Manufacturing method for ceramic heating element

Abstract

The invention discloses a manufacturing method for a ceramic heating element. According to the manufacturing method, the ceramic heating element adds iron powder into tungsten paste, and the stabilityof the tungsten paste is neutralized and the solidity of later brazing is improved; and the addition of ruthenium oxide not only improves the conductivity of welding electrodes, but also ensures thestability of specific resistance in printed circuits. The manufacturing method uses the combination of high pressure and hot pressure when two layers of green layers are pressed, and the problem of poor binding force of a film layer after sintering is solved; and in the process of sintering, ammonia is filled in, nitrogen and hydrogen are obtained by pyrolysis of ammonia in a tunnel kiln by usinghigh temperature, sintering is performed after a reducing gas atmosphere is formed, oxidation is prevented, the cost of sintering is reduced, hydrogen gas gushing from both ends of the tunnel kiln isignited to form a protective gas film, and water obtained after hydrogen ignition can not only effectively cool sintered ceramic sheets, but also alleviate the problem of low strength of unsintered green sheet in the sintering process.

Description

technical field [0001] The invention relates to the technical field of heating ceramics, in particular to a method for manufacturing a ceramic heating element. Background technique [0002] Ceramic heating substrate is a new generation of upgraded heating element products developed in recent years. Because of its environmental protection, high reliability, long life and other characteristics, it is replacing the PTC heating elements commonly used in the past containing lead components. It is widely used at home and abroad. Market prospects. Therefore, research on the production technology of high-temperature alumina ceramic heating substrate products has been paid more and more attention by people. [0003] At present, the more common production process is to pass ceramic raw materials through steps such as ball milling, pressing, sintering, metallization, secondary sintering, and nickel plating. Among them, hot die-casting is often used for pressing, and the formed blank i...

AI Technical Summary

Problems solved by technology

[0003] At present, the relatively common production process is to pass ceramic raw materials through steps such as ball milling, pressing, sintering, metallization, secondary sintering, and nickel plating. Among them, hot die-casting is often used for pressing, and the formed blank is easily deformed and the yield is low.

Moreover, ceramics often encounter the following problems in the metallization process: low metallization strength, poor film adhesion, easy oxidation, high sintering cost, etc., and the internal printed circuit is prone to large resistivity fluctuations, unstable electrode welding, Electrode welding is difficult and other problems

These not only lead to a decrease in yield, but also affect product quality. Therefore, continuous research to improve the technological level of ceramic heating elements is very important for improving product quality and promoting the development of ceramic heating elements.