Device for preparing thin film by liquid level drawdown method

Abstract

The invention relates to a device for preparing a thin film by a liquid level drawdown method, which controls the stable liquid level drawdown of sol by utilizing the principle of hydraulics and realizes uniform film coating on a substrate. The device mainly comprises a hydraulic piston, a hydraulic piston sleeve, a substrate bracket and the like. The uniform film coating of the sol on the surface of the substrate is implemented by the following steps: hanging the substrate with a clean surface on a sample bracket at a top end, fixing a container accommodating the sol at the top end of the hydraulic piston, closing a liquid outlet of a hydraulic pipeline at the lower end of the device, injecting liquid (water or oil) into the piston sleeve through a liquid inlet by using a hydraulic pump, driving the container accommodating the sol to move upwards by using the piston, and gradually impregnating the hung sample substrate in the sol so as to finish a substrate impregnation process; and stopping injecting the liquid, opening the liquid outlet and making the piston move downwards. The device controls the injection flow rate and drainage flow rate of the liquid by utilizing a flow-limiting valve so as to accurately control the film coating speed and can be charged with a drying gas to control the atmosphere of the film coating environment by a gas passage arranged on the device. Due to the design of small holes on a baffle plate in the device, the airflow disturbance is reduced, thereby ensuring more stable film coating process.

Description

technical field [0001] The invention relates to a device for preparing thin films by a liquid level drop method, which is suitable for various thin films prepared by sol, and relates to the fields of materials, chemistry, physics, machinery, electronics and the like. Background technique [0002] The traditional immersion-pulling method generally adopts the substrate-pulling method to prepare thin films, that is, after the substrate is immersed in the sol, the transmission device is used to lift the substrate out of the liquid surface to realize the coating process. The device provided by the invention fixes the substrate, and uses a simple hydraulic principle to realize the lifting of the liquid level of the sol, thereby completing the coating process on the surface of the substrate. [0003] The advantage of the device over the traditional pull-coating method is that a stable and uniform immersion pull-coating process can be achieved by using a simple current limiting devi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is to improve the shortcomings of the existing sol coating technology such as uneven coating, complicated and expensive equipment, and uncontrollable coating environment, and provide a simple and stable device and method for preparing gel thin films

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