Preparation method of SiC coating
A coating and pre-coating technology, applied in the field of SiC coating preparation, can solve the problems of insufficient bonding strength and easy peeling off of the coating, and achieve the effects of good oxidation resistance, high bonding strength and short production cycle
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Embodiment 1
[0047] In this embodiment, the SiC high temperature resistant coating is prepared by the brushing method, which includes the following steps:
[0048] 1. Pre-coating of high-density body
[0049] 1.1 Put the high-density body including graphite parts and carbon parts into a closed container, vacuumize the container to a vacuum degree of 9Pa, and then continue to pump for 1 hour. Then vacuum inhale polymethylsilane until the polymethylsilane submerges the green body, and then impregnate under vacuum for 30 minutes.
[0050] 1.2 After the impregnation is completed, the green body is transferred to an infrared oven for curing. The curing conditions were set as follows: heating up to 250°C at 1°C / min, and keeping the temperature for 3 hours.
[0051] 1.3 Soak the cured green body in absolute ethanol, put it into the ultrasonic pool, and ultrasonically treat it for 30 minutes under the condition of ultrasonic frequency 46HZ;
[0052] 1.4 Wash the green body 3 times with clean wa...
Embodiment 2
[0066] In this embodiment, the SiC high temperature resistant coating is prepared by the brushing method, which includes the following steps:
[0067] 1. Pre-coating of high-density body
[0068] 1.1 Put the high-density green body, including graphite parts and carbon parts, into a closed container, vacuumize the container to a vacuum degree of 15Pa, and continue to vacuum for 1 hour. The polymethylsilane was sucked in by vacuum until the polymethylsilane submerged the body. Immerse under vacuum for 1h.
[0069] 1.2 After the impregnation is completed, the green body is transferred to an infrared oven for curing. The curing conditions were set as follows: heating up to 270°C at 1°C / min, and keeping the temperature for 2 hours.
[0070] 1.3 Soak the cured green body in absolute ethanol, put it into the ultrasonic pool, and ultrasonically treat it for 30 minutes under the condition of ultrasonic frequency 46HZ;
[0071] 1.4 Wash the green body 3 times with clean water;
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Embodiment 3
[0086] In this embodiment, the SiC high temperature resistant coating is prepared by the brushing method, which includes the following steps:
[0087] 1. Pre-coating of high-density body
[0088] 1.1 Put the high-density green body including graphite parts and carbon parts into a closed container, vacuumize the container to a vacuum degree of 20Pa, and continue to vacuum for 1 hour. The polymethylsilane was sucked in by vacuum until the polymethylsilane submerged the body. Immerse under vacuum for 2h.
[0089] 1.2 After the impregnation is completed, the green body is transferred to an infrared oven for curing. The curing conditions were set as follows: heating up to 220°C at 1°C / min and keeping the temperature for 4 hours.
[0090] 1.3 Soak the cured green body in absolute ethanol, put it into the ultrasonic pool, and ultrasonically treat it for 30 minutes under the condition of ultrasonic frequency 46HZ;
[0091] 1.4 Wash the green body 3 times with clean water;
[0092...
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