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Preform for producing a metal foam

A foam metal and preform technology, which is applied in the field of foam metal production, can solve the problems of oxidation, defective surface state of foam metal, corrosion, etc.

Inactive Publication Date: 2013-12-11
费尔特劳脱公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, and more seriously, the metal foam exhibits a defective surface state due to corrosion and oxidation caused by the use of sodium chloride, which makes it problematic for industrial applications

Method used

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Examples

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Embodiment Construction

[0029] Other characteristics, advantages and details of the invention will be better understood from the description of the following examples, which are given by way of example.

[0030] In the following description, the term "precursor" is understood to mean the spheres formed from the sodium chloride-based mixture. The organic binder may be a carbohydrate such as cereal flour.

[0031] In the following description, more particular attention will be paid to this powder, but this does not constitute a limitation of the invention, as long as the compound used can function as an organic binder.

[0032] Thus, the flour may be a flour commonly obtained from cereals such as wheat, barley, sorghum or rye. Of course other vegetable powders can be used. This powder will of course need to be sieved to obtain a substantially constant particle size. A powder with a particle size of about 200 μm and advantageously less than 150 μm may be used.

[0033] The sodium chloride used has a...

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Abstract

The invention relates to a preform for manufacturing a metal foam having a porosity of 62% to 85%, characterized in that it includes a set of precursors provided in the form of balls consisting of a mixture of 12% to 25% of an organic binder, for example grain flour, 72% to 87% of sodium chloride, and 1% to 3% of kalinite. The invention also relates to the method for using the preform and the metal foam that is obtained after injecting a molten metal or metal alloy.

Description

technical field [0001] The technical scope of the invention is the production of metal foams (mousses metalliques) using preforms made of precursors. Background technique [0002] Metal foam technology is well known and reference is made to patents EP-1808241, US-3236706 and EP-2118328, which propose the production of preforms in pellet form from salts such as sodium chloride. After filling the free spaces between the pellets with the aid of molten metal, the salt is dissolved to recover the metal foam. [0003] Thus, patent EP-2118328 describes a particularly advantageous method proposing the production of preforms from pellets based on cereal flour. The preform is then baked to break up the carbon chains of the pellets before pouring the metal. According to the patent, a paste consisting of flour, sodium chloride and water is first produced. This paste is then formed into pellets, which are then used to make preforms. It was found that, in addition to the preparation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D25/00B22C9/08C03B19/08C22C1/08
CPCC22C1/08B22D25/005Y10T428/12479C22C1/082B22F3/11B22D25/00C03B19/08B22F3/14B22D25/02
Inventor F·波吉
Owner 费尔特劳脱公司
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