Abstract
Pob zeb diamond / silicon carbide (Pob zeb diamond / SiC) cov khoom sib xyaw, leveraging lub ultra-siab thermal conductivity thiab ultra-siab hardness ntawm pob zeb diamond, nrog rau cov tshuaj zoo heev stability, txhua yam muaj zog, thiab thermal expansion txuam cov yam ntxwv ntawm silicon carbide, tau tshwm sim raws li ib tug tseem ceeb neeg sib tw cov ntaub ntawv rau tom ntej - tiam kev ua hauj lwm nyob rau hauv high-ceev cov txheej txheem. Daim ntawv no muab kev tshuaj xyuas zoo ntawm cov khoom siv tseem ceeb, cov txheej txheem kev tsim khoom tseem ceeb, cov xwm txheej tseem ceeb ntawm cov ntawv thov, thiab cov teeb meem tseem ceeb ntawm cov khoom sib xyaw no, txhawm rau ua cov ntaub ntawv siv rau kev tshawb fawb thiab kev ua haujlwm engineering hauv cov haujlwm muaj feem xyuam.
1. Taw qhia
Nrog txoj kev loj hlob sai ntawm thib tsib- tiam kev sib txuas lus mobile, kev txawj ntse, kev ua haujlwm siab - kev suav, thiab aerospace technologies, cov khoom siv hluav taws xob tau hloov mus rau lub zog siab dua, kev sib koom ua ke ntau dua, thiab cov qauv me me, ua rau cov kev cai nruj uas tsis tau muaj dua los ntawm cov ntaub ntawv tswj xyuas thermal. Nyob rau tib lub sijhawm, cov khoom siv uas siv rau hauv qhov chaw huab cua-xws li cov cuab yeej sib sib zog nqus dej hiav txwv thiab tshuaj twj tso kua mis li qub- thov kom ceev cov ntaub ntawv uas sib xyaw ua haujlwm siab, tiv taus corrosion, thiab lub neej ua haujlwm ntev.
Pob zeb diamond muaj ib qho ultra-high thermal conductivity ntawm kwv yees li 2000 W / (m·K) nyob rau hauv chav tsev kub thiab tsis tshua muaj coefficient ntawm thermal expansion, ua rau nws yog ib qho zoo tagnrho cov txheej txheem. Silicon carbide, nyob rau hauv lem, muaj thermal conductivity (kwv yees 490 W / m·K ntawm 300 K), zoo heev thermal expansion compatibility, thiab zoo interfacial wettability nrog pob zeb diamond. Kev sib koom ua ke ntawm ob theem no ua rau cov pob zeb diamond / SiC sib xyaw nrog kev ua tau zoo tag nrho hauv thermal, mechanical, thiab chemical stability.
2. Cov khoom siv thiab qhov zoo
Cov txiaj ntsig tseem ceeb ntawm pob zeb diamond / silicon carbide composites tau tshwm sim hauv cov hauv qab no:
Thermal khoom.Cov khoom sib xyaw ua ke ua ke nrog qhov tshwj xeeb siab thermal conductivity nrog cov coefficient tsawg heev ntawm thermal expansion. Cov kev tshawb fawb tau pom tias cov thermal conductivity ntawm cov khoom sib xyaw npaj los ntawm cov txheej txheem sib txawv tuaj yeem ncav cuag 300-700 W / (m·K) lossis siab dua, deb tshaj li cov khoom siv hluav taws xob sib xws xws li tooj liab (≈400 W / m·K) thiab txhuas (≈200 W / m·K). Coherent Corporation's proprietary pob zeb diamond-loaded SiC ceramic composite tau ua tiav cov isotropic thermal conductivity tshaj 800 W / m·K. Nyob rau hauv cov nqe lus ntawm thermal expansion, lub composite muaj peev xwm ua kom muaj nuj nqis tsawg li 2.49-2.73 × 10⁻⁶ K⁻¹, zoo sib xws ntawm silicon nti substrate (≈2.5 ppm /℃).
Mechanical zog.Lub ultra-high hardness ntawm lub pob zeb diamond theem imparts zoo heev hnav tsis kam mus rau lub composite. Tom qab ua kua-theem silicon infiltration thiab sintering, cov khoom hardness tuaj yeem ncav cuag 48 GPa (HK2). Lub zog flexural tuaj yeem ncav cuag 420.2 MPa, thiab elastic modulus 578.6 GPa, sawv cev nce ntawm 84.5% thiab 34.0%, feem, dhau ntawm cov tshuaj tiv thaiv-bonded silicon carbide. Lub pob tawg toughness tuaj yeem ncav cuag 4.5-5 MPa·m¹/².
