Tungsten Crucible
Nws yog tsim los ntawm tig tungsten rods (feem ntau me me nyob rau hauv loj) thiab welded rau hauv ntau yam duab. Nws yog ua los ntawm [2] ntshiab tungsten daim hlau, tungsten nplooj thiab ntshiab tungsten rods ua tiav los ntawm cov txheej txheem sib thooj. Tungsten crucible tuaj yeem siv rau hauv lub tshuab nqus tsev inert gas hauv qab 2600 degrees. Tungsten muaj lub siab melting point thiab boiling point, zoo-kub lub zog, hnav tsis kam thiab corrosion kuj, siab thermal conductivity, me me thermal expansion coefficient, thiab zoo hardenability. Tungsten crucibles yog dav siv nyob rau hauv tsawg lub ntiaj teb smelting, quartz iav, hluav taws xob txau, siv lead ua loj hlob thiab lwm yam lag luam.
tungsten carbide crucible
Tungsten crucible tshuaj muaj zog;
Tungsten yog ib qho tsis tshua muaj siab melting point hlau uas tuaj yeem txhim kho qhov kub-kub hardness ntawm hlau. Nws belongs rau pab pawg VIB nyob rau hauv lub thib rau lub sij hawm (lub sij hawm ntev tshaj plaws) ntawm lub sij hawm ntawm lub ntsiab lus. Tungsten yog cov hlau dawb-dawb uas zoo li hlau. Tungsten muaj qhov siab melting point, tsawg vapor siab, thiab tsawg evaporation tus nqi. Cov yam ntxwv ntawm tungsten yog ruaj khov heev. Nws tsis hnov mob nrog huab cua thiab dej ntawm chav tsev kub. Yog tsis muaj cua sov, ib qho concentration ntawm hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid thiab aqua regia tsis cuam tshuam rau tungsten.
Tungsten Crucible Nqe
Thaum qhov kub nce mus txog 80 degree -100 Thaum degree , ntawm ntau cov kua qaub uas tau hais los saum toj no, tshwj tsis yog hydrofluoric acid, lwm cov kua qaub muaj qhov tsis muaj zog ntawm 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 tsim tungstate yog nruj dua. Nws tuaj yeem ua ke nrog cov tshuaj chlorine, bromine, iodine, carbon, nitrogen, sulfur, thiab lwm yam ntawm qhov kub thiab txias, tab sis tsis nrog hydrogen.
