Lead-free composite glass powder for side insulation of ZnO resistor disc, preparation method and glass glaze

Abstract

The invention provides lead-free composite glass powder for side insulation of a ZnO resistor disc, a preparation method of the lead-free composite glass powder and glass glaze, and the lead-free composite glass powder comprises the following components in parts by weight: 60-80% of Bi2O3, 5-14% of ZnO, 10-25% of B2O3, 2-5% of Al2O3, 0.5-3% of CaO, 0.1-0.6% of Fe2O3, 1-5% of CuO, 1-3% of MnO2 and 0.1-1% of Sb2O3. Therefore, the insulating paint has the advantages of being free of harmful elements such as vanadium and lead and high in insulating property.

Description

technical field [0001] The invention relates to the technical field of ZnO non-linear metal oxide varistors for lightning arresters in power systems, in particular to a lead-free composite glass powder used for side insulation of ZnO resistors, a preparation method and glass glaze. Background technique [0002] Varistors have a good performance in suppressing voltage surges and overvoltage protection, especially play a very important role in ensuring the safety, stability and normal operation of electronic equipment and power equipment, and because of their convenient production and low cost For this reason, varistors have been widely used in many fields such as national defense and military, aerospace, electric power (AC-DC power transmission and distribution) electronics, communication and transportation, industrial protection and household appliances. [0003] Since Panasonic Corporation of Japan first successfully developed a varistor with ZnO as the main body and modifi...

AI Technical Summary

Problems solved by technology

However, bismuth salt glass generally has low strength. As the outer protective layer on the side of the ZnO resistor, it is easy to bump and cause cracks during the subsequent processing and handling of the ZnO resistor.

The use of devitrification-type bismuth salt glass will make the glass components more complex, and the heat treatment temperature needs to be strictly controlled to control the degree of devitrification and the type of crystalline phase, which makes mass production more difficult

[0006] Chinese patent CN101857370A discloses a lead-free bismuth salt glass powder, the raw materials are composed of: Bi 2 o 3 65-85%, B 2 o 3 1~30%, ZnO 1~20%, Al 2 o 3 1~10%, MgO 1~5%, V 2 o 5 1~5%, Li 2 O is 1~5%, WO 3 1~5%, P 2 o 5 1 to 3%, SrO is 1 to 3%; although the formula is based on bismuth salt glass, the formula still contains vanadium, and the highly toxic V 2 o 5 The introduction of, secondly, there is also phosphorus element in the formula, and with P 2 o 5 Introduced, P 2 o 5 Raw materials are prone to deliquescence, which is difficult to accurately control in large quantities, which is not conducive to industrial production; in addition, the glass layer obtained by the final sintering of this patent is non-crystalline, and there is a risk of cracking due to bumping

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