Tshuaj stability.Ob lub pob zeb diamond thiab silicon carbide nthuav tawm cov kev tiv thaiv zoo heev, ua rau cov khoom sib xyaw kom muaj kev tiv thaiv corrosion txawm nyob rau hauv alkaline xov xwm thiab hydrothermal tej yam kev mob, nrog residual silicon cov ntsiab lus tswj tau qis dua 5 vol%.
3. Fabrication Technologies
Lub hauv paus ntawm pob zeb diamond / SiC composite fabrication yog nyob rau hauv kev ua tiav kev sib raug zoo ntawm pob zeb diamond thiab SiC matrix, nrog rau qhov ntom ntom thiab tswj kev tsim kho ntawm cov qauv sib xyaw. Raws li lub hauv paus chiv keeb ntawm silicon carbide, fabrication txoj kev yuav muab faib ua ob pawg loj: ib tug uas SiC yog tsim nyob rau hauv situ los ntawm cov txheej txheem tshuaj tiv thaiv, thiab lwm yam nyob rau hauv uas ib tug prefabricated SiC theem yog qhia ncaj qha.
3.1 High-Pressure High-Temperature Sintering
Nyob rau hauv cov txheej txheem high-pressure high-temperature (HPHT) sintering, pob zeb diamond micropowder yog tov nrog silicon hmoov thiab densified nyob rau hauv lub siab thiab kub siab (feem ntau 1-5 GPa, 1450-1600 degree), tso cai rau silicon react nrog carbon ntawm lub pob zeb diamond nto los tsim ib tug silicon carbide matrix. Qhov zoo ntawm txoj kev no suav nrog cov ntsiab lus tsis tshua muaj silicon, siab ceev, thiab muaj zog interfacial bonding; Txawm li cas los xij, nws yuav tsum muaj cov cuab yeej siv tau zoo, suav nrog cov nqi ua haujlwm siab, thiab txwv cov qauv qhov ntev. Thaum tshav kub kub-spreader cov ntaub ntawv npaj nyob rau hauv siab tshaj 5.1 GPa thiab kub ntawm 800-1650℃yuav ua tau thermal conductivities txog li 650 W / m·K.
3.2 Reactive Melt Infiltration
Reactive melt infiltration (RMI) yog ib qho ntawm feem ntau siv cov tswv yim tsim khoom. Cov txheej txheem yooj yim suav nrog cov hmoov sib tov, preforming, debinding, thiab infiltration cov kauj ruam -silicon yog yaj los ntawm cua sov thiab infiltrates mus rau hauv pre-npaj ntxeem tau pob zeb diamond preform nyob rau hauv capillary kev txiav txim los yog thov siab, qhov uas nws reacts nrog carbon ntawm lub pob zeb diamond nto los ua ib tug SiC bonding theem. This method yields high density, good interfacial bonding, and suitability for large‑scale fabrication, but it is prone to residual free silicon and challenges in precise control of the interfacial reaction. Kev sib xyaw ua ke ntawm gelcasting thiab silicon infiltration ua rau kev tsim cov khoom ua haujlwm siab ntawm cov khoom thauj khoom siab txog 65 vol%.
3.3 Precursor Conversion
Hauv txoj kev hloov pauv ua ntej, pob zeb diamond hais sib xyaw nrog silicon-muaj cov organic precursors (piv txwv li, polycarbosilane) thiab tom qab ntawd ua kom sov hauv lub tshuab nqus tsev lossis ib qho chaw tsis zoo rau pyrolyze lub precursor thiab hauv situ tsim SiC matrix. Nws cov txiaj ntsig suav nrog kev ua haujlwm qis dua thiab muaj peev xwm los tsim cov txheej txheem nyuaj lossis cov qauv loj, tab sis qhov ntom ntom feem ntau tsis txaus thiab cov khoom seem seem yuav muaj ntau dua.
3.4 Chemical Vapor Infiltration
Tshuaj vapor infiltration (CVI) qhia txog silicon uas muaj gaseous precursors (xws li, methyltrichlorosilane) mus rau hauv lub pob zeb diamond porous preform ntawm siab kub, depositing SiC nyob rau hauv situ ntawm pob zeb diamond particle nto los ntawm gas-phase cov tshuaj tiv thaiv. Cov txheej txheem no tuaj yeem tsim cov qauv sib xyaw nrog siab purity thiab uniformity, tab sis nws yog kim thiab qeeb.
