Cov txheej txheem khiav ntawm kev npaj tungsten tooj liab alloy los ntawm hmoov metallurgy txoj kev yog raws li nram no: hmoov milling - sib tov ntawm cov khoom xyaw - nias thiab sib sau - sintering thiab infiltration - txias ua.
Tom qab compression molding, tungsten tooj liab los yog molybdenum tooj liab sib xyaw hmoov yog sintered nyob rau hauv cov kua theem ntawm 1300-1500 degree C. Cov khoom npaj los ntawm txoj kev no muaj tsis zoo uniformity, ntau kaw voids, thiab qhov ceev yog feem ntau tsawg tshaj li 98%. Txawm li cas los xij, kev ua haujlwm sintering tuaj yeem txhim kho tau los ntawm kev ntxiv me me ntawm npib tsib xee rau txoj kev ua haujlwm sintering, cov txheej txheem kev siv tshuab, lossis oxide txo txoj hauv kev los npaj cov hmoov ultra-nplua thiab nano hmoov, yog li txhim kho qhov ntom ntawm tungsten tooj liab thiab molybdenum tooj liab alloys. Txawm li cas los xij, npib tsib xee activation sintering yuav txo qhov conductivity thiab thermal conductivity ntawm cov khoom, thiab cov kev taw qhia ntawm impurities nyob rau hauv mechanical alloying yuav txo tau cov conductivity ntawm cov khoom; Kev npaj cov hmoov los ntawm oxide co txo txoj kev yog qhov nyuaj, tsis muaj txiaj ntsig, thiab nyuaj rau cov khoom loj.
Txoj kev txhaj tshuaj molding
High density tungsten alloy yog tsim los ntawm kev txhaj tshuaj molding. Cov txheej txheem tsim khoom suav nrog kev sib xyaw cov hmoov nickel, tooj liab tungsten hmoov, lossis hmoov hlau nrog cov khoom sib xws ntawm {{0}}} microns, tungsten hmoov nrog qhov loj me ntawm 0.5-2 microns, thiab tungsten hmoov nrog particle loj ntawm 5-15 microns. Tom qab ntawd, 25% -30% organic bonding agent (xws li paraffin lossis poly (methyl methacrylate)) yog tov thiab txhaj rau hauv pwm. Cov nplaum yog muab tshem tawm los ntawm chav ntxuav thiab irradiation, thiab sintered nyob rau hauv hydrogen gas kom tau high-density tungsten alloy.
Copper oxide hmoov txoj kev
Copper oxide hmoov (sib tov thiab hauv av kom txo tau tooj liab) yog siv es tsis txhob hlau tooj liab hmoov. Copper tsim ib tug nruam matrix nyob rau hauv lub sintered compact, thaum tungsten ua hauj lwm raws li ib tug reinforcing moj khaum. Lub siab expansion tivthaiv yog txwv los ntawm qhov thib ob tivthaiv nyob ib ncig ntawm nws, thiab cov hmoov yog sintered nyob rau hauv ntub hydrogen roj nyob rau hauv qis kub. Raws li cov lus qhia, siv cov hmoov zoo heev tuaj yeem txhim kho kev ua haujlwm sintering thiab densification, ua tiav ntau dua 99%.
Tungsten thiab molybdenum skeleton infiltration method
Ua ntej, nias tungsten los yog molybdenum hmoov rau hauv cov duab thiab sinter nws mus rau hauv ib tug tungsten los yog molybdenum skeleton nrog ib tug tej yam porosity, thiab ces yaj infiltrate tooj liab. Txoj kev no siv tau rau tungsten tooj liab thiab molybdenum tooj liab cov khoom uas tsis tshua muaj tooj liab. Piv nrog rau tungsten tooj liab, molybdenum tooj liab muaj qhov zoo ntawm cov khoom me me, kev ua haujlwm yooj yim, thiab sib piv linear expansion coefficient, thermal conductivity, thiab qee yam khoom siv loj.
Txawm hais tias nws qhov kev tiv thaiv tshav kub tsis zoo li tungsten tooj liab, nws yog qhov zoo dua li qee cov ntaub ntawv kub-resistant, yog li nws daim ntawv thov kev cia siab. Vim tias qhov dej tsis zoo ntawm molybdenum tooj liab piv rau tungsten tooj liab, tshwj xeeb tshaj yog thaum npaj molybdenum tooj liab nrog cov ntsiab lus tooj liab tsawg, qhov ntom ntawm cov khoom tom qab infiltration yog tsawg, ua rau tsis txaus airtightness, conductivity, thiab thermal conductivity ntawm cov khoom, uas txwv nws. daim ntawv thov.
