30 results about "Uranium nitride" patented technology

The invention discloses a method and a device for preparing a uranium surface anti-corrosion protecting layer through atmospheric laser passivation and aims to solve the problems that workpiece sizes are limited, demands of industrial production and application are hardly met and prepared uranium nitride films are still corroded to a certain degree in terms of current uranium nitride film preparation by laser nitridation. In the atmospheric environment, the workpiece surface is scanned through nanosecond pulse laser, the laser energy density is 20-70J / cm2, the overlapping ratio is 80%-95%, and therefore a uranium nitrogen oxygen passive film in a ceramic state is prepared on the workpiece surface. A vacuum environment and a special gas source are not required; machining demands of plane workpieces, abnormal-shaped workpieces and large workpieces can be met; the machining speed is high; the demands of the industrial application can be met. Meanwhile, the prepared uranium nitrogen oxygen passive film is excellent in corrosion resistance, pre-treatment of the workpiece surface is not needed; the quantity of generated wastes is small; environment-friendly effect is achieved. By means of the method and the device for preparing the uranium surface anti-corrosion protecting layer through atmospheric laser passivation, during workpiece machining, burrs of the workpiece surface can be removed, and the method and the device have good application prospects.

The invention discloses an integrated uranium nitride thermoelectric conversion device, which includes a casing and a thermoelectric conversion device installed on the casing and having a self-heating function; the thermoelectric conversion device includes a conversion module; the conversion module includes a first conductive sheet, The N-type semiconductor, the P-type semiconductor and two second conductive sheets respectively connected to the N-type semiconductor and the P-type semiconductor; the N-type semiconductor and the P-type semiconductor have the same structure and are divided into a high fission concentration area and a low fission concentration area. The present invention selects uranium nitride as the heat source and thermoelectric conversion material at the same time, reduces the volume and weight of the conversion module, and improves the energy efficiency of the entire thermoelectric conversion device; Timely and stable release of heat energy is an ideal heat source in thermoelectric conversion devices; the integration of thermoelectric material transduction components and radioactive heat sources can effectively avoid radiation damage of thermoelectric materials and prolong the service life of thermoelectric devices.

The invention belongs to the technical field of nuclear fuel preparation, and relates to a microwave synthesis method for zirconium uranium carbonitride powder. The microwave synthesis method sequentially comprises the following steps: (1) ball-milling: weighing UO2 powder, ZrO2 powder and carbon powder, performing uniform mixing, pouring the obtained mixture into a mill pot, adding grinding balls, and performing ball milling; (2) pressing: pouring out the ball-milled material, separating the balls and the material, sieving the material, and pressing the ball-milled raw material powder in a hydraulic machine to form a green body; and (3) performing microwave calcination: placing the green body in a microwave high-temperature furnace, vacuumizing the furnace, introducing an atmosphere gas,carrying out microwave heating to 1300-1600 DEG C, and performing heat insulation calcining to obtain the zirconium uranium carbonitride powder. The synthesis method for zirconium uranium carbonitridepowder is used to directly obtain a (U,Zr)(C,N) single solid solution phase at a low reaction temperature, and the synthesized (U,Zr)(C,N) powder has a high activity, and can be directly used in thesubsequent pellet sintering process.

The invention relates to the technical field of preparation of nuclear fuel pellets, and particularly discloses to a method for preparing a uranium nitride pellet. The method comprises the following steps: 1, preparing a hydrogenation-dehydrogenation sample; 2, performing hydrogenation-dehydrogenation to prepare uranium powder; 3, preparing uranium sesquinitride powder; 4, molding a uranium sesquinitride green body; step 5, sintering the green body to form the uranium nitride pellet. The uranium nitride pellet obtained by the method has good surface appearance, and the density and the chemicalcomposition of the pellet meet the requirements of technical indexes, so the pellet can be used in a novel nuclear reactor to improve the core power density and reduce the release of fission products.