Thorium And Thorium Tungsten Electrode

Th is a radioactive tetravalent metal element, in the form of compounds in mineral (e.g. stone monazite and thorium), usually linked together with the rare earth metal is mainly as the isotope with mass number 232, half-life of 1.39 × 10 10 years, the formation of new particles emitted α thorium 1 [thorium] - element symbols Th, Th external electronic arrangement is 6d27s2, extranuclear arrangement of 2,8,18, 32,18,10,2. Isotopes and radiation with Th-226 [30.6m], Th-227 [18.72d], Th-228 [1.91y], Th-229 [7340y], Th-230 [75400y], Th-231 [1.06d], Th-232 (discharge α [14000000000y]), Th-233 [22.3m], Th-234 [24.1d]. Density 11.7 g / cm 3. Melting point of about 1750 ℃, boiling point of about 4000 ℃. 1400 ℃ the following atoms arranged in a face-centered cubic crystal; when the heating temperature is reached, they changed the body-centered cubic crystal. Silver-white metal, long-term exposure to the atmosphere fade to gray. Relatively soft, malleable. Insoluble in acid and hydrofluoric acid, but soluble in fuming hydrochloric acid, sulfuric acid and aqua regia. Nitric acid to make thorium purification. Caustic it had no effect. High temperature with halogen, sulfur, nitrogen effect. Radioactive half-life of approximately 1.4 × 1010 years. All thorium salts showed +4. Chemically zirconium, hafnium similar.

Thorium tungsten electrode is the earliest use of rare earth tungsten electrodes, welding performance is so far the best varieties of tungsten electrodes, so the species on a global scale tungsten electrodes highest market share, but because thorium tungsten electrode grinding and polishing powder metallurgy and rolling will occur during radioactive contamination, so European countries limit the production of the varieties electrode, but because of its excellent welding performance, its use is not restricted.


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