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A method for measuring the thermal conductivity of micro-powder samples under different temperature and pressure conditions in a vacuum environment

A technology of micro-powder and thermal conductivity, which is applied in the field of mineral rock materials, can solve the problems of the analysis of extraterrestrial analog samples and the inability to have them at the same time, and achieve the effects of simplifying operations, reducing the amount of samples, and using less

Active Publication Date: 2018-01-30
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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  • A method for measuring the thermal conductivity of micro-powder samples under different temperature and pressure conditions in a vacuum environment
  • A method for measuring the thermal conductivity of micro-powder samples under different temperature and pressure conditions in a vacuum environment
  • A method for measuring the thermal conductivity of micro-powder samples under different temperature and pressure conditions in a vacuum environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Before the test method is improved, the sample is pre-treated. Prepare the pyroxene sample into a powder sample with a particle size not greater than 1mm according to your own needs to ensure that the sample is evenly mixed, and dry the sample before measurement.

[0027] (2) Before the test method is improved, the sample is installed. Choose 13.0cm 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.

[0028] (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 la...

Embodiment 2

[0035] This embodiment 2 all carries out relevant test work under the condition after test method improvement.

[0036] (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.

[0037] (2) Sample installation. Choose 4.7cm 3 Put the pretreated olivine powder sample and test probe into the sample cell according to step (1) and fix it, and finally put the sample cell into the vacuum chamber of the freeze dryer.

[0038] (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, and the temperature can be adjusted from -190°C to 200°C. Select a pressure and temperature for each measurement, and monitor the temperature drift after the pressure and temperature reach the specifie...

Embodiment 3

[0042] This embodiment 3 all carries out relevant test work under the condition after test method improvement.

[0043] (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.

[0044] (2) Sample installation. Choose 1.0cm 3 Put the simulated lunar soil powder sample and the test probe 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.

[0045] (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, and the temperature can be adjusted from -190°C to 200°C. Select a pressure and temperature for each measurement, and monitor the temperature drift after ...

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Abstract

The invention belongs to the field of mineral rock materials, in particular to a new method for measuring the thermal conductivity of trace (gram-level) mineral rock powder samples in a vacuum environment under variable temperature and pressure conditions. The required volume of the trace powder sample is in the range of 1.0 cm3 to 20.0 cm3 during testing. The method is carried out under vacuum conditions, and the testing steps are: (1) Sample pretreatment. According to your own needs, prepare the sample into a powder sample with a particle size not greater than 1mm to ensure that the sample is mixed evenly, and dry the sample before measurement. (2) Sample installation. Select sample pools of different sizes and volumes according to the amount of samples, put the pretreated samples and test probes into the sample pool and fix them, and finally put the sample pool into the vacuum chamber of the freeze dryer. (3) Sample test. Vacuumize the vacuum chamber of the freeze dryer, the pressure can be adjusted in the range of 1Pa~1.013×105 Pa, and the temperature in the chamber can be adjusted at the same time, the temperature can be adjusted in the range of -190℃~200℃. After the pressure and temperature reach the specified values, the thermal conductivity value of the sample under the specified test conditions is obtained by operating the relevant software of the thermal conductivity meter.

Description

technical field [0001] The invention belongs to the field of mineral and rock materials, in particular to a method for measuring the thermal conductivity of trace powder samples under different temperature and pressure conditions in a vacuum environment. Background technique [0002] 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 the measured object, average temperature, moisture content, heat transfer time, and temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/18
Inventor 李瑞于雯王世杰李雄耀金宏莫冰刘连银
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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