Use of titanium oxide (TiO2), oxide of niobium (Nb2O5) and chromium oxide (Cr2O3) for the production of varistor systems

摘要

Use of titanium oxide (TiO ~ 2 ~), the oxide of niobium (Nb2O5) and oxide of chromium (Cr ~ 2 ~ ~ 3 ~) for the production of systems varistors. It is grounded in concepts and practices that motivate the knowledge inherent in the following areas of scientific knowledge, materials engineering, electrical engineering, physics and chemistry.Voltage peaks are fairly common events that may produce a temporary or permanent faults in electrical circuits. This protection in low voltage levels has been carried out by means of electronic components such as diodes Zeners, thyristors and sets of resistors and capacitors.Zeners and thyristors are components that have low energy absorption capability and mechanism of protective action sustained by only one barrier. The varistors are components made of polycrystalline ceramic materials, besides having a great capacity of energy absorption, protection mechanism, produced by a number of barriers along the material.A single varistor can replace a set of resistors and capacitors, reducing the occupied space on the circuit board and producing protection with better efficiency. However the current commercial varistors produced by the conventional method of ceramic processing, due to the intrinsic characteristics of their microstructures, not able to exert protection in low voltage.Studies on the use of TiO2 as a main substance for the production of varistors have shown its ability, when he added other oxides and processing by the conventional method of ceramic processing, acting as a protector in low voltage. The present invention has the merit of having adequate u00e1xidos added in adequate quantities.