A method for preparing large-scale gallium lanthanum silicate crystals in batches
A large-size gallium lanthanum silicate technology, which is applied in the field of batch preparation of large-size gallium lanthanum silicate crystals, to achieve mass production, reduce processing loss and man-hours, and overcome high preparation costs
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Embodiment 1
[0040] High purity La 2 o 3 , Ga 2 o 3 and SiO 2 The molar ratio of the powder is 3:5(1+x):(1-y) ingredients (x=0~0.008, y=0~0.01), with alcohol and agate balls as the mixing medium, at 60 rpm Mixed by wet ball milling for 20 hours, then dried, isostatically pressed into a dense cylindrical block, and sintered at 1300°C for 15 hours. The obtained polycrystalline blocks were put into three platinum crucibles of Φ76.2×200mm respectively, the thickness of the crucible was 0.3mm, and the orientation seed crystal of Φ76.2×50mm was placed on the bottom of the crucible in advance, and placed in the descending furnace Position, the furnace temperature is controlled at 1510°C, the crucible drops at a rate of 0.4mm / h after the top of the seed crystal is melted and kept for 8 hours, and the furnace temperature is raised at a rate of 1.5°C / day. After 18 days of growth, all the raw materials crystallize and stop falling. The furnace temperature is slowly lowered to 400°C at a rate of...
Embodiment 2
[0042] High purity La 2 o 3 , Ga 2 o 3 and SiO 2 The molar ratio of the powder is 3:5(1+x):(1-y) ingredients (x=0~0.008, y=0~0.01), with alcohol and agate balls as the mixing medium, at 60 rpm Mixed by wet ball milling for 20 hours, then dried, isostatically pressed into a dense cylindrical block, and sintered at 1300°C for 15 hours. The obtained polycrystalline material blocks were put into three platinum crucibles of Φ76.2×200mm respectively, the thickness of the crucible was 0.3mm, and a Φ76.2×50mm The oriented seed crystal is placed in a proper position in the descending furnace, the furnace temperature is controlled at 1520°C, the top of the seed crystal is melted and kept for 5 hours, the crucible is lowered at a rate of 0.4mm / h, and the furnace temperature is raised at a rate of 1.5°C / day. After 18 days of growth, all raw materials crystallize and stop falling. The furnace temperature is slowly cooled to 400°C at a rate of 20°C / h, and then cooled to room temperatu...
Embodiment 3
[0044] High purity La 2 o 3 , Ga 2 o 3 and SiO 2 The molar ratio of the powder is 3:5(1+x):(1-y) ingredients (x=0~0.01, y=0~0.01), with alcohol and agate balls as the mixing medium, at 60 rpm Mixed by wet ball milling for 20 hours, then dried, isostatically pressed into a dense cylindrical block, and sintered at 1350°C for 10 hours. The obtained polycrystalline blocks were put into three platinum crucibles of Φ101.6×200mm respectively, the thickness of the crucible was 0.4mm, and the orientation seed crystal of Φ101.6×50mm was placed on the bottom of the crucible in advance, and placed in the descending furnace Position, the furnace temperature is controlled at 1510°C, the top of the seed crystal is melted and kept for 10 hours, the crucible is lowered at a rate of 0.35mm / h, and the furnace temperature is raised at a rate of 2°C / day. After 20 days of growth, all the raw materials crystallize and stop falling. The furnace temperature is slowly cooled to 400°C at a rate of...
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