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WETTABILITY OF PCB SURFACE FINISHES
Minář, Jan ; Jana, Toulová (referee) ; Starý, Jiří (advisor)
This bachelor’s thesis with measuring of wetting characteristics by the wetting balance method for samples of different surface finishes from the firm Gatema. It deals with influence of the isothermal aging and reflow processes on wetting characteristics of surface finishes ENIG, HAL and immersion tin. The influence of intermetallic layer on the overall wettability is studied in case of the surface finish of immersion tin. Also deals with the wettability of the nickel layer, after stripped off gold, in case of the surface finish of ENIG.
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HAL Technology and Selected Parameters Influence on Quality
Jakub, Miroslav ; Jana, Toulová (referee) ; Starý, Jiří (advisor)
Bachelor thesis describes and deals the problems of printed circuit boards production. It focuses on issues of process of lead – free HAL and influence of selected parameters on quality in production process GATEMA s.r.o. in Boskovice. Bachelor thesis contains analysis of PCB using microsection, optical microscopy and a sample of defects created during this process. Bachelor thesis presents on the test boards quality of solder mask developing, evaluates flux contamination with water, residual water on the PCB and it compares the PCB delay in liquid solder. It also determines the limit of non defective cover with the solder and determines the typical thickness of solder mask on the Cu pads and the ratio between the width of font and solder mask thickness.
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WETTABILITY OF PCB SURFACE FINISHES
Minář, Jan ; Jana, Toulová (referee) ; Starý, Jiří (advisor)
This bachelor’s thesis with measuring of wetting characteristics by the wetting balance method for samples of different surface finishes from the firm Gatema. It deals with influence of the isothermal aging and reflow processes on wetting characteristics of surface finishes ENIG, HAL and immersion tin. The influence of intermetallic layer on the overall wettability is studied in case of the surface finish of immersion tin. Also deals with the wettability of the nickel layer, after stripped off gold, in case of the surface finish of ENIG.
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HAL Technology and Selected Parameters Influence on Quality
Jakub, Miroslav ; Jana, Toulová (referee) ; Starý, Jiří (advisor)
Bachelor thesis describes and deals the problems of printed circuit boards production. It focuses on issues of process of lead – free HAL and influence of selected parameters on quality in production process GATEMA s.r.o. in Boskovice. Bachelor thesis contains analysis of PCB using microsection, optical microscopy and a sample of defects created during this process. Bachelor thesis presents on the test boards quality of solder mask developing, evaluates flux contamination with water, residual water on the PCB and it compares the PCB delay in liquid solder. It also determines the limit of non defective cover with the solder and determines the typical thickness of solder mask on the Cu pads and the ratio between the width of font and solder mask thickness.
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