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This invention belongs to the field of electronic component technology, and discloses a SnTe material for a nitrogen dioxide gas sensor, its preparation process, and its application. The SnTe material is synthesized via a solvothermal method. The nitrogen dioxide gas sensor mainly consists of a gas-sensitive material and gold interdigitated electrodes. The gas-sensitive material is coated on the surface of the gold interdigitated electrodes with a coating thickness of approximately 15mm to 75mm. The gas-sensitive material is SnTe. This invention provides a simple, low-cost, safe, and controllable TMDC nanomaterial preparation scheme. Using ethanolamine as a solvent and coordinating agent, and potassium hydroxide aqueous solution as a tellurium source activator, this invention synthesizes SnTe nanomaterials in one step via a solvothermal method. The SnTe nanomaterials prepared by this invention achieve a small nanoscale size. A large number of small-sized nanomaterials can effectively increase the sufficient contact between the material and gas molecules, improving the residence rate of gas molecules on the nanomaterial surface.

The application relates to the technical field of casting, and discloses a medium-frequency furnace smelting degassing and deslagging device capable of reducing the slag inclusion defects of castings, which comprises a base, a medium-frequency furnace, a first driving motor, a first cleaning mechanism, a transfer mechanism, a second cleaning mechanism, a fan, a speed reduction gear set and a powder dropping mechanism, one end of the base is rotationally connected with the medium-frequency furnace, a fan is arranged above the medium-frequency furnace, the fan is installed on the base, and the other end of the base is provided with the second cleaning mechanism. The application realizes synchronous scraping and stirring by triggering feeding through sliding travel mechanical scraping, the fan drives the first rotating frame to rotate at low speed through the speed reduction gear set, the fan can automatically switch air supply or air exhaust according to the operation stage, the requirements of accelerating the fusion of deslagging agents and smoke exhaust are realized, the triangular column transmits the power of the fan and cooperates with the fan-shaped groove to ensure that the second scraper and the first scraper are accurately positioned through self-cleaning, the whole process is automatically connected, manual intervention is not needed, and the operation strength is reduced.