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Fast connection method of carbon/carbon composite material

A carbon composite material and quick connection technology, which is applied in the connection field of ceramic matrix composite materials, can solve the problems of use temperature and strength limitation, and achieve the effect of short connection time, simple process and tight interface bonding.

Inactive Publication Date: 2013-08-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The binder bonding of carbon / carbon composites is also a simple method for connecting carbon / carbon composites. However, since most of the binders cannot be used in high temperature environments, the carbon / carbon prepared by the binder method cannot be used. The temperature and strength of carbon composite materials are still very limited

Method used

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Experimental program
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preparation example Construction

[0025] (1) Preparation of X-Si paste: commercially available or self-made (synthesized by high-energy ball milling) X-Si alloy (X is X=Ni, Co, Ti or Cr, Si content is 40-80%, Atomic percentage, the same below) powder is further ground, then add ethylene oxalate and collodion solution (according to X-Si powder: ethylene oxalate: collodion solution = 5g: 3 ~ 5ml: 6 ~ 10ml), and stir for 30min above to make X-Si ointment;

[0026] (2) Pretreatment of carbon / carbon composite materials: the connecting surfaces of the composite materials are sequentially ground, cleaned and dried;

[0027] (3) Pretreatment of the interlayer metal sheet: cutting and processing the interlayer metal (Mo or Ti) with a thickness of 50-200 μm into a metal sheet of the same size as the composite material connection surface, cleaning and drying;

[0028] (4) Coating of X-Si alloy paste on the connecting surface of the composite material: apply the X-Si paste adjusted according to step (1) on the connecting...

Embodiment 1

[0031] 1. Preparation of Ni-40Si ointment:

[0032] First grind the commercially available Ni-40Si alloy powder, add ethylene oxalate, ultrasonicate for 20 minutes, then add collodion solution (collodion) into the bottle, stir with a glass rod for more than 30 minutes, and set aside. Among them, Ni-Si powder: ethylene oxalate: collodion solution = 5g: 4ml: 8ml.

[0033] 2. Pretreatment of carbon / carbon composite materials: first make the density about 1.70g / cm 3 Commercially available carbon / carbon composites were processed into (where the connecting surface is perpendicular to the carbon fiber), the connecting surface is ground on a diamond grinding disc, ultrasonically cleaned with absolute ethanol, and dried in an oven.

[0034] 3. Pretreatment of the metal sheet in the middle layer: the pure Ti sheet with a thickness of 200 μm is processed by wire cutting into The thin discs were boiled and washed in weak lye for 15 minutes, lightly polished on both sides, ultrasonica...

Embodiment 2

[0038] 1. Preparation of Co-Si paste:

[0039] First mix commercially available Co and Si powders according to the atomic percentage Co:Si=27.5:72.5 and place them in a high-energy ball mill to obtain Co-72.5Si alloy powders, then add ethylene oxalate after grinding, and ultrasonically treat for 20 minutes , and then add collodion solution (collodion) into the bottle, stir with a glass rod for more than 30 minutes, and set aside. Among them, Co-Si powder: ethylene oxalate: collodion solution = 5g: 3ml: 6ml.

[0040] 2. Pretreatment of carbon / carbon composite materials: first make the density about 1.70g / cm 3 Commercially available carbon / carbon composites were processed into (where the connecting surface is perpendicular to the carbon fiber), the connecting surface is polished on a diamond grinding disc, ultrasonically cleaned with absolute ethanol and dried in an oven.

[0041] 3. Pretreatment of the metal sheet in the middle layer: the pure Mo sheet with a thickness of 5...

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Abstract

The invention discloses a fast connection method of a carbon / carbon composite material. The method includes the steps of: (1) preparation of an X-Si (X=Ni, Co, Ti or Cr) alloy paste; (2) pretreatment of the carbon / carbon composite material; (3) pretreatment of a middle layer metal sheet (including Mo or Ti sheet); (4) coating of a composite material connection surface with the X-Si alloy paste; and (5) assembling and quick connection: arranging two X-Si alloy coatings and one middle layer metal sheet in the middle of the connection surface of two carbon / carbon composite components so as to form an X-Si / middle layer metal sheet / X-Si sandwich structure, with the Si atomic percentage content of the X-Si alloy being 40-80%, under the conditions of 10-40MPa pressure assembling, vacuum protection and a heating rate of 100-300DEG C / min, conducting heating to 1200-1600DEG C, and performing heat preservation for 1-10min. The method disclosed in the invention can realize liquid phase connection of carbon / carbon composite materials. The process is simple, and the prepared connecting piece has a reliable structure and can be used in load bearing and high temperature application occasions.

Description

technical field [0001] The invention relates to a connection method of ceramic matrix composite materials, in particular to a quick connection method of carbon / carbon composite materials. Background technique [0002] Regarding the application of carbon / carbon composite materials, it is mainly based on the consideration of low cost of manufacture, resistance to high temperature oxidation and structural diversification. At present, the connection methods of carbon / carbon composite materials mainly include mechanical fixing, bonding, brazing and diffusion welding. Regarding the mechanical fixation of carbon / carbon composite materials, refractory metal or carbon screws are mainly used for fastening. The binder bonding of carbon / carbon composites is also a simple method for connecting carbon / carbon composites. However, since most of the binders cannot be used in high temperature environments, the carbon / carbon prepared by the binder method cannot be used. The use temperature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
Inventor 刘桂武周重见乔冠军罗莉夏鸿雁史忠旗王继平
Owner XI AN JIAOTONG UNIV
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