Antioxidative high emissivity coating on the surface of porous fibrous carbon-based thermal insulation material and preparation method thereof
A technology of thermal insulation material and high emissivity, which can be used in devices, coatings, special surfaces, etc. to apply liquid to the surface. Meet the requirements of brushing and slurry spraying, and resist the effect of thermal shock
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example 1
[0036] (1) Preparation of glass powder: weigh 75% by mass of silicon dioxide and 25% by mass of boron oxide powder, mix them by ball milling in a mixing tank, and then place them in a 1300°C furnace for 2 hours, take them out and quench them. The glass frit is obtained, which is then vibrated and broken and ground into powder for later use;
[0037] (2) Preparation of inner layer transition coating: Weigh 35% by mass glass powder, 2% by mass silicon hexaboride powder and 41% by mass molybdenum disilicide, take absolute ethanol as a solution, anhydrous The mass ratio of ethanol and raw material is 1:1.5. A star ball mill was used for ball milling and mixing treatment at a speed of 180 rpm for 4 h to obtain the inner layer transition layer slurry. The slurry is evenly brushed on the surface of the carbon-based thermal insulation material to form a layer of coating that penetrates into the substrate with a depth of 2mm;
[0038] (3) Preparation of middle-layer anti-oxidation co...
example 2
[0044] (1) Preparation of glass powder: weigh 84% by mass of silicon dioxide and 16% by mass of boron oxide powder and mix them in a mixing tank by ball milling, then place them in a 1350°C furnace for 3 hours, take them out and quench them, The glass frit is obtained, which is then vibrated and broken and ground into powder for later use;
[0045] (2) Preparation of inner layer transition coating: weigh 55% by mass of glass powder, 4% by mass of silicon hexaboride powder, 48% by mass of molybdenum disilicide and 15% by mass of tantalum disilicide, Taking absolute ethanol as a solution, the mass ratio of absolute ethanol and raw material is 1:1.4. A star ball mill was used for ball milling and mixing treatment at a speed of 180 rpm for 4 h to obtain the inner layer transition layer slurry. The slurry is evenly brushed on the surface of the carbon-based thermal insulation material to form a layer of coating that penetrates into the substrate with a depth of 1.5-2mm;
[0046] ...
example 3
[0052] (1) Preparation of glass powder: weigh 90% by mass of silicon dioxide and 10% by mass of boron oxide powder, mix them by ball milling in a mixing tank, then place them in a 1400°C furnace for 4 hours, take them out and quench them. The glass frit is obtained, which is then vibrated and broken and ground into powder for later use;
[0053] (2) Preparation of inner layer transition coating: weigh 42% by mass of glass powder, 1% by mass of silicon hexaboride powder, 2% by mass of silicon tetraboride powder, and 20% by mass of disilicide Molybdenum and tantalum disilicide with a mass percentage of 35% are used as a solution in absolute ethanol, and the ratio of absolute ethanol to raw material mass is 1:1.1. A star ball mill was used for ball milling and mixing treatment at a speed of 200 rpm for 4 h to obtain the inner layer transition layer slurry. The slurry is evenly brushed on the surface of the carbon-based thermal insulation material to form a layer of coating that ...
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