A composite structure thick film oil level sensor resistance sheet and its preparation method
An oil level sensor and composite structure technology, applied in thick film resistors, resistor manufacturing, resistors and other directions, can solve the long-term work of oil level sensors, product quality hidden dangers, low cost performance of thick film oil level sensor products, and increased manufacturing costs and other problems, to achieve the effect of reducing the hidden danger of product quality, ensuring long-term reliability and increasing the cost of construction
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Embodiment 1
[0041] see figure 1As shown, a composite structure thick-film oil level sensor resistor sheet includes a substrate 1 , a thick-film palladium-silver conductor paste layer 2 , a ruthenium-based resistor paste layer 3 and a pad 4 .
[0042] The substrate 1 is made of a 96% alumina substrate.
[0043] The thick-film palladium-silver conductor paste layer 2 is composed of a bottom thick-film silver conductor paste layer and an upper thick-film palladium-silver conductor paste layer; the bottom thick-film silver conductor paste layer is screen printed on the middle and lower part of the substrate 1 , the upper thick-film palladium-silver conductor paste layer is screen-printed on the bottom thick-film silver conductor paste layer, and the thick-film palladium-silver conductor paste layer 2 is separated into upper and lower parts. The film palladium-silver conductor paste layer 2 is arc-shaped and has a plurality of first equal-spaced thin lines printed on the inner edge of the arc...
Embodiment 2
[0047] A preparation method of a composite structure thick film oil level sensor resistor sheet, the method comprises the following steps:
[0048] Step 1. Clean the substrate 1 and dry it for the first time, and prepare the bottom thick film silver conductor paste and the upper thick film palladium silver conductor paste of the thick film palladium-silver conductor paste layer 2; the drying The temperature is 120℃-130℃, and the drying time is 8min-12min. The content of silver powder 6 in the upper thick-film palladium-silver conductor paste accounts for 25% of the total silver powder in the thick-film palladium-silver conductor paste layer 2;
[0049] During specific implementation, the substrate 1 is made of a 96% alumina substrate;
[0050] Step 2. Use screen printing to print the bottom layer thick film silver conductor paste on the substrate 1. The viscosity of the bottom layer thick film silver conductor paste is 300kcps, the solid content accounts for 45% of the bottom...
Embodiment 3
[0061] Step 1. Clean the substrate 1 and dry it for the first time, and prepare the bottom thick film silver conductor paste and the upper thick film palladium silver conductor paste of the thick film palladium-silver conductor paste layer 2; the drying The temperature is 120℃-130℃, and the drying time is 8min-12min. The content of silver powder 6 in the upper thick-film palladium-silver conductor paste accounts for 35% of the total silver powder in the thick-film palladium-silver conductor paste layer 2;
[0062] Step 2. Use screen printing to print the bottom layer thick film silver conductor paste on the substrate 1, the viscosity of the bottom layer thick film silver conductor paste is 280kcps, the solid content accounts for 35% of the bottom layer conductor paste, and the organic carrier The proportion of the bottom conductor paste is 65%, the conductive phase in the solid content accounts for 90% of the solid content, the binder phase 5 accounts for 10% of the solid cont...
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