PTC ceramic sintering sagger and using method thereof

Abstract

The invention belongs to the technical field of electronic components, and particularly provides a PTC ceramic sintering sagger and a using method thereof. A graphite strip playing a supporting role between an upper cover plate of the sintering sagger and a sagger body is utilized, so that the air permeability of the sintering sagger in the glue discharging stage is guaranteed, and organic matter added in the granulation process can be fully discharged after thermal decomposition; in the using process, by means of segmented heating, it is guaranteed that organic additives are discharged in the glue discharging stage, then the temperature is increased, the graphite strip is gradually oxidized and consumed, the upper cover plate falls to be sealed with the sagger body, after the upper cover plate enters a sintering high-temperature area, the sealed sintering sagger guarantees the consistency of the internal temperature, a sintering block body is subjected to heat preservation at a low temperature after undergoing a high sintering temperature, rapid movement of a crystal boundary is inhibited, the sintering block body with fine and uniform crystal grains can be obtained, and finally PTC ceramic which is compact in structure, uniform in crystal grain size, uniform in resistance value distribution and low in edge color abnormity rate is obtained.

Description

technical field [0001] The invention belongs to the technical field of electronic components, and in particular relates to a PTC ceramic sintered sagger and a using method thereof. Background technique [0002] Positive temperature coefficient ceramics, referred to as PTC ceramics, are widely used in various fields, and a certain proportion of PVA will be added in the PTC powder granulation process to increase the fluidity of the powder during the molding process to ensure the stability of the formed blank. strength. In order to prevent the added organic matter from affecting product performance, debinding is generally carried out before or during sintering, while the existing saggers are usually non-sealed to ensure that the organic matter can be fully discharged during the debinding process. Due to uneven heat in the sintering process, it will cause occasional abnormal color of the edge of the ceramic sheet, and the sintering resistance of different parts will be scattere...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of non-uniform sintering heat, abnormal color of the edges of ceramic sheets, and scattered sintering resistance values ​​at different parts in the prior art.

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