First, PCB board temperature performance
The temperature resistance of pcb production board means that in a high temperature environment, the board will not embrittlement, cracking, deformation and other phenomena. Therefore, the temperature resistance of the board is very important.
Under normal circumstances, the temperature resistance of PCB processing is affected by many factors such as material, manufacturing process, circuit structure and so on. Among them, the material is the main factor affecting the temperature resistance of the PCB board.
Second, the temperature resistance of commonly used materials of PCB board
1. FR-4 material
FR-4 is a glass fiber reinforced epoxy material commonly used in PCBA manufacturing. The temperature resistance of FR-4 material is usually about 130 ° C, and exceeding this temperature will cause deformation or failure of the board.
Due to the advantages of low manufacturing cost, high cost performance and good processability, FR-4 materials are also widely used in the high-end electrical industry and have been tested by long-term practice. However, for high temperature applications, the temperature resistance of FR-4 materials is not enough.
2. High temperature FR-4 material
High temperature FR-4 is a glass fiber reinforced epoxy material specially designed for high temperature environments. Compared with FR-4 materials, high-temperature FR-4 materials have better temperature resistance and can withstand temperatures of up to 150 ° C or more.
Although the manufacturing cost of high temperature FR-4 is high, its reliability in high temperature environment is far better than the general FR-4, so it has been widely used in the high-end electrical equipment industry.
3. Polyimide material
Polyimide is a kind of high performance insulating material, with excellent high temperature resistance, chemical corrosion resistance, electromagnetic wave interference and other characteristics. It is one of the most excellent high temperature resistance materials on the market, which can withstand high temperatures above 380 ° C, and very few brands of polyimide materials can even withstand high temperatures above 500 ° C.
At present, polyimide materials are mainly used in aerospace, military and high-precision temperature measurement equipment. Although polyimide materials are expensive, their reliability at high temperatures is unmatched by other materials.
Iii. Conclusion
In summary, the PCB factory board temperature can reach a maximum of 500 ° C or more, depending on the material used on the board. In general electrical equipment and meters, we commonly use FR-4 or high temperature FR-4 materials, which can meet most of the application needs. However, in some special applications, such as aerospace, military and other industries, it is necessary to use high-performance materials such as polyimide.
Therefore, when selecting PCB board materials, it is necessary to select the material type and temperature resistance level according to the actual application to ensure that the circuit board has good reliability and stability in a high temperature environment.
