Alumina ceramics are ceramic materials based on alumina (Al2O3) for thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina ceramics is a versatile ceramic. Because of its superior performance, it has been widely used in modern society, satisfying the needs of daily use and special performance.The high-purity alumina ceramics have a Al2O3 content of 99.9% or more. Since the sintering temperature is as high as 1650-1990 ° C and the transmission wavelength is 1 to 6 μm, the molten glass is generally used to replace the platinum crucible; Sexual and alkali-resistant metal corrosion is used as a sodium lamp; it can be used as an integrated circuit substrate and high-frequency insulation material in the electronics industry. Alumina Ceramics,Alumina Ceramics Parts,Wear Resistant Alumina Ceramic Dongguan Haikun New Material Co., Ltd. , https://www.nitrideceramic.com
Water jet pump working process has a certain pressure of the working medium water through the nozzle to the suction chamber high-speed jet, the water pressure can be kinetic energy, the formation of high-speed jet; inhalation chamber gas is forced to carry high-speed jet mixed with it, Forming a gas-liquid mixed flow, into the diffuser, thereby reducing the pressure in the suction chamber to form a vacuum. In the expansion section of the diffuser, the kinetic energy of the mixed jet is transformed into pressure energy, the velocity decreases, the pressure is increased and the gas is further compressed, The water is discharged together with the pump, and the gas and water are separated in the water tank. The gas is released into the atmosphere, and the water is circulated and reused by the water pump to achieve the purpose of evacuating once in a while. The nozzle of a single-stage water jet pump may be a single nozzle structure formed by a tapered nozzle or a multi-nozzle structure having a plurality of orifices on one orifice plate. Operating characteristics Water jet pump working system consists of pumps, water jet pumps, piping, valves, water vapor separator and test instrumentation and other components, commonly used systems are vertical and horizontal installation of two. Domestic water jet pump exhaust volume of 5 ~ 800 m3 / h, single-stage pump ultimate vacuum up to 3 000 Pa (23 Torr) or so. Figure 7 shows the suction curve of ZSWJ water jet pump produced by Shanghai Hokaoka Vacuum Equipment Co., Ltd. The pumping capacity is 50 m3 / h, 100 m3 / h, 110 m3 / h and 130 m3 / h, respectively. In order to increase the degree of vacuum, can run in series with steam, if the use of a water jet pump with a three-stage steam jet pump to form a four-stage steam jet pump unit, the ultimate pressure of up to 20 Pa (0.15 mmHg). In order to prevent being pumped medium vacuum pump, optional anti-corrosion jet pump. Centrifugal pump can be made of reinforced polypropylene (RPP), stainless steel, fluorine alloy, glass fiber reinforced plastic; Jet pump can be made of stainless steel, cast iron inner roll of polyethylene (PE) or polychlorotrifluoroethylene steel lining ceramic nozzle Teflon Or ceramic.