Cooling-free type high temperature sensor based on composite material
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A high-temperature sensor and composite material technology, which is used in thermometers, instruments, thermometers and other directions that use electrical/magnetic components directly sensitive to heat. Longer life, increased continuity, and less temperature measurement error
Active Publication Date: 2014-07-16
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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[0003] The purpose of the present invention is to solve the problem of large measurement error and easy cracking of the shell of the high temperature sensor in the prior art, and proposes a non-cooling high temperature sensor based on composite materials
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Embodiment 1
[0025] A non-cooling high temperature sensor based on composite materials, including a thermocouple wire 1, an insulating porcelain tube 2, a casing 3, a mounting flange 4 and a plug 5; the casing 3 is made of C / SiC composite material, and the preparation method of the casing 3 is as follows :
[0026] Step 1. Weave a skeleton of the desired shape with C fibers to obtain a C fiber skeleton;
[0027] Step 2, growing SiC on the C fiber skeleton by means of chemical vapor deposition or chemical liquid phase deposition to complete the generation of the basic structure of the shell 3;
[0028] Step 3: Sinter the basic structure of the shell 3 described in step 2 in a sintering furnace. The basic structure of the shell 3 described in step 2 is sintered in a sintering furnace at a sintering temperature of 1850K.
[0029] The connection relationship of the high temperature sensor is as follows: the shell 3 is a hollow structure with a blind end, and a step is designed at the non-blin...
Embodiment 2
[0036] A non-cooling high temperature sensor based on composite materials, including a thermocouple wire 1, an insulating porcelain tube 2, a casing 3, a mounting flange 4 and a plug 5; the casing 3 is made of C / SiC composite material, and the preparation method of the casing 3 is as follows :
[0037] Step 1. Weave a skeleton of the desired shape with C fibers to obtain a C fiber skeleton;
[0038] Step 2, growing SiC on the C fiber skeleton by means of chemical vapor deposition or chemical liquid phase deposition to complete the generation of the basic structure of the shell 3;
[0039] Step 3: Sinter the basic structure of the shell 3 obtained in Step 2 in a sintering furnace at a sintering temperature of 1800K. For a thin-walled hollow shell 3 with a wall thickness of less than 2 mm, graphite is required to be used as a mandrel during weaving, and C fibers are woven on the graphite mandrel, and the graphite mandrel is removed after SiC growth is completed.
[0040]The co...
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Abstract
The invention belongs to high temperature sensors for high temperature measurement, relates to a composite material-based cooling-free type high temperature sensor which is applicable to the temperature measurement of high temperature air flow under 2100K, and belongs to the field of temperature testing. The cooling-free type high temperature sensor comprises a thermalcouple wire, an insulating porcelain tube, a shell, an installing flange and a plug, wherein the shell (partially or completely) is made from a C / SiC composite material; firstly, a framework of a required shape is woven by using C-fibers; secondly, SiC can grow on the C-fiber framework in a chemical gas deposition or chemical liquid deposition mode so as to accomplish the growth of a basic shell structure; subsequently, the shell is sintered in a sintering furnace, wherein the sintering temperature is 1770-1870K; and for a thin-wall hollow shell of which the wall thickness is less than 2mm, graphite is used as a core die when the thin-wall hollow shell is woven, the C-fibers are woven on the graphite core die, and the graphite core die is eliminated after the growth of the SiC. By utilizing the cooling-free type high temperature sensor, the temperature measurement error is reduced, the continuity of the shell material is increased, and the use performance of the temperature senor is improved and the service life of the temperature senor is prolonged.
Description
technical field [0001] The invention belongs to a temperature sensor for high temperature measurement, relates to a composite material-based non-cooling high temperature sensor suitable for measuring the temperature of a high temperature airflow below 2100K, and belongs to the field of temperature measurement. Background technique [0002] At present, in various fields of industry, the problem of measuring high temperature (generally above 1300K) is often encountered. The sensors used to measure the temperature of high-temperature air flow are generally water-cooled or air-cooled, and the maximum temperature that can be measured is 2000K. Due to the cooling protection of the shell, the root temperature is low, so the measurement error of the temperature sensor is very large, and the uncooled high-temperature sensor used in a small amount in the aviation field at present, because the shell is mostly made of SiC or Al2O3 ceramics, the material is brittle and has poor thermal s...
Claims
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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/04
Inventor 赵俭杨永军王毅
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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