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New method for measuring heat conductivity coefficient of micro powder sample under variable temperature and variable pressure conditions

A technology of thermal conductivity and micro-powder, which is applied in the field of mineral rock materials, can solve the problems that cannot be obtained at the same time, and the analysis of extraterrestrial analog samples is hindered, and achieve the effects of simplifying operations, reducing sample volume, and improving efficiency

Active Publication Date: 2014-12-17
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used thermal conductivity meters cannot simultaneously meet the test conditions of temperature and pressure control in a vacuum environment, which has caused certain obstacles to the analysis of extraterrestrial analog samples.

Method used

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  • New method for measuring heat conductivity coefficient of micro powder sample under variable temperature and variable pressure conditions
  • New method for measuring heat conductivity coefficient of micro powder sample under variable temperature and variable pressure conditions
  • New method for measuring heat conductivity coefficient of micro powder sample under variable temperature and variable pressure conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Before the test method is improved, sample pretreatment. Prepare the pyroxene sample into a powder sample with a particle size not greater than 1mm according to your own needs, ensure that the sample is mixed evenly, and dry the sample before measurement.

[0029] (2) Before the test method is improved, the sample is installed. Choose 13.0 cm 3 Put the pretreated pyroxene powder sample and test probe into the sample cell according to step (1), and fix the sample cell in the original sample chamber of the thermal conductivity meter.

[0030] (3) Before the test method is improved, the sample is tested. The thermal conductivity of the pyroxene powder sample was measured under normal temperature and pressure conditions. For the analysis of the data results, see Figure 5 . from Figure 5 It can be seen that the same sample is measured at different times, and its thermal conductivity is affected by the environment, resulting in large data fluctuations and large dev...

Embodiment 2

[0037] This embodiment 2 all carries out relevant test work under the condition after test method improvement.

[0038] (1) Sample pretreatment. Prepare the olivine sample into a powder sample with a particle size not greater than 1mm according to your own needs, ensure that the sample is mixed evenly, and dry the sample before measurement.

[0039] (2) Sample installation. Choose 4.7 cm 3 Put the pretreated olivine powder sample and the test probe into the sample pool according to step (1) and fix them, and finally put the sample pool into the vacuum chamber of the freeze dryer.

[0040] (3) Sample test. Vacuumize the vacuum chamber of the freeze dryer, and the pressure can be adjusted from 1Pa to 1.013×10 5 Pa, and can also adjust the temperature in the chamber at the same time, the temperature adjustable range is -190℃~200℃. Select a pressure and temperature for each measurement, and monitor the temperature drift after the pressure and temperature reach the specified ...

Embodiment 3

[0044] This embodiment 3 all carries out relevant test work under the condition after test method improvement.

[0045] (1) Sample pretreatment. Prepare the simulated lunar soil sample into a powder sample with a particle size not greater than 1mm according to your own needs, ensure that the sample is mixed evenly, and dry the sample before measurement.

[0046] (2) Sample installation. Select 1.0 cm 3 Put the simulated lunar soil powder samples and test probes that have been pretreated according to step (1) into the sample pool and fix them, and finally put the sample pool into the vacuum chamber of the freeze dryer.

[0047] (3) Sample test. Vacuumize the vacuum chamber of the freeze dryer, and the pressure can be adjusted from 1Pa to 1.013×10 5 Pa, and can also adjust the temperature in the chamber at the same time, the temperature adjustable range is -190℃~200℃. Select a pressure and temperature for each measurement, and monitor the temperature drift after the pressu...

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Abstract

The invention belongs to the field of mineral and rock materials and in particular relates to a new method for measuring a heat conductivity coefficient of a micro (gram-scale) mineral and rock powder sample in a vacuum environment under variable temperature and variable pressure conditions. The needed volume of the micro powder sample is in a range from 1.0cm<3> to 20.0cm<3> during test. The method is performed under vacuum conditions and comprises the following test steps: (1) performing sample pretreatment, namely preparing the sample into a powder sample with the particle size of not more than 1mm according to own needs, ensuring that the sample is uniformly mixed, and drying the sample before measurement; (2) mounting the sample, namely selecting sample cells of different sizes and volumes according to the sample quantity, putting the pretreated sample and a test probe into the sample cells for fixing, and finally arranging the sample cells in a vacuum cavity of a freezer dryer; and (3) testing the sample, namely vacuumizing the vacuum cavity of the freezer dryer, adjusting the pressure to be in a range from 1Pa to 1.013*10<5>Pa, and adjusting the temperature in the cavity, wherein the adjustable temperature ranges from 190 DEG C below zero to 200 DEG C. After the pressure and temperature reach the specified values, the heat conductivity coefficient value of the sample under specified testing conditions is obtained through operation of thermal conductance meter related software.

Description

[0001] Li Rui, Wang Shijie, Li Xiongyao, Jin Hong, Liu Lianyin, Mo Bing technical field [0002] The invention belongs to the field of mineral rock materials, in particular to a new method for measuring the thermal conductivity of trace mineral rock powder sample materials under variable temperature and pressure conditions in a vacuum environment. Background technique [0003] In recent decades, with the continuous expansion of the application range of various materials in heat-related fields, thermal conductivity (or thermal conductivity) is often used to measure the thermal conductivity and thermal insulation properties of materials, and is an important parameter of materials. Understanding the thermal conductivity of a material is key to measuring its thermophysical properties. The lower the thermal conductivity value, the better the thermal insulation properties of the material. Since the thermal conductivity depends on many factors such as the structural composition of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/18
Inventor 李瑞王世杰李雄耀
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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