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公开(公告)号：US11913105B2
公开(公告)日：2024-02-27
申请号：US17239684
申请日：2021-04-26
申请人： Zhejiang University
发明人： Jiabin Liu , Hongtao Wang , Youtong Fang , Xiaoyang Fang , Jindong Zhang , Litian Wang , Liang Meng
IPC分类号： C22F1/08 , B21C23/00 , B22D11/00 , B22D11/055 , B22D11/115 , B22D11/124 , C22C9/06 , C22C19/05
CPC分类号： C22F1/08 , B21C23/001 , B22D11/004 , B22D11/055 , B22D11/115 , B22D11/124 , C22C9/06 , C22C19/056
摘要： A high-efficiency and short-process method for preparing a high-strength and high-conductivity copper alloy is disclosed, comprising the following steps: performing horizontal continuous casting to obtain an as-cast primary billet of copper alloy, wherein the alloying elements in the obtained as-cast primary billet being in a supersaturated solid solution state; after peeling the obtained as-cast primary billet, directly performing continuous extrusion, cold working and aging annealing treatment to obtain a copper alloy, and keeping the alloying elements of the billet in a supersaturated solid solution state during the process of continuous extrusion. The method shortens the flow, reduces energy consumption and improves the product forming rate.
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公开(公告)号：US20210332467A1
公开(公告)日：2021-10-28
申请号：US17239684
申请日：2021-04-26
申请人： Zhejiang University
发明人： Jiabin Liu , Hongtao Wang , Youtong Fang , Xiaoyang Fang , Jindong Zhang , Litian Wang , Liang Meng
IPC分类号： C22F1/08 , C22C19/05 , C22C9/06 , B22D11/00 , B22D11/055 , B22D11/115 , B22D11/124 , B21C23/00
摘要： A high-efficiency and short-process method for preparing a high-strength and high-conductivity copper alloy is disclosed, comprising the following steps: performing horizontal continuous casting to obtain an as-cast primary billet of copper alloy, wherein the alloying elements in the obtained as-cast primary billet being in a supersaturated solid solution state; after peeling the obtained as-cast primary billet, directly performing continuous extrusion, cold working and aging annealing treatment to obtain a copper alloy, and keeping the alloying elements of the billet in a supersaturated solid solution state during the process of continuous extrusion. The method shortens the flow, reduces energy consumption and improves the product forming rate.
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公开(公告)号：US12040659B2
公开(公告)日：2024-07-16
申请号：US17334850
申请日：2021-05-31
申请人： Zhejiang University
发明人： Lijian Wu , Youtong Fang , Hao Yin , Ying Meng , Minchen Zhu
CPC分类号： H02K1/16 , G01R31/343 , H02K1/27 , H02K1/278
摘要： Method for evaluating electromagnetic performance of a permanent-magnet machine, wherein the method is implemented in a computer processer or in a controller of a permanent-magnet machine, calculating the magnetic field distribution by a sub-domain method; using current density of the equivalent current sheet to represent the boundary condition, iterating by the sub-do-main method and by the magnetic circuit method until a convergent result is obtained, calculating the electro-magnetic performance parameters on basis of the convergent result, so as to evaluate the electromagnetic performance.
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4.发明授权公开(公告)号：US10738372B2
公开(公告)日：2020-08-11
申请号：US15777372
申请日：2017-06-05
申请人： Zhejiang University
发明人： Hongtao Wang , Jiabin Liu , Youtong Fang
摘要： A method of processing fully austenitic stainless steels, comprising the following steps: (1) performing a solution treatment on a raw material with a certain chemical composition, and cooling to get samples, the raw material contains: 0˜0.2% of C, 0˜0.2% of N, not more than 0.03% of P, not more than 0.001% of S, 0.5%˜1% of Si, 1.0%˜2.0% of Mn, 15%˜17% of Cr, 5%˜7% of Ni by weight, the remaining is Fe, and the content of C and N should not be zero simultaneously with a total content of both at 0.15%˜0.2%; and (2) performing hot-working for deformation of the samples obtained in step (1), to get a fully austenitic stainless steel. The stainless steel prepared by the hot-working deformation of the present invention has a yield strength of 2 to 3 times of that before hot-working deformation and an elongation of 1.05 to 1.2 times of that before hot-working deformation.
