Inner heater protection tube made of silicon carbide ceramic composite material and preparation method thereof
A technology of silicon carbide ceramics and composite materials, applied in the field of inorganic non-metallic materials, can solve the problems of short service life, poor corrosion resistance and high cost, and achieve the effects of long service life, reduced production cost, and improved toughness and strength
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[0043] Example 1
[0044] A method for preparing a heater protection tube in a silicon carbide ceramic composite material, the steps are as follows:
[0045] (1) Preparation of preform
[0046] Fix the carbon fiber as figure 1 The specifications and dimensions of the preform shown in the shape of the heater protection tube in the silicon carbide ceramic composite material are as follows: L7=840mm, L5=4mm, D5=150mm, D6=146mm, D4=156mm.
[0047] (2) Pretreatment
[0048] The preform treated in step (1) is calcined at 500° C. for 60 min under a nitrogen atmosphere to obtain a pre-treated preform;
[0049] (3) Coated carbon protective layer
[0050] The preform pretreated in step (2) is immersed in the impregnation solution, the mass fraction of carbon black in the impregnation solution is 45%, the mass fraction of phenolic resin is 5%, the balance is ethanol, and the impregnation is 2.5h. Then dry it at 50°C for 25 minutes to prepare a preform coated with a thin carbon layer;
[0051] (4) Gr...
Example Embodiment
[0069] Example 2
[0070] A method for preparing a heater protection tube in a silicon carbide ceramic composite material, the steps are as follows:
[0071] (1) Preparation of preform
[0072] Fix the graphite fiber as figure 1 The specifications and dimensions of the preform shown in the shape of the heater protection tube in the silicon carbide ceramic composite material are as follows: L7=650mm, L5=4mm, D5=120mm, D6=114mm, D4=127mm.
[0073] (2) Pretreatment
[0074] The preform treated in step (1) is calcined at 500° C. for 60 min under a nitrogen atmosphere to obtain a pre-treated preform;
[0075] (3) Coated carbon protective layer
[0076] The preform pretreated in step (2) is immersed in the impregnation solution, the mass fraction of carbon black in the impregnation solution is 30%, the mass fraction of phenolic resin is 5%, the balance is ethanol, and the impregnation is 2h, then Dry for 30 minutes at 50°C to prepare a preform coated with a thin carbon layer;
[0077] (4) Grout...
Example Embodiment
[0086] Example 3
[0087] A method for preparing a heater protection tube in a silicon carbide ceramic composite material, the steps are as follows:
[0088] (1) Preparation of preform
[0089] Fix the carbon fiber felt as figure 1 The specifications and dimensions of the preform shown in the shape of the heater protection tube in the silicon carbide ceramic composite material are as follows: L7=840mm, L5=4mm, D5=150mm, D6=146mm, D4=156mm.
[0090] (2) Pretreatment
[0091] The preform treated in step (1) is calcined at 500° C. for 90 min under a nitrogen atmosphere to obtain a pre-treated preform;
[0092] (3) Coated carbon protective layer
[0093] The preform after pretreatment in step (2) is immersed in the impregnation liquid, the mass fraction of carbon black in the impregnation liquid is 40%, the mass fraction of phenolic resin is 5%, the balance is ethanol, and the impregnation is 3.5h, Then dry it at 50°C for 35 minutes to prepare a preform coated with a thin carbon layer;
[009...
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