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
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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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