Preparation method of polycrystalline sapphire transparent thin plate
A sapphire and transparent technology, applied in the field of preparation of polycrystalline sapphire transparent sheets, can solve the problems of difficult water-based solvent molding, pollution, organic solvent volatilization environment, etc.
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[0011] A preparation method for a polycrystalline sapphire transparent thin plate, comprising the following steps:
[0012] Slurry preparation: put clean alumina grinding balls into the sand mill, the ratio of grinding balls to alumina powder is 5:1, weigh deionized water, dispersant, defoamer, and sintering aid in nano In the sand mill, add alumina powder according to the formula, start the nano sand mill; add binder and plasticizer after 2 hours, continue to grind for 2 hours and then stop, wherein the average particle size of alumina powder is 0.2 ~0.5μm spherical or quasi-spherical alumina powder, the binder is one or more of polyvinyl alcohol, water-based acrylic resin, and styrene-acrylic emulsion, and the dispersant is a high molecular weight block copolymer containing pigment affinity groups Solution DISPERBYK190, the plasticizer is Amgard TBEP, the defoamer is tego foamex 840 of Tego, and the sintering aid is one or both of nano-magnesium oxide dispersion and nano-ytt...
Embodiment 1
[0018] Example 1: Prepare slurry according to the following formula: add 50% of alumina powder, add 1% of dispersant DISPERBYK190, 2% of polyvinyl alcohol and styrene-acrylic emulsion, 1% of plasticizer Amgard TBEP, defoamer tego foamex 840 1 %, deionized water 42.8%, sintering aid nano magnesium oxide dispersion 0.2%;
[0019] Put clean alumina grinding balls into the sand mill, the ratio of grinding balls to alumina powder is 5:1; put the weighed deionized water, dispersant, defoamer, and sintering aid in the nano sand mill , add the weighed alumina powder, start the nano-sand mill; add binder and plasticizer after 2 hours, continue grinding for 2 hours and then stop the machine; transfer the ground slurry to a vacuum stirring and defoaming machine, vacuum Degassing for 0.5 to 1 hour, take samples to test the viscosity, stop defoaming when the viscosity reaches 2000~3000mPa·S; The formed green ceramic belt (that is, the above-mentioned cast film belt) is cut into 300*300 pr...
Embodiment 2
[0020] Embodiment 2: Prepare slurry according to the following formula: add 55% of alumina powder, add 2% of dispersant DISPERBYK190, 2% of polyvinyl alcohol, 1% of styrene-acrylic emulsion, 1% of water-based acrylic resin, plasticizer Amgard TBEP1. 5%, add 1% of defoamer tego foamex 840, add 36% of deionized water, add 0.5% of nano magnesium oxide dispersion sintering aid;
[0021] Put clean alumina grinding balls into the sand mill, the ratio of grinding balls to alumina powder is 5:1; put the weighed deionized water, dispersant, defoamer, and sintering aid in the nano sand mill , add the weighed alumina powder, start the nano sand mill;,, add the binder and plasticizer after 2 hours, continue grinding for 2 hours, then stop the machine; transfer the ground slurry to the vacuum stirring and defoaming machine , vacuum defoaming for 0.5 to 1 hour, sampling to test the viscosity, stop defoaming when the viscosity reaches 2000 to 3000mPa·S; use a casting machine to cast, accordi...
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