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A High Stability Temperature Sensor Sensitive Element

A technology of temperature sensor and sensitive element, used in thermometers, thermometers and instruments using electrical/magnetic elements directly sensitive to heat, etc., can solve the problem of large difference in expansion coefficient between platinum film and ceramic substrate, and unsatisfactory component stability , unstable resistance and other problems, to reduce the transportation process, improve stability, and improve reliability.

Active Publication Date: 2021-03-16
重庆斯太宝科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to electron scattering on the upper and lower surfaces of the platinum film, when the high temperature is above 300 degrees, the resistance value of the resistor is unstable, and the measured temperature also fluctuates greatly; at the same time, the expansion coefficient of the platinum film and the ceramic substrate is quite different. During use, as the temperature rises or falls, stress occurs on the contact surface between the platinum film and the ceramic substrate, and the nominal resistance of the platinum resistance element also changes slightly, making the stability of the element unsatisfactory.

Method used

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  • A High Stability Temperature Sensor Sensitive Element
  • A High Stability Temperature Sensor Sensitive Element
  • A High Stability Temperature Sensor Sensitive Element

Examples

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Embodiment 1

[0034] A high stability temperature sensor sensitive element, as attached figure 1 As shown, it includes a ceramic substrate 6, a thick-film platinum layer 1, a thin-film platinum layer 2 and an insulating encapsulation layer 3. The thick-film platinum layer 1 is arranged on the ceramic substrate 6 by printing and sintering, and the thick-film platinum layer 1 has a network structure. The skeleton is honeycomb-shaped. The thin-film platinum layer 2 is filled in the skeleton by magnetron sputtering, and the thick-film platinum layer 1 and the thin-film platinum layer 2 are etched to form a temperature-sensing circuit. In this embodiment, the temperature-sensing circuit is preferably platinum commonly used in the prior art. Thermal resistance temperature sensing circuit.

[0035] The insulating encapsulation layer 3 wraps the surface of the thick-film platinum layer 1 and the thin-film platinum layer 2 (that is, the surface of the temperature-sensing circuit), the insulating en...

Embodiment 2

[0041] The difference between this embodiment and Embodiment 1 is that: figure 2 As shown, the temperature sensing circuit includes two ladder circuits, a Link circuit and two wide resistance conductors.

Embodiment 3

[0043] The difference between this embodiment and Embodiment 2 is that a method for manufacturing a high-stability temperature sensor sensitive element is also provided, including the following steps:

[0044] Platinum powder production steps: (1) dissolving step: using aqua regia to dissolve the platinum material to obtain a chloroplatinic acid solution.

[0045] (2) Purification step: Purify the chloroplatinic acid solution by purification technology to obtain ultra-high-purity sodium chloroplatinate. The specific purification steps are as follows: add analytically pure sodium chloride to the chloroplatinic acid solution to obtain a sodium chloroplatinate solution, adjust the pH value of the sodium chloroplatinate solution to 6 with a high-purity sodium hydroxide solution, and let it stand After 30 minutes, the solution was evaporated to dryness, and high-purity sodium chloroplatinate (purity above 99.999%) was obtained through hydrolysis and filtration. Through multiple pu...

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Abstract

The invention relates to the technical field of temperature detection, in particular to a sensitive element of a high-stability temperature sensor, comprising a ceramic substrate, on which a thick-film platinum layer and a thin-film platinum layer are arranged, and the thick-film platinum layer is a skeleton. The thin-film platinum layer is filled in the skeleton, and the thick-film platinum layer and the thin-film platinum layer constitute a temperature-sensing circuit; an insulating encapsulation layer is also included, and the insulating encapsulation layer wraps the thick-film platinum layer and the thin-film platinum layer; The temperature-sensing circuit includes a lead-out end connected with a lead-out wire, and the free end of the lead-out wire protrudes from the insulating encapsulation layer; the insulating encapsulation layer is provided with a reinforced encapsulation part for reinforcing the lead-out wire. The invention intends to provide a high-stability temperature sensor sensitive element with high stability and high reliability.

Description

technical field [0001] The invention relates to the technical field of temperature detection, in particular to a high-stability temperature sensor sensitive element. Background technique [0002] Existing temperature sensor sensitive elements are various, and the most commonly used one is the platinum resistance temperature sensor sensitive element. In terms of manufacturing process, the existing platinum resistance sensors are divided into three types. The first type is a wire-wound platinum resistor made of platinum wire, which has good stability, but is high in cost, large in size, small in resistance, and poor in shock resistance, so it is gradually eliminated by the market. [0003] The second type is a thick-film platinum resistance made by thick-film technology. Platinum paste is printed on the substrate by a thick-film printing process, and then heat-treated to finally produce a platinum resistance temperature sensor sensitive element. Because its structure is a hol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/18C03C12/00B22F9/24B22F1/00C23C14/18C23C14/34
CPCG01K7/18C03C12/00C23C14/3457C23C14/185B22F9/24B22F1/065B22F1/054
Inventor 胡轶吕正
Owner 重庆斯太宝科技有限公司
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