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A zero-expansion alloy in a wide temperature range with abnormal compositional fluctuations and its preparation method

A technology with fluctuating composition and zero expansion, applied in the field of zero-expansion alloys and preparation in a wide temperature range, can solve the problems of shortening the service life of materials and the scope of application

Active Publication Date: 2021-11-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most substances show the property of thermal expansion and contraction with temperature changes, however, the dimensional changes and thermal stress caused by thermal expansion will greatly shorten the service life and application range of materials

Method used

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  • A zero-expansion alloy in a wide temperature range with abnormal compositional fluctuations and its preparation method
  • A zero-expansion alloy in a wide temperature range with abnormal compositional fluctuations and its preparation method
  • A zero-expansion alloy in a wide temperature range with abnormal compositional fluctuations and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of the standardized constituent component of the present invention is HF 0.6 Ti 0.4 FE 2 The intermetallic compound is synthesized by the anti-furnace melting method, and the reaction equation is as follows:

[0042] 0.6 × HF + 0.4 × Fe + 2.0 × Fe = HF 0.6 Ti 0.4 FE 2

[0043] Specific operations are performed in the following steps:

[0044] 5g of HF, Ti, Fe raw material 5g of HF, Ti, Fe raw material was 0.6: 0.4: 2.0, respectively. The raw material is placed in an electric arc furnace, vacuuming the furnace (vacuum -3PA), after the vacuum is filled with an inert gas in the furnace, and then smelt 3-5 times under the protective gas atmosphere, 1-2 min each time until uniform. The resulting sample was annealed at 800 ° C for 7 days under vacuum or inert atmosphere. The X-ray diffraction results show that the obtained product is macroscopically in the C14 structure, no other impurities phase.

Embodiment 2

[0046] Preparation of the non-chemical measurement ratio of the present invention is HF 0.6 Ti 0.4 FE 2.5 The synthetic zero-expanded metal compound block is synthesized by an electric arc furnace, and the reaction equation is as follows:

[0047] 0.6 × HF + 0.4 × Fe + 2.5 × Fe = HF 0.6 Ti 0.4 FE 2.5

[0048] Specific operations are performed in the following steps:

[0049] The molar ratio was called HF, Ti, Fe raw material 5g of 0.6: 0.4: 2.5, respectively. The raw material is placed in an electric arc furnace, vacuuming the furnace (vacuum -3 PA), after the vacuum is filled with an inert gas in the furnace, and then smelt 3-5 times under the protective gas atmosphere, 1-2 min each time until uniform. The resulting sample was annealed at 1000 ° C for 6 days under vacuum or inert atmosphere. The X-ray diffraction results show that the obtained product is macroscopically in the C14 structure, no other impurities phase.

[0050] The non-chemical measurement zero expansion material...

Embodiment 3

[0055] Preparation of the non-chemical measurement ratio of the present invention is HF 0.6 Ti 0.4 FE 2.2 The synthetic zero-expanded metal compound block is synthesized by an electric arc furnace, and the reaction equation is as follows:

[0056] 0.6 × HF + 0.4 × Fe + 2.2 × Fe = HF 0.6 Ti 0.4 FE 2.2

[0057] Specific operations are performed in the following steps:

[0058] The molar ratio was called 5g of HF, Ti, Fe raw material 5g of 0.6: 0.4: 2.2, respectively. The raw material is placed in an electric arc furnace, vacuuming the furnace (vacuum -3 PA), after the vacuum is filled with an inert gas in the furnace, and then smelt 3-5 times under the protective gas atmosphere, 1-2 min each time until uniform. The resulting sample was annealed at 1200 ° C for 3 days under vacuum or inert atmosphere. The X-ray diffraction results show that the obtained product is macroscopically in the C14 structure, no other impurities phase.

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Abstract

The invention belongs to the field of phase change alloy preparation, and in particular relates to a wide temperature range zero-expansion alloy with abnormal component fluctuation and a preparation method. The atomic percentage expression of this wide temperature region zero expansion alloy with abnormal composition fluctuation is Hf 0.6 Ti 0.4 Fe 2+x , where 0<x≤1. The zero-expansion alloy phase belongs to the hexagonal system, in which Hf and Ti are distributed in the 4f site, Fe is distributed in the 2a and 6h sites, and the excess Fe occupies the Hf / Ti site, and the microstructure shows periodic rich-Hf and rich-Ti regions Alternately, macroscopically, it shows zero expansion in a wide temperature range. The beneficial effects of the invention are: the synthesis steps are simple and easy to realize, and the continuous positive and negative thermal expansion coupling formed by periodic component fluctuations is more stable than the traditional two-phase composite structure, and the wide temperature range zero-expansion alloy with abnormal component fluctuations is stable at 100 It exhibits zero expansion characteristics in the temperature range of ~500K, and the linear expansion coefficient α l ≤1.8×10 ‑6 .

Description

Technical field [0001] The invention belongs to the field of phase change alloy, and more particularly to zero expansion alloys and preparation methods having an abnormal constant fluctuations. Background technique [0002] Most substances exhibit thermal expansion and contraction with temperature changes, but due to the dimensional changes in thermal expansion and thermal stress will greatly shorten the life and application range of materials. In many precision instruments, such as aerospace (in space, the temperature difference between the surface of the spacecraft in space is large, with great thermal stress), electronic equipment (the main reason for the failure of multi-layer ceramic capacitors is the heat generated by the Si chip The capacitor does not match the thermal expansion of the surrounding material). Therefore, the development of new zero expansion (ZTE) materials (materials that do not have any changes in their own dimensions) are essential for practical applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/00C22C30/00C22C33/04C21D1/74C21D1/26C21D1/773
CPCC21D1/26C21D1/74C21D1/773C22C30/00C22C33/04C22C38/002C22C38/14
Inventor 林鲲张文斌邢献然
Owner UNIV OF SCI & TECH BEIJING