Assembly method of expanded graphite reinforced heat conduction ceramic-based shaped high-temperature phase change heat storage element and heat storage element formed by assembly method
An assembly method and technology of expanded graphite, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy corrosion, low thermal conductivity, etc., and achieve the effect of high heat exchange efficiency and high heat storage density
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Embodiment 1
[0019] NaCl, KCl, MgCl 2 Mix by ball milling at a eutectic ratio of 5:3:2, dry, heat to 560°C in a reaction kettle protected by 2 atmospheres and argon, and equilibrate for 4 hours until the salt is completely melted to form a uniform eutectic salt.
[0020] The natural flake graphite is expanded, and then subjected to high-temperature graphitization treatment to remove impurities to obtain expanded graphite.
[0021] Alumina powder and 6% methylcellulose were evenly mixed to form a skeleton material.
[0022] The skeleton material and the eutectic salt are uniformly mixed according to a mass ratio of 3:2 to form a composite phase change material, and 10wt% of expanded graphite is added to the composite phase change material as a heat conducting agent.
[0023] A uniaxial static pressure process is used to press and form under the condition of a pressure of 12-14 MPa to obtain a columnar green body.
[0024] The heat storage element was obtained by sintering at 520°C, and it...
Embodiment 2
[0026] NaCl, KCl, MgCl 2 Mix by ball milling at a eutectic ratio of 5:3:2, dry, heat to 560°C in a reaction kettle protected by 2 atmospheres and argon, and equilibrate for 4 hours until the salt is completely melted to form a uniform eutectic salt.
[0027] The natural flake graphite is expanded, and then subjected to high-temperature graphitization treatment to remove impurities to obtain expanded graphite.
[0028] Alumina powder and 6% methylcellulose were evenly mixed to form a skeleton material.
[0029] The skeleton material and the eutectic salt are uniformly mixed according to a mass ratio of 3:2 to form a composite phase change material, and 15wt% of expanded graphite is added to the composite phase change material as a heat conducting agent.
[0030] A uniaxial static pressure process is used to press and form under the condition of a pressure of 12-14 MPa to obtain a columnar green body.
[0031] Sintering at 520°C to obtain a heat storage element.
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