Chemical zog ntawm tungsten crucible
Tungsten yog ib qho tsis tshua muaj siab melting point hlau uas tuaj yeem txhim kho qhov kub thiab txias hardness ntawm hlau thiab belongs rau VI B pawg ntawm lub thib rau lub sij hawm nyob rau hauv lub periodic rooj. Tungsten yog cov hlau dawb uas zoo li hlau. Tungsten muaj lub siab melting point, lub siab vapor siab heev thiab tus nqi qis evaporation. Cov yam ntxwv ntawm tungsten yog ruaj khov heev. Nws tsis hnov mob nrog huab cua thiab dej ntawm chav tsev kub. Thaum tsis muaj cua sov, cov concentration ntawm hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid thiab aqua regia tsis cuam tshuam rau tungsten. Thaum qhov kub nce mus txog 80 degree -100 degree , ntawm ntau cov kua qaub uas tau hais los saum toj no, tshwj tsis yog hydrofluoric acid, lwm cov kua qaub muaj zog rau tungsten. Nyob rau hauv chav tsev kub, tungsten tuaj yeem yaj sai sai hauv cov kua qaub sib xyaw ntawm hydrofluoric acid thiab concentrated nitric acid, tab sis nws tsis ua haujlwm hauv cov tshuaj alkaline. Nyob rau hauv lub xub ntiag ntawm huab cua, molten alkali tuaj yeem oxidize tungsten rau hauv tungstate. Nyob rau hauv lub xub ntiag ntawm oxidants (NaNO3, NaNO2, KClO3, PbO2), cov tshuaj tiv thaiv ntawm generating tungstate yog nruj heev. Nws tuaj yeem ua ke nrog chlorine, bromine, iodine, carbon, nitrogen, sulfur, thiab lwm yam ntawm qhov kub thiab txias, tab sis tsis nrog hydrogen. Ntxiv rau cov khoom siv saum toj no, lub tuam txhab tseem muab cov tungsten rods, tungsten nplooj ntawv thiab lwm yam khoom. Peb lub tuam txhab muaj cov cuab yeej siv tswv yim thiab pab pawg ua haujlwm tshaj lij los tsim cov kev pabcuam rau koj raws li cov neeg siv kev paub. Qhov zoo tshaj plaws ntawm kev pabcuam yog peb txoj kev nrhiav tsis kawg. Vim hais tias nws yog neeg-taw qhia, nws yog trustworthy; vim nws yog kev tshaj lij thiab ua haujlwm puv sijhawm, nws tsim nyog xaiv. Cov ntaub ntawv saum toj no tsuas yog siv rau kev siv xwb. Yog xav paub meej, thov hu rau cov neeg ua haujlwm cuam tshuam los teb koj cov lus nug.
