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A method for testing the thermal expansion coefficient of tiny samples using a nanomechanical tester

A technology of thermal expansion coefficient and tester, applied in the direction of material thermal expansion coefficient, etc., can solve the problems of special shape requirements and complex sample preparation, and achieve the effect of low sample requirements, wide application range and simple sample preparation.

Active Publication Date: 2020-12-08
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other test methods also have their own limitations, or are only applicable to some special materials, or have special requirements for the shape of the sample, or require special treatment of the surface of the sample, or need to predict many other mechanical parameters, or sample preparation Complexity, so there is an urgent need to develop new test methods

Method used

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  • A method for testing the thermal expansion coefficient of tiny samples using a nanomechanical tester
  • A method for testing the thermal expansion coefficient of tiny samples using a nanomechanical tester
  • A method for testing the thermal expansion coefficient of tiny samples using a nanomechanical tester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Thermal expansion coefficient test of aluminum sample

[0034] Test piece: aluminum wedge sample.

[0035] The test steps are as follows:

[0036] (1) Fix the aluminum wedge-shaped sample on the heating platform of the nanomechanical tester;

[0037] (2) Calibrate the equipment according to the equipment manual to ensure the normal operation of the equipment;

[0038] (3) Set the loading function, the maximum load is 8mN, the holding time is 240s, and the temperature rise program is set, the temperature is raised from 25°C to 45°C, the heating rate is 5°C / min, and the heating time is consistent with the holding time.

[0039] (4) At height h 1 The position 1 is tested, and the temperature starts to rise when the load reaches 8mN, and the displacement of the indenter changes with time (in the nanomechanical tester used this time, the displacement is positive downward), and the height h of position 1 is recorded at the same time 1 , in order to reduce th...

Embodiment 2

[0042] Embodiment two: the thermal expansion coefficient test of titanium sample

[0043] Test piece: titanium wedge sample.

[0044] The test steps are as follows:

[0045] (1) Fix the titanium wedge-shaped sample on the heating platform of the nanomechanical tester;

[0046] (2) Calibrate the equipment according to the equipment manual to ensure the normal operation of the equipment;

[0047] (3) Set the loading function, the maximum load is 8mN, the holding time is 240s, and the temperature rise program is set, the temperature is raised from 30°C to 50°C, the heating rate is 5°C / min, and the heating time is consistent with the holding time.

[0048] (4) At height h 1 When the load reaches 8mN, the temperature starts to rise, and the displacement of the indenter changes with time (note: in the nanomechanical tester used this time, the downward displacement is positive), and the height h of position 1 is recorded at the same time 1 , in order to reduce the measurement err...

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Abstract

A method for testing a thermal expansion coefficient of a small sample by using a nanomechanical tester comprises the following steps of preparing the sample into a wedge or stepped sample of a givengeometry and selecting two positions having a certain height difference on the sample; respectively marking the height and height difference; recording the temperature before and after the temperaturechange as well as the temperature change value; and during the temperature change, respectively measuring the height variation of the two positions by a high-precision displacement sensor in the nanomechanical tester, wherein the difference between the height variation of the two positions is the amount of expansion of the sample with a thickness of deltah at a temperature change deltaT, and thelinear thermal expansion coefficient alpha of the sample can be calculated by a formula. Using the nanomechanical tester combined with a heating stage, the method can realize the measurement of the thermal expansion coefficient of the small sample, is suitable for solid material testing, including crystals and amorphous bodies, and has the characteristics of low requirements on samples and simplesample preparation.

Description

technical field [0001] The invention belongs to the technical field of thermal performance evaluation of solid materials, in particular to a method for testing the thermal expansion coefficient of tiny samples by using a nanomechanical tester. Background technique [0002] Thermal expansion and contraction of objects are ubiquitous in nature. The main parameter to measure the thermal expansion of an object is the coefficient of thermal expansion of the materials that make up the object. The thermal expansion coefficient of a material is one of the basic thermophysical parameters of a substance and an important characteristic quantity that characterizes the properties of a material. Accurately measuring the thermal expansion coefficient of materials is of great significance for basic scientific research, technological innovation, and engineering applications. At present, there are many testing methods for the thermal expansion coefficient of materials, such as dial gauge me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16
CPCG01N25/16
Inventor 秦元斌单智伟解德刚黄龙超聂志宇杨岳清
Owner XI AN JIAOTONG UNIV
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