Beijing University of Technology

Hongli Suo

Lin Ma

Min Liu

Yue Zhao

Tieyong Zuo

Meiling Zhou

Yi Wang

Jing Liu

Jie Zhou

Hui Tian

Pan Wang

Yaming Li

Tiantian Wang

Dong He

Yingxiao Zhang

Yonghua Zhu

Shuai Ye

Lingji Ma

Yichen Meng

Zili Zhang

Mangmang Gao

Yaru Liang

Faxue Peng

A method for preparing element diffusion-type composite substrate and it belongs to the field of high-temperature coated superconductor substrate preparation. The rolled composite nickel-tungsten alloy substrate is heated and thermally insulated, meanwhile, both ends of the rolled substrate are applied with a low voltage and high current density pulse current. High-performance nickel-tungsten alloy composite substrate is obtained with the method in the present invention and the sandwich-like composite substrate has low ferromagnetism and high strength due to higher solute diffusion from inner layer to outer layer, yet which does not affect the formation of sharp cubic texture on the surface of the composite substrate. On the one hand, the adoption of electric pulse technology accelerates the interdiffusion effect of inter-layer elements, on the other hand, it promotes the recrystallization nucleation and reduces the recrystallization annealing temperature of the composite substrate, thus energy saving effect is achieved and the negative effects of annealing thermal erosion grooves among crystal boundary to subsequent coating are effectively reduced. Alloy composite substrate prepared in this invention has the characteristics of high cubic texture content, low magnetism, high strength, and can be applied to large-scale industrial production.

Method for preparing element diffusion-type composite substrate

A composite article that can be used as a substrate for coated conductors is disclosed. The composite substrate has at least three layers in which one or more inner layers of Ni&#x2014;W alloys with 9 at. %-13 at. % W and two outer layers of Ni&#x2014;W alloys with 3 at. %-9 at. % W. The content of W element gradually decreases from the inner layers to the outer layers. The composite substrate can be prepared using a process of designing and sintering composite ingot, rolling composite ingot and then annealing composite substrate. The composite substrate have a dominant cube texture on the outer layer of the whole substrate which have a weaker magnetism and higher strength than that of a single Ni-5 at. % W alloy substrate. the preformed composite ingot is prepared by filling and compacting the Ni&#x2014;W mixed powders into a mold layer by layer according to the structure of composite substrate; in said mold, said preformed composite ingots are with the total thickness of 5-250 mm, the thickness of two outer layers being 2/9-&#x2154; of the total thickness.

Biaxially textured composite article

A composite article that can be used as a substrate for coated conductors is disclosed. The composite substrate has at least three layers in which one or more inner layers of Ni&#x2014;W alloys with 9 at. %-13 at. % W and two outer layers of Ni&#x2014;W alloys with 3 at. %-9 at. % W. The content of W element gradually decreases from the inner layers to the outer layers. The composite substrate can be prepared using a process of designing and sintering composite ingot, rolling composite ingot and then annealing composite substrate. The composite substrate have a dominant cube texture on the outer layer of the whole substrate which have a weaker magnetism and higher strength than that of a single Ni-5 at. % W alloy substrate. the preformed composite ingot is prepared by filling and compacting the Ni&#x2014;W mixed powders into a mould layer by layer according to the structure of composite substrate; in said mould, said preformed composite ingots are with the total thickness of 5-250 mm, the thickness of two outer layers being 2/9-&#x2154; of the total thickness. The method of the present invention can obtain the composite substrate with high mechanical strength and reduced magnetization owing to the use of the Ni alloy with high W content in the inner layers of the composite substrate.

Method of preparing a biaxially textured composite article

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Hongli Suo