Txog kev tshawb fawb txog tungsten tooj liab cov ntaub ntawv sib xyaw
Tungsten-tooj liab sib xyaw cov ntaub ntawv muaj hluav taws xob thiab thermal conductivity, tsis tshua muaj expansion coefficient, zoo kub-kub zog thiab arc ablation tsis kam, thiab tau dav siv nyob rau hauv hluav taws xob engineering, mechanical processing, electronics information and other fields. Daim ntawv no qhia txog cov txheej txheem ib txwm ua thiab kev npaj tshiab ntawm cov khoom siv tungsten-tooj liab, tshuaj xyuas nws cov ntawv thov hauv cov hluav taws xob hloov hluav taws xob, electrodes, microelectronics thiab tub rog kev lag luam, thiab kev cia siab rau nws cov kev npaj siv tshuab thiab kev tsim kho.
Ua ntej
Kev tshawb nrhiav thiab kev tsim cov khoom siv tungsten-tooj liab tuaj yeem taug qab mus rau xyoo 1930s. Vim nws qhov zoo voltage kuj thiab tsis kam rau hluav taws xob ablation, nws tau dav siv nyob rau hauv industrial sectors xws li high-voltage hluav taws xob hloov. Nyob rau xyoo 1960, tungsten-tooj liab sib xyaw cov ntaub ntawv maj mam pom cov ntawv thov hauv thaj chaw xws li tsis kam vuam electrodes thiab aerospace high-temperature resistant Cheebtsam. Txij thaum ntawd los, nrog kev txhim kho me ntsis ntawm kev npaj thev naus laus zis thiab kev nthuav dav ntawm daim ntawv thov kev lag luam, kev txhim kho thiab kev siv cov ntaub ntawv tungsten-tooj liab sib xyaw tau maj mam matured. Nyob rau xyoo 1990, raws li cov khoom ntim khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, lawv tau pib siv cov khoom siv hluav taws xob loj thiab cov ntawv siv hluav taws xob. Cov khoom siv hluav taws xob thiab lwm qhov chaw tau txais kev saib xyuas dav dav. Nkag mus rau lub xyoo pua 21st, tungsten-tooj liab cov ntaub ntawv tau siv rau hauv kev ua tub rog thiab cov khoom siv high-tech xws li armor-piercing mos txwv npog cov ntaub ntawv, cov khoom siv foob pob hluav taws thiab cov khoom siv [1].
Cov khoom siv tungsten-tooj liab yog tsim los ntawm tungsten nrog cov ntsiab lus siab melting, siab ceev thiab qis expansion coefficient thiab tooj liab nrog hluav taws xob thiab thermal conductivity. Nws muaj cov khoom zoo tshaj plaws ntawm ob qho tib si thiab tau siv dav hauv kev lag luam xws li hluav taws xob, khoom siv hluav taws xob, tshuab thiab aerospace [2 ~ 4], muaj cov ntawv thov dav dav hauv ntau lub teb chaws high-tech. Txawm li cas los xij, muaj qhov sib txawv loj ntawm cov ntsiab lus melting ntawm tungsten thiab tooj liab thiab lawv tsis sib haum nrog ib leeg. Qhov ntom ntawm tungsten-tooj liab sib xyaw cov ntaub ntawv npaj los ntawm hmoov metallurgy tsis siab, uas feem ntau ua rau tsis muaj hluav taws xob conductivity, thermal conductivity thiab mechanical zog ntawm cov khoom. Txhawm rau kom tsis tu ncua ua tau raws li cov cai tshiab tau muab tso rau los ntawm kev tsim kho kev lag luam, Kev npaj thev naus laus zis thiab kev tsim cov ntaub ntawv tungsten-tooj liab tau ntsib ntau txoj kev txhim kho.
1. Kev npaj technology ntawm tungsten-tooj liab composite cov ntaub ntawv
1.1 Txoj kev Infiltration
Txoj kev infiltration yog nias tungsten hmoov los yog sib tov ntawm tungsten hmoov thiab ib tug me me ntawm tooj liab hmoov rau hauv ib tug billet, thiab npaj ib tug ntxeem tau tungsten skeleton los ntawm pre-sintering ntawm ib tug tej yam kub thiab txias, thiab ces yaj lub metallic tooj liab thiab siv capillary quab yuam. kom nws ntws raws qhov khoob ntawm tungsten hais. Lub cev pob txha yog maj mam ua kom tau txais cov khoom siv tungsten-tooj liab sib xyaw [5]. Txij li thaum lub pore sib txuas thiab qhov sib xws ntawm cov pob txha pob txha tungsten yog qhov nyuaj rau kev tswj, nws yog ib qho nyuaj los xyuas kom meej qhov kev faib tawm ntawm cov tooj liab theem tom qab infiltration, thiab cov tawv nqaij uas nplua nuj tooj liab tom qab infiltration yuav tsum tau ua tiav tom qab, uas tsis tsim nyog. kev tsim cov khoom uas muaj cov duab nyuaj [ 6-8]. Txawm li cas los xij, raws li ib qho ntawm cov txheej txheem siv dav dav rau kev npaj cov khoom siv tungsten-tooj liab, cov ntaub ntawv npaj los ntawm cov txheej txheem infiltration muaj qhov zoo ntawm qhov ntom ntom, zoo sintering kev ua tau zoo, thiab zoo tagnrho hluav taws xob thiab thermal conductivity.
1. 2 High kub kua theem sintering txoj kev
Txoj kev kub-kub ua kua theem sintering sib tov thiab tsim ib qho kev faib ua feem ntawm tungsten hmoov thiab tooj liab hmoov, thiab sinters lawv ntawm qhov kub siab tshaj qhov melting point ntawm tooj liab kom tau txais cov khoom siv tungsten-tooj liab. Vim yog qhov tsis zoo ntawm cov dej tsis zoo ntawm cov kua tooj liab thiab tungsten, cov txheej txheem sintering densification ntawm tungsten-tooj liab sib xyaw cov ntaub ntawv npaj siv cov txheej txheem no feem ntau yog particle rearrangement, uas cuam tshuam rau sintering ntom ntawm cov khoom kawg. Txawm li cas los xij, raws li ib qho ntawm cov txheej txheem kev npaj ib txwm muaj ntawm tungsten-tooj liab cov ntaub ntawv sib xyaw, cov txheej txheem ua kua theem sintering muaj qhov zoo ntawm cov txheej txheem tsim khoom yooj yim, kev ua haujlwm yooj yim thiab kev tswj hwm [9, 10].
1. 3 Activated kua theem sintering txoj kev
Cov txheej txheem ua kua theem sintering yog hais txog kev ntxiv cov lej ntawm Pd, Ni, Co, Fe thiab lwm yam kev ua kom muaj zog thaum lub sijhawm kub kub ua kua theem sintering txheej txheem los npaj cov khoom siv tungsten-tooj liab los txhim kho cov nyhuv sintering thiab tau txais tungsten-tooj liab sib xyaw. cov ntaub ntawv. Txij li thaum qhov sib ntxiv ntawm kev ua kom muaj zog yuav cuam tshuam rau hluav taws xob thiab thermal conductivity ntawm cov khoom mus rau qhov sib txawv, nws tsis haum rau nws daim ntawv thov hauv thermal, hluav taws xob tswj thiab lwm yam ntaub ntawv.
