Tungsten-antimony thermocouples are high-temperature thermocouples. It has the advantages of good temperature-potential linearity, reliable thermal stability, and low price. With the display instrument, it can directly measure the temperature of liquid, vapor and gas media. It can partially replace the platinum-rhenium thermocouple as a high-temperature measurement tool for the high-tech metallurgical industry, high-temperature electronic thermoelectric system structural engineering and space vehicles, and nuclear reactors. Tungsten-rhenium thermocouple production process   1: pre-alloy powder preparation   According to the weight percentage of the negative electrode material and the cathode material, the negative electrode material and the positive electrode material are prepared respectively, and a high-energy dispersion method is used. The inverse speed is 80-150r/min and the dispersion time is 15-20 hours.   2: molding   Mechanical press molding, pressure 150-450Mpa, time 15-20s   3: pre-sintering   1300-1500°*3h under reducing atmosphere   4: Melting   In two sections, the first paragraph: 2000A*20min, the second paragraph: 2800-3300A*450min   5: Swaging:   Temperature 1300-1600°, pass compression ratio greater than 25%, processing size range 10%-20%   7: Cleaning   Alkaline electrolytic cleaning, alkali concentration: 15-20%, electrolytic voltage 30-100V, time 5s   8: Annealing   Finished wire annealing temperature 1200-1500°, time 30-60min   9: Finished product packaging   Vacuum packaging Tungsten-antimony thermocouple is widely used in metallurgy, coking, chemical kilns, heat treatment, glass and other industries. It has the advantages of high precision, low price, stable performance, and is not limited by the working environment atmosphere. It is ideal for replacing platinum and rhodium thermocouples. product. The tungsten-rhenium thermocouple produced by our company has been widely used in many units and its performance has reached the level of similar foreign products. Tungsten-antimony thermocouples are easily oxidized and are suitable for use in inert or dry hydrogen, or they can be isolated from oxygen by using dense protective tubes. Cannot be used in carbon-containing atmospheres (such as in hydrocarbon-containing atmospheres, and temperatures in excess of 1000°C are subject to corrosion). Tungsten or tungsten crucibles tend to generate stable carbides in a carbon-containing atmosphere, which reduces their sensitivity and causes brittle fracture, and accelerates carbonization in the presence of hydrogen.
Bearings are the groundwork for auto transmission parts. Auto Bearing, although is a small part, it has a close relationship with reliability, security and comfort of the whole vehicle.
Bearing has two main functions. One is that shock absorber can be rotation with the wheel to keep the steering flexible when the vehicle steering. Second, the outer ring of pressure bearing is rubber products, which keep the soft connection between body and shock absorber. That is to prevent vibration damper to the body when the road is tough.
Bearing Auto Bearing,Wheel Bearing,Clutch Release Bearing,Tensioner Bearing NINGBO DGOFEN AUTO TRADE CO., LTD , http://www.dgofen.com