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Cf/C-SiC composite material as well as preparation method and application thereof

A composite material and prefabricated technology, applied in mechanical equipment, machines/engines, engine components, etc., can solve problems such as poor high-temperature mechanical properties, difficulty in large-scale production, and no marketization, etc., to achieve small contact angle and good wetting Sexuality, the effect of increasing the penetration speed

Active Publication Date: 2017-07-18
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, this kind of piston has not been put into production, and its marketization is still not seen, mainly because there is currently no complete and specific production and preparation process route for carbon fiber pistons, and the simple carbon / carbon composite material itself has poor high-temperature mechanical properties. , poor thermal conductivity, easy soft deformation and other congenital defects, and the preparation cycle is long, so it is difficult to mass-produce, so this puts forward high requirements for the modified preparation and process methods of carbon / carbon composite materials

Method used

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  • Cf/C-SiC composite material as well as preparation method and application thereof
  • Cf/C-SiC composite material as well as preparation method and application thereof
  • Cf/C-SiC composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Such as figure 1 As shown, the preparation method of the silicon carbide fiber reinforced silicon carbide ceramic matrix composite material provided by the embodiment of the present invention comprises the following steps:

[0057] Step 1. Preparation of carbon fiber piston porous prefabricated body:

[0058] The carbon fiber is woven into a piston-shaped preform by a knitting process; the carbon fiber in the carbon fiber piston porous preform is a mesophase pitch-based carbon fiber. The density of the piston shape preform is 0.58g / cm 3 ; The prefabricated body is a three-dimensional and five-directional needle-punched carbon felt porous prefabricated body;

[0059] Step 2. Preparation of carbon / carbon piston preform:

[0060] Using the chemical vapor infiltration method, the carbon fiber piston porous preform is placed in the tooling mold, and then put into the chemical vapor deposition furnace together. On the described carbon fiber piston prefabricated body that ...

Embodiment 2

[0073] Step 1. Preparation of carbon fiber piston porous prefabricated body:

[0074] The carbon fiber is woven into a piston-shaped preform by a knitting process; the carbon fiber in the carbon fiber piston porous preform is a mesophase pitch-based carbon fiber. The density of the piston shape preform is 0.6g / cm 3 ; The prefabricated body is a three-dimensional and five-directional needle-punched carbon felt porous prefabricated body;

[0075] Step 2. Preparation of carbon / carbon piston preform:

[0076] Using the chemical vapor infiltration method, the carbon fiber piston porous preform is placed in the tooling mold, and then put into the chemical vapor deposition furnace together. On the described carbon fiber piston prefabricated body that obtains in step 1 by carbon organic matter precursor, infiltrating carburization, the prepared density is 1.38g / cm 3 carbon / carbon piston preform; when chemical vapor infiltration deposits matrix carbon, the carbon source gas used is ...

Embodiment 3

[0090] Step 1. Preparation of carbon fiber piston porous prefabricated body:

[0091] The carbon fiber is woven into a piston-shaped preform by a knitting process; the carbon fiber in the carbon fiber piston porous preform is a mesophase pitch-based carbon fiber. The density of the piston shape preform is 0.58g / cm 3 ; The prefabricated body is a three-dimensional and five-directional needle-punched carbon felt porous prefabricated body;

[0092] Step 2. Preparation of carbon / carbon piston preform:

[0093] Using the chemical vapor infiltration method, the carbon fiber piston porous preform is placed in the tooling mold, and then put into the chemical vapor deposition furnace together. The carbon-organic precursor is infiltrated on the carbon fiber piston preform obtained in step 1 to prepare a carbon / carbon piston preform; when chemical vapor infiltration deposits matrix carbon, the carbon source gas used is propane, and the diluent gas used is argon Gas and chemical vapor ...

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Abstract

The invention designs a composite material. The composite material comprises carbon-fiber perform, matrix carbon, filler and diamond-like carbon, wherein the matrix carbon is uniformly adhered on the carbon fiber of the perform to form the carbon-fiber perform with the matrix carbon; the filler fills the inside of the carbon-fiber perform with the matrix carbon and coats the outside of the carbon-fiber perform with the matrix carbon to form a semifinished product; the diamond-like carbon comprises a diamond-like carbon layer coated on the semifinished product; and the filler contains a Ti element, a Si element, a C element and a Mo element. The composite material has the advantages that a method of combining four processes of CVI, SI, RMI and PECVD to prepare a finished product with the advantages of high compactness, low thermal expansion coefficient and friction coefficient, high self-lubricating property, high thermal conductivity, oxidation resistance, thermal shock resistance, ablation resistance, wear resistance, high strength and toughness and the like; and simultaneously, the process is simple, the preparation period is short, the equipment requirement is low, the cost is low, net shaping can be realized and convenience is brought for large-scale industrial application.

Description

technical field [0001] The invention belongs to the field of mechanical materials, and more specifically relates to a C f / C-SiC composite material and its preparation method and application. Background technique [0002] The piston is the "heart" of the automobile engine, which bears alternating mechanical loads and thermal loads, and is one of the key components in the engine with the worst working conditions. The function of the piston is to withstand the gas pressure, and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate, and the top of the piston is also an integral part of the combustion chamber. With the rapid development of the automobile industry, high-end sports cars such as Ferrari and Lamborghini have become more and more demanding on the "heart". In order to prolong the service life of the piston and improve its safety in use, various special-shaped structures have to be designed and advanced coating treatment technique...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/622F02F3/10
CPCC04B35/622C04B35/806C04B2235/3821C04B2235/3826C04B2235/3891C04B2235/422C04B2235/427C04B2235/5248C04B2235/614F02F3/10
Inventor 孙少伟欧阳晓平齐福刚
Owner XIANGTAN UNIV
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