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Non-contact high-temperature thermophysical property parameter measurement device and non-contact high-temperature thermophysical property parameter measurement method

A non-contact, physical performance technology, applied in the direction of measurement device, strength characteristics, material thermal development, etc., can solve the problems of low reliability of measurement results, complex measurement process, high measurement cost, and improve the measurement temperature range and measurement results. Accurate, reduced measurement time effect

Active Publication Date: 2014-01-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing equipment for measuring the thermophysical properties of materials in high temperature environments generally has the following shortcomings: 1. High measurement cost; 2. Low reliability of measurement results; 3. The measurement process is complicated and difficult to control; 4. The temperature range that the equipment can measure is biased Low, unable to measure at ultra-high temperature; 5. The measurement time is too long

Method used

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  • Non-contact high-temperature thermophysical property parameter measurement device and non-contact high-temperature thermophysical property parameter measurement method
  • Non-contact high-temperature thermophysical property parameter measurement device and non-contact high-temperature thermophysical property parameter measurement method

Examples

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Effect test

Embodiment 1

[0034] Four graphite rods are used as heating elements, the diameter of the graphite rod is 20mm, the power of the laser generator is 6W, the laser frequency is 10kHz, the machining accuracy of the slideway and the laser generating system is 5.0μm, the minimum pressure of the vacuum pump is 0.05Pa, and the measurement temperature is 1500 ℃, using the equipment of the present invention to measure the thermophysical properties of the hafnium diboride sample, the size of the sample is 30mm×2mm×2mm (length×width×height).

[0035] The slide rail module is placed in the laser source module, and the thermal conductivity of hafnium diboride is measured by the national standard (GB / T22588-2008), and the time t for the back of the sample to reach half of the maximum temperature rise is measured. 1 / 2 , using the formula by computer: α=0.13879L 2 / t 1 / 2 The calculated thermal diffusivity is 0.2862cm 2 the s -1 , and use the formula: λ=αC p ρ calculates that the thermal conductivity of...

Embodiment 2

[0041] Five graphite rods are used as heating elements, the diameter of the graphite rod is 18mm, the power of the laser generator is 20W, the laser frequency is 20kHz, the machining accuracy of the slideway and the laser generating system is 8μm, the minimum pressure of the vacuum pump is 0.1Pa, and the preset measurement temperature is At 1600°C, use the equipment of the present invention to measure the thermophysical properties of hafnium diboride samples with known thermophysical properties. T22588-2008) to measure the thermal conductivity of hafnium diboride.

[0042] The testing and calculation process is the same as in Example 1. The test results are compared with the known results: the accuracy rate of mechanical properties is >98.3%, and the accuracy rate of thermal conductivity is >99.1%.

Embodiment 3

[0044] Six graphite rods are used as heating elements, the diameter of the graphite rod is 14mm, the power of the laser generator is 30W, the laser frequency is 30kHz, the machining accuracy of the slideway and the laser generating system is 15μm, the minimum pressure of the vacuum pump is 0.3Pa, and the preset measurement temperature is At 1700°C, use the equipment of the present invention to measure the thermophysical properties of hafnium diboride samples with known thermophysical properties. T22588-2008) to measure the thermal conductivity of hafnium diboride.

[0045] The testing and calculation process is the same as in Example 1. The test results are compared with the known results: the accuracy rate of mechanical properties is >99.4%, and the accuracy rate of thermal conductivity is >99.5%.

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Abstract

The invention discloses a non-contact high-temperature thermophysical property parameter measurement device and a non-contact high-temperature thermophysical property parameter measurement method. The non-contact high-temperature thermophysical property parameter measurement device consists of an electric heating system, a laser generation system, a load system, a strain measurement system and a data acquisition and analysis system. Laser serves as an instant energy source, and the measurement time is shortened; a laser comparator is used for measuring deformation of a material in a high-temperature environment; a non-contact laser comparator is used for measuring a deformation value of the measured material sample under high temperature; therefore, the deformation error caused by thermal expansion can be avoided; the laser comparator can precisely measure a precise displacement or strain of the sample under a condition of high-temperature loading through fine scales, so that the reliability of a measurement result is improved, and the measurement process is simplified and is easy to control. A thermocouple is used for measuring the temperature in a low-temperature stage, and a far infrared temperature measurer is used for measuring the temperature in a high-temperature stage, so that equipment can realize measurement of the thermophysical property of the material within the range from room temperature to 2,000 DEG C. The verification shows that the equipment has the advantages that the running process is easy to control, the measurement time is short, the accuracy is high, and the like.

Description

technical field [0001] The invention relates to a device and a method for measuring thermophysical property parameters of materials, more specifically, to a method and a device for measuring thermophysical properties of materials in a high-temperature environment. Background technique [0002] With the rapid development and leap-forward progress of science and technology, scientific research, industrial applications and other fields put forward higher and higher requirements for existing materials, which makes people have to develop new materials, and some properties of new materials in the development process require Evaluation and testing, but the existing equipment is often not up to the testing environment required in the testing process of these new materials, which in turn limits the development and application of new materials. Thermophysical properties are the basic characteristics of materials and one of the most critical properties of materials. Almost all technica...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N3/00
Inventor 沙建军代吉祥张兆甫王智
Owner DALIAN UNIV OF TECH
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