Alumina ceramic is a ceramic material mainly composed of alumina (Al2O3), which is used for thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic washing is required. Alumina ceramic is a kind of ceramics with a wide range of uses. Because of its superior properties, it has become more and more widely used in modern society to meet the needs of daily use and special properties.