Carbon nanotube modified composite material piston for engine as well as preparation method and application of carbon nanotube modified composite material piston

A technology of carbon nanotube modification and composite materials, which is applied in the direction of engine components, machines/engines, pistons, etc., can solve problems such as unsatisfactory engines, achieve improved interface bonding, improve fuel efficiency and engine power, and good self-lubrication sexual effect

Active Publication Date: 2021-12-24
湖北瑞宇空天高新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous development of engines in the direction of high power, light fuel consumption, low noise, long life, low emissions and environmental friendliness, traditional cast iron, cast steel, aluminum alloy and other materials have reached or approached the limit of use, and more and more Can not meet the requirements of the rapid development of the engine

Method used

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  • Carbon nanotube modified composite material piston for engine as well as preparation method and application of carbon nanotube modified composite material piston
  • Carbon nanotube modified composite material piston for engine as well as preparation method and application of carbon nanotube modified composite material piston
  • Carbon nanotube modified composite material piston for engine as well as preparation method and application of carbon nanotube modified composite material piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) In the axial direction, 12K T700 carbon fiber non-weft cloth is combined with a layer of carbon fiber mesh needle punching to form a unit layer, and in the circumferential direction, 12K T700 carbon fiber is continuously wound and compounded with a layer of carbon fiber mesh needle punching to form another unit layer. Layers and unit layers are alternately superimposed and continuously needled to produce a density of 0.40g / cm 3 Carbon fiber prefabricated body (ie piston prefabricated body);

[0035] (2) Heat-treat the carbon fiber preform at 2100°C for 1 hour under a helium protective atmosphere;

[0036] (3) Using a mixture of natural gas and propane as the carbon source gas to prepare a carbon dioxide gas with a density of 1.35g / cm 3The C / C porous body, in which the volume ratio of natural gas:propane:nitrogen is 4:1:6, the infiltration time is 300h, the residence time is 1.8s, the infiltration temperature is 1030℃, and the pressure is 2000Pa;

[0037] (4) heat-...

Embodiment 2

[0044] (1) Needle punching with 12K T800 carbon fiber non-weft cloth combined with a layer of carbon fiber mesh tire in the axial direction, continuous winding with 12K T1000 carbon fiber combined with a layer of carbon fiber mesh tire needle punching in the circumferential direction, unit layer and unit layer alternate superimposed continuous needle punching , to prepare a density of 0.55g / cm 3 Carbon fiber preform;

[0045] (2) Heat-treat the carbon fiber preform at 2000°C for 0.5h under an argon protective atmosphere;

[0046] (3) Using a mixture of propane and nitrogen as the gas source to prepare a density of 1.35g / cm 3 The C / C porous body, in which the volume ratio of propane to nitrogen is 1:8, the infiltration time is 500h, the residence time is 2.0s, the infiltration temperature is 1050℃, and the pressure is 2500Pa;

[0047] (4) heat-treat the C / C porous body at a temperature of 2250°C, a pressure of 1500Pa, and a helium atmosphere for 2 hours;

[0048] (5) Machini...

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Abstract

The invention relates to a carbon nanotube modified composite material piston for an engine and a preparation method and application of the carbon nanotube modified composite material piston, and belongs to the technical field of piston materials and piston design and processing. The specific preparation method comprises the steps: designing and preparing a prefabricated body structure; performing high-temperature heat treatment; preparing a low-density C / C porous body by adopting a CVI method; performing high-temperature heat treatment on the C / C porous body; performing primary machining to form a piston blank, and growing carbon nanotubes in situ in pores of the C / C porous body by adopting a normal-pressure CVD method; densifying the piston blank through an RMI method, and performing secondary machining according to the requirement for the size of a finished piston; and after finish machining is completed, coating a piston combustion chamber and a piston top position with anti-oxidation coating layers, and thus obtaining the finished product of the nanotube modified composite material piston. The composite material piston provided by the invention has positive significance in improving the output power of an engine, reducing oil consumption, reducing noise, prolonging the service life of the piston, reducing emission and improving the environment.

Description

technical field [0001] The invention relates to the field of engine parts, in particular to a piston and its preparation method and application. Background technique [0002] The piston is called the "heart" of the engine and is one of the most important parts in the engine. Its function is to bear the gas pressure and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate. During the working process of the engine, it not only has to bear the heat load generated by the top gas, but also bears mechanical loads such as explosion pressure, reciprocating inertia force, lateral force and friction force, so the performance requirements of the material are very high. To a large extent, the piston The service life of the engine determines the reliability of the engine work and the durability of use. However, with the continuous development of engines in the direction of high power, light fuel consumption, low noise, long life, low emissions and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573C04B35/577C04B35/83C04B35/622F02F3/00F02F3/02
CPCC04B35/573C04B35/83C04B35/622F02F3/0084F02F3/02C04B2235/614C04B2235/616C04B2235/5248C04B2235/5288C04B2235/428C04B2235/658
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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