Kev npaj ntawm titanium thiab titanium alloy hmoov metallurgy txheej txheem

Titanium hlau thiab titanium alloys ua los ntawm hmoov metallurgy. Titanium muaj tshuaj lom neeg ua haujlwm siab thiab yooj yim kis los ntawm cov pa roj thiab cov khoom siv crucible. Yog li ntawd, cov hmoov zoo titanium feem ntau yog tsim los siv cov txheej txheem centrifugal atomization hmoov nyob rau hauv kev tiv thaiv ntawm lub tshuab nqus tsev los yog high-purity inert gas. Cov khoom yog feem ntau tsim tsis muaj ib tug binder, thiab cov dawb paug yuav tsum tau sintered nyob rau hauv lub nqus tsev vacuum.

Nyob rau xyoo 1940s, kev tshawb fawb ntawm cov txheej txheem nias thiab sintering siv titanium daim txhuam cev hmoov ua raw khoom yog thawj zaug. Txawm li cas los xij, kev ua tau zoo ntawm cov khoom tsim los ntawm cov txheej txheem no tseem tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm aviation sector. Nws yog tsuas yog siv los tsim kev tiv thaiv corrosion, pom thiab lwm yam uas yuav tsum tau ua los ntawm kev lag luam chemical, lub teeb kev lag luam, metallurgy, dej hiav txwv kev loj hlob thiab lwm yam sectors. Thawj cov khoom lag luam tau txais daim ntawv thov kev lag luam yog titanium ntxeem tau cov khoom siv lim. Hauv nruab nrab -1960s, txheej txheem ntawm kev tsim cov titanium pre-alloyed hmoov los ntawm txoj kev tig electrode thiab kub isostatic pressing densification pib tsim. Cov khoom zoo li qub ntawm cov khoom tsim los ntawm cov txheej txheem no yog sib npaug rau cov khoom smelting, tab sis cov txheej txheem txiav tau txo qis, kev siv cov khoom siv tau zoo dua qub, thiab nws tau pib siv hauv kev lag luam aviation. Thaum kawg ntawm xyoo 1970, daim ntawv thov ntawm titanium hmoov metallurgy cov khoom hauv corrosion kuj thiab aviation tau tsim sai heev. Tuam Tshoj pib ua kev tshawb fawb ntawm titanium hmoov metallurgy txheej txheem thiab cov khoom nyob rau hauv thaum ntxov 1970s. Titanium hlau li qub, lub tes tsho, cov hlab ntsha thiab daim hlau, titanium-titanium carbide hnav-tiv taus cov ntaub ntawv, thiab titanium-molybdenum corrosion-resistant alloys tau tag nrho cov industrially tsim. Thaum xyoo 1970s, kev tshawb fawb tau ua tiav ntawm centrifugal atomization los tsim cov titanium alloy hmoov zoo thiab kub isostatic pressing tshuab.

1. Sodium txo daim txhuam cev titanium hmoov. Cov hmoov no muaj cov zis loj, tus nqi qis, cov hmoov zoo plasticity, thiab haum rau kev sib sau txias. Nws yog cov khoom siv tseem ceeb rau kev tsim cov khoom lag luam corrosion-resistant. Vim tias nws muaj sodium thiab chloride ions siab, nws tuaj yeem yooj yim kis cov khoom siv thaum lub sij hawm sintering thiab ua rau cov vuam ua tau zoo ntawm cov khoom.

2. Electrolytic titanium hmoov. Lub purity yog siab dua li ntawm sodium-txo daim txhuam cev titanium hmoov, tab sis lub formability ntawm electrolytic titanium hmoov yog phem dua li ntawm daim txhuam cev titanium hmoov.

3. Hydrodehydrogenated titanium hmoov. Titanium hmoov thiab nws cov hmoov hlau alloy nrog zoo zoo thiab zoo particle loj tuaj yeem tau los ntawm cov txheej txheem hydrogenation thiab dehydrogenation; Txawm li cas los xij, batch loj me me thiab tus nqi kuj tseem kim.

4. Centrifugally atomized titanium hmoov. Nyob rau xyoo 1960, American Nuclear Metal Company thawj zaug siv arc rotating electrode txoj kev los tsim titanium pre-alloyed hmoov. Cov hmoov yog spherical nyob rau hauv cov duab. Cov hmoov hlau no muaj cov purity siab, muaj pes tsawg leeg, zoo fluidity, thiab puv ntom ntom ntawm 65% ntawm tus nqi theoretical. Cov hmoov no tsuas yog tsim nyog rau kev sib sau kub, thiab qhov chaw nrog cov duab nyuaj tuaj yeem ua los ntawm kub isostatic nias. Hauv cov txheej txheem arc rotating electrode hmoov, vim ib qho ntawm cov electrodes yog tungsten pas nrig, nws yog ib qho yooj yim los tsim tungsten paug (cov ntsiab lus tungsten hauv cov hmoov nce mus txog 400ppm), uas yuav txo qhov qaug zog ntawm cov khoom. Txhawm rau tshem tawm cov pa phem tungsten, ntau yam centrifugal atomization hmoov txheej txheem xws li rotating electrodes, arc rotating crucibles, thiab electron beam rotating disks siv electron beams los yog plasma raws li qhov chaw tshav kub tau tsim. Hom hmoov no yog cov khoom siv tseem ceeb rau kev tsim titanium hmoov metallurgy aerospace qhov chaw.

1. Sintering ntawm xoob los yog tsis tshua muaj siab ua hmoov blanks. Lub porosity ntawm lub cev sintered yog 25-70%, thiab cov txheej txheem no feem ntau yog siv los tsim cov khoom titanium ntxeem tau thiab cov khoom siv.

2. Nias thiab sintering. Nias yuav ua tau mechanically lossis isostatically. Lub siab nias yog nyob nruab nrab ntawm 2000 thiab 4000kgf / cm2, thiab sintering kub yog nyob nruab nrab ntawm 1000 thiab 1400 degree. Tus txheeb ze ntom ntom ntawm lub cev sintered tuaj yeem ncav cuag 92-95%; Cov txheej txheem no yog siv los tsim cov khoom tiv thaiv corrosion, cov khoom siv dav dav lossis cov khoom siv rau kev ua haujlwm.

3. Thermoforming. Nws yog los nias cov hmoov los yog hmoov ingot thaum lub sij hawm cua sov txheej txheem. Thermal forming processes mas suav nrog kub isostatic nias, nqus kub nias, thiab lwm yam Titanium alloy hmoov uas ua los ntawm centrifugal atomization yog tsim los ntawm kub isostatic nias. Qhov ntom ntawm cov khoom tuaj yeem nyob ze rau qhov theoretical ntom ntom thiab cov khoom sib xws hauv txhua qhov kev qhia; high-performance aerospace structural qhov chaw yog tsim los ntawm kub isostatic nias. .

4. Cov hmoov dov ntawm titanium hmoov thiab hmoov dawb paug. Extrusion thiab forging ntawm blanks, thiab lwm yam. Cov txheej txheem no tuaj yeem tau txais titanium hmoov cov ntaub ntawv los yog qhov chaw uas muaj qhov ntom ntom ntom ntom thiab ua haujlwm zoo. Ntawm lawv, hmoov dov yog qhov ua tau zoo thiab kev lag luam thev naus laus zis rau kev tsim cov titanium daim hlau ntxeem tau thiab tuab titanium daim hlau.