Thermal structure composite material high-temperature anti-oxidation composite coating and preparation method thereof
A high-temperature anti-oxidation and composite material technology, applied in the field of materials, can solve problems such as coating surface cracks and coating failures, and achieve the effects of less thermal damage, less volatilization and low preparation cost
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[0022] The method for preparing a high-temperature oxidation-resistant composite coating of a thermal structure composite material according to an embodiment of the present invention mainly includes the following steps.
[0023] Pre-oxidation: The thermal structure composite material is kept at a first preset temperature for the first preset time, and after pre-oxidation, the thermal structure composite material is naturally cooled to room temperature. Specifically, the cleaned thermal structure composite material is placed in a quartz tube or crucible with through holes at both ends, and placed in a muffle furnace. As for the constant temperature zone in the middle of the furnace cavity, the tube body is heated to about 900 ℃~1000℃, heat preservation is about 3min~6min, after reaching the pre-oxidation time, take out the quartz tube from the muffle furnace cavity, and let it cool naturally in room temperature environment. After the thermal structure composite material is pre-oxi...
Embodiment 1
[0028] Take the density as 1.75g / cm 3 The thermal structure composite material is processed into a sample of 10mm×10mm×10mm, polished with SiC sandpaper, and ultrasonically cleaned in absolute ethanol for 15 minutes; the cleaned thermal structure composite sample is dried at a temperature of 120°C for 15 hours stand-by.
[0029] Put the cleaned thermal structure composite material sample into the quartz tube with through holes at both ends, and use the program temperature control device to heat up the muffle furnace. The pre-oxidation temperature is set to 900℃. When the muffle furnace temperature rises to 900℃ When it is constant, put the quartz tube containing the thermal structure composite material into the muffle furnace, and the part of the tube body with the sample is placed in the middle of the furnace cavity, that is, the constant temperature zone, and the pre-oxidation temperature of the sample is 900 ℃. The pre-oxidation time is 3min. After the pre-oxidation time is r...
Embodiment 2
[0034] Take the density as 1.75g / cm 3 The thermal structure composite material is processed into a sample of 10mm×10mm×10mm, polished with SiC sandpaper, and ultrasonically cleaned in absolute ethanol for 25min; the cleaned thermal structure composite sample is dried at a temperature of 120℃ for 20h stand-by.
[0035] Put the cleaned thermal structure composite material sample into the quartz tube with through holes at both ends, and use the program temperature control device to heat up the muffle furnace. The pre-oxidation temperature is set to 950℃. When the muffle furnace temperature rises to 950℃ When it is constant, put the quartz tube containing the thermal structure composite material into the muffle furnace, and the part of the tube body with the sample is placed in the middle of the furnace cavity, that is, the constant temperature zone, and the pre-oxidation temperature of the sample is 950℃. The pre-oxidation time is 6min. After the pre-oxidation time is reached, the ...
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