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Principle of inner layer processing of multi-layer automotive PCB soft and hard board

source:Industry News release time:2021-11-24 Article author:sznbone Popular:pcb

  Principle of inner layer processing of multi-layer automotive PCB soft and hard board(图1)

  One, brown oxidation:

  The black oxidation treatment product of the multilayer board of the automotive rigid-flex board manufacturer is mainly copper oxide, which is a misinformation in the industry. Through electro-specific chemical analysis (ESCA) analysis, the binding energy of copper and oxygen atoms on the oxide surface and the ratio of copper atoms to oxygen atoms can be determined. Clear data and observation analysis show that the blackening product is copper oxide with other components.

  Typical ingredients of blackening liquor: oxidizing agent sodium chlorite, pH buffer trisodium phosphate, sodium hydroxide, surfactant, or basic copper ammonium carbonate solution (25% ammonia)

  2. Related data

  1. Peel strength 1 oz copper foil at a speed of 2 mm/min, the width of the copper foil must be 1/8 inch, and the pulling force must be at least 5 pounds/inch.

  2. The weight of oxides can be determined by gravimetric method, generally controlled at 0.2---0.5mg/cm2.

  3. Through variable analysis (ANDVA: Variable Analysis), the main factors affecting tearing strength are:

  The interaction of sodium hydroxide concentration, sodium chlorite concentration, trisodium phosphate and soaking time

  The interaction of sodium chlorite and trisodium phosphate concentration

  "Because the tear strength depends on the amount of charge of the resin to the oxide crystal structure, it is also related to the relevant parameters of the lamination and the relevant properties of the resin pp.

  The optimal length of oxide needle crystals is 0.05 mils (1-1.5um), in this case, the tear strength is also relatively large.


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