Kyropoulos method for quickly growing large-size sapphire single crystal
A growth method, sapphire technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of long growth cycle, low crystal yield, limited popularization and application, etc., and achieve short growth cycle and large growth crystal size , the effect of broad application prospects
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[0027] Embodiment 1: The specific process of this embodiment is as follows:
[0028] (1) Furnace loading: 31 kg of high-purity alumina raw material (purity> 99.997%) Loaded into the crucible of the single crystal furnace, the 12mm diameter A-direction (or C-direction, M-direction, R-direction) seed crystals that have been accurately oriented are first mounted on the seed crystal holder, and the seed crystal orientation accuracy is ±0.1o , Then install the seed crystal clamp on the seed rod, close the single crystal furnace cover, start the cooling water circulation system, adjust the cooling water flow, and control the outlet water temperature within the range of 27±1℃;
[0029] (2) Vacuum: start the vacuum system to make the pressure in the furnace reach 10 -3 Pa.
[0030] (3) Heating material: start the heating system, adjust the heating voltage, and heat at a heating rate of 400°C / h. When the temperature reaches 2150°C, stop heating. At this time, the raw materials are all melted;...
Example Embodiment
[0039] Embodiment 2: The specific process of this embodiment is as follows:
[0040] (1) Furnace loading: 85 kg of high-purity alumina raw material (purity> 99.997%) Loaded into the crucible of the single crystal furnace, the accurately oriented 18mm diameter A-direction (or C-direction, M-direction, R-direction) seed crystals are first mounted on the seed crystal holder, and the seed crystal orientation accuracy is ±0.1o , Then install the seed crystal clamp on the seed rod, close the single crystal furnace cover, start the cooling water circulation system, adjust the cooling water flow, and control the outlet water temperature within the range of 27±1℃;
[0041] (2) Vacuum: start the vacuum system to make the pressure in the furnace reach 10 -3 Pa.
[0042] (3) Heating the material: start the heating system, adjust the heating voltage, and heat at a heating rate of 200°C / h. When the temperature reaches 2150°C, stop heating. At this time, all the raw materials are melted; after hold...
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