Arc extinguishing powder with multi-layer composite structure and preparation method
A multi-layer composite and arc powder technology, which is applied in the manufacture of fuses, electrical components, circuits, etc., can solve the problems of small range of arc extinguishing capability, use safety restrictions, easy aging, etc., achieve good fusing characteristics, and ensure the safety of machines and equipment , the effect of prolonging the service life
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preparation example Construction
[0025] And the preparation method of the above-mentioned arc extinguishing powder with "core-shell" multilayer composite structure comprises the following steps:
[0026] 1) Material weighing: Weigh various raw materials of the required quality according to the formula ratio for use;
[0027] 2) Core layer preparation: Pour quartz sand or various gas-generating materials that can be used as the core layer into a mortar, and add a small amount of binder to grind and mix evenly to ensure a good bonding effect on the surface of the core layer material.
[0028] 3) Preparation of multi-layer shell: adding fumed silica powder or gas-generating material and binder as the shell layer to the core material obtained in step 2) in batches, and continuously grinding and granulating, finally obtaining Layer composite structure arc extinguishing powder. Especially, in step 3), in order to ensure that the shell layer has good thickness uniformity, it is necessary to divide the fumed silica ...
Embodiment 1
[0030] Embodiment 1: Weigh 50g (80wt%) of quartz sand, 10g (16wt%) of fumed silica powder, and 2.5g of melamine formaldehyde resin solution (as a binding agent, 4wt%)).
[0031] Pour the quartz sand into a mortar, drop 1g of melamine formaldehyde resin and grind evenly, then add 4g of fumed silica powder, continue grinding until the surface of the powder is evenly dry, then add 1.5g of melamine formaldehyde resin, grind evenly, and finally The remaining 6g of fumed silica powder was added for grinding and granulation to obtain spherical powder with dry surface and good fluidity. The obtained powder is sorted through 150-mesh and 100-mesh sieves to obtain the required arc extinguishing powder.
[0032] Take the traditional quartz sand as the arc extinguishing powder and the arc extinguishing powder modified by the process of this embodiment to compare the fusing characteristics and breaking characteristics of the 2.0A product as an example. The same metal melt assembly is used ...
Embodiment 2
[0035] Weigh 32g (61.54wt%) of quartz sand, 15g (28.85wt%) of fumed silica powder, and 5g of melamine formaldehyde resin (as a binder, 9.6wt%).
[0036] Pour the quartz sand into the mortar, drop in 2g of melamine formaldehyde resin and grind evenly to obtain spherical particles with good fluidity, then add 6g of fumed silica powder, continue grinding until the surface of the powder is dry and uniform, then add 3g of melamine The formaldehyde resin was ground evenly, and finally the remaining 9g fumed silica powder was added for grinding and granulation to obtain a spherical powder with a dry surface and good fluidity. The obtained powder is sorted through 200-mesh and 150-mesh sieves to obtain the required arc extinguishing powder.
[0037]Take the traditional quartz sand as the arc extinguishing powder and the arc extinguishing powder modified by the process of this embodiment to compare the fusing and breaking characteristics of the 0.5A product as an example. The same meta...
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Abstract
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