Method for preparing compact-type porous ceramic-based titanium electrothermal film
A porous ceramic and pocket-sized technology, which is applied in the direction of electric heating devices, ceramic products, ohmic resistance heating, etc., can solve the problems of complex preparation process and environmental pollution of porous metal electric heating film, and achieve specific strength, safety, non-toxicity, simple preparation process, greater than strength effect
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Embodiment 1
[0020] Take 20g of titanium powder with a particle size of about 1um and 40g of 6% polyvinyl alcohol aqueous solution and put them into a stainless steel ball mill tank with a rotation speed of 300r / min and a ball milling time of 12h to finally obtain a stable titanium slurry with a porosity of 70%. , Diatom mud ceramics with a pore size of 1-10um, using a spraying process, spray titanium slurry on the porous diatom mud ceramic substrate, level it at room temperature for 10 minutes, and dry it in an oven at 80 ° C. According to the resistance value, it can be used multiple times Spraying, drying samples were sintered in a vacuum tube furnace with a vacuum of 10 -3 Below pa, the sintering temperature is 800°C, the time is 2h, and the porous ceramic base titanium heating film can be obtained by natural cooling, and the resistance is about 5-20Ω.
Embodiment 2
[0022] Take 20g of titanium powder with a particle size of about 1um and 40g of 6% polyvinyl alcohol aqueous solution and put them into a stainless steel ball mill tank with a rotation speed of 300r / min and a ball milling time of 12h to finally obtain a stable titanium slurry with a porosity of 50%. , Alumina ceramics with a pore size of 10-20um, using a spraying process, spray titanium slurry on the porous alumina ceramic substrate, level it at room temperature for 10 minutes, dry it in an oven at 80°C, and spray it multiple times according to the resistance value. High-purity argon is used as the protective gas to sinter in a tube furnace, the sintering temperature is 1000°C, and the time is 1h. The porous ceramic-based titanium heating film can be formed by natural cooling, and the resistance is about 10-30Ω.
Embodiment 3
[0024] Take 10g of titanium hydride with a particle size of about 5um and 40g of 4% polyvinyl butyral ethanol solution and put them into a stainless steel ball mill tank with a rotational speed of 300r / min and a ball milling time of 1h to finally obtain a stable Titanium hydride slurry, select alumina ceramics with a porosity of 40% and a pore diameter of 20-30um, use a spraying process, spray titanium slurry on the porous alumina ceramic substrate, level it at room temperature for 10 minutes, and bake it in an oven at 80°C Dry, it can be sprayed multiple times according to the resistance value, and the dried sample is sintered in a vacuum tube furnace with a vacuum of 10 -3 Below pa, heat at 500°C for 2 hours to completely decompose titanium hydride into elemental titanium, sinter at 600°C for 8 hours, and naturally cool down to form a porous ceramic-based titanium heating film with a resistance of about 2-10Ω.
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