Electroless Nickel Plating: Pcb Process Modelling and Estimation
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چکیده
منابع مشابه
Bath and Deposit Monitoring System for Electroless Nickel Plating Process
Electroless nickel plating is a widely used plating method in many industries. The usability of the coating is, however, restricted by the control problems related to the electroless nickel plating process. To ensure deposit quality, the transcendent properties of electroless nickel deposit should be accurately controlled during plating, which is challenging because of the spontaneous, unstable...
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In the previous chapter, the components of electroless nickel plating baths were discussed from the viewpoint of the function each performs in the bath, with little attention paid to their effect on the plating process. The metal and the electron source (the reducing agent) are consumed in the electroless plating reaction and so their concentrations in the bath are continuously decreasing. Ther...
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For solder based flip-chip assembly, the deposition of an under bump metallisation (UBM) layer onto the surface of the AI bondpads of the die is the first step in the wafer bumping process. The UBM is necessary, as the fragile AI pad has a tenacious oxide layer that cannot be soldered without the use of strong fluxes and a barrier layer is required to prevent dissolution of the bondpad into the...
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In this paper, bath control is proposed for the electroless nickel plating through holes board process. The main parameters of the product (board) – thickness of the plating film and phosphorous content – are stabilized at constant levels using optimal tracking control. The set point for control is calculated from the model in dependence on the current state of the process. The pH-index and nic...
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This work connects the neocybernetic theory of elastic systems to modeling of a complex industrial process. It turns out that using simple mathematics combined with multilinear tools leads to linear models that can be used for monitoring and control. As an application example, electroless nickel plating is studied.
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