Preparation method of double-layer silicon-oxygen-carbon composite ceramic coating for porous ceramic heat insulation matrix
A porous layer, tetramethyltetravinylcyclotetrasiloxane technology, applied in the field of preparation of double-layer silicon oxycarbon composite ceramic coatings, can solve the problems of thin thickness, single coating structure, easy cracking, etc. The effect of good transition, good bonding strength, excellent high emission performance
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Embodiment 1
[0036] 1) Preparation of porous layer polysiloxane PSO precursor slurry: 0.50 g of hydrogen-containing polysiloxane (PHMS), 0.50 g of tetramethyl tetravinylcyclic tetrahydiloxane (D 4 VI) and 1.00 g of dimethylsilicrosiliciloxil (PDMS) were mixed for 30 min to obtain a porous layer polysiloxane (PSO) precursor. 4.00G barium aluminum silicon glass powder (BAS) and 4.00g of silicon (Mosi) 2 As the solid filler, 12.00 g of n-hexane is added to a mixture of polysiloxane (PSO) as a solvent, and the ball milling is added to the ball milling material to obtain a porous layer. Polysiloxane PSO precursor slurry.
[0037] 2) Brushing process of the porous layer: The polysiloxane PSO precursor slurry of the porous layer obtained by step 1) is brushing 3 times on the mullite fiber insulation tile. The porous coating on the fiber insulation wool; the coating is placed at room temperature for 2 h, then in an oven at 60 ° C for 2 h, and pyrolyzes for 2 h under an argon atmosphere in the tube fur...
Embodiment 2
[0043] 1) Preparation of porous layer polysiloxane PSO precursor slurry: 0.50 g of hydrogen-containing polysiloxane (PHMS), 0.50 g of tetramethyl tetravinylcyclic tetrahydiloxane (D 4 VI) and 0.43 g of dimethylsilicrosilicon oil (PDMS) were mixed for 30 min to obtain a porous layer polysiloxane (PSO) precursor. 2.86g barium aluminum silica glass powder (BAS) and 2.86 g of silicon (Mosi 2 As the solid filler, 8.58 g of n-hexane is added to a mixture of silicone (PSO) as a solvent to the solid filler, and the ball milling 2h obtains a ball mill, and 0.02 g of a platinum complex catalyst is added to the ball mill to obtain a porous layer. Polysiloxane PSO precursor slurry.
[0044] 2) Brushing process of the porous layer: The PSO precursor slurry of the porous layer obtained by step 1) is brushed 3 times in the mullite fiber insulation tile, to obtain a mullite fiber insulation tile The porous coating is placed at room temperature at room temperature, then in an oven at 60 ° C for 2 ...
Embodiment 3
[0049] 1) Preparation of porous layer polysiloxane PSO precursor slurry: 0.50 g of hydrogen-containing polysiloxane (PHMS), 0.50 g of tetramethyl tetravinylcyclic tetrahydiloxane (D 4 VI) and 2.33 g of dimethyl silicone (PDMS) were mixed for 30 min to give a porous layer polysiloxane (PSO) precursor. 6.66G barium aluminum silicone glass powder (BAS) and 6.66 g of silicon (Mosi) 2 As the solid filler, 19.95 g of n-hexane is added to a mixture of polysiloxane (PSO) as a solvent to obtain a ball mill, and 0.02 g of a platinum complex catalyst is added to the ball milling material to obtain a porous layer. Polysiloxane PSO precursor slurry.
[0050] 2) Brushing process of the porous layer: The polysiloxane PSO precursor slurry of the porous layer obtained by step 1) is brushing 3 times on the mullite fiber insulation tile. The porous coating on the fiber insulation tile; the coating is placed at room temperature for 2 h, then in an oven at 60 ° C for 2 h, and the argon atmosphere is p...
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