Sintering device of ultra-miniature ring varistor

Abstract

The invention relates to a sintering device for super-miniature annular voltage dependent resistors. The sintering device for the super-miniature annular voltage dependent resistors comprises a bottom shell, a cover body and a plurality of sintering bars. The bottom shell comprises a bottom wall and a plurality of side walls surrounding the bottom wall. The bottom shell is provided with the open end opposite to the bottom wall. The side walls are provided with a plurality of air holes. The cover body detachably covers the open end. The shell and the cover body together form a containing cavity. The sintering bars are contained in the containing cavity, horizontally hung and arranged between the two opposite side walls of the bottom shell. The sintering bars are used for being arranged in through holes in the middle of blank rings of the multiple super-miniature annular voltage dependent resistors in a penetrating mode so that the multiple blank rings can be hung on the sintering bars at intervals. According to the sintering device for the super-miniature annular voltage dependent resistors, the blank rings are not prone to deforming in the sintering process, and the requirements for the mechanical strength and the electrical property of the super-miniature annular voltage dependent resistors are met.

Description

technical field [0001] The invention relates to semiconductor manufacturing technology, in particular to an ultraminiature annular varistor sintering device. Background technique [0002] The ring varistor is a sensitive element with nonlinear volt-ampere characteristics. Under normal voltage conditions, this is equivalent to a small capacitor, and when the circuit is overvoltage, its resistance drops sharply and it is turned on quickly, its operating current increases by several orders of magnitude, and the resistance value of the piezoresistor is externally applied. The voltage change thus effectively protects other components in the parallel circuit from being damaged due to overvoltage and suppresses the peak value of the loop voltage within a certain range. [0003] At present, we call ring varistors with an outer diameter of less than 2.4mm "ultraminiature ring varistors". This is a ring-shaped varistor with the smallest size at present, and its size is (outer diamet...

AI Technical Summary

Problems solved by technology

When the material is sintered with hydrogen, a reduction reaction will occur to form a metal substance. The reaction is gradually carried out from the surface of the blank ring to the center of the blank ring; Fully exposed to the hydrogen in the furnace body, the synchronous reduction reaction will cause differences in the metallization degree of each blank ring and different parts of the same blank ring, resulting in poor semiconducting of the blank ring of the ultra-miniature ring varistor into electronic ceramics. Deformation occurs, so that the mechanical strength and electrical properties cannot meet the requirements

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