(1) raw materials to be selected
Factors affecting the quality of high-voltage ceramic capacitors, in addition to the composition of the porcelain material, optimize the process of manufacturing, strict process conditions is very important. Therefore, the raw materials should be considered both the cost and pay attention to the purity, the choice of industrial pure raw materials, must pay attention to the applicability of raw materials.
(2) the preparation of molten blocks
The quality of the preparation of the melt block has a great influence on the ball mill fineness and firing of the porcelain, such as low synthesis temperature of the melt block, the synthesis is not sufficient. The film capacitor manufacturer is not good for the subsequent process. If the residual Ca2+ in the synthesized material will hinder the rolling film process: if the synthesis temperature is high, making the frit too hard will affect the ball milling efficiency: the introduction of impurities in the grinding medium will reduce the powder activity and lead to higher firing temperature of porcelain parts.
(3) molding process
Forming to prevent uneven pressure in the direction of thickness, too many closed pores of the blank, if there are large pores or layer cracks generated, will affect the electrical strength of the porcelain body.
(4) firing process
Should be strictly controlled firing system, take the excellent performance of temperature control equipment and good thermal conductivity of the kiln equipment.
(5) package sealing
The choice of sealing material, the control of sealing process and the clean treatment of the surface of the porcelain parts have great influence on the characteristics of the capacitor. Ok this, must choose good moisture resistance, and porcelain body surface closely combined, high electrical strength of the package sealing material. At present, most of the choice of epoxy resin, a few products also have the choice of phenolic resin for sealing. There are also taken first insulating paint coating, and then the phenolic resin encapsulation method, which has some significance to reduce costs. Most of the large-scale production lines use powder encapsulation technology.
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