3results about How to "No protection" patented technology

A method for repairing crack defects in aluminum alloy specimens using a pointed thin-film acoustic electrode, belonging to the field of aluminum alloy specimen repair, includes: (1) determining the crack repair requirements based on the service environment of the aluminum alloy specimen, and determining the required solder according to the repair requirements; (2) ultrasonically cleaning the inside of the crack; (3) ultrasonically repairing the crack to be repaired; first, the specimen is placed on a heating platform for heating. After heating to the specified temperature, the solder is placed inside the crack. After the solder is completely melted, the pointed thin-film acoustic electrode is inserted into the solder, and the ultrasonic treatment is turned on for repair; (4) after the repair is completed, the microstructure and properties of the weld are tested. This repair method is highly operable. The repair process under ultrasonic action can be carried out directly in an atmospheric environment without the need for protective gas or special environment, reducing repair costs and adapting to various complex shapes, small widths, and large depths of cracks.

The application discloses a kind of synthesis 13 The application discloses a method for synthesizing C-labeled 4-trifluoromethyl aryl formate and application thereof.The method has mild reaction conditions and simple preparation process.Further, the method uses aryl iodide, epoxide or aziridine as raw materials, and reacts with 13 C-labeled 4-trifluoromethyl aryl formate is used as a starting material, and under the action of a palladium catalyst, a phosphine ligand, a norbornene derivative, a base and an additive, a series of C-labeled isochromane ketone compounds and dihydroisoquinoline ketone compounds can be synthesized by stirring at 60 DEG C in an organic solvent. 13 C-labeled isochromane ketone compounds and dihydroisoquinoline ketone compounds have important theoretical value and application potential.

The invention discloses an iodinated flavone derivative electrochemical synthesis method, which comprises: adding a flavone derivative, potassium iodide and a solvent into an unseparated electrolytic bath, using a graphite rod as an anode and a platinum sheet as a cathode, stirring under the current condition of 10 milliamperes, and separating and purifying a reaction crude product to obtain the iodinated flavone derivative. The invention develops an electrochemical C-H iodination reaction of potassium iodide and flavone derivatives, a series of functionalized iodinated flavone derivatives can be constructed through simple operation, and compared with the traditional synthesis method, the method has the main advantages that: 1) the reaction condition is mild, and the reaction can be smoothly carried out at room temperature; the method has the advantages of simple operation, no need of nitrogen protection, no use of a chemical oxidant due to the fact that an electric oxidation method is used in the reaction, good tolerance of functional groups, high yield and short reaction time.