Title:
NITIHF HIGH-TEMPERATURE SHAPE MEMORY ALLOY WITH TWO-WAY MEMORY EFFECT, AND 4D PRINTING METHOD THEREFOR AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/245879
Kind Code:
A1
Abstract:
The present invention belongs to the technical fields of a shape memory alloy and additive manufacturing. Disclosed are a NiTiHf high-temperature shape memory alloy with a two-way memory effect, and a 4D printing method therefor and the use thereof. The 4D printing method comprises: the preparation of a powder from an alloy, model construction and substrate preheating, and forming by means of 4D printing. In the present invention patent, on the basis of the design concept of reducing a thermal gradient and the environmental protection concept of clean production, substrate preheating is combined with a laser powder bed fusion technique having a low laser power and a low scanning speed or an electron beam powder bed fusion technique having a low preheating temperature, such that the lattice compatibility of a formed alloy and a NiTi substrate is improved, the residual stress of a formed sample is reduced, a NiTiHf high-temperature shape memory alloy with no cracks and no obvious holes, a density of ≥99%, a high phase transition temperature, good tensile mechanical properties and a two-way memory effect is prepared, and the application of the NiTiHf high-temperature shape memory alloy in high-temperature fields is broadened.
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Inventors:
YANG CHAO (CN)
MA HONGWEI (CN)
DING YANFEI (CN)
CAI WEISI (CN)
YU XIAO (CN)
MA HONGWEI (CN)
DING YANFEI (CN)
CAI WEISI (CN)
YU XIAO (CN)
Application Number:
PCT/CN2022/117722
Publication Date:
December 28, 2023
Filing Date:
September 08, 2022
Export Citation:
Assignee:
UNIV SOUTH CHINA TECH (CN)
GUANGDONG HUAYI PLUMBING FTTINGS IND CO LTD (CN)
GUANGDONG HUAYI PLUMBING FTTINGS IND CO LTD (CN)
International Classes:
C22C1/04; B22F9/08; B22F9/14; B22F10/28; B22F10/366; B33Y10/00; B33Y40/10; B33Y70/00; B33Y80/00; C22C30/00
Foreign References:
| CN114346259A | 2022-04-15 | |||
| CN113430419A | 2021-09-24 | |||
| US20170246682A1 | 2017-08-31 |
Other References:
NEMATOLLAHI MOHAMMADREZA, TOKER GUHER P., SAFAEI KEYVAN, HINOJOS ALEJANDRO, SAGHAIAN S. EHSAN, BENAFAN OTHMANE, MILLS MICHAEL J., : "Laser Powder Bed Fusion of NiTiHf High-Temperature Shape Memory Alloy: Effect of Process Parameters on the Thermomechanical Behavior", METALS, M D P I AG, CH, vol. 10, no. 11, CH , pages 1522, XP093120844, ISSN: 2075-4701, DOI: 10.3390/met10111522
Attorney, Agent or Firm:
GUANGZHOU HUAXUE INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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