公开(公告)号：US20210394269A1

公开(公告)日：2021-12-23

申请号：US17288924

申请日：2020-04-08

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY ,  GUANGDONG HUAYI PLUMBING FITTINGS INDUSTRY CO., LTD. ,  SUN YAT-SEN UNIVERSITY CANCER CENTER

Inventor： Chao YANG ,  Haizhou LU ,  Yanfei DING ,  Yuanyuan LI ,  Jin WANG

IPC: B22F9/08 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  C22C19/03 ,  C22C19/00 ,  C22C14/00 ,  C22C1/04 ,  B22F1/00 ,  B22F10/28 ,  B23K26/342

Abstract: The present invention belongs to the field of additive manufacturing technology, and discloses a 4D printing method capable of in-situ regulating functional properties of nickel-titanium (NiTi) alloys and the application thereof. The method comprises the following steps: subjecting NiTi alloy bars to atomization milling to obtain NiTi alloy powder with a particle size of 15-53 μm, placing the NiTi alloy powder in a discharge plasma assisted ball mill for discharge treatment to promote the activation of powder activity, then adding nano-sized Ni powder with a particle size of 100-800 nm to obtain mixed powder, then continuing the discharge treatment to realize the metallurgical bonding between the NiTi alloy powder and the nano-sized Ni powder to obtain the modified powder, and finally using the additive manufacturing technology to prepare and form the modified powder into a functionalized NiTi alloy. The present invention achieves the metallurgical bonding between the nano-sized Ni powder and the large-sized spherical NiTi alloy powder by adding the nano-sized Ni powder in the process of discharge treatment, which is conducive to preparing a bulk alloy with uniform composition, structure and properties and the parts made therewith.

公开(公告)号：US20230415234A1

公开(公告)日：2023-12-28

申请号：US17976902

申请日：2022-10-31

Applicant: South China University of Technology ,  GUANGDONG HUAYI PLUMBING FITTINGS INDUSTRY CO., LTD.

Inventor： Chao YANG ,  Hongwei MA ,  Yanfei DING ,  Weisi CAI ,  Xiao YU

IPC: B22F10/28 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  C22C30/00 ,  C22C1/02 ,  B22F9/08 ,  B22F10/366

CPC classification number: B22F10/28 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  C22C30/00 ,  C22C1/02 ,  B22F9/082 ,  B22F10/366 ,  B22F2009/0836

Abstract: The invention belongs to the technical field of shape memory alloys and additive manufacturing, and discloses a NiTiHf high temperature shape memory alloy with two-way shape memory effect and a 4D printing method and application thereof. The 4D printing method includes alloy powder processing, model building and substrate preheating, and 4D printing forming. The present invention patent is based on the design concept of reducing thermal gradient and the environmental friendly concept of clean production. It adopts substrate preheating combined with low laser power and low scanning speed laser powder bed fusion technology or low preheating temperature electron beam powder bed fusion technology to improve the formed alloy. The lattice compatibility with the NiTi substrate reduces the residual stress of the formed sample, and produces no cracks, no obvious holes, density ≥99%, high phase transformation temperature, excellent tensile mechanical properties and two-way shape memory effect.

公开(公告)号：US20210394268A1

公开(公告)日：2021-12-23

申请号：US17288918

申请日：2020-01-03

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY ,  GUANGDONG HUAYI PLUMBING FITTINGS INDUSTRY CO., LTD. ,  SUN YAT-SEN UNIVERSITY CANCER CENTER

Inventor： Chao YANG ,  Haizhou LU ,  Yanfei DING ,  Yuanyuan LI ,  Jin WANG

IPC: B22F9/08 ,  B33Y10/00 ,  B33Y70/00 ,  B33Y40/10 ,  C22C19/03 ,  C22C19/00 ,  B22F10/28 ,  B22F1/00 ,  C22C1/04 ,  B23K26/342

Abstract: A 4D printing method for a titanium-nickel shape memory alloy, and the titanium-nickel shape memory alloy and application thereof. Pure titanium and pure nickel are mixed and smelted, and titanium-nickel alloy bars are obtained; then alloy powder is prepared by means of a rotating electrode atomization method, the powder is sieved, and titanium-nickel alloy powder having a grain size of 15-53 μm is obtained; and the obtained titanium-nickel alloy powder is placed in a discharge plasma auxiliary ball mill to be subjected to discharge treatment, the powder is subjected to surface modification, and finally the titanium-nickel shape memory alloy is formed by means of SLM forming. The phase composition of the titanium-nickel shape memory alloy is composed of a B2 austenite phase of a CsCl type structure, a B19′ Martensite phase of a monocline structure and a Ti2Ni precipitated phase. The microstructure of the memory alloy comprises nano-sized cellular-like crystals and micron-sized dendritic crystals, and the cellular-like crystals and the dendritic crystals are alternately distributed in a layered manner. The memory alloy has the characteristics of being unique in structure, nearly fully dense and ultrahigh in performance.

