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Positive temperature coefficient ceramic thermistor element with strong reducing atmosphere resistance, and preparation method thereof

A thermistor element and positive temperature coefficient technology, which is applied to resistors with positive temperature coefficients, electrical components, resistor parts, etc., can solve the problems of damaging the macroscopic electrical properties of the components and losing the self-temperature control function.

Active Publication Date: 2021-05-14
JIANGSU NEW LINZHI ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main reason why the PTC thermal element is easily affected by the harsh environment is that it is a polycrystalline ceramic material. There are not only grain boundaries, but also a large number of micropores. Various bad atmospheres can enter the grain boundaries through these micropores, thereby damaging The macroscopic electrical properties of components, such as the loss of self-temperature control function due to redox

Method used

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  • Positive temperature coefficient ceramic thermistor element with strong reducing atmosphere resistance, and preparation method thereof
  • Positive temperature coefficient ceramic thermistor element with strong reducing atmosphere resistance, and preparation method thereof
  • Positive temperature coefficient ceramic thermistor element with strong reducing atmosphere resistance, and preparation method thereof

Examples

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Embodiment 1

[0027] See figure 1 , figure 1 Shown is a positive temperature coefficient ceramic thermistor element with strong resistance to reducing atmosphere, including lead-barium titanate-based and sintered specifications of 24×15×2.4mm (not limited by the exemplified size ) heat-sensitive ceramic tile 1 and metal ohmic electrodes 2 positioned at both sides of the heat-sensitive ceramic tile 1, as the technical points of the technical solution provided by the present invention: it also includes a micropore channel barrier layer 3, in this embodiment , the microporous channel blocking layer 3 is a glass sealing layer, and the glass sealing layer is integrally coated on the outer surface of the aforementioned heat-sensitive ceramic tile 1 with a thickness of 5 μm. The aforementioned metal ohmic electrode 2 is preferably, but not absolutely limited to, aluminum , copper, silver-zinc alloy or base metal as the metal ohmic electrode, and the metal ohmic electrode 2 can be combined with th...

Embodiment 2

[0033] See figure 1 , figure 1 Shown is a positive temperature coefficient ceramic thermistor element with strong resistance to reducing atmosphere, including lead-barium titanate-based and sintered specifications of 24×15×2.4mm (not limited by the exemplified size ) heat-sensitive ceramic tile 1 and metal ohmic electrodes 2 positioned at both sides of the heat-sensitive ceramic tile 1, as the technical points of the technical solution provided by the present invention: it also includes a micropore channel barrier layer 3, in this embodiment , the microporous channel blocking layer 3 is a glass sealing layer, and the glass sealing layer is integrally coated on the outer surface of the aforementioned heat-sensitive ceramic tile 1 with a thickness of 2 μm. The aforementioned metal ohmic electrode 2 is preferably, but not absolutely limited to, aluminum , copper, silver-zinc alloy or base metal as the metal ohmic electrode, and the metal ohmic electrode 2 can be combined with th...

Embodiment 3

[0039] See figure 1 , figure 1 Shown is a positive temperature coefficient ceramic thermistor element with strong resistance to reducing atmosphere, including lead-barium titanate-based and sintered specifications of 24×15×2.4mm (not limited by the exemplified size ) heat-sensitive ceramic tile 1 and metal ohmic electrodes 2 positioned at both sides of the heat-sensitive ceramic tile 1, as the technical points of the technical solution provided by the present invention: it also includes a micropore channel barrier layer 3, in this embodiment , the microporous channel blocking layer 3 is a glass sealing layer, and the glass sealing layer is integrally coated on the outer surface of the aforementioned heat-sensitive ceramic tile 1 with a thickness of 3.5 μm, and the aforementioned metal ohmic electrode 2 is preferably used but not absolutely limited. Aluminum, copper, silver-zinc alloy or base metal are used as the metal ohmic electrode, and the metal ohmic electrode 2 can be c...

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Abstract

The invention relates to a positive temperature coefficient ceramic thermistor element with strong reducing atmosphere resistance, and a preparation method thereof. The positive temperature coefficient ceramic thermistor element comprises a sintered thermal sensitive ceramic chip taking lead barium titanate as a base and metal ohmic electrodes positioned on two side surfaces of the thermal sensitive ceramic chip, and is characterized by also comprising a micro-pore channel blocking layer, the micro-pore channel blocking layer comprises a glass sealing layer or an organic matter sealant, when the micro-pore channel blocking layer is the glass sealing layer, the glass sealing layer integrally wraps the outer surface of the thermal sensitive ceramic chip, and the metal ohmic electrodes are combined on the two side faces of the glass sealing layer. When the micro-pore channel blocking layer is an organic matter sealant, the organic matter sealant fills and blocks micro-pores in the surfaces of the metal ohmic electrodes combined on the two side faces of the thermal sensitive ceramic chip and blocks gaps in the surfaces of the areas, without the metal ohmic electrodes, of the peripheral edge of the thermal sensitive ceramic chip at the same time. The severe environment resistance is improved, the service life is prolonged, and the reliability and expected service requirements of related heating groups are improved.

Description

technical field [0001] The invention belongs to the technical field of electronic components and their preparation, and in particular relates to a positive temperature coefficient ceramic thermistor element with strong resistance to reducing atmosphere, and also relates to a preparation method thereof. [0002] technical background [0003] The positive temperature coefficient (hereinafter referred to as PTC) ceramic thermal element is generally made of barium titanate-based semiconductor ceramic material. The characteristic of this thermal element is that its resistance value at room temperature will increase sharply by several order of magnitude, which produces the so-called PTC effect. The origin of this PTC effect is caused by the grain boundary barrier. The height of the grain boundary barrier is closely related to the concentration of oxygen atoms adsorbed on the grain boundary. Oxygen loss in the boundary, causing component performance failure or even loss of PTC effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C1/024C04B41/85C04B41/84
CPCH01C7/025H01C1/024C04B41/85C04B41/84C04B41/5022C04B41/009C04B41/4961C04B35/468C04B41/0072C04B41/90C04B41/52C04B2111/00844C03C8/04C03C8/06C03C8/16C03C3/112H01C17/06533H01C17/07C04B35/4684C04B41/51C04B41/5027C04B41/4539C04B41/522
Inventor 傅邱云何正安周东祥
Owner JIANGSU NEW LINZHI ELECTRONIC TECH CO LTD