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Wide-temperature-range huge negative thermal expansion metal-based composite material and preparation method thereof

A technology of negative thermal expansion and composite materials, which is applied in the field of composite materials, can solve the problems of few types of negative thermal expansion materials, narrow temperature, and unsatisfaction with actual needs, and achieve the effects of low cost, improved mechanical properties, and simple preparation process

Active Publication Date: 2022-05-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the material application scenarios on the market today are carried out around room temperature, but there are few types of negative thermal expansion materials at room temperature and there are two limitations. One is that the temperature is narrow, which does not meet the actual needs; There is a negative thermal expansion in the direction and the application is limited

Method used

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  • Wide-temperature-range huge negative thermal expansion metal-based composite material and preparation method thereof
  • Wide-temperature-range huge negative thermal expansion metal-based composite material and preparation method thereof
  • Wide-temperature-range huge negative thermal expansion metal-based composite material and preparation method thereof

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Embodiment 1

[0041] This embodiment provides a huge negative thermal expansion metal matrix composite material in a wide temperature range and a preparation method thereof. The huge negative thermal expansion metal matrix composite material is La(Fe 1-y-z ,Co y , Si z ) 13 system materials, including the following steps:

[0042] Step S101, according to the stoichiometric ratio of 1:11.5-n:n:1.5 (n=0.4, 0.6, 0.8, 1.0, 1.2, 1.4), respectively weigh the metal elements La, Fe, Co, Si (purity ≥ 99.5%), Placed in an electric arc furnace, smelted at high temperature under an argon atmosphere, smelted 4 times, turned the ingot once after each smelting to homogenize the alloy ingot, and annealed the prepared alloy ingot at 700°C in a vacuum environment for 5 days, six kinds of alloys were obtained; the purpose of long-time high-temperature annealing of alloy ingots is to make the alloy ingots completely generate NaZn 13 Type cubic phase crystal structure La(Fe, Co, Si) 13 , due to NaZn 13 La...

Embodiment 2

[0053] This embodiment provides a huge negative thermal expansion metal matrix composite material in a wide temperature range and a preparation method thereof. The huge negative thermal expansion metal matrix composite material is La(Fe 1-y-z ,Co y , Si z ) 13 system materials, including the following steps:

[0054] Step S201, according to the stoichiometric ratio of 1:11.5-n:n:1.5 (n=0.4, 0.6, 0.8, 1.0, 1.2, 1.4), respectively weigh the metal elements La, Fe, Co, Si (purity ≥ 99.5%), Placed in an electric arc furnace, smelted at a high temperature under an argon atmosphere, smelted 8 times, turned the ingot once after each smelting to homogenize the alloy ingot, and annealed the prepared alloy ingot at 1300°C in a vacuum environment for 15 Days, get six alloys.

[0055] Step S202, adding alcohol to the annealed alloy ingot and grinding it into powder. The particle size of the alloy powder is in the range of 0.5-100 μm. The grinding method includes manual grinding and bal...

Embodiment 3

[0060] This embodiment provides a huge negative thermal expansion metal matrix composite material in a wide temperature range and a preparation method thereof. The huge negative thermal expansion metal matrix composite material is La(Fe 1-y-z ,Co y , Si z ) 13 system materials, including the following steps:

[0061] Step S301, according to the stoichiometric ratio of 1:11.5-n:n:1.5 (n=0.4, 0.6, 0.8), respectively weigh the metal elements La, Fe, Co, Si (purity ≥ 99.5%), and place them in an electric arc furnace, High-temperature smelting under argon atmosphere, smelting 4 times, turning the ingot once after each smelting to homogenize the alloy ingot, and annealing the prepared alloy ingot at 1000°C for 10 days in a vacuum environment to obtain three alloys .

[0062] Step S302, adding alcohol to the annealed alloy ingot and grinding it into powder. The particle size of the alloy powder is in the range of 0.5-100 μm. The grinding method includes manual grinding and ball m...

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Abstract

The invention provides a wide-temperature-range huge negative thermal expansion metal-based composite material and a preparation method thereof, and belongs to the field of metal-based composite materials and preparation thereof. The raw material is La (Fe, Si) 13-based isotropic negative thermal expansion alloy; the preparation method comprises the following steps: weighing metal elementary substances in a stoichiometric ratio, smelting the metal elementary substances in an electric arc furnace, annealing to obtain La (Fe, Si) 13 alloys with different negative thermal expansion coefficients and temperature zones, grinding and mixing the La (Fe, Si) 13 alloys, and sintering the La (Fe, Si) 13 alloys through discharge plasma to obtain a target product. Alpha-Fe phases are generated among the components of the La (Fe, Si) 13 alloy, so that the mechanical property is improved, and the La (Fe, Si) 13 alloy can better adapt to extreme use environments. The La (Fe, Si) 13-based series alloy has huge negative thermal expansion in different temperature zones between-150 DEG C and 150 DEG C. The material obtained by compounding the La (Fe, Si) 13 alloy with different components has the characteristics of wide temperature range and isotropic negative thermal expansion.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a metal-based composite material with huge negative thermal expansion in a wide temperature range and a preparation method thereof. Background technique [0002] Thermal expansion is an inherent property in solid materials, and most materials increase in volume with increasing temperature, ie positive expansion. Different materials have different coefficients of thermal expansion, which leads to problems such as failure or damage of devices in applications when the ambient temperature changes, which brings many difficulties to actual production and life. With the continuous development of high-end technical fields such as aerospace, medical, electronics, communications, and military industry, the requirements for the precision of materials are higher, and traditional materials are difficult to meet the high-precision requirements. The discovery of negative thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/02B22F3/105
CPCC22C38/005C22C38/002C22C33/0278B22F3/105B22F2003/1051
Inventor 陈骏庞雪鹭宋玉柱周畅施耐克
Owner UNIV OF SCI & TECH BEIJING
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