3 results about "Double heterostructure" patented technology

The application discloses a preparation method of a copper alloy with a double heterostructure and belongs to the technical field of material preparation. The method comprises the following steps: firstly, a copper plate and an aluminum plate are subjected to accumulative roll bonding to obtain a Cu / Al multilayer composite plate; and finally, the obtained sample is subjected to surface grinding and polishing, and surface nanocrystallization treatment is carried out at room temperature for 2 min. It is found for the first time that after the accumulative roll bonding, annealing is carried out, a hetero-layer structure is formed, and the traditional surface nanocrystallization structure is superposed, so that a double heterostructure is formed, and the double heterostructure with matched yield strength and plasticity is obtained.

The invention discloses a titanium alloy diffusion bonding joint with a double-heterostructure, and the grain size of the bonding joint is in'fine-coarse-fine 'gradient distribution in the direction from a weld interface to a matrix. The invention further discloses a preparation method and application of the titanium alloy diffusion bonding joint with the double-heterostructure. According to the method, a gradient nanocrystalline layer and a high-density dislocation structure are formed on the to-be-connected surface through the composite surface treatment process of multi-pass high-energy shot blasting and ultrasonic surface rolling, a rapid channel is provided for atomic diffusion at low temperature, high-quality diffusion connection of titanium alloy can be achieved at the low temperature of 700-800 DEG C, and the shear strength of an obtained connection joint is larger than or equal to 600 MPa; and equipment used in the technological process is conventional industrial equipment and can be directly applied to an existing production line conveniently, large-scale equipment transformation is not needed, the investment cost is low, and the implementation efficiency is high.

The invention discloses a carbon-supported molybdenum-based compound and layered double hydroxide co-modified photocatalyst and a preparation method thereof, and belongs to the technical field of hydrogen production by photocatalytic decomposition of water. According to the photocatalyst, a carbon-loaded molybdenum-based compound is a thin-wall large / mesoporous hollow nitrogen-doped carbon tube HNC-loaded Mo2C / MoO2 compound marked as Mo-C / O, and the size of the Mo2C / MoO2 compound is limited by using Mo-C / O as a cocatalyst; the layered double hydroxide is a cage-shaped NiCo-LDH (layered double hydroxide) compound, and ZnCdS is co-modified by Mo2C / MoO2 and NiCo-LDH (layered double hydroxide); the ZnCdS and the Mo2C / MoO2 form a Schottky junction, the NiCo-LDH and the ZnCdS form a type II heterojunction, and a cascade electron transmission channel is formed among the Mo2C / MoO2, the ZnCdS and the NiCo-LDH. Through the synergistic effect of the double heterostructures, the light response range can be widened, the separation efficiency of photon-generated carriers can be further enhanced, the driving force of charge migration is improved, the directed migration of electrons is promoted, the reaction kinetics is improved, and the photocatalytic hydrogen evolution performance is further improved.