South China University of Technology

Midea Group Co., Ltd.

Guangdong Huayi Plumbing Fittings Industry Co., Ltd.

Sun Yat-sen University Cancer Center

Kaiping Freendo Sanitary Ware Co., Ltd.

Microtera Semiconductor (guangzhou) Co., Ltd.

Chao Yang

Yuanyuan Li

Yanfei Ding

Xian'an Liu

Weixi Peng

Yaguang Yao

Jin Wang

Shengguan Qu

Weiwen Zhang

Haizhou Lu

Weiping Chen

XiaoQiang Li

Ning Li

Hongwei Ma

Weiwen Ye

Haibin Liu

Zhiyu Xiao

Fen Wang

Dongdong Li

Weisi Cai

Jianping Li

Xiao Yu

Sen Liu

Zhi Ding

Yao Liu

Alper Akdikmen

Franco Maloberti

Xinglong Liu

Songzhan Feng

Guichun Ban

Linsen Shi

Limei Kang

Jie Yin

Yanguo Qin

Yanjie Zhao

Xiaowei Liu

Lehua Liu

Huahua Duan

Xuan Luo

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.

NiTiHf high temperature shape memory alloy with two-way shape memory effect, and 4D printing method and application thereof

The present invention relates to a Si-containing high-strength and low-modulus medical titanium alloy, and an additive manufacturing method and use thereof. The additive manufacturing method comprises alloy ingredient design, powder preparation, model construction and substrate preheating, and additive manufacturing molding; wherein the Si-containing high-strength and low-modulus medical titanium alloy is designed in the ingredient proportion of Ti 60-70 at. %, Nb 16-24 at. %, Zr 4-14 at. %, Ta 1-8 at. %, Si 0.1-5 at. %. The principle of the present invention is design of a medical β-type titanium alloy having high-strength and low-modulus and good biocompatibility by using d-electron theory; reducing the difference of thermal expansion between the silicide and the β-Ti phase by preheating, and at the same time, ensuring that there is a sufficient degree of cooling in the additive manufacturing process to promote the transition of the alloy from the divorced eutectic reaction to the precipitation reaction, thereby solving the common problems, such as the deterioration of mechanical properties caused by the continuous distribution of the Si-containing phase along the grain boundary and the cracking caused by the difference of thermal expansion coefficient between different phases.

Si-containing high-strength and low-modulus medical titanium alloy, and additive manufacturing method and use thereof

Height-adjustable desk

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.

4D printing method for in-situ regulation of functional properties of nickel-titanium alloy and use thereof

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.

4D printing method and application of titanium-nickel shape memory alloy

A preparation method for high-strength and low-modulus β-type Si-containing titanium alloy involves: preparing an alloy component with, in atomic percentage, 60-70% of Ti, 10-20% of Nb, 5-15% of Zr, 1-10% of Ta and 1-5% of Si and using sponge titanium, sponge zirconium, a tantalum-niobium intermediate alloy and silicon as raw materials, and then uniformly smelting the alloy components to obtain a solidified ingot; then, subjecting the resulting ingot to plastic deformation with a deformation temperature of 800-900° C. and a deformation rate of 60-80%, and water-quenching same to room temperature; and finally, heating the resulting test sample to a recrystallization temperature, maintaining the temperature for 1-4 h, and carrying out an annealing treatment and air-cooling same to room temperature to obtain the high-strength and low-modulus β-type Si-containing titanium alloy. The resulting titanium alloy is more suitable for use as a medical implant material.

High-strength and low-modulus β-type Si-containing titanium alloy, preparation method therefor and use thereof

An over-current protection circuit for composite transistor devices is provided, connected between an input terminal and a load, and including: a control-terminal voltage-generation module whose output voltage varies with its input voltage when driven by a first voltage, wherein the output voltage of the control-terminal voltage-generation module serves as a control-terminal voltage; a composite transistor device, connected between the control-terminal voltage-generation module and the load, configured to conduct in response to the control-terminal voltage and a second voltage to generate an output current flowing through the load; and an over-current protection module, connected between the composite transistor device and the load, wherein when the output current of the composite transistor device exceeds a preset limit, a clamping voltage is applied to the composite transistor device by the over-current protection module to limit a current flowing through the composite transistor device, thereby limiting the output current of the composite transistor device.