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公开(公告)号：US11996786B2
公开(公告)日：2024-05-28
申请号：US17770462
申请日：2021-01-18
申请人： Zhejiang University
发明人： Wuhua Li , Ye Yan , Yuxiang Wang , Chushan Li , Wenxi Yao , Xiangning He , Youtong Fang
IPC分类号： H02M7/48 , H02M1/00 , H02M7/5387
CPC分类号： H02M7/4815 , H02M1/0009 , H02M7/53871
摘要： A resonance control method for differentiated phase correction under asymmetric positive and negative bilateral frequency domains includes a differentiated phase correction resonance control link with an independent phase correction angle at each resonance point, a decoupling link and a delay compensation link. As a high power converter has the characteristic of asymmetric positive and negative bilateral frequency domains under resonance control with decoupling, stability margin of a control link is enhanced while a negative-sequence current suppression capability is realized by means of differentiated phase correction at positive and negative resonance poles.
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公开(公告)号：US20210313848A1
公开(公告)日：2021-10-07
申请号：US17334850
申请日：2021-05-31
申请人： Zhejiang University
发明人： Lijian Wu , Youtong Fang , Hao Yin , Ying Meng , Minchen Zhu
摘要： Method for evaluating electromagnetic performance of a permanent-magnet machine, wherein the method is implemented in a computer processer or in a controller of a permanent-magnet machine, calculating the magnetic field distribution by a sub-domain method; using current density of the equivalent current sheet to represent the boundary condition, iterating by the sub-do-main method and by the magnetic circuit method until a convergent result is obtained, calculating the electro-magnetic performance parameters on basis of the convergent result, so as to evaluate the electromagnetic performance.
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公开(公告)号：US20210293732A1
公开(公告)日：2021-09-23
申请号：US17205507
申请日：2021-03-18
申请人： Zhejiang University
发明人： Jiabin Liu , Hongtao Wang , Youtong Fang , Weimian Guan
IPC分类号： G01N25/00
摘要： A method for quantitatively evaluating ablation-resistant properties of materials, comprising repairing a cathode sample, loading a sample into a test system, setting a minimum ablation time; conducting an arc ablation test on the sample for no less than the minimum ablation time, recording the arc ablation parameters; dividing the ablation volume by an ablation power to obtain an ablation loss rate, and taking the ablation loss rate as a quantitative evaluation index of ablation-resistant properties of electrode materials. The present invention is capable of quantitatively evaluating the arc ablation-resistant properties of electrode materials.
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公开(公告)号：US10801087B2
公开(公告)日：2020-10-13
申请号：US16061027
申请日：2017-05-15
申请人： Zhejiang University
发明人： Jiabin Liu , Yuqing Xu , Hongtao Wang , Youtong Fang , Liang Meng , Litian Wang , Yu Tian
摘要： The present invention discloses a super-strong high-conductivity copper alloy and applications thereof as the contact wire materials of high speed railways allowing a speed of over 400 km per hour. The copper alloy comprises niobium, chromium, zirconium, titanium and remaining copper; the copper alloy exists in the form of long bar or wire, wherein niobium is distributed in the copper matrix in the form of nanofibers and solid solution atoms, chromium is distributed around the niobium fibers and the copper matrix in the form of nano-particles and solid solution atoms, zirconium is distributed around the niobium fibers and in the copper matrix in the form of copper-zirconium compound nano-particles and solid solution atoms; titanium is distributed in the copper matrix in the form of copper-titanium GP zone and solid solution atoms; the total amount of niobium, chromium and zirconium solid solution atoms contained in the copper alloy is less than 0.2%.
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公开(公告)号：US10781508B2
公开(公告)日：2020-09-22
申请号：US15777328
申请日：2017-05-15
申请人： Zhejiang University
发明人： Jiabin Liu , Yuqing Xu , Hongtao Wang , Youtong Fang , Liang Meng , Litian Wang , Yu Tian
摘要： A high-strength and high-conductivity copper alloy and applications of the alloy as a material of a contact line of a high-speed railway allowing a speed higher than 400 kilometers per hour. The copper alloy has the following characteristics: (1) constituents of the copper alloy are in the form of CuXY, X is one or more selected from Ag, Nb and Ta, and Y is one of more selected from Cr, Zr and Si; (2) at a room temperature, the element X in the copper alloy exists in the form of a pure phase and solid solution atoms, the element Y exists in the form of a pure phase and solid solution atoms or a CuY compound and solid solution atoms, the content of the element X existing in the form of the solid solution atoms is lower than 0.5%, and the content of the element Y existing in the form of the solid solution atoms is lower than 0.1%; and (3) the copper alloy exists in the form of long strip rods or lines, the element X in the form of the pure phase is embedded in the copper alloy in the form of fibers disposed in parallel approximately, and the axial direction of the fibers is approximately in parallel with the axial direction of the copper alloy rods or lines; and the element Y existing in the copper alloy in the form of the pure phase or the CuY compound is embedded in the copper alloy in the form of particles. The copper alloy is suitable for being used as a material of a contact line of a high-speed railway allowing a speed higher than 400 kilometers per hour.
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