Fuse and production method therefor
A fuse and a production method therefor. The fuse includes upper and lower insulating layers provided with terminal electrodes, and a fuse element between the upper and lower insulating layers. The fuse further includes a functional layer provided between the fuse element and the insulating layers. The functional layer includes a substrate and an arc extinguishing material uniformly or substantially uniformly distributed in the substrate; the arc extinguishing material includes a sealed cavity; the substrate includes low temperature co-fired ceramic powder, aerosol silicon oxide, silicon oxide, inert resin, phosphoric acid, and phosphate ester polyester; the content of the arc extinguishing material is 1-50 wt %. The fuse overcomes the shortcomings of phenomena such as deformation, bending, and defects occurring to a fuse element caused by the shrinkage mismatch of the fuse element with a buffer layer and an arc extinguishing layer in a sintering process.
1. A fuse, comprising insulating layers and a fuse element,
wherein the insulating layers comprise an upper insulating layer and a lower insulating layer, and the fuse element is arranged between the upper insulating layer and the lower insulating layer; the insulating layers are provided with terminal electrodes electrically connected with the fuse element, wherein the fuse further comprises a functional layer provided between the fuse element and one of the insulating layers; the functional layer comprises substrate and arc extinguishing material uniformly or substantially uniformly distributed in the substrate, wherein the arc extinguishing material comprises a sealed cavity, and
wherein the substrate comprises low temperature co-fired ceramic powder, aerosol silicon oxide, silicon oxide, inert resin, phosphoric acid and phosphate ester polyester.
2. The fuse according to claim 1 , wherein the insulating layers further comprise an interlayer, and the fuse comprises a plurality of the fuse elements and a plurality of the functional layers, and the functional layer is arranged above and/or below each of the fuse element, and the interlayer is arranged between adjacent two of the fuse elements.
3. The fuse according to claim 1 , wherein the arc extinguishing material is hollow glass microsphere, glass body with a plurality of the sealed cavities, or ceramic body with a plurality of the sealed cavities.
4. The fuse according to claim 1 , wherein the sphere diameter D50 of the arc extinguishing material is 10-80 microns.
5. A production method for the fuse according to claim 1 , comprising the following steps:
S1, preparing glass-ceramic slurry with low temperature co-fired ceramic powder and binder;
S2, adding aerosol silicon oxide, silicon oxide, inert resin, phosphoric acid and phosphate ester polyester to the glass-ceramic slurry, and fully stirring and grinding to prepare a pre-slurry of functional layer;
S3, preparing functional layer slurry by adding arc extinguishing material to the pre-slurry of functional layer, wherein the arc extinguishing material is any one of hollow glass microspheres, glass powder mixed with foaming agent, or ceramic powder mixed with foaming agent;
S4, coating a layer of the glass-ceramic slurry to form a slurry layer of glass-ceramic, which is a lower insulating layer slurry;
S5, coating at least one layer of fuse element layer slurry, at least one layer of functional layer slurry and a layer of the glass-ceramic slurry on the lower insulating layer slurry, coating the functional layer slurry above and/or below the fuse element layer slurry, and coating the layer of the glass-ceramic slurry to be an uppermost layer as an upper insulating layer slurry, to form a green body of the fuse;
S6, placing the green body of the fuse in a glue discharging furnace to discharge rubber from the green body of the fuse;
S7, sintering the green body of the fuse;
S8, performing processes of chamfering, mounting terminal electrodes, sintering silver, and electroplating on the green body of the fuse.
6. The production method according to claim 5 , wherein, in Step S5, the at least one layer of functional layer slurry comprises a plurality of sublayers of functional layer slurry that are separated from each other and located in the same plane.
7. The production method according to claim 5 , further comprising a step of cutting the green body of the fuse after Step S5 and before Step S6.
8. The production method according to claim 6 , further comprising a step of cutting the green body of the fuse after Step S5 and before Step S6.
9. The production method according to claim 5 , wherein a solid content in the glass-ceramic slurry is 40-80 wt %.
10. The production method according to claim 6 , wherein a solid content in the glass-ceramic slurry is 40-80 wt %.
11. The production method according to claim 5 , wherein content of the glass-ceramic slurry in the pre-slurry of functional layer is 40-80 wt %.
12. The production method according to claim 6 , wherein content of the glass-ceramic slurry in the pre-slurry of functional layer is 40-80 wt %.
13. The production method according to claim 11 , wherein the total amount of aerosol silicon oxide and silicon oxide in the pre-slurry of functional layer is 0.1-20 wt %.
14. The production method according to claim 11 , wherein content of the low temperature co-fired ceramic powder in the pre-slurry of functional layer is 0-20 wt %.
15. The fuse according to claim 1 , wherein two of the functional layers are arranged above and below the fuse element, respectively.
16. The fuse according to claim 1 , wherein the functional layer comprises a plurality of sub-functional layers separated from each other in a same plane.
17. The fuse according to claim 1 , wherein content of the arc extinguishing material of the functional layer is 1-50 wt %.
18. The production method according to claim 5 , comprising, in Step S5, coating a plurality of layers of the functional layer slurry, and coating the slurry layer of glass-ceramic between two adjacent layers of the fuse element layer slurry.
19. The production method according to claim 5 , wherein content of the arc extinguishing material in Step S3 is 1-50 wt %.