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What is the temperature resistance of PCB circuit board

2020/01/09 16:52
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What is the temperature resistance of PCB circuit board
In order to ensure the quality of the PCB circuit board, a temperature resistance test is required. The purpose is to prevent the PCB circuit board from adverse reactions such as bursting, blistering, delamination, etc. at excessively high temperatures, which leads to poor product quality or direct scrap. The problem. So how much is the temperature resistance of PCB circuit board, how to do heat resistance test?
What is the temperature resistance of PCB circuit board
The temperature problem of the PCB circuit board is related to the temperature of the raw materials, solder paste, and surface parts. Generally, the PCB circuit board can withstand a maximum temperature of 300 degrees, 5-10 seconds; the temperature is about 260 when the lead-free wave soldering is used, and the lead when It's 240 degrees.
Heat resistance test of PCB circuit board:
1. First prepare the PCB circuit board production board and tin furnace.
5pcs sampled 10 * 10cm substrate (or laminated board, finished board) (no blistering or delamination on copper substrate)
Substrate: 10cycle or more
Pressing board: LOWCTE15010cycle or more
HTg material: more than 10cycle
Material: 5cycle or more
Finished board: LOWCTE1505cycle or more; HTg material is more than 5cycle; Normal material is more than 3cycle.
2. Set the temperature of the tin furnace to 288 ± 5 degrees, and adopt the contact temperature measurement and correction;
3. First immerse flux with a soft brush and apply it to the surface of the board. Then use the crucible pliers cheek to take the test board and immerse it in a tin furnace. Take it out for 10 seconds and cool it to room temperature. Visually check for blistering. ;
4. If there is a problem with the blistering and blasting board visually, stop immersion tin analysis and analyze the detonation point f / m immediately. If there is no problem, continue the cycle until the blasting board, with 20 times as the endpoint;
5. The blistering area needs to be sliced ​​to understand the source of the explosion point, and take pictures.
I believe everyone knows the above about the temperature resistance of PCB circuit boards. PCB circuit board will produce some bad problems at overheated temperature. Therefore, it is necessary to know in detail the temperature resistance of PCB circuit boards made of different materials, and not exceed its maximum limit temperature, so as to avoid the PCB circuit board from being scrapped and increased. cost.