Preparation method for improving voltage resistance of PTC ceramic
A technology of withstand voltage and high capacity, which is applied in the field of electronic materials and ceramic material preparation, can solve the problems of lower room temperature resistivity of PTC heating elements, deterioration of PTC performance, deterioration of PTC electrical performance, etc., to achieve easy industrial implementation and improve withstand voltage Ability, easy-to-control effects
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[0018] The embodiment of the present application provides a preparation method for improving the withstand voltage capability of PTC ceramics, including the following process steps:
[0019] 1) Coating a layer of organic silicon aqueous solution on the outer peripheral side of the PTC thermosensitive ceramic element by dip coating or screen printing;
[0020] 2) heat-treating the coated PTC thermosensitive ceramic element to form a protective film on the peripheral side of the PTC thermosensitive ceramic element.
[0021] Wherein, the organosilicon aqueous solution described in step 1) includes:
[0022]
[0023]
[0024] Preferably, the particle size in the nano silicon aqueous solution is ≤50nm.
[0025] In the embodiment of the present invention, the pH value of the organosilicon-based aqueous solution is 6.0-6.8.
[0026] Preferably, the heat treatment temperature in step 2) is 200-300° C., and the heat treatment time at this temperature is longer than 10 minutes. ...
specific example 1
[0029] The specific example of the present invention discloses a preparation method for improving the withstand voltage capability of PTC ceramics through surface coating, which includes the following process steps:
[0030] 1) Apply a layer of organic silicon aqueous solution on the outer peripheral side of the PTC heat-sensitive ceramic element by dip coating; A good silicone solution, the solution is just submerged in the thickness of the sponge; then place the sides of the neatly arranged PTC ceramic sheets on the sponge for 1 second, and dip the surroundings sequentially according to the above method); screen printing can also be used, Preferably, a 260-mesh screen is used to arrange the PTC ceramic sheets neatly, and then print the four sides on the outer peripheral side in sequence;
[0031] 2) Heat-treat the coated PTC element at 250° C. for 30 minutes in the atmosphere to form a uniform and dense protective film on the side of the ceramic with a film thickness of abou...
specific example 2
[0038] The specific example of the present invention discloses a preparation method for improving the withstand voltage capability of PTC ceramics through surface coating, which includes the following process steps:
[0039] 1) Dip coating on the outer peripheral side of the PTC heat-sensitive ceramic element. The dip coating operation is screen printing, using a 260-mesh screen, arranging the PTC ceramic sheets in order, and printing 4 sides in sequence to coat a layer of organic Silicone aqueous solution; you can also place a sponge with a thickness of 2mm in a flat-bottomed stainless steel basin, pour in the prepared silicone solution, the solution is just below the thickness of the sponge, and then place the sides of the neatly arranged PTC ceramic sheets on the sponge For 1 second, the four sides are dipped in turn according to the above method;
[0040] 2) Heat-treat the coated PTC element at 270° C. for 30 minutes in the atmosphere to form a uniform and dense protective...
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Abstract
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