公开(公告)号：US12226819B2

公开(公告)日：2025-02-18

申请号：US17288924

申请日：2020-04-08

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY ,  GUANGDONG HUAYI PLUMBING FITTINGS INDUSTRY CO., LTD. ,  SUN YAT-SEN UNIVERSITY CANCER CENTER

Inventor： Chao Yang ,  Haizhou Lu ,  Yanfei Ding ,  Yuanyuan Li ,  Jin Wang

IPC: B22F1/00 ,  B22F1/05 ,  B22F1/14 ,  B22F1/17 ,  B22F9/08 ,  B22F10/28 ,  B22F10/34 ,  B22F10/36 ,  B22F10/366 ,  B23K26/342 ,  B23K103/14 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  C22C1/04 ,  C22C14/00 ,  C22C19/00 ,  C22C19/03

Abstract: The present invention belongs to the field of additive manufacturing technology, and discloses a 4D printing method capable of in-situ regulating functional properties of nickel-titanium (NiTi) alloys and the application thereof. The method comprises the following steps: subjecting NiTi alloy bars to atomization milling to obtain NiTi alloy powder with a particle size of 15-53 μm, placing the NiTi alloy powder in a discharge plasma assisted ball mill for discharge treatment to promote the activation of powder activity, then adding nano-sized Ni powder with a particle size of 100-800 nm to obtain mixed powder, then continuing the discharge treatment to realize the metallurgical bonding between the NiTi alloy powder and the nano-sized Ni powder to obtain the modified powder, and finally using the additive manufacturing technology to prepare and form the modified powder into a functionalized NiTi alloy. The present invention achieves the metallurgical bonding between the nano-sized Ni powder and the large-sized spherical NiTi alloy powder by adding the nano-sized Ni powder in the process of discharge treatment, which is conducive to preparing a bulk alloy with uniform composition, structure and properties and the parts made therewith.

公开(公告)号：US12084746B2

公开(公告)日：2024-09-10

申请号：US17288918

申请日：2020-01-03

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY ,  GUANGDONG HUAYI PLUMBING FITTINGS INDUSTRY CO., LTD. ,  SUN YAT-SEN UNIVERSITY CANCER CENTER

Inventor： Chao Yang ,  Haizhou Lu ,  Yanfei Ding ,  Yuanyuan Li ,  Jin Wang

IPC: C22C19/03 ,  B22F1/14 ,  B22F9/08 ,  B23K26/342 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  C22C1/04 ,  C22C19/00 ,  B22F10/28 ,  B22F10/34 ,  B22F10/36 ,  B23K103/14

CPC classification number: C22C19/03 ,  B22F1/14 ,  B22F9/082 ,  B23K26/342 ,  B33Y10/00 ,  B33Y40/10 ,  B33Y70/00 ,  C22C1/0433 ,  C22C19/007 ,  B22F2009/0836 ,  B22F10/28 ,  B22F10/34 ,  B22F10/36 ,  B22F2301/15 ,  B22F2304/10 ,  B23K2103/14 ,  B22F2998/10 ,  B22F2009/041 ,  B22F9/082 ,  B22F1/142 ,  B22F10/28

Abstract: Disclosed are a 4D printing method and application of titanium-nickel shape memory alloy. The 4D printing method comprises the following steps: mixing and smelting pure titanium and pure nickel to obtain titanium-nickel alloy bars, then preparing alloy powder by a rotating electrode atomization method, and sieving the powder to obtain titanium-nickel alloy powder with a particle size of 15-53 μm; placing the obtained titanium-nickel alloy powder in a discharge plasma assisted ball mill for discharge treatment to perform surface modification of the powder; and subjecting the titanium-nickel alloy powder to SLM forming to obtain the titanium-nickel shape memory alloy.