Tungsten yog cov hlau tsis-ferrous thiab cov hlau tseem ceeb. Tungsten ore tau hu ua "lub pob zeb hnyav" nyob rau hauv ancient sij hawm. Cov ntsiab lus ntawm tungsten nyob rau hauv lub ntiaj teb crust yog 0.001 feem pua . Muaj 20 hom tungsten bearing minerals pom. Tungsten deposits feem ntau yog tsim nrog cov kev ua ntawm granite magma. Tom qab smelting, tungsten yog silvery dawb thiab ci hlau nrog siab melting point thiab zoo hardness. Atomic tooj 74. Hlau grey los yog nyiaj dawb, siab hardness, siab melting point, tsis muaj huab cua yaig ntawm chav tsev kub; Lub hom phiaj tseem ceeb yog tsim cov filament, high-speed txiav alloy steel thiab superhard pwm. Nws kuj yog siv rau hauv cov cuab yeej kho qhov muag thiab cov cuab yeej tshuaj lom neeg [tungsten; wolfram] - cov filament kos los ntawm lub cim cim W. tungsten pas nrig, uas tuaj yeem siv los ua cov hlua hauv cov qij hluav taws xob, cov raj hluav taws xob thiab lwm yam.
| Cov khoom npe | Tungsten pas nrig |
| Qib | W1 |
| Tus txheej txheem tswj hwm | ASTM 288 UAS |
| Purity | Ntau dua lossis sib npaug li 99.95 feem pua |
| Qhov ntom | Ntau dua lossis sib npaug li 19.3g / cm³ |
| Melting point | 3410 degree |
| Cov xwm txheej muab khoom | polished |
| Qhov ntau thiab tsawg | φ{0}}.3mm * Length |
| Cov txheej txheem ntau lawm | Sintering ----forging ---- polishing --- cov khoom tiav |
Ntshiab tungsten pas nrig muaj cov khoom tshwj xeeb, xws li qis thermal expansion, thermal conductivity, txaus tsis kam rau hluav taws xob thiab siab elastic modulus. Yog li ntawd, tungsten rods yog dav siv nyob rau hauv ntau yam teb. Xws li kev txhawb nqa kab, txhuas-hauv kab, koob tshuab luam ntawv, ntau yam electrodes thiab quartz rauv, filament, high-speed cov cuab yeej, automotive tsis siv neeg cov khoom, sputtering phiaj
Rolling rods: Tsaus xim av, saum npoo yog du thiab ncaj, tsis muaj qhov tsis xws luag (crackle, hnyav tawv nqaij, qhov, trough, thiab lwm yam);
tungsten rods: Bright silver grey metallic luster. (txheej txheem raws li tus neeg siv daim duab, nto tiav yog siab dua)
90 feem pua wnimofe tungsten alloy (tungsten anviloy) yog ib tug supinter alloy muaj siab dua thiab siab w4 feem pua NI4 feem pua mo2fe. Nws yog 50 feem pua ntawm qhov ntom ntawm PM cov khoom thiab cov khoom siv lead ua. Nyob rau hauv txoj kev no, tungsten alloy pas nrig cov khoom muaj tsawg coefficient ntawm thermal expansion, zoo thermal conductivity thiab cov khoom zoo. Thaum qhov kub thiab txias, tungsten alloy yog cov khoom siv siab melting point thiab qis coefficient ntawm thermal expansion. Qhov sib ntxiv ntawm tungsten alloy ntsiab txhim kho machinability, toughness thiab vuam. Tsis muaj kev kho cua sov, tsis tshua muaj yaig, zoo heev kub-resistant cracking tuag, yooj yim siv, nws tau lug siv nyob rau hauv tuag casting.
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