Growth device and growth method for obtaining large-sized single crystal material based on solvent evaporation method

A single crystal directional growth method, comprising the following steps:

• S1, placing a seed crystal in a seed crystal fixing groove, assembling and sealing a front plate and a back plate through connecting flanges, and attaching heaters and temperature sensors in array to an outer side surface of an evaporation crystallizer,
• S2, injecting saturated solution of a crystal material into a solution evaporation tank, covering a top of the solution evaporation tank with a semi-permeable membrane, and adjusting an arrayed electric heating temperature control device according to a growth height of a crystal to meet growth temperature gradient distribution;
• and
• S3, gradually reducing the saturated solution in the solution evaporation tank with evaporation until the saturated solution is completely consumed, providing a growth driving force for the seed crystal in a confined crystal growth tank to continuously grow, simultaneously, limiting a growth space of the seed crystal until the seed crystal grows into a large-sized single crystal, and after growth, disassembling and separating the back plate of the evaporation crystallizer to finally obtain a large-sized single crystal product required by a customer.