فرمولاسيون ، ساخت و بررسي خواص برقگيرهاي سراميكي

MATERIALS - PROPERTIES RELATIONSSHIP IN CERAMIC VARIOSTORS

Zinc oxide based varistors are electrical ceramics with VDR properties, which can be used in various applications. Different materials are being added to zinc oxide in order to control the I-V behavior of the system. In this research, a based varistor was manufactured via ceramic route. It was sintered from 1150°C to 1400°C. The resultant microstructure and properties were studied and thier relationship was evaluated by measuring the electrical properties as well as the resultant phases and microstructures. The microstructural analysis shows predicted grain and grain boundary phases, in which zinc oxide particles are being surrounded by low temperature grain boundary phases. Most of the B203 containing and other phases are concentated within the boundary layer. According to the designed composition in this research, I-V curve was evaluated and a component was measured which is in good agreement with other research data. The results indicate that the segragation of some elements to grain boundary can affect the electrical behavior of the system.