Classification of alumina ceramic substrates
There are many classifications of alumina ceramic substrates. Today, let's talk about several common ceramic substrates.
1. Ceramic substrate for chip resistor
Alumina ceramic substrate is widely used at present because its production process is relatively simple. It is generally prepared by tape casting. 96% alumina ceramic substrate material is added with appropriate mineral raw materials as cosolvent. The firing temperature is as low as 1580 ℃ ~ 1600 ℃, and the product density can reach more than 3.75g/cm.
Ceramic substrate has the main advantages of small volume, light weight, high temperature resistance, high electrical insulation performance, low dielectric constant and dielectric loss, large thermal conductivity, good chemical stability, similar to the thermal expansion coefficient of components, which greatly improves the reliability and wiring density of the circuit. It is the carrier material of chip resistance components.
2. Ceramic substrates for thick film hybrid integrated circuits
It has good thermal cycle performance, with 50000 cycles and high reliability. Like PCB board (or IMS substrate), it can etch the structure of various graphics; No pollution and pollution. The coefficient of thermal expansion is close to that of silicon, which simplifies the production process of power module.
The ceramic substrate formed by tape casting has good flatness, smooth surface and good electrical properties; High thermal conductivity and thermal expansion coefficient matching with other materials; Good mechanical properties; High temperature and high pressure resistance, high stability.
It is applied to ceramic copper clad laminate, ceramic circuit board, ceramic heating board, thick film circuit board and other products.
3. Ceramic substrate for LED
The ceramic substrate for LED has the characteristics of high heat dissipation and high air tightness, which can improve the luminous efficiency and service life of LED. With good air tightness, it has the advantages of high weather resistance and can be used in various environments.
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