Cerium Tungsten Electrode Production Process

A plastic and metal powder produced by the method for processing a certain amount of the tungsten oxide of cerium (≤ 4%) of the electrode material . Cerium tungsten electrode material is a non-radioactive electrode material , it is since the 1950s to replace the radioactive thorium tungsten electrode material and gradually developed . This electrode material in an inert gas shielded arc welding and plasma welding , cutting, etc. has been widely applied .

Thorium tungsten electrode is used to start the early 1950s , it was added in tungsten ≤ 3% of thorium oxide . This material has a high electron emission capability , resistance to burning and arcing good performance ; However, because thorium is radioactive elements in the production, storage and use of the process prone to radioactive pollution, endangering human health , and thus from the mid-1950s , people have carried out research work on behalf of thorium materials . In 1956, the United States Lewis (A.Louis) conducted directly in the metal tungsten powder, 0.5 to 3.0% cerium oxide powder of testing, and then compacts melt down , rotary forging of welding electrodes . Two years later he cerium oxide content is reduced to 0.01% to 0.30% , so that the processing performance is improved. U.S. 1965 Herman (J.Hermann) using fine tungsten powder pressed into a pure green , green , or after this billet burn- soaked in a solution of rare earth salt , to achieve doping by imbibition , followed by sintering, according to the conventional method swaged to the desired diameter . 1967 ROMON Ivanov (V.N.Romonov) developed a 1% cerium oxide containing cerium tungsten material , the preparation process is: under 800 ~ 850 ℃ calcined ammonium paratungstate, tungsten trioxide , and the cerium nitrate an aqueous solution of a salt or oxide incorporated in the suspension of tungsten trioxide , tungsten trioxide and then doped with hydrogen good a reduced tungsten powder . Ethanol and glycerol mixture after a pressure of 600MPa into a 9mm × 9mm × 400mm billet bar , after burn-in and vertical melt , the billet of CeO2 content of 0.87% , when the swaging process , the heating temperature for the 1475 ~ 1500 ℃.


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