Method for manufacturing high-precision marine conductivity measurement electrode based on screen printing

A method for manufacturing a high-precision marine conductivity measurement electrode based on screen printing, comprising the following steps:

• step I preparing a screen printing screen plate:
• cutting micro-nano-scale array holes on a metal material sheet having a thickness of 0.5-1 mm by using a femtosecond laser technology to obtain the screen printing screen plate;
• step II preparing a platinum electrode slurry:
• mixing a nano platinum powder, a metal powder, a metal oxide and an organic vehicle, wherein the nano platinum powder has an average particle size of 0.08 μm, and the metal powder and the metal oxide have a particle size of 0.1-0.3 μm;
• dispersing and milling the mixture for 20-40 min in a three-roll mill, and discharging residual air under a vacuum degree of −80 KPa to −90 KPa by using a vacuum defoaming device to prepare the platinum electrode slurry;
• step III preparing an electrode carrier:
• selecting a silicon-based substrate, etching a groove having a depth of 0.2-0.4 μm on a surface of the silicon-based substrate, and performing a nitridation treatment on a surface of the groove as the electrode carrier;
• step IV printing the platinum electrode slurry onto the electrode carrier by using the prepared screen printing screen plate and a scraping plate on a semi-automatic screen printer, scraping off the platinum electrode slurry outside the groove, standing for 5-10 min, and forming a patterned membrane electrode having a micron-scale thickness after the platinum electrode slurry is leveled;
• and
• step V placing the electrode carrier printed with the patterned membrane electrode in a blast drying oven for drying for 10-20 min at 115-135° C., and finally performing microwave sintering to obtain the conductivity measurement electrode.