5results about How to "No post-processing required" patented technology

The invention discloses a follow-up type external flushing liquid rotary printing electrolytic machining device and method for sheet parts, and relates to the field of electrolytic machining. Comprising a tool clamp system, a liquid outlet system, an anode workpiece, a cathode tool and a direct-current power source, the anode workpiece and the cathode tool are connected to a machine tool workbench through the tool clamp system, and the cathode tool can synchronously rotate and linearly move along with a machine tool spindle; the liquid outlet system and the machine tool spindle keep consistent linear motion, and electrolyte is sprayed between the anode workpiece and the cathode tool; the anode of the direct-current power supply is connected with the anode workpiece, and the cathode is connected with the cathode tool; the cathode tool is of a revolving body circular ring structure, and a window for insulation treatment is formed in the side wall of the cathode tool. According to the follow-up external liquid flushing rotary printing electrolytic machining method for the thin plate parts, the thinning of the anode workpiece and one-time efficient machining of the surface characteristics are completed by using a follow-up external liquid flushing mode of the cathode tool and the liquid outlet system of the circular ring-shaped rotary body through the specific movement mode of the cathode tool and the anode workpiece.

The invention provides a purification method of lithium tetrafluoroborate, and belongs to the technical field of secondary batteries. The purification method of the lithium tetrafluoroborate comprises the following steps: adding lithium salt into a lithium tetrafluoroborate solution under the protection of nitrogen, stirring and dispersing, introducing boron trifluoride gas for reaction, and purging the solution by nitrogen after the reaction is finished; and filtering out excessive lithium salt, and concentrating, filtering and drying filtrate to obtain qualified lithium tetrafluoroborate. According to the method, the free acid hydrofluoric acid is converted into the product lithium tetrafluoroborate by adding the lithium salt and the boron trifluoride, waste is turned into wealth, the process is simple, the reaction effect is good, and the method is suitable for industrial production.

The invention relates to an integrated pultrusion molding method and a preparation system for a composite material evacuation platform with vertical ribs; the method comprises the following steps: mixing phenolic resin, solvent, filler, pigment, dispersant and release agent to obtain an impregnation liquid A; mixing phenolic resin and phenolic resin curing agent to obtain an impregnation liquid B; pulling a part of fiber yarn into the impregnation liquid A for impregnation, and pulling a part of fiber yarn into the impregnation liquid B for impregnation; passing the fibers, fiber fabrics, fireproof filling blocks impregnated with the impregnation liquid A and the fibers impregnated with the impregnation liquid B through a rubber extrusion plate at the same time, removing excess glue, pulling into a high-temperature curing mold, and curing at high temperature to obtain a composite material evacuation platform with vertical ribs; wherein the fibers and fiber fabrics impregnated with the impregnation liquid A form an outer plate body, and the fibers impregnated with the impregnation liquid B are located between two adjacent fireproof filling blocks to form vertical ribs; the obtained composite material evacuation platform with vertical ribs can meet the requirements of mechanical strength and fire resistance.

This invention provides a method and apparatus for preparing controllable-size silicon carbide using a chemical vapor deposition reactor. The method includes the following steps: S1, heating the reactor to the reaction temperature; S2, introducing a mixed gas consisting of H2 and a protective gas from the bottom of the reactor, and introducing SiC particles from the top of the reactor, so that the SiC particles are suspended in the reactor and form a stable cycle of "central jetting zone - annular reflux zone"; S3, using the mixed gas as a carrier gas, introducing a precursor gas from the bottom of the reactor to carry out a pyrolysis deposition reaction, and adjusting the carrier gas flow rate in real time to ensure that the deposited SiC particles form a stable cycle; S4, stopping the reaction and cooling down, and then starting the reactor to collect the product. This method solves the problems of traditional methods, such as difficulty in balancing large particle size and high purity, difficulty in post-processing, or introduction of impurities, achieving efficient preparation of high-purity, uniform controllable-size silicon carbide particles without the need for subsequent impurity removal or crushing.

The invention relates to the field of metal material additive manufacturing, in particular to a high-strength and hydrogen embrittlement-resistant metastable high-entropy alloy and a preparation method thereof. The metastable high-entropy alloy is prepared from pre-alloyed powder prepared by an inert gas atomization method through a laser powder bed melting technology, has excellent hydrogen embrittlement resistance and high strength, and has wide application prospects in hydrogen storage system components with complex structures or hydrogen environment pipeline pieces of spacecrafts.