Manufacturing method of NTC (Negative Temperature Coefficient) thermo-sensitive semiconductor ceramic body material

Abstract

The invention belongs to the field of a manufacturing technology of an electronic element / device, and particularly discloses a manufacturing method of an NTC (Negative Temperature Coefficient) thermo-sensitive semiconductor ceramic body material. The manufacturing method comprises the following special steps of: (1) pre-sintering; (2) burdening; (3) ball-milling; (4) drying and (5) grinding and sieving. Compared with the existing method, the method has the advantages that the flow is greatly simplified, the production efficiency is greatly improved, the water and the electricity can be saved, and the manufacturing cost is low. Furthermore, the consistency, the reliability and the precision of the ceramic body powder material can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing electronic components, in particular to a method for manufacturing an NTC heat-sensitive semiconductor ceramic body material. Background technique [0002] NTC refers to a material whose resistance decreases exponentially with temperature rise and has a thermistor phenomenon with a negative temperature coefficient. The material is mainly a semiconductor ceramic made of two or more transition metal oxides such as manganese, copper, silicon, cobalt, iron, nickel, zinc, etc., which are fully mixed, formed, and sintered. Among them, the thermistor is reliable. Performance, hit rate and stability all depend on the performance of the ceramic body material. It can be made into a thermistor with a negative temperature coefficient (NTC), and its resistivity and material constant vary with the ratio of material composition, sintering atmosphere, sintering temperature and structural state. [0003] I...

AI Technical Summary

Problems solved by technology

[0005] 1. There are 9 steps in the production process of the existing technology, and the 7th process is complicated, water and electricity resources are wasted, and the production cost is high;

[0006] 2. Low production efficiency: the existing production method is firstly to prepare manganese, cobalt, iron, nickel, copper and other oxides according to the formula ratio, then add water ball mill and mix them, and then go through two processes of water drying and powdering after mixing. Pre-burn;

[0007] 3. The precision of the product is low: pre-firing is the decisive factor among the materials. The purpose of pre-firing is to reduce the shrinkage rate of the product during sintering, the deformation and the determination of the sintering temperature have a great influence, and the existing technology is to combine several After the raw materials are prepared, pre-fire according to a temperature curve

When the temperature is too high, the low melting point substances in the raw materials will be dissolved, the chemical activity is poor, and the crushed particles and distribution will be uneven, and discontinuous crystal growth will occur during sintering, and the performance will be greatly reduced.

Images