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Graphite-containing moulded body and method for the production thereof

A molding body, graphite technology, applied in the directions of graphite, chemical instruments and methods, flange connections, etc., can solve the problems of uneven impregnation, no impregnation, uneven distribution of impregnating agents, etc., and achieve effective preparation and simple cost. Effect

Inactive Publication Date: 2012-11-14
SGL CARBON SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a disadvantage of such materials prepared by liquid-phase impregnation is that the impregnating agent is distributed inhomogeneously, especially in the depth direction or z-direction of the material
Although a high degree of impregnation and relatively uniform impregnation is thus achieved in the surface regions of the material, the inner regions of the material thus impregnated between the surface regions show no impregnation, or only a relatively low or uneven degree of impregnation
Consequently, because of said surface impregnation, a seal made of this material necessarily exhibits a relatively high impermeability to liquids and gases in its surface regions; however, in the central region located between the surface regions, it is relatively permeable, which is why these seals are only suitable to some extent as flat seals

Method used

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  • Graphite-containing moulded body and method for the production thereof
  • Graphite-containing moulded body and method for the production thereof
  • Graphite-containing moulded body and method for the production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Expanded graphite with a bulk density of 3.5 g / l was mixed with silicone resin powder, Silres MK from Wacker Chemie AG, Burghausen, Germany, to form % silicone powder, and then mix in a container for 1 minute.

[0082] The mixture thus obtained is then transferred into a steel pipe with a diameter of 90 mm, pressed by a pressure piston by its own weight and as a density of about 0.07 g / cm 3 The preform is removed. The preform was then compressed with pressure to a desired film thickness of 1 mm, and the doped film thus obtained was subjected to conditions of 180° C. for 60 minutes in order to melt the plastic.

[0083] Two of these membranes were pressed with perforated plates having a thickness of 0.1 mm, and the leakage rate of the molded bodies was determined according to DIN EN 13555 using helium as test gas (40 bar internal pressure).

[0084] The specific surface pressures required to achieve specific leakage levels are given in Table 1 below.

Embodiment 2 and 3

[0093] Expanded graphite with a bulk density of 3.5 g / l was mixed with an inorganic filler, i.e. in Example 2 ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and in Example 3 boron carbide (B4C) to form a mixture comprising 90 wt% expanded graphite and 10 wt% inorganic filler, and then mixed in a container for 1 minute.

[0094] The mixture thus obtained is then transferred into a steel pipe with a diameter of 90 mm, pressed by a pressure piston by its own weight and as a density of about 0.07 g / cm 3 The preform is removed. The preform was then compressed with pressure to a desired film thickness of 1 mm, and the doped film thus obtained was subjected to 180° C. for 60 minutes.

[0095] Nitrogen as test gas according to DIN 28090-1 and relative to 2,000g / m 2 The weight per unit area of ​​the molded body, and the leakage rate of both samples were measured at a surface pressure of 32 MPa.

[0096] The obtained values ​​are summarized in Table 2 below.

Embodiment 4 to 7

[0105] Expanded graphite with a bulk density of 3.5 g / l was mixed with, as inorganic filler, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), for Examples 6 and 7, diammonium phosphate (NH 4 ) 2 HPO 4 , to form a mixture comprising 95 wt% expanded graphite and 5 wt% inorganic filler, and then mixed in a container for 1 minute.

[0106] The mixture thus obtained is then transferred into a steel pipe with a diameter of 90 mm, pressed by a pressure piston by its own weight and as a density of about 0.07 g / cm 3 The preform is removed. The preforms were then compressed with pressure to a desired film thickness of 1 mm and the doped films thus obtained were subjected to the various conditions outlined in Table 3 below.

[0107] Nitrogen as test gas according to DIN 28090-1 and relative to 2,000g / m 2 The weight per unit area of ​​the molded body, and the leakage rate of all samples were determined at a surface pressure of 32 MPa.

[0108] The obtained values ​​are summarized i...

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Abstract

The invention relates to a graphite-containing moulded body (5) which can be obtained by a method in which graphite particles (6) are mixed with at least one solid additive (7) to form a mixture which comprises at least one inorganic additive, a mixture consisting of an inorganic additive and an organic additive or more than 10 wt.% of an organic additive and the thus obtained mixture is subsequently compressed. Said at least one additive (1) which is used comprises particles having an average diameter (d50) of between 1 and 500 [mu]m, determined in accordance with the ISO 13320 standard.

Description

technical field [0001] The invention relates to a graphite-containing molded body which is particularly suitable for use as a seal, as a covering for structural materials such as walls or ceilings, for example as bipolar plates for redox flow batteries, as heat exchangers Plates or heat exchanger tubes, and methods for their manufacture. Background technique [0002] Seals, such as flat seals, for eg chemical installations have to meet various requirements. In particular it must have a low permeability to liquids and gases, and in particular in the sealing plane, in particular as in the case of a flat seal. Among other things, it must be characterized by high tensile strength, high transverse strength, good thermal conductivity, good adaptability and good dry sliding friction properties. For many applications, high temperature resistance and good resistance to aggressive chemical agents are also necessary. [0003] Due to graphite's high temperature resistance especially ...

Claims

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Application Information

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IPC IPC(8): C04B35/536C04B35/52F16J15/00H01L23/00E04C2/00C09C1/46C01B31/04H01M2/00H01M4/00H05B3/00C08K3/04B32B18/00H01M8/00F16L23/00C04B37/00C01B32/21H01M8/0202H01M8/18
CPCY02E60/12Y02E60/50Y02E60/10Y02P70/50
Inventor 奥斯温·奥廷格赖纳·施米特于尔根·巴赫尔西尔维亚·梅西恩巴斯蒂安·胡德雷尔
Owner SGL CARBON SE
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