Leak-proof honeycomb grade hole ceramic-based photo-thermal storage material and preparation method thereof
A storage material, honeycomb technology, applied in the field of graded porous ceramic-based photothermal storage materials and preparation, can solve the problems of increasing cost, increasing thermal resistance of heat transfer medium and phase change material, reducing heat transfer efficiency, etc. Conductivity, efficient light-to-heat conversion and heat storage capacity, the effect of avoiding complexity
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Embodiment 1
[0026] Take 7g of aluminum nitride powder with an average particle size of 2μm, 3g of aluminum nitride whiskers with a length of 10μm and a diameter of 0.5μm, 0.3g of yttrium oxide, 0.1g of polyvinyl butyral ester, add 15.53g of tert-butanol, and ball mill Mix for 2 hours; pour the uniform slurry mixed by the ball mill into a mold with a copper plate at the bottom and rubber around it;
[0027] Put the mold poured into the slurry into a freeze-drying box for freeze-drying, freeze at -50°C for two hours, then vacuumize to 5Pa for drying, take out the sample two days later, remove the mold, and make green embryos; the prepared green embryos Put it in a hot-press furnace and heat it to 1950°C under a nitrogen atmosphere, keep it warm for 4 hours, and get a honeycomb-shaped porous aluminum nitride framework with good strength and hardness after sintering, see image 3 , the thermal conductivity is 21W / m-K when the porosity is 80% measured by laser thermal conductivity meter. Conf...
Embodiment 2
[0031] Take 6g of aluminum nitride powder with an average particle size of 2μm, 4g of aluminum nitride whiskers with a length of 5μm and a diameter of 1μm, 0.3g of yttrium oxide, 0.1g of polyvinyl butyral ester, add 16.54g of tert-butanol, and mix by ball milling 2h; Pour the uniform slurry mixed by the ball mill into a mold with a copper plate at the bottom and rubber around it;
[0032] Put the mold poured into the slurry into a freeze-drying box for freeze-drying, freeze at -55°C for two hours, then vacuumize to 6Pa for drying, take out the sample two days later, remove the mold, and make green embryos; the prepared green embryos Put it in a hot-press furnace and heat it to 1900°C under a nitrogen atmosphere, keep it warm for 3 hours, and get a honeycomb-shaped hierarchical porous aluminum nitride framework with good strength and hardness after sintering. Configure a mixed solution of titanium nitride nanoparticles and ethanol with a mass ratio of 3:100, place the prepared ...
Embodiment 3
[0035] Take 7g of aluminum nitride powder with an average particle size of 2μm, 3g of aluminum nitride whiskers with a length of 15μm and a diameter of 0.1μm, 0.3g of yttrium oxide, and 0.1g of polyvinyl butyral ester, add 15.53g of tert-butanol, and ball mill Mix for 2 hours; pour the uniform slurry mixed by the ball mill into a mold with a copper plate at the bottom and rubber around it;
[0036]Put the mold poured into the slurry into a freeze-drying box for freeze-drying, freeze at -50°C for two hours, then vacuumize to 5Pa for drying, take out the sample two days later, remove the mold, and make green embryos; the prepared green embryos Put it in a hot-press furnace and heat it to 2000°C under a nitrogen atmosphere, keep it warm for 4 hours, and get a honeycomb-shaped hierarchical porous aluminum nitride framework with good strength and hardness after sintering. Configure a mixed solution of titanium nitride nanoparticles and ethanol with a mass ratio of 5:100, place the ...
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