Low-temperature co-fired ceramic stacking protective element and manufacturing method thereof

Abstract

The invention relates to a low-temperature co-fired ceramic (LTCC) stacking protective element and a manufacturing method thereof. A ceramic substrate of the element is provided with a stamping groove, and the stamping groove is filled with LTCC porous ceramics slurry or pore-forming agent slurry. A melt layer is stacked on the ceramic substrate which is filled with the LTCC porous ceramics slurry or the pore-forming agent slurry, making an electrode pattern locate right above the stamping groove which is filled with the LTCC porous ceramics slurry or the pore-forming agent slurry. Other ceramic substrate is stacked on the ceramic substrate which has the melt layer. Stamping groove portions of the two ceramic substrates are in the same vertical planes, so that the melt layer is disposed between the stamping groove portions which are filled with the LTCC porous ceramics slurry or the pore-forming agent slurry. Using a porous filling material with an extremely low thermal coefficient and a large specific surface area can disperse an impact effect on a product, and the impact effect is caused by high-pressure heat flow generated when a fuse link moves.

Description

technical field [0001] The invention relates to an overcurrent protection element and a manufacturing method thereof, in particular to a structure and a manufacturing method of a porous low-temperature co-fired ceramic overcurrent protection element produced by an in-situ solidification and stacking process. Background technique [0002] High-voltage current-limiting fuses used in electrical equipment such as power switches and transformers usually need to include an arc extinguishing device (with arc extinguishing material or special structure) to help extinguish the arc generated when the fuse element operates under a fault current state , so as to avoid the heat generated by excessive current to melt and vaporize the fuse element, and form a high-voltage heat flow inside the fuse, resulting in unsafe fusing problems such as product burst. Panasonic International Patent Application No. PCT / JP2007 / 055083 (Chinese Patent Application No. 200780009165.3) proposed the method of...

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Problems solved by technology

However, this structure has obvious disadvantages: the micro-cavities are prone to deformation during product stacking and sintering, making it difficult to control the size of the micro-cavities, and the size of the micro-cavities is also limited; The effect of the downward depression makes it difficult to control the length of the fuse link, so that the consistency of the fusing characteristics of the final product will become poor

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