A kind of silver paste for core-through capacitor and preparation method thereof
A core-through capacitor and silver paste technology, which is applied to conductive materials dispersed in non-conductive inorganic materials, can solve problems such as difficult large-scale promotion and use, poor product durability, arcing on the surface and edges, etc., and achieve production The effect of not demanding equipment, high durability, and high voltage resistance
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[0022] Step A: Select conductive silver powder. The silver powder is spherical monodisperse ultrafine silver powder, the particle size distribution is 0.2-2μm, and the tap density is 3.5-5g / cm 3 , 550 ℃ / 0.5hr burning loss is less than 0.1%. Monodispersed ultra-fine silver powder with high tap density can achieve the goal of good solderability.
[0023] Step B: Preparation of organic vehicle. Weigh 78wt% butyl carbitol, 10wt% benzyl alcohol, 9wt% ethylcellulose, and 3wt% surfactant Tego 655. First add butyl carbitol and terpineol into a stainless steel container and mix, then add ethyl cellulose under stirring, heat up to 70-90°C, after the resin is completely dissolved, cool down to 50-60°C and add surface active Agent Tego 655, filtered to obtain a transparent organic vehicle with good printability.
[0024] Step C: preparing lead-free glass powder. Weigh 65 wt% of bismuth oxide, 8 wt% of silicon dioxide, 12 wt% of boron oxide, 10 wt% of zinc oxide and 5 wt% of dicobal...
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