Carbon/carbon composite material surface mullite whisker-mullite/yttrium alumina silicate compound anti-oxidation coating and preparation method
A mullite whisker and carbon composite material technology, which is applied in the field of anti-oxidation coating preparation, can solve the problems of high porosity and low interface bonding strength, etc.
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Embodiment 1
[0034] (1) Press Al 2 (SO 4 ) 3 18H 2 O: Na 2 SO 4 9H 2 O=1:1, take Al 2 (SO 4 ) 3 18H 2 O and Na 2 SO 4 9H 2 0, dry ball milling and mixing for 1h to prepare mixed salt A;
[0035] (2) Clean the SiC-C / C matrix sample ultrasonically, after drying, according to the mass ratio of SiC-C / C matrix sample: mixed salt A=1:10, the SiC-C / C composite material sample The samples were embedded in mixed salt A, and heat-treated in a muffle furnace at a temperature of 950°C for 20 minutes;
[0036] (3) Wash the sample treated in step (2) with boiling water, then dry the sample in an electric blast drying oven at 80°C for 4 hours to obtain a sample with a mullite whisker layer;
[0037] (4) With a concentration of 1wt% polyvinyl alcohol solution as a binder, mix in a ball mill according to the mass ratio of commercially available mullite powder: distilled water: absolute ethanol: polyvinyl alcohol = 4:4:1:1 Uniform, and then use spray granulation method to granulate. During sp...
Embodiment 2
[0045] (1) Press Al 2 (SO 4 ) 3 18H 2 O: Na 2 SO 4 9H 2 O=9:10, take Al 2 (SO 4 ) 3 18H 2 O and Na 2 SO 4 9H 2 O, dry ball milling and mixing for 2h to prepare mixed salt A;
[0046] (2) Clean the SiC-C / C matrix sample ultrasonically, after drying, according to the mass ratio of SiC-C / C matrix sample: mixed salt A=1:15, the SiC-C / C composite material sample The sample was embedded in mixed salt A, and heat-treated in a muffle furnace at a temperature of 900°C for 30 minutes;
[0047] (3) Wash the sample treated in step (2) with boiling water, then dry the sample in an electric blast drying oven at 100°C for 3 hours to obtain a sample with a mullite whisker layer;
[0048] (4) With a concentration of 3wt% polyvinyl alcohol solution as a binder, mix in a ball mill according to the mass ratio of commercially available mullite powder: distilled water: absolute ethanol: polyvinyl alcohol = 4:4:1:1 Uniform, and then use spray granulation method to granulate. During sp...
Embodiment 3
[0056] (1) Press Al 2 (SO 4 ) 3 18H 2 O: Na 2 SO 4 9H 2 O=4:5, take Al 2 (SO 4 ) 3 18H 2 O and Na 2 SO 4 9H 2 O, dry ball milling and mixing for 3h to prepare mixed salt A;
[0057] (2) Clean the SiC-C / C matrix sample ultrasonically, and after drying, according to the mass ratio of SiC-C / C matrix sample: mixed salt A=1:20, the SiC-C / C composite material sample The sample was embedded in mixed salt A, and heat-treated in a muffle furnace at a temperature of 1000°C for 15 minutes;
[0058] (3) Wash the sample treated in step (2) with boiling water, then dry the sample in an electric blast drying oven at 120°C for 2 hours to obtain a sample with a mullite whisker layer;
[0059](4) With a concentration of 2wt% polyvinyl alcohol solution as a binder, mix in a ball mill according to the mass ratio of commercially available mullite powder: distilled water: absolute ethanol: polyvinyl alcohol = 4:4:1:1 Uniform, and then granulated by spray granulation method. During sp...
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