Preparation method and application of zirconia ceramic composite shell
A technology of zirconia ceramics and nano-zirconia, applied to the structure of telephones, etc., can solve the problems of low strength, limited improvement of wear resistance, non-wear resistance, etc., achieve enhanced strength and surface hardness, solve non-wear resistance, and cost cheap effect
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[0023] A method for preparing a zirconia ceramic composite shell, which is prepared according to the following steps:
[0024] a) Use a surface modifier to wrap and modify the surface of the zirconia nanopowder with a tetragonal phase content greater than 95% to improve its compatibility with organic matter. In this example, the preferred nano-zirconia powder has a median particle size D50 in the range of 10nm~200nm, and there is no direct requirement for the modifier of the zirconia powder. In this example, a surface modifier that accounts for 0.3% to 1% by weight of zirconia is used to modify and wrap zirconia powder, so that the surface energy of zirconia powder is reduced, and it is easy to bond with organic polymer materials. The modifier is wrapped more evenly. The preferred modification process is wet stirring ball milling, and the solvent is ethanol or deionized water, or a combination of the two. Wherein, the surface modifier is preferably one or a combination of ste...
Embodiment 1
[0032] Take by weighing 200g stearic acid and add in the stirring mill that has zirconia ball, then add 7kg ethanol, then weigh 20kg median diameter D50 to be 10nm ZrO 2 (the content of the tetragonal phase is 96.1%), add it into the stirring mill and stir for 1.5h, then dry it in the oven to obtain the stearic acid modified ZrO 2 pink.
[0033] Weigh 3.34kg of polyphenylene sulfide and add it to the internal mixer and heat it up to 315°C to melt it, then weigh 10kg of modified ZrO 2 Add the powder into the internal mixer several times, then close the internal mixer and evacuate to -0.05MPa, banbury at 320°C for 1 hour, then cool down and discharge the material, and pulverize it to obtain the feed. Feed the material into the hopper of the injection molding machine, pump the cavity of the 1.55-inch case mold to -0.07MPa, set the temperature of the injection molding machine to 330°C, and the injection pressure to 150MPa for injection molding, and set the temperature of the seco...
Embodiment 2
[0037] Weigh 60g of ammonium stearate and add it into a stirring mill with zirconia balls, then add 7kg of ethanol, then weigh 20kg of 8Y-ZrO with a median particle size D50 of 200nm 2 (the content of the tetragonal phase is 95.4%) was added into a stirring mill and stirred for 2 hours, and then dried in an oven to obtain ammonium stearate-modified zirconia powder.
[0038] Weigh 6.67kg of polycarbonate and add it to the internal mixer and heat it up to 270°C to melt it, then weigh 10kg of modified zirconia and add it to the internal mixer several times, then close the internal mixer and evacuate to -0.08MPa at 275 After banburying at ℃ for 4 hours, the temperature was lowered and the material was crushed to obtain the feed. Put the feed into the hopper of the injection molding machine, pump the cavity of the 1.52-inch case mold to -0.09MPa, set the temperature of the barrel of the injection molding machine at 285°C, and inject the feed into the sprue when the injection pressu...
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