Overcurrent protection circuit for composite transistor devices

Lid for food processor

Hand blender

The present invention discloses an additive manufacturing method of lead-free environmentally-friendly high-strength brass alloys, which mainly comprises five steps of gas atomization milling, model building, forming chamber preparation, pre-spreading powder and selective laser forming. Wherein the lead-free environmentally-friendly high-strength brass alloy comprises the following elements: Zn 5.5-40 wt. %, Si 0.5-4 wt. %, trace elements Al and Ti totally 0-0.5 wt. %, and Cu for the balance. Its microstructure includes micron-sized cell crystals and dendrites. By the above method, it is possible to obtain a nearly fully compact high-strength brass alloy and nearly net-formed complex parts thereof. The formed high-strength brass alloy has beautiful color and excellent physical properties such as excellent electrical conductivity, thermal conductivity, corrosion resistance and machinability. It can be widely used in sanitary ware, hardware decoration, radiators, electronic communication, low temperature piping, pressure equipment and other machinery manufacturing fields.

Additive manufacturing method of lead-free environmentally-friendly high-strength brass alloy

Electric mixer

A high-strength dual-scale structure titanium alloy, a preparation method therefor, and an application thereof, belonging to the technical field of alloy processing. The composition system of the titanium alloy is Ti&#x2014;Nb&#x2014;Cu&#x2014;Co&#x2014;Al, the atomic percentage of the various elements being 58&#x2dc;70% Ti, 9&#x2dc;16% Nb, 4&#x2dc;9% Cu, 4&#x2dc;9% Co, and 2&#x2dc;8% Al. The microstructure comprises a dual-scale coexistence of micro-crystal isometric bcc &#x3b2;-Ti and ultra-fine crystal isometric bcc &#x3b2;-Ti, and a dual-scale coexistence of micro-crystal strip fcc CoTiand ultra-fine crystal isometric fcc CoTi, or an ultra-fine crystal strip fcc CoTitwin crystal is distributed along a boundary of a dual-scale substrate, the dual-scale substrate being a nano needle-shaped martensite a' phase dispersed within micro-crystal bcc &#x3b2;-Ti. The mechanical properties of the titanium alloy are significantly improved, and the titanium alloy may be used in fields such as aerospace and aviation, weaponry and sports equipment.

High-strength dual-scale structure titanium alloy, preparation method therefor, and application thereof

The present invention relates to a lead-free easy-cutting high-strength corrosion-resistant silicon-brass alloy and the preparation method and use thereof. The mass percent composition of the alloy is: 56&#x2dc;60% Cu, 38&#x2dc;42% Zn, 0.003&#x2dc;0.01% B, 0.03&#x2dc;0.06% Ti, and 1.0&#x2dc;1.5% Si and 0.5&#x2dc;0.9% Al or 0.5&#x2dc;0.8% Si and 1&#x2dc;1.5% Al, and the zinc equivalent of all components is between 48% and 50%. In the present invention, the phase composition and the distribution state of the alloy can be regulated by controlling the contents of Si and Al elements, as well as by adding a B and Ti composite grain refiner, in order to obtain a copper alloy with the advantages of excellent comprehensive performance of strength, process ability and dezincification resistance, a high production yield, and low costs, which can replace lead brass and bismuth brass for plumbing, bathroom and a variety of corrosion-resistant parts, and has a bright prospect of popularization and application.

Lead-free easy-cutting high-strength corrosion-resistant silicon-brass alloy and the preparation method and use thereof

The present invention belongs to the technical field of the preparation of alloy materials, and discloses a high strength and toughness alloy material, a method for preparing the alloy material by semi-solid sintering, and application thereof. The preparation method comprises the three steps of mixing powders, preparing alloy powders by high-energy ball milling, and semi-solid sintering of alloy powders, the key point lies in the two-step sintering, wherein the temperature is heated to less than the initial melting temperature of the lowest-temperature melting peak of the alloy powder, under the sintering pressure conditions, and carried out a sintering densification treatment; after pressure release, the temperature is heated to the sintering temperature Ts, and maintained at the same temperature, and a semi-solid processing is carried out, with a sintering temperature Ts: Ts&#x2265;the initial melting temperature of the lowest-temperature melting peak of the alloy powder, Ts&#x2264;the initial melting temperature of the highest-temperature melting peak of the alloy powder. By using the present method, a variety of high melting point alloy systems comprising such as Ti-based, Ni-based alloy system, and the like are carried out a semi-solid processing, so as to obtain an alloy material with a novel microstructure such as nanocrystalline, ultra-fine crystalline, fine crystalline or bimodal structure, and the like, and having excellent performances, which can be widely used in the fields of aerospace, military, instruments and the like.

Alloy material with high strength and toughness and its fabrication method of semi-solid sintering

Growing community of inventors

Guangzhou, China

Chao Yang