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A kind of graphite silicon carbide thermocouple protective sleeve and preparation method thereof

A silicon carbide and thermocouple technology, applied in the direction of measuring heat, instruments, thermometer parts, etc., can solve the problems of short service life, weak oxidation resistance and corrosion resistance of protective sleeve, etc., to improve product qualification rate and parameters The effect of low control difficulty and less pollution

Active Publication Date: 2020-08-25
青岛富泰兴碳素制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermocouple protective sheath prepared by this invention can solve the problem of the protective sheath being corroded and oxidized by high-temperature aluminum liquid to a certain extent, but has the following disadvantages: due to the inherent defects of the graphite material itself, the protective sheath made by this method has low oxidation resistance and corrosion resistance. Still weak performance and short lifespan

Method used

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  • A kind of graphite silicon carbide thermocouple protective sleeve and preparation method thereof
  • A kind of graphite silicon carbide thermocouple protective sleeve and preparation method thereof
  • A kind of graphite silicon carbide thermocouple protective sleeve and preparation method thereof

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Effect test

Embodiment 1

[0039] Embodiment one: a kind of graphite silicon carbide thermocouple protection sleeve, such as figure 1 with figure 2 As shown, the graphite tube body 1 is included, and a metal mesh 4 is installed inside the graphite tube body 1. The graphite tube body 1 is provided with a central hole 13 along the axial direction, and the inner wall of the graphite tube body 1 is located in the middle of the central hole 13. -SiC composite layer 2, one end of the graphite tube body 1 is located on the inner wall of the central hole 13, and a C-C composite layer 3 is provided.

[0040] refer to figure 2 with image 3 1. Increase the diameter of the central hole 13 at one end of the graphite tube body 1 to form a reaming hole 11, and the middle part of the reaming hole 11 is provided with an internal thread 12 10-20mm away from the end face. The surface of the C / C-SiC composite layer 2 is provided with a spiral rib 21 along the axial direction, and the rib 21 cooperates with the intern...

Embodiment 2

[0043] Embodiment two: a kind of preparation method of graphite silicon carbide thermocouple protective cover, comprises the following steps:

[0044] S1: Filling density in a cylindrical mold with an inner diameter of 100mm and a height of 180mm is 0.20g / cm 3 Graphite powder, the fixed carbon of graphite powder is not less than 95%, the particle size is 70 mesh, and the density of press molding is 1.60g / cm 3 The graphite tube body 1 has a wall thickness of 30 mm; the graphite tube body 1 is integrally formed with a central hole 13 and a reaming hole 11 .

[0045] S2: Take the graphite tube body 1 out of the mold, clean up the graphite powder in the reamed hole 11, fill the reamed hole 11 with a mixture of graphite powder and silicon powder at a mass ratio of 3:7, the mixture used The fixed carbon of graphite powder is not less than 99.99%, the mass purity of silicon powder is not less than 99.99%, the particle size of graphite powder and silicon powder is 100 mesh, and the d...

Embodiment 3

[0048] Embodiment three: a kind of preparation method of graphite silicon carbide thermocouple protective cover, comprises the following steps:

[0049] S1: Filling density in a cylindrical mold with an inner diameter of 100mm and a height of 180mm is 0.30g / cm 3 Graphite powder, the fixed carbon of graphite powder is not less than 95%, the particle size is 70 mesh, and the density of press molding is 1.70g / cm 3 The graphite tube body 1 has a wall thickness of 30 mm; the graphite tube body 1 is integrally formed with a central hole 13 and a reaming hole 11 .

[0050] S2: Take the graphite tube body 1 out of the mold, clean up the graphite powder in the reamed hole 11, fill the reamed hole 11 with a mixture of graphite powder and silicon powder at a mass ratio of 3:7, the mixture used The fixed carbon of graphite powder is not less than 99.99%, the mass purity of silicon powder is not less than 99.99%, the particle size of graphite powder and silicon powder is 200 mesh, and the...

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Abstract

The invention discloses a graphite silicon carbide thermocouple protective sleeve and a preparation method thereof, and relates to the technical field of graphite deep processing. The main point of the technical solution is that the thermocouple protective sleeve includes a graphite tube body with a central hole, and the graphite tube body is located in the central hole. The side wall of the middle part is provided with a C / C-SiC composite layer, one end of the graphite tube body is located on the side wall of the central hole, and a C / C composite layer is provided, and the graphite tube body, the C / C-SiC composite layer and the C / C composite layer are integrated . The invention solves the problem of low service life of the existing thermocouple protective sleeve made of graphite material due to poor mechanical properties and weak oxidation resistance, and improves the oxidation resistance and strength of the thermocouple protective sleeve through the graphite silicon carbide composite material, prolonging the service life .

Description

technical field [0001] The invention relates to the technical field of graphite deep processing, more specifically, it relates to a graphite silicon carbide thermocouple protective sleeve and a preparation method thereof. Background technique [0002] When the thermocouple protective sheath is formed by joining two conductors with different components into a loop, when the temperature of the two junctions is different, a thermal current will be generated in the loop. If there is a temperature difference between the working end of the thermocouple and the reference end, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. Industrial thermocouple protection sleeves are used as temperature measurement sensors, and are usually used together with temperature transmitters, regulators, and display instruments to form a process control system, which is used to directly measure or control fluids in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K1/08G01K1/10C04B35/52C04B41/89
Inventor 董绍军
Owner 青岛富泰兴碳素制品有限公司
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