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Wide temperature range negative thermal expansion Laves phase alloy and preparation method thereof

A technology with negative thermal expansion and wide temperature range, applied in the field of negative thermal expansion Laves phase alloy materials, can solve the problems of narrow temperature window and impossibility of practical application

Active Publication Date: 2018-12-18
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accompanied by the phase transition, its volume shrinkage ΔV / V is as high as 1%, but due to the nature of its first-order phase transition, the temperature window of this lattice shrinkage is very narrow (several Kelvin) and cannot be used in practical applications.

Method used

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  • Wide temperature range negative thermal expansion Laves phase alloy and preparation method thereof
  • Wide temperature range negative thermal expansion Laves phase alloy and preparation method thereof
  • Wide temperature range negative thermal expansion Laves phase alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] According to the stoichiometric ratio, 11.17g iron block, 16.06g Hf rod (purity is 99.9%), and 1.81g Ta sheet are placed in a copper crucible, and arc melting is carried out 6 times under an argon atmosphere. After each arc melting is completed, the ingot is cast Stir once, then anneal under vacuum conditions, the annealing temperature is 1100°C, and the annealing time is 7 days, to obtain a wide temperature range negative thermal expansion Laves phase alloy Hf 0.9 Ta 0.1 Fe 2 .

Embodiment 2

[0029] According to the stoichiometric ratio, 11.17g iron block, 15.88g Hf rod (purity is 99.9%), and 1.99g Ta sheet are placed in a copper crucible, and arc melting is carried out 8 times under an argon atmosphere. The ingot was turned once, and then annealed under vacuum conditions, the annealing temperature was 900°C, and the annealing time was 7 days to obtain a wide temperature range negative thermal expansion Laves phase alloy Hf 0.89 Ta 0.11 Fe 2 .

Embodiment 3

[0031] Take by weighing 11.17g iron nugget, 15.71g Hf rod (purity is 99.9%), 2.17g Ta sheet according to stoichiometric ratio and place in copper crucible, carry out electric arc melting 7 times under argon atmosphere, after each electric arc melting is finished, put Turn the ingot once, then place the arc-melted ingot in a quartz tube, evacuate the quartz tube and seal it, place the sealed quartz tube in a box-type resistance furnace for annealing, the annealing temperature is 900°C, and the annealing time is In 7 days, the Laves phase alloy Hf with negative thermal expansion in wide temperature range was obtained 0.88 Ta 0.12 Fe 2 .

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Abstract

The invention provides a wide temperature range negative thermal expansion Laves phase alloy. The general formula of the wide temperature range negative thermal expansion Laves phase alloy is Hf1-x-yZryTaxFe2, wherein x is larger than or equal to 0.1 and less than or equal to 0.13, and y is larger than or equal to 0 and less than or equal to 0.2. According to the wide temperature range negative thermal expansion Laves phase alloy, by means of control over the ingredients of Ta, the negative thermal expansion temperature range of the wide temperature range negative thermal expansion Laves phasealloy is widened and is made to move to room temperature, and meanwhile, the wide temperature range negative thermal expansion Laves phase alloy has excellent mechanicalness, thermal conductivity, electric conductivity and wide application prospects; and meanwhile, because Zr is the main impurity in the Hf raw material, the raw material cost can be greatly lowered by taking low-purity Hf as the raw material. The invention further provides a preparation method for the wide temperature range negative thermal expansion Laves phase alloy.

Description

technical field [0001] The invention relates to the technical field of negative thermal expansion Laves phase alloy materials, in particular to a wide temperature range negative thermal expansion Laves phase alloy and a preparation method thereof. Background technique [0002] The volume of most materials in nature increases as the temperature rises and decreases as the temperature decreases, showing the characteristics of thermal expansion and contraction. This intrinsic property brings a lot of inconvenience and harm to the practical application of materials. For example, thermal fatigue or mechanical fatigue caused by thermal expansion and contraction will reduce the stability of the device, and even shorten the service life; some precision optical instruments will cause errors due to thermal expansion of core components. In addition, due to the mismatch of the expansion coefficients of the various materials in the device, the temperature change will cause a dimensional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/00C22C30/00C22C1/02C22F1/18
CPCC22C1/02C22C27/00C22C30/00C22F1/18
Inventor 王萌黎隆富林建超童鹏孙玉平宋文海朱雪斌
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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