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Protection against the oxidation of composite material parts containing carbon and parts thus protected

A composite material, anti-oxidation technology, applied in mechanical equipment, friction linings, gear transmission mechanisms, etc., can solve problems such as complex anti-oxidation protection methods

Inactive Publication Date: 2006-09-06
SNECMA PROPULSION SOLIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of achieving complete oxidation protection is complicated because the protection is composed of two superimposed layers, each requiring their own method of implementation

Method used

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  • Protection against the oxidation of composite material parts containing carbon and parts thus protected
  • Protection against the oxidation of composite material parts containing carbon and parts thus protected
  • Protection against the oxidation of composite material parts containing carbon and parts thus protected

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Samples of C / C composites were prepared as follows.

[0058] The stack is formed by stacking unidirectional fiber sheets of carbon precursor fibers (pre-oxidized polyacrylonitrile) in different directions and bonded together by needling. The resulting fiber preforms were subjected to heat treatment to convert the precursors to carbon by pyrolysis, and then reinforced with the pyrolyzed carbon matrix by chemical vapor infiltration. Such methods are known. Reference may be made, for example, to document US 4 790 052 . The blocks of C / C material obtained by this method were cut into samples in the form of cuboid blocks having dimensions of 20 mm x 25 mm x 8 mm.

[0059] Some samples were provided with oxidation protection by a method comprising the following steps:

[0060] a) Pretreatment of the sample by immersing the sample in an ultrasonic vessel containing an aqueous solution of a wetting agent based on polyethoxy isononyl available under the trade name "Marlophen ...

Embodiment 2

[0086] As in the procedure in Example 1, but in step c), using a compound containing 32% by weight of Al(H 2 PO 4 ) 3 , 56% ZrB 2 , and the impregnating composition remaining as water.

[0087] Some samples protected using the method of example 2 were subjected to the same oxidation test as test V) above.

[0088] Table II shows the relative weight loss (percentage relative to the initial weight) measured on each sample after carrying out the test. For comparison, Table II also shows the weight loss observed in the same oxidation tests carried out on samples protected according to Example 1 and samples protected according to the reference.

[0089] Table II

[0090] sample

[0091] The results show that the use of ZrB in impregnation compositions 2 instead of TiB 2 This results in a significant reduction in effectiveness in oxidation protection similar to that observed in samples protected according to the prior art.

Embodiment 3

[0093] Using samples made of the same type of C / C composite as in Example 1, they were protected against oxidation by adapting the method described in Example 1 as follows:

[0094] · In step b), use contains by weight: 44% Al(H 2 PO 4 ) 3 , 14% of TiB in powder form with an average particle size of about 10 μm 2 , and the impregnating composition remaining as water; and

[0095] · In step c), use contains by weight: 34% Al(H 2 PO 4 ) 3 and 39% of TiB in powder form with an average particle size of about 10 μm 2 impregnation composition.

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Abstract

A part made of a composite material containing carbon, having an open internal residual porosity is protected against oxidation by performing at least one stage in which an impregnating composition is applied, said impregnating composition containing at least one metal phosphate and titanium diboride. Efficient protection against oxidation is thus obtained at temperatures of more than 1000 DEG C, also in the presence of a carbon oxidation catalyst and in a damp medium.

Description

technical field [0001] The present invention relates to providing protection against oxidation of components made of carbon-containing composite materials, in particular thermal structural composite materials comprising carbon fiber reinforcement reinforced by a matrix at least partially composed of carbon. Background technique [0002] Thermostructural composites are characterized by their good mechanical properties, and the ability to preserve these properties at high temperatures. However, in oxidizing media, this ability to preserve good mechanical properties at elevated temperatures depends on the presence of effective oxidation protection. Regardless of the manner in which these materials are prepared, they inevitably have residual internal open pores that allow oxygen from the surrounding medium to enter the center of these materials. [0003] Additionally, in certain applications, especially in carbon / carbon (C / C) composite brake discs for avia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/52F16D69/02C04B41/50C04B41/85C04B41/89
CPCC04B2111/00362F16D69/023C04B41/5092C04B41/009F16D2200/0047C04B41/52C04B41/89C04B41/85C04B41/5031C04B41/5035C04B41/5037C04B41/507C04B35/83F16D69/02
Inventor 帕斯卡尔·迪斯雅克·泰博
Owner SNECMA PROPULSION SOLIDE
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