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Porous body and method for the production thereof

A technology of porous bodies and porous substrates, applied in gaseous chemical plating, metal material coating process, coating, etc., can solve the problems that cannot be used to filter molten metal, limited use, etc.

Active Publication Date: 2019-10-25
SCHUNK KOHLENSTEOFFTECHNIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of known porous bodies is that their use in high temperature applications is limited
Therefore, due to the wetting properties of its surface, the filter body can hardly be used for filtering molten metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] Substrates made of carbon or ceramic materials can be produced by sintering, for example, it is necessary for the substrate to have an open-pore structure, ie a fluid can flow through the substrate. Since the material of the substrate is relatively stable in temperature, the substrate can be infiltrated with a chemical vapor phase in such a way that silicon nitride is deposited in the pores of the substrate and forms a surface layer on the surface of the substrate. This surface layer made of silicon nitride can also mechanically stabilize the substrate. With the help of silicon nitride, it is also possible to significantly improve the wetting properties of the surface of the porous body. Improved wetting behavior is to be understood as the least possible surface wettability, corresponding to a hydrophobic surface. The porous body is then suitable as filter body for example for aluminum melts. However, due to the high solidity and temperature resistance of silicon nitr...

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PUM

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Abstract

The invention relates to a porous body, in particular a filter body or insulating body, a method for producing a porous body and to a use of crystalline silicon nitride, wherein a porous base body made of carbon or a ceramic material is infiltrated with a chemical vapor infiltration (CVI), the base body is infiltrated with silicon nitride (Si3N4), in which at least one surface layer is formed fromsilicon nitride inside pores of the base body when infiltrating the base body.

Description

technical field [0001] The present invention relates to porous bodies and methods of preparing porous bodies, in particular filters or insulation bodies, using chemical vapor infiltration to infiltrate porous substrates made of carbon or ceramic materials. Background technique [0002] The use of porous solids as rigid filter media or as insulation is well known. Rigid filter media may, for example, be formed by sintering of fibers or particles of a material such as a metal or ceramic material. The fibers or particles are connected in such a way that they form an open cell body through which gas or liquid can flow. It is also known to produce such filter elements from silicon nitride as the base material. Furthermore, it is also known to produce open-cell metal foams. In addition to their use as filters, such porous bodies as a function of porosity can also be used as insulators, for example for high temperature applications. In order to influence the material properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/04C23C16/34
CPCC23C16/045C23C16/345
Inventor 卡尔·布伦弗里克约翰内斯·格蕾
Owner SCHUNK KOHLENSTEOFFTECHNIK GMBH