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Method for testing solid-liquid phase change volume change rate of material

A technology of variable volume and rate of change, applied in the field of material science research, can solve problems such as precise measurement and large human errors, and achieve the effects of improving accuracy, meeting test requirements, and low cost

Inactive Publication Date: 2020-10-30
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume per unit mass of the liquefied material is difficult to accurately measure with a simple device, and the method of reading the volume of the liquid from the volume measurement container brings too much human error

Method used

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  • Method for testing solid-liquid phase change volume change rate of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Prepare a dense block of pure tin about 2cm x 2cm x 2cm, and polish the surface, as well as a sufficient amount of tin for melting. Using DSC to calibrate the melting point of tin is 232°C. Weigh the mass m1 of the tin standard block in air. Put the bracket and thin copper wire on the weighing platform of the balance and clear the balance, then hang the tin standard block in the water with a metal filament, measure the mass m2 under the buoyancy of the sample block to be tested, the tin to be tested The density of the solid is ρ1, and the density of the solid is calculated using the following formula: m1 / ρ1=(m1-m2) / ρwater, and the density of water is 1g / cm 3 calculate.

[0049] Select pure copper as an auxiliary material to prepare a dense pure copper block of about 2cm×2cm×2cm, whose melting point is 1085°C, which is higher than that of tin. The coefficient of linear expansion of pure copper in the range of 20-300°C is 17.64×10 -6 / °C. Weigh the mass m3 of the cop...

Embodiment 2

[0055] A dense block of pure indium of about 1 cm×1 cm×1 cm is prepared, the surface is polished, and a sufficient amount of indium is used for melting. The melting point temperature of indium was calibrated by DSC to be 157°C. Weigh the mass m1 of the indium block in air. Put the bracket and thin copper wire on the weighing platform of the balance and clear the balance, then hang the indium standard block in the water with a metal filament, measure the mass m2 under the buoyancy of the sample block to be tested, and the indium to be measured The density of the solid is ρ1, and the density of the solid is calculated using the following formula: m1 / ρ1=(m1-m2) / ρwater, and the density of water is 1g / cm 3 calculate.

[0056] Select pure copper as the auxiliary material to prepare a dense pure copper block of about 1cm×1cm×1cm, and its melting point is 1085°C, which is higher than that of indium. The coefficient of linear expansion of pure copper in the range of 20-200°C is 17.2...

Embodiment 3

[0062] A dense block of epoxy resin approximately 2.5 cm x 2.5 cm x 2.5 cm was prepared and the surface was polished, along with sufficient epoxy resin for melting. The melting temperature range of epoxy resin calibrated by DSC is 140-160°C. Weigh the mass m1 of the epoxy resin block in air. Put the bracket and thin copper wire on the weighing platform of the balance and clear the balance, then hang the epoxy resin block in the water with metal filaments, measure the mass m2 under the buoyancy of the block, and the epoxy resin to be tested The density of the resin solid is ρ1, and the density of the solid is calculated using the following formula: m1 / ρ1=(m1-m2) / ρwater, and the density of water is 1g / cm 3 calculate.

[0063] Select pure aluminum as the auxiliary material to prepare a dense pure aluminum block of about 2.5cm×2.5cm×2.5cm, whose melting point is 660°C, which is higher than that of epoxy resin. The linear expansion coefficient of pure aluminum in the range of 20...

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Abstract

The invention relates to a method for testing the solid-liquid phase change volume change rate of a material, and belongs to the field of material science research. The method comprises the followingsteps: (1) measuring the density of a to-be-measured material by using a drainage method; (2) selecting an auxiliary material of which the density and the melting point are higher than those of the to-be-measured material, and measuring the density of the auxiliary material by the drainage method; (3) heating the to-be-detected material to a temperature higher than the phase transition temperatureof the to-be-detected material, and when the temperature of the to-be-measured material does not reach the phase change temperature of the auxiliary material, converting the to-be-measured material into a liquid state, completely immersing and suspending the auxiliary material in the to-be-measured material converted into the liquid state, measuring the density of the to-be-measured material converted into the liquid state, and calculating the volume change rate of the to-be-measured material converted into the liquid state from the solid state through a formula. The test method provided by the invention is simple, accurate, high in efficiency and low in cost, and can meet various test requirements in the field of material science.

Description

technical field [0001] The invention belongs to the field of material science research and relates to a simple and efficient method for testing the volume change rate of solid-liquid phase transition of materials. Background technique [0002] In recent years, people have paid more and more attention to materials science. It is well known that the volume per unit mass of a material changes with the change of temperature, especially when the material undergoes a solid-liquid phase transition, the volume change rate is more significant. Therefore, it is of great significance to obtain the volume expansion rate of the solid-liquid phase transition of the metal material . In the field of materials science and engineering research, the data of the volume change rate of the solid-liquid phase transition of materials is often needed, such as the control of the stress of the weld joint, the packaging of the solid-liquid phase transition material, etc. However, there are no standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/36G01N9/02
CPCG01N9/36G01N9/02G01N2009/026
Inventor 黄树晖郭宏解浩峰张习敏彭丽军张文婧杨振冯雪米绪军黄国杰
Owner GRIMAT ENG INST CO LTD
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