Cov Txheej Txheem ntawm Kev Tsim Cov Khoom Siv Sib Xyaws los ntawm Hlau
Cov ntaub ntawv sib xyaw ua ke ntawm cov hlau, feem ntau hu ua Metal Matrix Composites (MMC), yog cov ntaub ntawv sib xyaw ua ke uas muaj cov hlau matrix ua theem pib thiab kev txhawb nqa ua theem thib ob. Qhov kev txhawb nqa no tuaj yeem yog cov khoom siv ceramic, cov fibers, whiskers, lossis txawm tias qee cov qauv porous. Lub hom phiaj tseem ceeb ntawm kev ua cov hlau sib xyaw yog kom tau txais kev sib xyaw ua ke ntawm cov khoom uas zoo dua li cov hlau ntshiab lossis cov hlau sib xyaw ib txwm muaj, xws li lub zog siab, kev tiv thaiv kev hnav zoo, kev ruaj khov ntawm qhov kub siab, thiab qhov sib piv zoo dua ntawm lub zog rau qhov hnyav. Tsab xov xwm no tham txog cov txheej txheem ntawm kev tsim cov hlau sib xyaw, los ntawm lub tswv yim yooj yim mus rau cov theem thiab cov txheej txheem ntawm kev tsim khoom.
1. Cov Ntsiab Lus Tseem Ceeb ntawm Cov Khoom Siv Hlau Sib Xyaws
Hauv cov hlau sib xyaw, cov hlau matrix ua haujlwm ua "binder" uas hloov cov khoom thauj thiab tiv thaiv cov khoom txhawb nqa los ntawm kev puas tsuaj rau ib puag ncig. Lub caij no, cov khoom txhawb nqa txhim kho qee yam khoom, tshwj xeeb tshaj yog lub zog, kev tawv, thiab kev tiv thaiv kev hnav. Kev sib xyaw ua ke no ua rau MMCs siv dav hauv kev lag luam tsheb, aerospace, thermal electronics, thiab kev tiv thaiv.
Qee qhov kev sib xyaw ua ke hauv MMCs suav nrog txhuas txhawb nqa nrog silicon carbide (Al-SiC), magnesium nrog alumina (Mg-Al₂O₃), titanium nrog boron fiber (Ti-B), thiab qee cov hlau nrog carbon txhawb nqa hauv cov ntawv thov tshwj xeeb. Kev xaiv ntawm matrix thiab kev txhawb nqa yog qhov tseem ceeb rau txoj kev tsim qauv tsim nyog, vim tias txhua yam khoom siv muaj kev sib xws sib txawv, qhov chaw yaj, tshuaj lom neeg reactivity, thiab cov yam ntxwv ntub dej.
2. Cov Theem Dav Dav ntawm Kev Tsim Cov Hlau Sib Xyaws
Txawm hais tias cov txheej txheem sib txawv, kev tsim cov hlau sib xyaw feem ntau ua raws li cov txheej txheem dav dav no:
1. Kev xaiv cov ntaub ntawv matrix thiab cov khoom siv txhawb nqa
Txiav txim siab raws li cov khoom siv, qhov chaw ua haujlwm (corrosive, kub siab), thiab cov kev txwv ntawm kev tsim khoom.
2. Kev npaj ntawm lub amplifier
Cov khoom siv txhawb nqa tuaj yeem ntxuav, ziab, txheej, lossis ua ntej cua sov kom txhim kho kev ntub dej thiab txo cov kuab paug.
3. Kev sib xyaw thiab kev sib txuas ua ke
Cov theem txhawb nqa yuav tsum tau faib sib npaug zos hauv lub matrix. Kev faib tsis zoo yuav ua rau muaj qhov tsis muaj zog thiab tawg.
4. Kev sib sau ua ke thiab kev sib cog lus
Cov theem no lub hom phiaj yog kom txo qhov porosity, ua kom muaj kev sib txuas ntawm cov interfacial, thiab ua tiav qhov ceev ceev.
