Preparation method of Y2Si2O7 whisker toughened Y2SiO5 composite coating
A composite coating and whisker technology, which is applied in the field of preparation of high-temperature anti-oxidation coatings, can solve the problems of thermal expansion coefficient difference, substrate oxidation, micro-cracks and holes, etc. The effect of microcracks
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[0032] Example 1:
[0033] Step 1: C / C composite material pretreatment:
[0034] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 20×20×20mm 3 Cube, and polished and chamfered the surface, the chamfer is 30°;
[0035] 2) Then use deionized water and absolute ethanol for ultrasonic cleaning 4 times, each cleaning with ultrasonic time of 10min, ultrasonic power of 80W, and finally drying in an electric blast drying oven at 50°C.
[0036] Step 2: Prepare SiC porous inner coating on the surface of C / C composite material by embedding method
[0037] 1) First, take commercially available analytically pure Si powder, C powder and WO with a particle size of 20~30μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3:4.5:0.5 to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;
[0038] 2) Secondly, put the graphite crucible into a vertical vacuum fu...
Example Embodiment
[0050] Example 2:
[0051] Step 1: C / C composite material pretreatment:
[0052] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 23×23×23mm 3 Cube, and polished and chamfered the surface, the chamfer is 35°;
[0053] 2) Then use deionized water and anhydrous ethanol to ultrasonically clean 3 times, each time the ultrasonic time is 20min, the ultrasonic power is 100W, and finally it is dried in an electric blast drying oven at 55℃.
[0054] Step 2: Prepare SiC porous inner coating on the surface of C / C composite material by embedding method
[0055] 1) First, take commercially available analytically pure Si powder, C powder and WO with a particle size of 20~30μm 3 Powder, according to Si powder: C powder: WO 3 Powder=4:4:0.8 to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;
[0056] 2) Secondly, put the graphite crucible into a vertical vacuum...
Example Embodiment
[0067] Example 3:
[0068] Step 1: C / C composite material pretreatment:
[0069] 1) Take the 2D-carbon / carbon composite material used for aircraft brake pads and process it into 25×25×25mm 3 Cube, and polished and chamfered the surface, the chamfer is 40°;
[0070] 2) Then use deionized water and absolute ethanol to ultrasonically clean 5 times, each time the ultrasonic time is 30min, the ultrasonic power is 120W, and finally it is dried in an electric blast drying oven at 60℃.
[0071] Step 2: Prepare SiC porous inner coating on the surface of C / C composite material by embedding method
[0072] 1) First, take commercially available analytically pure Si powder, C powder and WO with a particle size of 20~30μm 3 Powder, according to Si powder: C powder: WO 3 Powder=3.5:5:1.0 mass ratio to prepare embedding powder, then put the pretreated carbon / carbon composite material into a graphite crucible and embed it in the embedding powder;
[0073] 2) Secondly, put the graphite crucible in a verti...
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