6results about How to "Promote interdiffusion" patented technology

This invention discloses a SiC with an ultra-high temperature ceramic gradient coating. f / SiC composite materials, their preparation methods, and applications. A double-layer glow discharge plasma surface metallurgical method is used to prepare SiC composite materials. f A (Hf,Si,Ta)C gradient composite coating was prepared on the surface of the SiC composite material. This coating was able to resist SiC in an oxygen atmosphere at 1773 K. f Effective protection of SiC composite materials. The specific advantages of this invention are: (1) Ion bombardment of the substrate significantly improves the point defects and conductivity of the composite substrate; (2) The (Hf,Si,Ta)C coating has a continuous gradient structure, forming a good metallurgical bond between the coating and the substrate, with high bonding strength; (3) The similar thermal expansion coefficients of the (Hf,Si,Ta)C coating and the substrate can improve the thermal mismatch between the coating and the substrate, reducing the tendency for coating peeling and cracking during service; (4) The (Hf,Si,Ta)C coating system has a high service temperature and self-healing ability. The coating prepared by this invention has excellent high-temperature protection performance, improving the protection of SiC. f The high-temperature service life of SiC composite materials has broad application prospects in the aerospace field.

The present application relates to the technical field of low-temperature negative electrode material preparation of lithium ion batteries, and particularly relates to a silicon-silver-indium ternary alloy thin film negative electrode material for lithium ion batteries and a preparation method thereof, the material comprises 40 at% to 99 at% of silicon, 0.1 at% to 30 at% of silver and 0.1 at% to 30 at% of indium in terms of atomic percentage. The preparation method comprises a melting metallurgy rolling process or a magnetron sputtering deposition process. In the ternary alloy system, the silver improves the electronic conductivity, the indium optimizes the lithium ion diffusion kinetics and the interface stability, and the synergistic effect of the two makes the material exhibit high capacity, high initial efficiency and good rate performance at normal temperature and low temperature. The material system has good compatibility with the above two differentiated preparation processes, and provides a solution for the large-scale and precision application of high-performance silicon-based thin film negative electrodes.

The application relates to the technical field of corrosion-resistant alloy coating, in particular to a low-heat semi-solid surfacing process and application thereof, which comprises the following steps: using a plasma transferred arc surfacing gun with a double-gas channel, one channel is used for spraying low-heat semi-solid surfacing coating material, and the low-heat semi-solid surfacing coating material is heated to 6800-7800 DEG C through an ion source and is sprayed to the surface of a base material in a state of being protected by inert gas, and is scattered on the surface of the base material at an incident angle of 60-75 DEG; meanwhile, the other gas channel of the plasma transferred arc surfacing gun sprays alloy pellets to perform surfacing shot blasting, and a high-dense, continuous and uniform surfacing layer is formed on the surface of the base material; the low-heat semi-solid surfacing process has the advantages that the high-temperature corrosion resistance of the surface coating of important equipment such as thermal power, nuclear power, ocean, national defense and military industry can be improved.

The invention provides a dynamic rolling compensation sintering method for preparing an expanded polytetrafluoroethylene plate, which comprises the following steps: coating a biaxially oriented polytetrafluoroethylene film on a steel roller from an unreeling machine, and controlling the rotating speed of the steel roller and the advancing speed of the film on the unreeling machine, so that the expanded polytetrafluoroethylene film has a certain tension force; therefore, the steel roller is tightly coated with the thin film, and the thin film layers are tightly attached to each other. After wrapping is finished, the steel roller coated with the polytetrafluoroethylene film is put into a sintering furnace to be sintered, during sintering, the expanded polytetrafluoroethylene film is continuously rolled through a pressure roller above the steel roller, parameters such as the thickness and the surface density of the expanded polytetrafluoroethylene film are corrected in real time, and the expanded polytetrafluoroethylene film is obtained. Therefore, the consistency of the performance indexes of the expanded polytetrafluoroethylene plate is realized. The expanded polytetrafluoroethylene plate or strip produced by the method is simple in process requirement and high in production efficiency.

The application discloses a preparation method of a high-temperature alloy, which comprises the following steps: (1) mixing high-temperature alloy raw material powder with a granulating agent to perform granulation to obtain granulated raw material; and (2) under vacuum conditions, the granulated raw material is sintered by using oscillation hot pressing, and during sintering, an alternating load is adopted to control the grain growth process, so that the high-temperature alloy is obtained. The preparation method of the high-temperature alloy first performs granulation on alloy powder, and then controls the grain growth process of the product by controlling the alternating load of the oscillation hot sintering process, so that the grain refinement is facilitated, the fine-grain strengthening effect is generated, and the mechanical properties of the high-temperature alloy product are greatly improved. In addition, through the mutual synergistic effect of the granulation and the alternating load, the compactness of the product can be improved.

This invention discloses an integrated method for interfacial metallurgical bonding and temperature-controlled rolling of composite steel pipes. The method includes composite billet pretreatment, pre-placement of a Ni-Cu-Ti composite alloy gradient transition metallurgical induction layer at the interface, billet pre-clamping and positioning, gradient temperature-controlled preheating, interfacial self-induction metallurgical bonding, synchronous temperature-controlled rolling, interfacial metallurgical strengthening rolling, gradient cooling shaping, and finished product inspection and finishing. This invention achieves atomic-level fusion of the interface through the synergistic effect of the induction layer and self-induction metallurgical bonding. It simultaneously strengthens the interface and calibrates dimensions through fluctuating rolling force, solving the pain points of poor interfacial bonding and process disconnect in existing technologies. Unexpectedly, it achieves effects such as self-release of interfacial stress and improved billet toughness, thereby enhancing the quality and service stability of composite steel pipes and adapting them to harsh working conditions.