3.5 Qib txheej txheej txheem
Rau kev siv cov khoom siv, lub koom haum Fraunhofer rau Ceramic Technologies thiab Systems (IKTS) tau tsim cov txheej txheem kev ua kom tiav - ua cov pob zeb diamond-composite txheej nkaus xwb rau ntawm qhov chaw ua haujlwm tau raug kev nyuaj siab (nrog rau pob zeb diamond ntim feem ntawm kwv yees li 50%), thaum lub substrate tseem yog cov pa machinable silicon carbide. Cov kev tshwj xeeb muaj xws li ob-nias kev sib sau thiab slurry txheej; Tom qab ua kua-theem silicon infiltration, lub hardness ntawm lub nto mus txog 48 GPa thiab residual silicon yog qis dua 5%. Qhov kev tsim no txo qis cov nqi ua haujlwm thaum ua kom ntseeg tau qhov kev ua haujlwm ntawm qhov chaw pabcuam tseem ceeb.
3.6 Additive Manufacturing
3D luam ntawv ua ke nrog cov kua-theem silicon infiltration tau qhib txoj hauv kev tshiab rau fabricating pob zeb diamond / SiC Cheebtsam nrog complex geometries. Cov kev tshawb fawb tau pom tias siv cov hmoov bimodal sib tov nrog 75 vol% pob zeb diamond, ua raws li cov kua theem silicon infiltration ntawm 1600 degree, yields composites nrog ib tug thermal conductivity ntawm 300.5 W / m·K thiab ib tug flexural zog ntawm 270.7 MPa. Txoj kev thev naus laus zis no tshwj xeeb tshaj yog tsim rau cov khoom tsim khoom nrog cov txheej txheem sab hauv, xws li cov khoom siv ua kua-txias.
4. Daim ntawv thov teb
4.1 Semiconductor Thermal Management
Kev tswj cov cua kub sawv cev rau cov lus qhia zoo tshaj plaws rau cov pob zeb diamond / SiC sib xyaw. Raws li AI nti fais fab noj mus txog qib kilowatt, cov khoom siv hluav taws xob ua kom sov tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua. Qhov sib xyaw ua ke thermal conductivity tshaj 700 W / (m·K) thiab nws cov coefficient ntawm thermal expansion yog tsawg li 2.6 ppm / degree, zoo sib xws ntawm silicon chip substrate (2.5 ppm / degree), zoo daws cov teeb meem ntawm interfacial tawg thiab kub dissipation tsis ua hauj lwm los ntawm thermal expansion chips. Coherent twb tau siv cov khoom no nyob rau hauv cov xwm txheej xws li ncaj qha nti kub dissipation, microchannel txias daim hlau, thiab semiconductor ntaus ntawv substrates. Thaum Lub Ob Hlis 2026, Tuam Tshoj thawj 8-nti pob zeb diamond hluav taws kub-txheej kab ntau lawm tau raug muab tso rau hauv kev ua haujlwm, cim cov khoom hloov pauv ntawm chav kuaj mus rau kev tsim khoom loj.
4.2 Extreme-Environment Structural Cheebtsam
Hauv cov cuab yeej sib sib zog nqus dej hiav txwv thiab tshuaj lom neeg engineering, twj tso kua mis thiab cov ntsaws ruaj ruaj feem ntau raug rau kev sib xyaw ua ke ntawm cov xov xwm corrosive thiab abrasive hais. Kev cia siab rau lub siab tawv ntawm lub pob zeb diamond theem thiab cov tshuaj lom neeg ruaj khov zoo ntawm ob qho tib si, pob zeb diamond / SiC composites pom zoo hnav thiab corrosion kuj nyob rau hauv kev ua haujlwm hnyav. Nyob rau hauv SubSeaSlide qhov project tau txais nyiaj los ntawm German Tsoom Fwv Saib Xyuas Kev Kawm thiab Kev Tshawb Fawb (BMBF), Fraunhofer IKTS tau xa cov kabmob thiab foob cov qauv ua los ntawm cov khoom siv no rau cov tuam txhab xws li EagleBurgmann, Miba Industrial Bearings, thiab Sulzer, nrog cov txiaj ntsig kev lag luam ua pov thawj zoo heev.
4.3 Synchrotron Radiation Optics
Pob zeb diamond/SiC composites tseem raug tshawb nrhiav los ua cov ntaub ntawv substrate rau X-ray tsom iav hauv high-brightness synchrotron hluav taws xob qhov chaw. Lawv kev sib xyaw ua ke ntawm cov thermal conductivity siab thiab tsis tshua muaj thermal expansion pab tswj cov duab ntawm qhov tseeb ntawm cov khoom siv kho qhov muag nyob rau hauv high-heat-flux irradiation.
