Surface-toughened alumina fiber rigid insulation tile multilayer composite material, coating composition, preparation method and application thereof
A composition, aluminum oxide technology, applied in applications, other household appliances, household appliances, etc., can solve problems such as insufficient temperature resistance
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Embodiment 1A
[0143] Example 1A uses cryogel injection molding method to prepare alumina fiber rigid insulation tile multilayer composite material matrix A
[0144] Alumina fiber cotton and acidic silica sol were mixed at a mass ratio of 1:200, placed in a dispersion bucket, and the concentration of silica sol was controlled to be 9% by mass. A paddle-type shear mixer was used to disperse the alumina fiber cotton, the stirring speed was controlled at 2500 rpm, and the stirring time was controlled at 20 minutes. After the stirring is finished, transfer the ceramic slurry to a tooling with a filter screen for filtration. The filter screen used is a 50-mesh wire mesh. The alumina fiber impregnated with the acidic silica sol is retained, and the filter cake forms an alumina fiber heat-insulating tile. Blank. According to the design, the target density of the required rigid insulation tile multilayer composite material is 0.40g / cm 3 , apply pressure to the wet billet to press it to a thickness...
Embodiment 6A
[0148] In addition to the content shown in Table 1 below, Examples 2 to 5 were carried out in substantially the same manner as in the Examples, except that after filtration, the wet body mold was transferred to a pressure forming machine, and a pressure of 2.5 MPa was applied to obtain For the ceramic fiber thermal insulation tile wet billet, put the wet billet into a microwave oven to dry at 120° C. After the frozen billet is completely dried, a dry billet is obtained, which is then sintered and processed.
[0149] Table 1 Preparation of Matrix A
[0150]
[0151] Note: The mass ratio is the mass ratio of alumina fiber and acidic silica sol.
Embodiment 1B
[0152] The coating of embodiment 1B dense ceramic layer B
[0153] The preparation composition is a dense ceramic layer composition composed of 1 part of alkaline silica sol with a mass fraction of 25%, 0.7 part of alumina sol with a mass fraction of 40%, and 0.3 part of aluminum nitride powder with a particle size of 1 micron, using acrylamide Viscosity is adjusted to obtain a ceramic sol suspension precursor. After brushing the suspension precursor to the surface of the substrate A prepared in Example 1 for the preparation of a dense ceramic layer B (coating thickness 4mm), allow it to dry at room temperature, and then further After solidification, a dense ceramic layer B was formed, and then the density of the coating B was measured, and the results are shown in Table 2 below.
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