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Method for improving reduction resistance of PTC (Positive Temperature Coefficient) thermosensitive element

A heat-sensitive component and performance technology, applied in the direction of electrical components, resistors with positive temperature coefficients, resistance manufacturing, etc., can solve the problems of high product cost, low production efficiency, and difficult preparation, so as to reduce the preparation cost and improve Manufacturing efficiency and the effect of simplifying the preparation process

Pending Publication Date: 2022-05-13
JIANGSU NEW LINZHI ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the aforementioned CN112802674B requires special development and research of the cladding materials used, i.e. inorganic glass and organic coating, so the preparation is relatively difficult, and it will lead to high product costs and form a bottleneck factor for a wide-ranging and large-volume market.
The aforementioned CN113265636A is low in production efficiency and needs to rely on expensive equipment and can only be suitable for small-sized products, so there are relatively large constraints on industrialized high-efficiency mass production

Method used

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  • Method for improving reduction resistance of PTC (Positive Temperature Coefficient) thermosensitive element
  • Method for improving reduction resistance of PTC (Positive Temperature Coefficient) thermosensitive element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The surface of the PTC thermosensitive element based on lead barium titanate is covered with an inorganic protective layer for blocking reducing harmful gases from entering the interior of the porcelain body through surface defects or grain boundaries (also known as "grain boundaries"). The surface defects of the porcelain body are not limited to such as microcracks and / or micropores. The inorganic protective layer is a glass film layer, and the glass film layer is a slurry prepared from glass. The specific embodiment is: glass powder , Adhesive, curing agent and diluent are formulated according to the mass percentage of 82%: 12%: 2%: 4% and mixed evenly, coated by spraying or screen printing. As a cleaning agent, the surface of the PTC heat-sensitive element that is cleaned and dried after the surface cleaning treatment is then subjected to high-temperature infiltration at a temperature of 550°C. Raise the temperature to the softening point of the glass, keep it warm a...

Embodiment 2

[0022] The surface of the PTC thermosensitive element based on lead barium titanate is covered with an inorganic protective layer for blocking reducing harmful gases from entering the interior of the porcelain body through surface defects or grain boundaries (also known as "grain boundaries"). The surface defects of the ceramic body are not limited to such as microcracks and / or micropores, and the inorganic protection layer is a metal oxide film layer, which sputters the oxide of the metal oxide target material by sputtering It is sprayed and bonded to the surface of the PTC thermal element that has been cleaned with deionized water as a cleaning agent and dried after the surface cleaning, and then heat-treated at a temperature of 450 ° C for 45 minutes to obtain a surface coated with a thickness It is a PTC thermosensitive element with a 1 micron inorganic protective layer that is served by a metal oxide film layer and has a good isolation and protection effect that effectivel...

Embodiment 3

[0024] Only change spraying or printing to dipping, and change the softening temperature of glass powder to 800°C, the infiltration temperature to 800°C, change the holding time to 10min, and change the thickness of the glass film layer to 5 microns, and the rest are the same Description of Example 1.

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Abstract

The invention discloses a method for improving the reduction resistance of a PTC thermosensitive element, and belongs to the technical field of preparation of electronic components. The surface of the PTC thermosensitive element based on barium lead titanate is coated with an inorganic matter protective layer, an organic matter protective layer or an organic-inorganic compound protective layer formed by mixing inorganic matter and organic matter, wherein the inorganic matter protective layer and the organic matter protective layer are used for preventing reductive harmful gas from entering a ceramic body through surface defects or grain boundaries of the ceramic body, and the inorganic matter protective layer and the organic matter protective layer are used for preventing reductive harmful gas from entering the ceramic body. The PTC thermosensitive element has the advantages that the inorganic matter protection layer, the organic matter protection layer or the organic-inorganic compound protection layer formed by mixing the inorganic matter and the organic matter can be coated on the surface of the PTC thermosensitive element taking the barium lead titanate as the base to form the isolation protection layer used for preventing reducing harmful gas from entering the ceramic body through surface defects or grain boundaries of the ceramic body; therefore, the restriction that inorganic glass or an organic coating which is self-researched and developed and is obtained through a complex and harsh preparation process is used as a coating material is eliminated, the preparation process is simplified, the preparation cost is reduced, and the manufacturing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic component preparation, and in particular relates to a method for improving the anti-reduction performance of a PTC thermosensitive element. Background technique [0002] The PTC mentioned above is the "Positive Temperature Coefficient", which is the abbreviation of "Positive Temperature Coefficient" in English. The PTC thermal element mainly refers to but is not absolutely limited to: 3 ] Based positive temperature coefficient ceramic thermal element. PTC thermal element is a polycrystalline ceramic element prepared by high-temperature sintering. Its PTC thermal effect comes from the grain boundary, and its performance is greatly affected by the external environment. For example, when the PTC thermal element works in a harsh environment such as a reducing atmosphere for a long time, it is easy to cause the performance of the PTC to decline or even disappear. Typical examples used in the afore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C17/00
CPCH01C7/021H01C7/022H01C17/00
Inventor 傅邱云何正安周东祥
Owner JIANGSU NEW LINZHI ELECTRONIC TECH CO LTD