2 results about "Temperature induced" patented technology

This invention relates to a liquid metal composite magnetic hydrogel with magnetic and thermal self-healing properties, its preparation method, and its applications. It addresses the problems of poor flexibility, weak electrical and thermal conductivity, and insufficient environmental tolerance in existing hydrogels. The method of this invention comprises the following steps: 1) preparing a liquid metal dispersion; 2) preparing a magnetic precursor system; 3) preparing a carrageenan solution; 4) magnetic field-induced orientation and thermal cross-linking curing; and 5) low-temperature induced formation of a double network. The gel material prepared by this invention exhibits thermal self-healing properties, achieving flame retardancy and self-healing even in extreme environments such as high temperatures and combustion, thereby ensuring the structural integrity and continuous stable function of the material. Simultaneously, by introducing liquid metal, the electrical and thermal conductivity of the gel system is improved, and by introducing magnetic components, it acquires magnetic control capabilities, enabling continuous use in extreme environments.

The application discloses a cold outer cylinder vacuum leak detection device and a detection method, relates to the technical field of vacuum leak detection, and provides the following scheme, which comprises a cold outer cylinder assembly, a vacuum air extraction system, a helium supply system, a detection system and a control system. The cold outer cylinder assembly comprises a cold outer cylinder body, a refrigeration unit and a temperature monitoring unit, is used for regulating the temperature in the inner cavity of the cold outer cylinder body to a preset low-temperature range and collecting the inner cavity temperature data in real time. The vacuum air extraction system comprises a mechanical forepump, a molecular pump, a low-temperature adsorption trap and a vacuum valve group which are connected in sequence and is used for extracting the inner cavity of the cold outer cylinder body and the inside of the detected part to a preset vacuum degree. The application can simulate low-temperature working conditions, accurately control the temperature and does not need refrigerant, can detect low-temperature induced micro-leakage, reflects the actual sealing performance of the detected part, the low-temperature adsorption trap and real-time calibration ensure the detection accuracy, can detect extremely tiny leakage, can flexibly adjust the air extraction rate, accurately supply helium and locate the leakage, and improves the leak detection efficiency of large equipment.