What is ultrasonic spraying?

Ultrasonic spraying, also known as ultrasonic spraying, is a spraying process that uses ultrasonic atomization technology. The material to be sprayed is first in a liquid state. The liquid can be a solution, sol, suspension, etc. The liquid paint is first atomized into fine particles through an ultrasonic atomization device, and then is evenly coated on the surface of the substrate through a certain amount of carrier gas. , thereby forming a coating or film. The biggest difference between ultrasonic spraying and traditional single-fluid or two-fluid spraying is that the atomizing device or atomizing nozzle uses an ultrasonic atomizing device, that is, an ultrasonic nozzle.

ultrasonic coatingCompared with traditional two-fluid spraying, ultrasonic spraying has the advantages of high coating uniformity, high raw material utilization, high coating thickness control accuracy, thinner coating thickness, less spatter, no nozzle clogging, and low maintenance costs. Compared with coating processes such as vacuum evaporation and CVD, ultrasonic spraying is a more economical thin film coating process. Especially in the preparation of larger-area thin films, the equipment cost of ultrasonic spraying is lower than that of vacuum coating equipment.
The main advantages of ultrasonic spraying are:
1. High coating uniformity
The uniformity of liquid particle distribution after atomization by ultrasonic nozzles is significantly higher than that of two-fluid nozzles, commonly known as air spray guns, so the uniformity of the coating after spraying by ultrasonic nozzles is also improved. Normally, the coating uniformity of ultrasonic spraying can reach more than 95%.
2. High utilization rate of raw materials and less splashing
Since ultrasonic spraying is liquid atomization through ultrasonic oscillation, the process of atomizing the paint does not require any gas, that is, the atomization process does not require pressure. Only a very low carrier gas pressure is applied after atomization to transport the liquid mist. Therefore, It greatly reduces the liquid rebound and splash caused by the high-pressure air spraying of the second fluid, thus greatly improving the utilization rate of the paint. The raw material utilization rate of ultrasonic spraying is more than 4 times that of ordinary air spraying, and the utilization rate can reach up to more than 90%.
3. High coating thickness control accuracy
The main factor affecting the coating thickness accuracy is the spraying flow rate of the coating, which is the amount of material loaded on the substrate per unit time. The ultrasonic nozzle has no pressure effect on the liquid, so the flow rate of the atomized spray paint liquid can be completely controlled by the high-precision metering pump, thus achieving high-precision spray flow control. For example, the flow control accuracy of a high-precision syringe pump can reach the level of picolitres per second, and the micro-channel design of the ultrasonic nozzle can also achieve overall control accuracy of nanoliters per second.
4. The coating thickness is thin, reaching tens of nanometers
Since the spray volume of the ultrasonic nozzle can achieve an extremely low stable flow rate (0.001ml/min), a very small amount of loading can be achieved on the substrate, thereby achieving a very thin dry film. For some nanomaterials, the dry film thickness can be as low as tens of nanometers. It can be used to prepare glass films such as transparent conductive films, anti-reflection films, thermal insulation films, hydrophilic and hydrophobic films.

Post time:Jan-04-2024

Post time: 01-04-2024
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