Kev Paub Txog Kev Lag Luam Copper: Cov Txheej Txheem Ntau Lawm ntawm Tungsten-Copper Alloy
Kev tsim cov txheej txheem ntawm tungsten tooj liab alloy:
1. Tungsten tooj liab yaj infiltration txoj kev
Txoj kev melting infiltration yog nias tungsten hmoov rau hauv ib lub billet, pre-sinter ntawm qhov kub thiab txias los npaj cov pob txha pob txha tungsten matrix nrog ib qho ntom ntom thiab lub zog, thiab tom qab ntawd yaj cov hlau tooj liab nrog qis melting point thiab infiltrate mus rau hauv lub cev. tungsten skeleton kom tau txais cov khoom siv tungsten tooj liab denser. Nws cov txheej txheem feem ntau yog tias thaum cov hlau ua kua theem ntub cov ntxeem tau matrix, cov kua hlau ntws los ntawm qhov sib txawv ntawm qhov kev txiav txim ntawm capillary quab yuam los sau cov pores ntawm cov pob txha tungsten ntxeem tau, yog li tau txais cov khoom siv denser. Txoj kev no tuaj yeem txhim kho qhov toughness ntawm tungsten tooj liab cov ntaub ntawv. Lub high-density tungsten tooj liab composite cov ntaub ntawv npaj los ntawm cov yaj infiltration txoj kev muaj zoo thermal thiab hluav taws xob conductivity, tab sis nws yog ib qho nyuaj rau lub tungsten skeleton ua rau tag nrho cov pores txuas thiab zoo ib yam nyob rau hauv loj, thiab nws kuj yog ib qho nyuaj los xyuas kom meej lub uniformity ntawm lub cev. tooj liab faib nyob rau hauv cov khoom tom qab yaj infiltration, uas yog khi rau cov khoom siv. Nrog rau txoj kev loj hlob ntawm cov hmoov plasticization nyob ze-net txoj kev siv tshuab thiab cov kev xav tau ntawm niaj hnub science thiab technology rau cov complexity ntawm qhov chaw thiab cov khoom, kev npaj ntawm tungsten skeletons tau tsim los ntawm ib tug tsoos hmoov metallurgy tuag txoj kev rau extrusion txoj kev thiab txhaj tshuaj. Piv txwv li, RM German thiab lwm tus hauv Tebchaws Meskas tau siv cov tshuab txhaj tshuaj molding los npaj cov pob txha tungsten thiab ua tiav cov txiaj ntsig zoo. Lawv pre-sintered lub pre-npaj tungsten skeleton ntawm 900 degree thiab yaj-infiltrated ntawm 1500 degree rau 90 ~ 120min. Cov alloy tau txais tau zoo heev. Txij li thaum tungsten-tooj liab sib xyaw cov khoom npaj los ntawm txoj kev no muaj kev ua tau zoo, nws yog qhov siv dav tshaj plaws. Txawm li cas los xij, txoj kev no tseem muaj qhov tsis txaus ntseeg, tshwj xeeb tshaj yog tshwm sim hauv kev xav tau ntawm kev siv tshuab tom qab infiltration kom tshem tawm cov hlau ntau dhau, uas ua rau tus nqi ntawm kev ua haujlwm tom ntej, txo cov nqi tawm los, thiab tsis tsim nyog siv rau hauv qhov chaw nrog cov duab nyuaj. .
2. High-kub kua theem sintering ntawm tungsten tooj liab
High-temperature kua theem sintering yog txheej txheem txheej txheem rau kev npaj tungsten-tooj liab cov ntaub ntawv los ntawm kev sib xyaw tungsten hmoov thiab tooj liab hmoov nyob rau hauv ib qho kev faib ua feem, nias, thiab kua theem sintering. Cov txheej txheem ib txwm ua haujlwm kub-kub ua kua theem sintering ntawm qhov kub siab tshaj 300 degree saum toj no lub melting point ntawm tooj liab kom nws ntom. Cov yam ntxwv yog tias cov txheej txheem ntau lawm yog qhov yooj yim, tab sis muaj qhov tsis zoo xws li kub kub sintering, lub sij hawm ntev sintering, ntau ntawm tooj liab volatilization, tsis zoo sintering kev ua tau zoo, thiab tsawg sintering ceev (tsuas yog 90 ~ 95 ntawm theoretical ntom), uas. tsis tuaj yeem ua tau raws li qhov yuav tsum tau siv. Yog li ntawd, txhawm rau txhim kho qhov ntom ntawm cov khoom, cov txheej txheem tom qab ua tiav xws li rov nias, kub nias, kub calcining, thiab lwm yam yuav tsum tau ntxiv tom qab ua kua theem sintering, tab sis qhov no ua rau cov txheej txheem nyuaj thiab txwv. nws daim ntawv thov. Cov khoom siv tungsten tooj liab npaj los ntawm txoj kev tawg tawg los ntawm AKBhalla18 li al. muaj qhov zoo kub-kub kua theem sintering nyhuv. Tsis tas li ntawd, nws tau pom nyob rau hauv high-temperature kua theem sintering txheej txheem uas qhov luaj li cas ntawm tungsten thiab tooj liab hmoov kuj cuam tshuam rau sintering ceev ntawm tungsten tooj liab composites. Cov hmoov zoo dua, qhov siab dua qhov sintering ceev tau txais.
