Cf/C-SiC composite material for engine piston and preparation method thereof

A composite material and engine technology, applied in engine components, machines/engines, pistons, etc., can solve the problems of reducing the reliability of the mechanical properties of materials at room temperature, increasing the sensitivity of materials to crack damage, and limiting applications, so as to improve service reliability. , reduce the sensitivity of crack damage, and promote the effect of application

Active Publication Date: 2021-11-26
湖北瑞宇空天高新技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the C prepared by RMI method f The residual Si existing in the matrix of the /C-SiC composite material will expand in volume during the cooling process, and it is easy to generate cracks at the Si-SiC interface, which will reduce the mechanical properties of the material at

Method used

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  • Cf/C-SiC composite material for engine piston and preparation method thereof
  • Cf/C-SiC composite material for engine piston and preparation method thereof
  • Cf/C-SiC composite material for engine piston and preparation method thereof

Examples

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[0035] Example 1:

[0036] (1) Relay needling process for preparing a density of 0.35g / cm 3 The carbon fiber preform;

[0037] (2) method using flash CVI carbon fiber preform for densification of pyrolytic carbon, to obtain a density of 1.35g / cm 3 The C f / C porous body. Wherein the chemical vapor infiltration volume of propane gas and carbon source gas, the dilution gas is nitrogen, propane: Gas: nitrogen volume ratio of 1: 5: 8, the product time 150h infiltration, infiltration product temperature was 980 deg.] C, a pressure of 2000Pa a residence time of 1.8s;

[0038] (3) The resulting C f / C heat treatment the porous body at a high temperature of 2400 deg.] C 2h, argon gas atmosphere, a pressure of 1500Pa, aims to improve the density C f / C graphitization of the porous body, a porous body of non-carbon remove impurities;

[0039] (4) The 6g of anhydrous ethanol and 1g silane coupling agent A-1230 was added to the beaker and mixed, followed by oxalic acid to adjust the pH...

Example Embodiment

[0043] Example 2:

[0044] (1) Relay needling process for preparing a density of 0.40g / cm 3 The carbon fiber preform;

[0045] (2) method using flash CVI carbon fiber preform for densification of pyrolytic carbon, to obtain a density of 1.25g / cm 3 The C f / C porous body. Wherein the chemical vapor infiltration of a carbon source gas volume is propane, the dilution gas is nitrogen source gas with a diluent gas volume ratio of 1:10, 200H infiltration time plot, plot infiltration temperature is 1050 deg.] C, a pressure of 2500Pa; retention time 1.3 s.

[0046] (3) The resulting C f / C heat treatment the porous body at a high temperature of 2200 deg.] C 2h, argon gas atmosphere, a pressure of 1500Pa, aims to improve the density C f Graphitization degree / C of the porous body, remove impurities in the non-porous carbon;

[0047] (4) 1.2g to 8g ethanol and the silane coupling agent A-1230 was added to the beaker and mixed, followed by oxalic acid to adjust the pH value of the sys...

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Abstract

The invention relates to a preparation method of a Cf/C-SiC composite material for an engine piston. The Cf/C-SiC composite material is prepared by densifying a needle-punched carbon fiber preform to the density of 1.95-2.20 g/cm < 3 > through a chemical vapor infiltration (CVI) method, a slurry impregnation (SI) method and a fusion reaction siliconizing (RMI) method. The specific preparation method comprises the following steps: firstly, preparing a carbon fiber preform by adopting a relay type needling method, then preparing a low-density carbon/carbon (Cf/C) porous body by adopting a CVI (Chemical Vapor Infiltration) method, introducing a carbon nanofiller by adopting an SI (Scale Index) method after high-temperature heat treatment, adjusting the pore size and distribution of the Cf/C porous body, and then preparing the Cf/C-SiC composite material by adopting an RMI (Reactive Magnetic Index) method; finally, releasing residual thermal stress through a high-temperature heat treatment method, and preparing the high-reliability and low-damage-sensitivity Cf/C-SiC composite material for the engine piston. The prepared Cf/C-SiC composite material for the engine piston has the advantages of higher room-temperature and high-temperature mechanical strength, smaller thermal expansion coefficient, lower damage sensitivity and excellent self-lubricating property.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic-based composite materials, and in particular relates to a preparation material of a composite material for engine pistons, a preparation method and application thereof. Background technique [0002] The piston is one of the most important parts in the engine, because it works under the conditions of high temperature, high pressure, corrosion, friction, high-speed movement, etc., it has high requirements on the performance of the material. The traditional engine piston materials generally have three types: cast iron, steel and aluminum alloy. The development direction of internal combustion engines with high speed and low energy consumption requires piston materials to have better high-temperature mechanical properties and lighter weight to meet performance requirements. Data show that the maximum explosion pressure of the cylinder internal combustion engine has exceeded 20MPa or ev...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/80C04B35/565C04B35/622F02F3/00
CPCC04B35/83C04B35/80C04B35/565C04B35/622F02F3/0084C04B2235/5454C04B2235/616C04B2235/5288C04B2235/422C04B2235/425C04B2235/96C04B2235/77
Inventor 罗瑞盈罗浩
Owner 湖北瑞宇空天高新技术有限公司
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