An overcurrent protection element, its preparation method, and an overcurrent protection circuit
A technology of overcurrent protection components and metal electrodes, applied in circuits, electrical components, emergency protection devices, etc., can solve the problems of difficult to meet the development trend of miniaturization and integration of electronic components, occupying large volumes, etc., and achieve easy The effect of preparation, high line resolution, and simple process
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[0026] The preparation method of the overcurrent protection element of this specific embodiment comprises the following steps:
[0027] S1, prepare a polymer resin as a matrix, prepare metal powder, the microstructure of the metal powder is three-dimensional radial structure particles; uniformly disperse the metal powder in the matrix to prepare a composite material.
[0028] In this step, metal powder whose microstructure is particles of a three-dimensional radial structure is used. Centered on a point in the direction of three-dimensional space, the radial structure radiating to the surrounding includes tertiary dendrite structure, secondary dendrite structure, cauliflower shape, strawberry shape, pompom shape, sponge shape, sea urchin shape, starfish shape, flower shape One or more of these structures. Metal powder can be one or more mixtures of silver, copper, tin, gold, platinum, palladium, aluminum, titanium, chromium, iron, cobalt, nickel, zinc, molybdenum, ruthenium, ...
Embodiment 1
[0039] Micro-nano metal silver particles with a tertiary dendrite structure are used as fillers, and the morphology of the metal particles is as follows: figure 1 As shown, it has a three-dimensional radial structure. Based on the weight of the composite material to be prepared, 15% by weight of silver powder was dispersed in the polyester resin matrix to prepare a composite material for printable overcurrent protection components (such as fuse fuses). The silver paste made of the composite material is printed on the printed circuit board between copper electrodes with an electrode spacing of 200 microns by screen printing method. The printed component has a width of 50 microns and a thickness of 12 microns. The schematic diagram of the structure is as follows: figure 2 shown.
[0040] The printed element was heat-treated at 110° C. for 30 minutes to completely cure the resin matrix to obtain an overcurrent protection element with a rated current of 150 mA. The SEM image of...
Embodiment 2
[0042] Micronano metal silver-copper alloy particles with a starfish structure are used as fillers, and the morphology of the alloy metal particles is as follows: Figure 5 As shown, it has a three-dimensional radial structure. Based on the weight of the composite material to be prepared, 40 wt% of the metal particle filler was dispersed in the epoxy resin matrix to prepare a composite material for printable overcurrent protection components (such as fuse fuses). The slurry made of the composite material was printed on the epoxy resin glass fiber board between copper electrodes with an electrode spacing of 200 microns by screen printing, and the printed element had a width of 80 microns and a thickness of 10 microns.
[0043] The printed element was heat-treated at 130° C. for 20 minutes to completely cure the resin matrix to obtain an overcurrent protection element with a rated current of 100 mA. Apply an overload current to both ends of the overcurrent protection element. A...
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