Carbon-base brake material for track vehicle
A technology for braking materials and rail vehicles, which is applied to carbon-based braking materials, and the manufacturing field of manufacturing the carbon-based braking materials, can solve the problems of high braking cost of friction materials, and achieve light weight, stable friction number, and easy use. low noise effect
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[0045] (1). Preparation of phenolic foam
[0046] First, the predetermined foaming agent, curing agent and carbon fiber (graphite powder) are evenly mixed according to the weight percentage requirement. Add surfactant to phenolic resin and preheat (50°C), then add foaming agent, curing agent and carbon fiber (graphite) mixture, stir the mixture for 4 minutes with mechanical stirring and ultrasonic vibration, and then pour Mold, foamed at 80°C to obtain phenolic foam. Different densities (0.1-0.6 g. / cm 3 ) and pore size (0.1 ~ 1mm) of phenolic foam.
[0047] (2). Carbonization heat treatment of phenolic foam
[0048] Put the phenolic foam in the vacuum carbonization furnace, under the vacuum state of 0.1Pa, raise the temperature to 1000-1200℃ at a heating rate of 40℃ / h, and keep it warm for 2 hours to obtain a foamed carbon preform with a density of 0.1-0.5g / h cm 3 .
[0049] (3). Densification of foam carbon preform
[0050] ·Chemical Vapor Deposition (CVD)
[0051] Put ...
Embodiment 1
[0061] In percent by weight, the ratio of m (phenolic resin): m (curing agent): m (surfactant): m (foaming agent) = 100: 20: 3: 5 was fully stirred evenly by means of mechanical stirring. Wherein, the phenolic resin is a thermosetting phenolic resin (solid content: 80%; viscosity (20°C): 2.5Pa·s); wherein, the curing agent is p-toluenesulfonic acid; wherein, the surfactant is Tween-80; wherein, The blowing agent is sodium bicarbonate. At 65°C, the foam is phenolic foam. Heat the phenolic foam to 1200°C at a rate of 40°C / h in a vacuum carbonization furnace at a vacuum of 0.1 Pa, and keep it warm for 2 hours to obtain a foamed carbon preform with a density of 0.32g / cm 3 . The microstructure of carbon foam is figure 2 shown.
[0062] The densification process adopted is a combination of isothermal chemical vapor deposition and pitch impregnation / carbonization.
[0063] Firstly, the carbon foam preform is densified by chemical vapor deposition (CVD): natural gas is used as t...
Embodiment 2
[0068] By weight percentage, the ratio of m (phenolic resin): m (curing agent): m (surfactant): m (foaming agent): m (carbon fiber) = 100: 15: 7: 7: 5, mechanically Stir well to mix well. Wherein, the phenolic resin is a thermosetting phenolic resin (solid content: 80%; viscosity (20°C): 2.5Pa·s); wherein, the foaming agent is sodium bicarbonate; wherein, the curing agent is p-toluenesulfonic acid; wherein, the surface The active agent is Tween-80; wherein, the carbon fiber is polypropylene cyano (PAN) fiber, and the fiber length is 2mm. At 60°C, the foam is phenolic foam. Heat the phenolic foam to 1200°C at a rate of 40°C / h under a vacuum state of 0.1 Pa in a vacuum carbonization furnace, and keep it warm for 2 hours to obtain a foamed carbon preform with a density of 0.34g / cm 3 . Microstructure as attached Figure 5 .
[0069] The densification process adopted is a combination of isothermal chemical vapor deposition and pitch impregnation / carbonization.
[0070] The ca...
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