5. Interfacial Engineering thiab Performance Optimization
Qhov zoo ntawm interfacial bonding yog qhov tseem ceeb ntawm kev txiav txim siab tag nrho cov kev ua tau zoo ntawm cov khoom sib xyaw. Qhov sib tw ze ntawm coefficients ntawm thermal expansion ntawm pob zeb diamond thiab SiC endows nrog zoo interfacial compatibility; Txawm li cas los xij, interfacial phonon mismatch tseem yog qhov tseem ceeb uas txwv kev thauj mus los ntawm tshav kub.
Cov kev tshawb fawb tau pom tias kev nthuav qhia TiC txheej nruab nrab ntawm pob zeb diamond thiab SiC tuaj yeem tsim ib qho kev sib txuas sib txuas, txo cov suab nrov tsis sib xws thiab qhov sib txawv ntawm qhov sib txawv, thiab txhim kho kev ua haujlwm ntawm lub ntsej muag. Tsis tas li ntawd, tso cov silicon pre-txheej rau ntawm pob zeb diamond nto los ntawm magnetron sputtering ua raws li lub tshuab nqus tsev annealing yuav maj mam hloov silicon rau hauv SiC (amorphous Si → crystalline Si → crystalline Si + SiC → SiC). Composites npaj siv sub-micron pob zeb diamond hmoov raws li cov pa roj carbon tuaj yeem ua tiav cov ntsiab lus ntawm silicon seem tsawg li 7.41 vol% thiab Young's modulus ntawm 572 ± 22 GPa.
6. Kev sib tw thiab Outlook
Txawm hais tias pob zeb diamond / silicon carbide composites muaj peev xwm ua tau zoo, lawv daim ntawv thov loj tseem ntsib ntau yam teeb meem:
Fabrication nqi.Cov txheej txheem xws li HPHT sintering thiab CVI xav tau cov cuab yeej kim thiab kev ua haujlwm ntev, txwv kev tsim khoom loj thiab kev ua haujlwm tau zoo. Txawm hais tias cov nqi txo qis xws li kev tsim qauv tsim thiab kev tsim khoom ntxiv tau ua tiav, lawv tseem nyob deb ntawm daim ntawv thov kev lag luam loj.
Kev sib sau ua ke.Ntau daim ntawv thov scenarios (xws li, daim hlau txias nrog cov dej ntws sab hauv, aspherical optical lo ntsiab muag, thiab lwm yam) xav tau cov geometries nyuaj. Cov txheej txheem molding cov txheej txheem tsis txaus, thiab cov thev naus laus zis tshiab xws li 3D luam ntawv tseem muaj chaw rau kev txhim kho ntawm cov khoom thauj khoom thiab ntom ntom.
Interface optimization.Yuav ua li cas kom ua tau zoo ib yam, tsis tshua muaj thermal-resistance interfacial qauv ntawm ib qho loj tseem yog qhov teeb meem tseem ceeb hauv cov khoom tsim. Cov txheej txheem uas lub thickness, muaj pes tsawg leeg, thiab microstructure ntawm interfacial hloov txheej txheej cuam tshuam rau kev thauj mus los ntawm tshav kub yuav tsum tau ntxiv elucidation.
Standardization thiab kev ntseeg tau.Raws li cov ntaub ntawv tsim tawm tshiab, cov ntaub ntawv ntawm kev ntseeg siab rau kev ua haujlwm ntev, cov qauv ntsuas kev ua tau zoo, thiab cov txheej txheem kev sim tseem tsis tau tsim tiav, yuav tsum muaj kev sib koom tes los ntawm kev kawm thiab kev lag luam kom nce qib.
7. Cov lus xaus
Pob zeb diamond / silicon carbide composites integrates lub ultra-high thermal conductivity ntawm pob zeb diamond nrog rau tag nrho cov khoom zoo ntawm silicon carbide, qhia dav daim ntawv thov kev cia siab nyob rau hauv semiconductor thermal tswj, huab-ib puag ncig cov yam ntxwv Cheebtsam, high-power optical ntsiab, thiab ntau dua. Nrog txuas ntxiv kev nce qib hauv kev tsim thev naus laus zis, kev nkag siab tob dua ntawm kev sib tshuam engineering, thiab kev ua kom muaj kev lag luam nrawm, cov khoom siv no tau npaj los ua cov khoom tseem ceeb uas tsis tseem ceeb rau cov khoom siv high-end tiam tom ntej thiab cov khoom siv hluav taws xob. Los ntawm cov cuab yeej sib sib zog nqus dej hiav txwv mus rau AI cov chaw khaws ntaub ntawv, pob zeb diamond / SiC cov khoom sib txuas tsis tu ncua los ntawm chav kuaj mus rau theem dav dav engineering.