5. Kev tsim zaum kawg thiab kev kho cua sov
Cov khoom sib xyaw ua ke tuaj yeem dov, forged, extruded, lossis ua tiav ntxiv kom ua tiav cov duab tshwj xeeb thiab cov khoom siv kho tshuab.
6. Kev kuaj thiab kev tshuaj xyuas
Suav nrog rau kev ntsuam xyuas tensile, kev ntsuam xyuas hardness, kev ntsuam xyuas hnav, nrog rau kev tshuaj xyuas rau qhov tsis zoo xws li qhov hws, kab nrib pleb, lossis kev sib cais ntawm cov khoom siv reinforcement.
3. Txoj Kev Tsim Cov Hlau Sib Xyaws
Feem ntau, cov txheej txheem tsim MMC tuaj yeem muab faib ua peb pawg loj: cov txheej txheem ua kua, cov txheej txheem khov, thiab cov txheej txheem tso dej. Txhua tus muaj nws cov txiaj ntsig thiab cov teeb meem.
A. Txoj Kev Ua Kua (Kev Ua Kua)
Cov txheej txheem ua kua siv cov hlau hauv cov kua lossis ib nrab kua ua lub matrix. Lawv qhov zoo yog lawv cov nyiaj txiag piv rau kev tsim khoom loj, tab sis cov teeb meem nyob rau hauv kev faib cov khoom siv thiab cov tshuaj lom neeg muaj peev xwm ua haujlwm ntawm qhov kub siab.
1. Kev Sib Tov (Kev Sib Tov nrog Kev Sib Tov)
Qhov no yog ib txoj kev nrov rau cov khoom sib xyaw ua los ntawm txhuas vim nws yooj yim thiab pheej yig. Cov txheej txheem suav nrog:
- Cov hlau matrix yog yaj hauv lub cub tawg.
– Cov khoom siv txhawb zog (piv txwv li SiC lossis Al₂O₃ cov khoom me me) raug muab tso rau hauv cov khoom yaj.
- Cov yaj yog mechanically do kom disperse cov reinforcement.
- Cov khoom sib tov yog poured rau hauv pwm thiab txias.
Cov teeb meem tseem ceeb ntawm kev sib xyaw ua ke yog porosity, cov khoom me me sib sau ua ke, thiab tsis ntub dej. Txhawm rau kov yeej cov teeb meem no, kev ua kom cov khoom me me sov ua ntej, cov neeg sawv cev ntub dej (xws li magnesium hauv cov txheej txheem txhuas) thiab kev sib xyaw ntawm qhov ceev thiab lub sijhawm tshwj xeeb yog siv.
2. Kev nkag mus rau hauv
Txoj kev no siv cov khoom siv ua ntej (piv txwv li, cov fiber lossis cov qauv porous) uas tom qab ntawd raug infiltrated nrog cov hlau molten. Kev infiltration tuaj yeem ua tiav los ntawm lub ntiajteb txawj nqus lossis siab.
- Kev nkag mus rau hauv lub siab / Kev nkag mus rau hauv lub zog nias: cov hlau yaj raug yuam rau hauv qhov preform siv kev siab siab.
Qhov zoo yog qhov porosity tsawg thiab kev sib txuas zoo dua. Txoj kev no yog qhov tsim nyog rau kev txhawb nqa fiber ntau thiab kev siv ua haujlwm siab.
3. Kev Siv Tshuab Nias
Kev nias casting ua ke casting thiab forging. Cov hlau yaj raug nchuav rau hauv pwm thiab tom qab ntawd nias thaum nws khov. Hauv MMC, cov txheej txheem no pab:
- Txo cov qhov hws vim yog qhov ntsws,
- Ua kom ceev zuj zus,
- Txhim kho kev faib khoom txhawb nqa thaum ua ke nrog kev sib xyaw ua ke lossis preforms.
