4results about How to "No oxidation" patented technology

This invention discloses a method for metal hot-press bonding and its application. The method specifically includes: providing a first substrate and a second substrate, the first substrate having a first metal bonding surface and the second substrate having a second metal bonding surface; aligning the first and second substrates to bring the first and second metal bonding surfaces into contact; and performing hot-press bonding by controlling temperature and applying pressure. The hot-press bonding includes a heating and high-pressure stage, a heat-holding and low-pressure stage, and a cooling and pressure-releasing stage; the temperature of the heat-holding and low-pressure stage is the bonding temperature. This invention achieves hot-press bonding of metals in an air environment through coordinated temperature and pressure control, resulting in a well-bonded interface that is free of oxidation, dense, and pore-free.

The invention discloses a phase change reference-based coal low-temperature oxidation trace heat accurate determination method, which comprises the following steps: S1, selecting a raw coal sample, setting a temperature change interval of the raw coal sample, subsequently measuring the low-temperature oxidation heat yield of the raw coal sample in the temperature change interval, and selecting an organic phase change material according to the temperature change interval; s2, acquiring a heat flow curve of the organic phase-change material measured by a set heating program by using a micro-thermal analyzer; s3, collecting a heat flow curve of the raw coal sample with the organic phase-change material as a reference, which is measured by a set heating program, by using a micro-thermal analyzer; s4, acquiring a heat flow curve of the raw coal sample measured by a set heating program by using a micro-thermal analyzer; and S5, respectively calculating according to the temperature change interval to obtain specific heat change values Q1, Q2 and Q3, and subtracting the Q2 value from the Q1 value to obtain the actual oxidation heat release of the raw coal in the selected temperature change interval. According to the invention, the measurement precision of the heat release of low-temperature oxidation of the coal sample can be improved.

The utility model discloses a heat conduction device of a railway turnout snow melting system. The heat conduction device comprises a heat conduction plate, an insulating layer and a heat preservation layer. The heat conduction device is characterized in that graphite is used as a heat conduction plate in the heat conduction device, a mica insulation layer and a polyurethane heat preservation layer are arranged on the surface, making contact with air, outside the graphite, a metal buckle is arranged outside the heat conduction device, the heat conduction device is installed on the two sides of the sliding bed table through the metal buckle, and the heat conduction device and the sliding bed table are connected together; and the metal buckle is fixed through the hexagonal head bolt and the hexagonal head nut. The heat conduction device provided by the utility model can transfer heat which is originally lost in the air by the heating strip to the slide table, the slide plate and the switch rail, so that the heat efficiency and the snow melting efficiency of the snow melting system are improved, the use of electric energy is reduced, and resources are saved; the thermal uniformity of graphite is good, so that the strength of the sliding table is effectively prevented from being influenced by over-high temperature at a certain position; when individual heat conduction devices are damaged due to extrusion and collision, the heat conduction devices on the sides of the slide plate can be independently disassembled, the practicability is good, and maintenance is convenient.

The invention discloses a processing method for controlling carburizing and quenching deformation of a thin-wall sleeve gear, which is characterized in that the thin-wall sleeve gear is slowly cooled along with a furnace in a vacuum environment after carburizing, deformation caused by thermal stress is favorably reduced, and then a solid carburizer is adopted for boxing protection, so that no oxidation and no decarburization of parts can be ensured; the part which is expanded after being heated is quickly sleeved into the cold-state quenching mold to restrain the free shrinkage of the part, so that the quenching deformation can be effectively controlled, and the dimensional stability of the part after being quenched is ensured; after the part is cooled to the room temperature, cooling continues, heat preservation is conducted for preset time, then air cooling is conducted, residual austenite can be reduced, and the hardness and abrasion resistance of the carburized surface are improved; and finally, the thin-wall sleeve gear is subjected to air cooling after low-temperature heating and heat preservation for preset time, quenching internal stress can be reduced, and brittleness is reduced. According to the method, carburizing and quenching deformation of the thin-wall sleeve tooth is remarkably reduced, the stability of the machining size of the part is improved, the wall thickness of the part does not need to be thickened, machining deformation is reduced, and the machining quality of the part is improved.