7results about How to "Solve easy oxidation" patented technology

The application discloses a packaging method of a double-face bump packaging chip, which solves the defects of easy oxidation and electric leakage of the double-face bump chip, and ensures the quality and working stability of the double-face bump packaging chip. The method is characterized in that: after the wafer front surface operation is completed, the wafer front surface is reversely arranged after being bonded with glass, then the Si surface of the wafer back surface is ground and stress is released, then a SiO2 layer is formed on the surface of the Si layer, then a Ti / Cu layer is sputtered on the surface of the SiO2 layer, then the Cu is electroplated on the surface of the Ti / Cu layer to form an electroplated Cu layer, then the RDL corresponding to the pattern is formed on the wafer back surface through photoetching, then the Ti / Cu layer etching and the adhesive removing operation are carried out through photoetching, the back surface Cu manufacturing is completed, after the back surface Cu operation is completed, the wafer back surface is treated by plasma, then the RDL surface is protected by electroplating, after being reversely arranged again, the glass and the wafer are separated by UV light, and the complete single chip is formed by mechanical cutting.

This invention provides a dressing containing Ligusticum striatum microspheres and its preparation method, to solve the problem of safe and precise application of Ligusticum striatum extract or Ligustrazine in difficult-to-heal wounds; the dressing containing Ligusticum striatum microspheres and its preparation method, wherein the dressing is composed of Ligusticum striatum microspheres loaded with pHEMA hydrogel as the main body, wherein the Ligusticum striatum microspheres are formed by coating Ligusticum striatum extract or Ligustrazine with PLGA, and the pHEMA hydrogel partially encapsulates the Ligusticum striatum microspheres.

The invention relates to the technical field of copper powder preparation, and provides a preparation method of liquid-phase in-situ self-assembly nano-shell-coated micron-core composite copper powder, a specific inducer is introduced into a liquid-phase reduction system, copper sulfate is adopted as a copper salt, and sodium hypophosphite or VC is adopted as a reducing agent, so that one-time forming of a micron-core-nano-shell composite structure is realized; the problems of non-uniform particle size distribution, high energy consumption, low yield and the like in a traditional copper powder preparation method are effectively solved; according to the prepared composite copper powder, the low-temperature sintering driving force brought by the nanometer shell layer is obtained while the process-friendly characteristics of being easy to filter, easy to wash, easy to dry and the like of micron powder are reserved, the initial sintering temperature can be reduced to about 150 DEG C, and the machining performance of the copper powder under the low-temperature condition is remarkably improved.

The anti-oxidation laser processing method for the solar cell comprises the steps that a semi-finished solar cell product is moved to a processing station, and a to-be-processed surface faces upwards; at least providing a protective gas flow field on the to-be-processed surface so as to isolate the to-be-processed surface from being in contact with air; and laser penetrates through the protective gas flow field to scan the to-be-machined surface according to a preset pattern, and machining is completed. Through the method, the protective gas flow field is formed on the to-be-processed surface of the solar cell semi-finished product, a protective gas atmosphere is provided for laser processing, and the technical problem of oxidation of a processing layer or a film layer adjacent to the processing layer caused by laser processing in the prior art is solved.

The invention discloses a praseodymium target and a preparation method and application thereof, and belongs to the technical field of nuclear target preparation. The praseodymium target comprises a titanium foil substrate, a praseodymium film deposited on the titanium foil substrate and a carbon film covering the praseodymium film. The preparation method comprises the following steps: preparing a substrate: cutting a titanium foil and fixing the titanium foil on a target frame; plating a praseodymium film by vacuum evaporation: placing the target frame fixed with the titanium foil in vacuum evaporation equipment, putting a metal praseodymium evaporation material, vacuumizing, adding evaporation current for evaporation, and depositing on the titanium foil substrate to obtain the praseodymium film; the titanium foil plated with the praseodymium film is transferred into vacuum magnetron sputtering equipment, the carbon target serves as a sputtering target, vacuumizing is conducted, magnetron sputtering is conducted in the argon atmosphere, the carbon film is deposited on the surface of the praseodymium film, and then the praseodymium target is obtained. The problem that the praseodymium material is prone to oxidation is solved, the praseodymium target meeting the nuclear physics experiment requirement is obtained, and the scheme is high in operability and practicability.

The present application relates to a kind of nuclear reactor moderator elements, it includes shell and core block, wherein, core block is metal hydride moderator and is encapsulated in shell, shell is ceramic shell or metal shell and is made of sealingly connected shell and cover body.The present application also relates to the preparation method of the above-mentioned nuclear reactor moderator elements.According to the nuclear reactor moderator elements of the present application, the shell is prepared by additive manufacturing technology, and the densification of the moderator is realized by combining with heat treatment process, which solves the problems of easy oxidation and easy corrosion in the use of moderator, and meets the requirements of advanced nuclear reactor type for moderator.

The invention discloses an integrated batching system for neodymium iron boron production, and belongs to the technical field of neodymium iron boron production. The system comprises a plurality of material storage cylinders which are annularly distributed, a material mixing cylinder positioned below the material storage cylinders and a gas storage tank positioned in the center. And the gas storage tank, the material storage barrel and the material mixing barrel are connected through a pipeline to form an inert gas circulation loop. The storage barrel is of a conical barrel structure, a telescopic exhaust pipe is arranged in the center of the storage barrel, and the bottom of the storage barrel is connected with a discharging mechanism. Inert gas enters the material storage barrel from the gas storage pump to form cyclone airflow, so that the materials are effectively prevented from adhering to the wall and bridging; air flow is guided into a hollow auger shaft rod of the discharging mechanism through an exhaust pipe, finally enters the mixing barrel and returns to the air storage tank, and whole-process inert protection is achieved. The system is high in integration level, the problems of oxidation, bonding and bridging of rare earth raw materials in the storage and conveying process are solved, and the batching precision and the product purity are remarkably improved.