B. Txoj Kev Kho Khoom (Kev Ua Khoom Kho)
Cov txheej txheem khov kho ua cov khoom siv hauv qab qhov melting point ntawm lub matrix. Lawv cov txiaj ntsig tseem ceeb yog txo cov tshuaj lom neeg uas ua rau puas tsuaj rau qhov interface thiab tswj tau zoo dua ntawm cov qauv me me.
1. Hmoov Hlau (Hmoov Hlau)
Txoj kev no yog ib qho uas siv ntau heev rau MMCs vim nws tuaj yeem tsim kom muaj kev faib tawm ntawm cov khoom siv txhawb nqa uas sib xws. Cov kauj ruam suav nrog:
- Hmoov hlau matrix sib xyaw nrog cov hmoov reinforcing.
- Cov sib tov yog compacted ntawm high pressure.
- Sintering yog ua tiav ntawm qhov kub qis dua qhov melting point los tsim cov bonds ntawm cov khoom me me.
– Xaiv tau: cov txheej txheem ntxiv xws li kev nias kub, kev nias kub isostatic (HIP), lossis kev rho tawm raug ua kom nce qhov ceev.
Hmoov metallurgy zoo tshaj plaws rau cov khoom sib xyaw nrog cov feem pua siab thiab cov khoom me me. Cov qhov tsis zoo suav nrog tus nqi hmoov, qhov ua tau oxidation, thiab qhov txwv ntawm qhov loj ntawm cov khoom.
2. Kev Sib Txuas Lus Sib Txawv thiab Kev Nias Kub
Hauv cov khoom sib xyaw ua ke fiber, kev sib txuas diffusion tuaj yeem siv los sib xyaw cov txheej hlau thiab fiber hauv qab qhov siab thiab qhov kub tshwj xeeb rau lub sijhawm ntev, ua rau cov atoms sib kis thiab tsim cov kev sib txuas muaj zog. Kev nias kub feem ntau yog siv los tsim cov laminates lossis cov composites txheej, tshwj xeeb tshaj yog hauv cov ntawv thov kub siab.
3. Cov Txheej Txheem Hloov Kho Yas (Dov, Extrusion, Forging)
Thaum cov khoom sib xyaw ua ke lawm, feem ntau cov yas deformation yog ua rau:
- Ua kom cov khoom sib xyaw ua ke,
- Kev sib dhos cov fibers,
- Txo qhov porosity,
- Ua kom muaj zog los ntawm kev ua haujlwm tawv thiab kev kho kom zoo nkauj microstructural.
Piv txwv li, cov khoom siv txhuas uas muaj zog ua rau muaj cov khoom me me tuaj yeem raug rho tawm kom ua rau cov khoom ntom ntom thiab txhim kho cov khoom tensile.
C. Cov Txheej Txheem Tso Tawm (Cov Txheej Txheem Tso Tawm)
Cov txheej txheem tso tawm feem ntau yog siv rau kev txheej cov khoom sib xyaw lossis cov khoom tsim tshwj xeeb.
1. Tshuaj tsuag / Tshuaj tsuag
Cov hlau uas yaj lawm raug txau ua cov tee me me thiab taw rau ntawm ib lub substrate, qee zaum tib lub sijhawm nrog kev txhaj tshuaj ntawm cov khoom siv txhawb zog. Cov tee khov sai sai, tsim cov qauv me me. Qhov zoo yog kev tswj cov qauv me me, tab sis cov khoom siv nyuaj dua.
2. Kev Tso Pa Hluav Taws Xob (PVD) thiab Kev Tso Pa Hluav Taws Xob (CVD)
PVD/CVD tuaj yeem tsim cov txheej txheej nyias nyias uas tswj tau qhov tuab thiab cov khoom sib xyaw. Cov ntawv thov suav nrog cov khoom siv hluav taws xob, cov cuab yeej txiav, thiab cov txheej txheej uas tiv taus kev hnav.
