4 results about "Crazing" patented technology

The invention discloses a laser welding method of a CoCrCuFeNi high-entropy alloy. The laser welding method of the CoCrCuFeNi high-entropy alloy is characterized in that an alloy plate is provided with a V-shaped groove, the surface of the welded groove alloy is ultrasonically cleaned for 30 minutes by acetone, then the groove surface is coated with TiO metal slurry for the first time, and after natural drying, the TiO metal slurry arranged on the groove in a coating mode is subjected to laser cladding; and secondary coating of the TiO metal slurry is carried out, after natural drying is carried out, laser welding is carried out, and welding is completed. The welding method can better solve the crack problem in the welding process and improve the welding quality.

The invention relates to a restorative method for ceramic cores with crack defects. The restorative method includes the steps that (1) polishing is carried out at the positions of the crack defects of the ceramic cores in the crack depth direction, the polishing depth is larger than or equal to 1/2 of the crack depth, and notch type groove structures are formed at the positions of the crack defects; and a silica solution and powder conforming ceramic core molding are adopted for mixing restorative slurry; (2) notch type grooves are cleaned; (3) the notch type grooves are cleaned with the silica solution, wherein after the silica solution in the notch type grooves are slightly dried, the restorative slurry is padded into the notch type grooves, and the padding depth is 1/3 to 1/2 of the groove depth; (4) a miniature oxyhydrogen flame gun is used for heating restorative parts of the ceramic cores, the heating temperature of the restorative parts is higher than 900 DEG C and is in the red state, and the state is kept for 3 seconds to 10 seconds; and the heated restorative parts are cooled to the room temperature; (5) the step (3) and the step (4) are repeatedly executed for restoring the remaining notch type groove parts until all notch type grooves are completed padded; and (6) abrasive paper larger than or equal to 800# is used for polishing for restoring the padding surfaces until the design requirements are met.

Disclosed herein is a thermal radiation modulation system comprising a first low emissivity layer comprising a plurality of distributed, strain-dependent cracks, the first low emissivity layer comprising a first polymer composite layer and a first mirror-like metal layer with low emissivity covering a surface of the first polymer composite layer; a first elastomer layer bonded to the first low emissivity layer opposite to the mirror-like metal layer; and optionally a first stretchable heater, the first stretchable heater is attached to the first elastomer layer opposite to the first low emissivity layer, wherein a top surface of the first low emissivity layer comprising the mirror-like metal layer has a lower emissivity relative to the first elastomer layer. Methods of making and use of the system are further described.

The invention provides a reproducible repair method for micro cracks of Nixing pottery. The method comprises the following steps: 1) grinding fly ash and SmCl3, adding water and uniformly stirring toobtain mixed slurry; 2) dipping the mixed slurry with a brush, uniformly applying to cracks of a green body of the Nixing pottery to be completely wetted, and naturally drying; continuously dipping the mixed slurry to be applied to the cracks so as to be completely wetted, naturally drying, and repeating until the cracks of the dried green body are filled; 3) leveling the green body, firing at a temperature of 1000-1100 DEG C for 15-30 minutes, and naturally cooling. According to the method disclosed by the invention, a strong Mullite network structure and the cracks are subjected to cross fixation so as to achieve an effect of repairing the cracks, many fine Mullite network structures have high strength, slippage of the crystal boundary can be blocked, and propagation of the crack can beavoided, so that secondary cracking can be effectively prevented.