaming agent and preparation method thereof and preparation method of foamed aluminum

A foaming agent and coating type technology, which is applied in the field of preparing foamed aluminum by melt foaming, can solve the problems of large foaming pore size, non-uniformity, waste of air source, etc., and achieves delaying foaming time, increasing wettability, Excellent performance

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

[0005] The burning loss of titanium hydride is serious, and the effective consumption is less than 1 / 5 of the total amount added
Since the temperature of the metal melt far exceeds the decomposition temperature of the blowing agent, when titanium hydride is added to the melt, titanium hydride particles will float on the surface of the aluminum melt due to poor wettability between titanium hydride and the aluminum melt. With the vigorous stirring, it can gradually mix with the melt and start to foam. During this period, the ambient temperature near the titanium hydride is always higher than its decomposition temperature, so the titanium hydride will continue to decompose and degas, resulting in serious gas source waste.
[0006] The parameter control window in the preparation process is too small. During the stirring process after adding titanium hydride, the titanium hydride in the melt will be severely burned. After about 4 minutes, the titanium hydride will stop decomposing and the melt will lose its foaming ability. However, if When the stirring time is too short, titanium hydride cannot be completely dispersed in the melt, which will easily cause multiple titanium hydride particles to gather together, resulting in large and uneven foaming pores, which also limits the selection window of titanium hydride particle size (compared to Titanium hydride with small particle size is difficult to completely disperse within 4 minutes), which will affect the quality of the final product
[0007] So far, the existing melt foaming method for preparing foamed aluminum has problems such as serious waste of gas source and difficulty in process control, making it difficult to prepare relatively stable small-pore foamed aluminum

Method used

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  • Coated foaming agent and preparation method thereof and preparation method of foamed aluminum
  • Coated foaming agent and preparation method thereof and preparation method of foamed aluminum
  • Coated foaming agent and preparation method thereof and preparation method of foamed aluminum

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preparation example Construction

[0039] The above-mentioned preparation method of foamed aluminum adopts a new foaming agent. In the new foaming agent, titanium hydride composite particles coated with an oxide layer on the surface of titanium hydride are used as the foaming component. Since the titanium hydride particles are covered with oxide , so that when the foaming agent is added to the melt, it will not decompose immediately, avoiding the problem that titanium hydride is easily burned when it is added to the melt. Covering further delays the foaming time of the foaming agent, and more importantly, the presence of alloys or metals also increases the wettability of the foaming agent and the aluminum melt, so that the foaming agent can be evenly dispersed in the aluminum melt Middle; when the temperature of the aluminum melt reaches the dehydrogenation temperature of titanium hydride, the particles of titanium hydride can stably form uniform small-pore bubbles in the aluminum melt, thereby preparing aluminu...

Embodiment 1

[0071] Preparation of foaming agent: Strictly sieve titanium hydride, select titanium hydride particles of 200-400 mesh, and then obtain titanium hydride composite particles after being kept at 500°C for 2 hours in an air atmosphere, and the titanium hydride composite particles are below 500°C , no decomposition occurs. Then use liquid-solid mixing to mix 5wt% titanium hydride composite particles into the alloy, stir at a speed of 2100r / min at an ambient temperature of less than 500°C for 2 hours, crush and sieve out a foaming agent with a diameter of about 5mm after cooling .

[0072] Preparation of foamed aluminum: heat aluminum to 680°C, melt it, add 3wt% calcium particles, stir for 10 minutes, and then add 5wt% new foaming agent at 660°C, at this time, the addition equivalent of titanium hydride composite particles is aluminum 0.25wt% of the melt, stirred for 5min at 2100r / min, put out the stirring paddle, then kept the temperature for 5min, and cooled with the furnace. ...

Embodiment 2

[0074] Preparation of foaming agent: sieve titanium hydride, select titanium hydride particles with a mesh size of 100-200, and then keep warm at 500° C. for 2 hours in an air atmosphere to obtain titanium hydride composite particles. Then use liquid-solid mixing to mix 5wt% titanium hydride composite particles into the alloy, and use a speed of 2100r / min at a temperature of less than 450-500°C, stir for 2 hours, crush and sieve after cooling to obtain a foaming agent with a diameter of about 5mm .

[0075] Preparation of foamed aluminum: Heat aluminum to 680°C to melt, add 3wt% calcium particles, stir for 10 minutes, then add 10wt% new foaming agent at 660°C, at this time, the addition of titanium hydride is equivalent to that of aluminum melt 0.5wt%, 2100r / min under the condition of stirring for 5min, put out the stirring paddle, then keep warm for 5min, cool with the furnace, the prepared small-pore foam aluminum sample refer to Figure 5 , the pore diameter is about 3mm, ...

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Abstract

The invention relates to a coated foaming agent. The coated foaming agent comprises titanium hydride composite particles and an alloy; each titanium hydride composite particle comprises a titanium hydride particle and an oxide layer coating the titanium hydride particle; the titanium hydride composite particles are dispersed in the alloy. A preparation method of the coated foaming agent comprisesthe following steps of providing the titanium hydride composite particles, wherein each titanium hydride composite particle comprises the titanium hydride particle and the oxide layer coating the titanium hydride particle; dispersing the titanium hydride composite particles in the molten alloy; cooling the alloy in which the titanium hydride composite particles are dispersed to obtain a solid composite material; and crushing the solid composite material. A preparation method of foamed aluminum comprises the following steps of providing aluminum melt; adding the foaming agent into the aluminummelt, and making the foaming agent foamed; and performing cooling solidification on the foamed aluminum melt to obtain the foamed aluminum.

Description

technical field [0001] The invention relates to the technical field of foamed aluminum prepared by melt foaming, in particular to a coated foaming agent for preparing small-pore foamed aluminum, a preparation method thereof, and a preparation method of foamed aluminum. Background technique [0002] Aluminum foam is an integrated material of structure and function. It has many excellent properties such as light weight sound absorption, shock absorption and energy absorption, electromagnetic shielding, etc. It has been widely used in military industry, aerospace, automobile, decoration and other fields. The preparation of foamed aluminum has been more than 50 years. It was first obtained by Benjamin Sosnick in the United States by mixing liquid mercury and removing mercury under reduced pressure. With the advancement of research, the gas blowing method, powder metallurgy method, melting Body foaming method and so on. Among them, the melt foaming method has been widely used in...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C21/00
CPCC22C1/08C22C21/00C22C1/086
Inventor 李言祥周旭程颖
Owner TSINGHUA UNIV
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