3. Kev Tsim Khoom Ntxiv
Cov thev naus laus zis xws li Selective Laser Melting (SLM) lossis Directed Energy Deposition (DED) tab tom pib siv los tsim cov MMCs nrog cov qauv geometries nyuaj. Cov khoom siv txhawb nqa tuaj yeem sib xyaw rau hauv cov hmoov lossis txhaj tshuaj thaum lub sijhawm tso tawm. Cov teeb meem suav nrog kev faib tawm ntawm cov khoom siv txhawb nqa, porosity, thiab cov tshuaj tiv thaiv interfacial vim muaj zog thermal siab, tab sis lub peev xwm rau cov khoom sib xyaw ua ke uas sib dua thiab ua haujlwm tau zoo yog qhov tseem ceeb.
4. Cov Yam Tseem Ceeb Hauv Kev Tsim Cov Hlau Sib Xyaws
Kev vam meej ntawm kev tsim cov hlau sib xyaw yog txiav txim siab los ntawm ntau yam tseem ceeb:
1. Kev faib tawm ntawm cov amplifiers
Cov khoom siv txhawb zog yuav tsum tau muab faib sib npaug zos kom ntseeg tau tias muaj cov khoom siv kho tshuab zoo sib xws. Kev sib sau ua ke ua rau muaj kev ntxhov siab thiab tawg ua ntej lub sijhawm.
2. Kev sib txuas ntawm qhov sib txuas
Cov ntawv cog lus uas tsis muaj zog dhau ua rau muaj kev tawg, thaum cov tshuaj lom neeg ntau dhau tuaj yeem tsim cov theem tawg uas txo qhov tawv.
3. Qhov porosity
Qhov porosity txo qhov muaj zog thiab kev tiv taus qaug zog. Cov txheej txheem xws li squeeze casting, HIP, lossis hot extrusion feem ntau siv los txo nws.
4. Kev ntub dej thiab kev ua haujlwm
Qhov sib xws ntawm lub matrix thiab cov khoom siv hlau txhawb nqa txiav txim siab seb cov hlau yaj puas tuaj yeem ua rau cov khoom siv hlau txhawb nqa ntub tau zoo. Qee zaum yuav tsum muaj cov txheej txheem me me lossis ntxiv cov khoom sib xyaw.
5. Tswj qhov kub thiab lub sijhawm ua haujlwm
Qhov kub siab dhau tuaj yeem ua rau muaj kev sib xyaw ua ke sai dua, thaum qhov kub qis dhau tuaj yeem ua rau infiltration thiab imperfect consolidation.
5. Xaus Lus
Cov txheej txheem ntawm kev tsim cov khoom sib xyaw los ntawm cov hlau yog ib qho teb uas muab cov ntsiab cai ntawm metallurgy, cov ntaub ntawv science, thiab kev tsim khoom siv. Txij li cov txheej txheem kua xws li stir casting thiab infiltration, mus rau cov txheej txheem khov kho xws li hmoov metallurgy thiab diffusion bonding, mus rau cov txheej txheem niaj hnub xws li deposition thiab additive manufacturing, txhua tus muab cov kev daws teeb meem rau cov kev xav tau sib txawv. Cov teeb meem loj tshaj plaws feem ntau yog nyob rau hauv kev faib khoom txhawb nqa, porosity, thiab interfacial bond zoo. Nrog rau kev xaiv txoj kev zoo thiab kev tswj hwm cov txheej txheem zoo, cov hlau sib xyaw tuaj yeem muab kev txhim kho kev ua tau zoo rau ntau yam kev lag luam, tshwj xeeb tshaj yog cov uas xav tau cov khoom siv sib dua, muaj zog uas tuaj yeem tiv taus cov xwm txheej hnyav.
Yog tias koj xav tau, kuv tuaj yeem hloov kho tsab xov xwm no rau ib qho ntsiab lus tshwj xeeb (piv txwv li, cov khoom sib xyaw ua ke rau tsheb, cov khoom sib xyaw ua ke titanium rau aerospace, lossis tsom mus rau ib txoj kev ua haujlwm) thiab ntxiv cov ntaub ntawv tshawb fawb.
