Meaning
Vacuum deposition processes apply a thin, highly conductive metal layer to sensor surfaces. When manufacturing piezoelectric sensors for high temperature mould monitoring, platinum sputtering creates stable electrical electrodes on the crystal faces. This deposition method generates a uniform layer that resists delamination under the extreme pressure and shear forces of the polymer flow.
Electrode Durability
High kinetic energy during deposition forces platinum atoms to bond tightly to the quartz or ceramic substrate. In the abrasive environment of glass-filled polymer moulding, platinum sputtering produces an electrode that resists physical wear. This durability prevents the sensor from losing its electrical contact during long production runs, ensuring continuous pressure measurements.
The sputtered film also resists the intense cyclic shear forces that occur as the highly viscous melt front passes directly over the sensor face, avoiding surface flaking.
Thermal Stability
Platinum maintains its electrical conductivity and resists oxidation at high operating temperatures. Because some polymers require processing temperatures up to four hundred degrees celsius, electrodes must not degrade or react with the polymer outgassing. The sputtered platinum layer ensures that the electric charge generated by the piezoelectric effect is transmitted to the acquisition system without signal loss.
Signal Precision
Uniform electrode thickness prevents localized charge concentration and improves signal linearity. When the sensor measures cavity pressure, the sputtered electrodes ensure that the output signal corresponds precisely to the mechanical force applied by the melt. This precision allows the machine controller to detect the exact moment of cavity packing.
