Spraying process of aluminum electrodes of pressure-sensitive resistant discs
A varistor, aluminum electrode technology, applied in the direction of varistor, overvoltage protection resistor, resistor with lead-out terminal, etc., can solve problems such as product scrap, improve energy absorption, improve current capacity, solve aluminum Effect of Electrode Al-Metal Phenomenon
Inactive Publication Date: 2012-12-12
NANYANG JINNIU ELECTRIC
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[0010] The varistor sheet aluminum electrode spraying process of the present invention is sprayed according to the following steps:
[0011] 1. Paint: Arrange the piezoresistors neatly, place them on the coating machine, coat with a layer of insulating varnish, and heat-cure in an oven at 180-220°C / 2h;
[0012] 2. Spraying aluminum electrodes: put the piezoresistors coated with insulating paint and heat-cured directly on the aluminum spraying machine to directly spray aluminum electrodes;
[0013] 3. Heat treatment: Put the varistor sheet sprayed with aluminum electrodes into the kiln, conduct heat treatment at 450-500°C, and bake off the insulating varnish around the varistor sheet.
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The invention discloses a spraying process of aluminum electrodes of pressure-sensitive resistant discs. The process comprises the following steps: 1. paint coating: the pressure-sensitive resistant discs are arrayed in order, placed on a coating machine, an insulation layer is coated, and the pressure-sensitive resistant discs are subjected to thermocuring in a toaster; 2. aluminum electrodes spraying: the pressure-sensitive resistant discs after insulation layer coating and thermocuring are placed on an aluminum spraying machine directly and are directly subjected to aluminum electrodes spraying; and 3. thermal treatment: the pressure-sensitive resistant discs after aluminum spraying are placed in a kiln furnace for thermal treatment, and insulation paint at the periphery of each pressure-sensitive resistant disc is roasted away. The process has the advantages that the method is convenient to operate, a step of covering a rubber sleeve with low efficiency in the traditional process is saved, and the production efficiency is improved; and simultaneously the meta-aluminum phenomenon of the aluminum electrodes is solved, the increasing cover area of the aluminum electrodes enables the energy absorption of the pressure-sensitive resistant discs to be improved greatly, thus the through-current capability of the pressure-sensitive resistant discs is improved.
Description
technical field [0001] The invention belongs to the technical field of piezoresistor production, in particular to a spraying process of aluminum electrodes of piezoresistors. Background technique [0002] The core component of the ZnO surge arrester --- the core of the varistor chip forms a conductive path by connecting the plane electrodes at both ends. Since the core will bear a large electrical load during the operation of the arrester, all measures are taken to ensure its electrical passage. The electrodes not only have good electrical conductivity and arc resistance, but also have good adhesion to the surface of the ceramic body. Whether the combination degree of the electrode and the ceramic body is sufficient or not will directly affect the flow capacity of the resistor sheet. The traditional process of spraying aluminum electrodes is to put rubber rings on both ends of the piezoresistor before spraying. After the rubber ring is used, the aluminum powder accumulated...
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IPC IPC(8): H01C17/28H01C7/12
Inventor 傅鹏立李越姚婴初侯永利赵旭
Owner NANYANG JINNIU ELECTRIC