3. Ultrafine / nano-loj tungsten tooj liab hmoov thiab ib-kauj ruam sintering ze-tag nrho densification txoj kev
Ultrafine / nano hmoov muaj cov yam ntxwv zoo heev: xws li cov hmoov nplej zoo, thaj chaw loj tshwj xeeb, kev sib cuag loj ntawm cov hmoov, kev ua haujlwm loj hauv av, loj sintering tsav quab yuam, qis sintering kub, ceev ceev, ceev ceev thiab kev ua tau zoo yam tsis muaj ntxiv cov activator. Yog li ntawd, lub tungsten-tooj liab cov khoom siv npaj nrog ultrafine thiab unfarational thiab unfararable zoo heev rau cov khoom siv npaj los ntawm cov hau kev. Muaj ntau txoj hauv kev los npaj cov hmoov nplej ultrafine / nano tungsten-tooj liab, xws li mechanical alloying (MA), sol-gel method (Sol-Ge1), mechanical-thermochemical process synthesis method (Mechano-Thermochemical Process), thiab lwm yam.
4. Tungsten-tooj liab activated kua theem sintering
Activated kua theem sintering yog ib txoj hauv kev ntxiv cov lej nyiaj ({{{0}}}}1-0.5) ntawm cov hlau thib peb xws li Pd, Ni, Co, Fe, thiab lwm yam. Cov khoom siv tungsten-tooj liab los txhawb cov theem tungsten uas tsis muaj nyob hauv tooj liab kom yaj nyob rau theem tooj liab, thiab tsim ib qho 7-theem uas muaj cov hlau no thaum lub sij hawm ua kua theem sintering. Piv nrog rau cov high-temperature kua theem sintering txoj kev, txoj kev no tsis tsuas yog txo cov sintering kub thiab shortens lub sij hawm sintering, tab sis kuj zoo heev txhim kho cov sintering ceev. JL Johnsonl1 et al. tau kawm txog kev ua kom muaj zog ntawm kev hloov pauv Pd, Ni, Co, thiab Fe ntawm sintering ntawm tungsten tooj liab cov ntaub ntawv. Txoj kev tshawb no qhia tias Co thiab Fe muaj qhov ua kom zoo tshaj plaws, uas tuaj yeem txhim kho qhov ntom ntom ntawm tungsten tooj liab cov ntaub ntawv. Kev ua kom muaj zog ntawm Ni thiab Pd hauv W-Cu tsis pom tseeb, uas yog qhov phem dua li cov hmoov tungsten ntshiab. Yog vim li cas yog Ni, Pd thiab Cu tsim ib qho kev daws teeb meem tsis kawg thiab tsis tuaj yeem ua kom muaj txiaj ntsig, thaum Co, Fe thiab Cu tsuas yog tsim cov kev daws teeb meem tsawg. Thaum lub sij hawm sintering txheej txheem, lub thib ob theem tsim los ntawm kab kawm yuav precipitate ntawm grain ciam teb thiab tsim intermetallic tebchaw, uas txhawb lub densification ntawm tungsten. JL Johnson thiab RMGerman li al. txoj kev kawm ntawm W-lOCu system kuj tau qhia tias thaum Co cov ntsiab lus yog 0.35, cov khoom siv tom qab sintering ntawm 1300 degree rau 1h yog qhov zoo heev. Kev ua kom muaj zog ua kua theem sintering tuaj yeem ua rau cov khoom siv tungsten tooj liab kom tau txais cov txheeb ze siab dua, hardness, khoov lub zog thiab lwm yam khoom. Txawm li cas los xij, nws tsim nyog sau cia tias qhov sib ntxiv ntawm cov activators yuav cuam tshuam rau hluav taws xob thiab thermal conductivity ntawm high-conductivity theem tooj liab, yog li txo cov thermal thiab hluav taws xob conductivity ntawm cov khoom, uas yog tsis zoo rau microelectronic cov ntaub ntawv uas yuav tsum tau muaj hluav taws xob thiab thermal conductivity. . Yog li, cov ntaub ntawv npaj los ntawm txoj kev no tsuas yog tsim nyog rau lub sijhawm uas tsis tas yuav tsum muaj hluav taws xob thiab thermal conductivity.
Txhua tus paub txog qib ntawm tungsten tooj liab alloys. Cia peb tham txog cov txheej txheem kev txheeb xyuas ntawm tungsten tooj liab alloys: Yog tias koj paub cov ntsiab lus ntawm tungsten tooj liab, koj tuaj yeem suav nws raws li qhov ceev, uas yog ib qho kev qhia ntxhib. Kev txheeb xyuas qhov tseeb tshaj plaws yog ua X-ray diffraction tsom xam, uas tuaj yeem pom tseeb cov ntsiab lus muaj nyob hauv cov khoom.
