1. Dhismaha Crystal iyo Polytypism ee Silicon Carbide
1.1 Noocyo badan oo cubic iyo lix gees ah: Laga soo bilaabo 3C ilaa 6H iyo Hore
(Ceramics Silicon Carbide)
Silikoon carbide (SiC) is a covalently adhered ceramic composed of silicon and carbon atoms set up in a tetrahedral sychronisation, creating one of the most complex systems of polytypism in materials science.
Unlike a lot of ceramics with a solitary steady crystal framework, SiC exists in over 250 noocyo badan oo caan ah– distinct piling sequences of close-packed Si-C bilayers along the c-axis– varying from cubic 3C-SiC (additionally referred to as β-SiC) to hexagonal 6H-SiC and rhombohedral 15R-SiC.
One of the most usual polytypes used in design applications are 3C (cubic), 4H, and 6H (labada geesood), each showing a little various electronic band structures and thermal conductivities.
3C-SiC, with its zinc blende framework, has the narrowest bandgap (~ 2.3 eV) and is usually expanded on silicon substrates for semiconductor tools, halka 4H-SiC ay bixiso dabacsanaan elektaroonig ah oo cajiib ah waxaana loo doorbiday aaladaha elektiroonigga ah ee awoodda sare leh.
Isku-xidhka adag iyo dabeecadda jihaynta ee Si– C bond waxay ku siinaysaa adkeysi gaar ah, ilaalinta kulaylka, iyo iska caabinta silbashada iyo weerarka kiimikada, samaynta SiC ku haboon codsiyada deegaanka xad-dhaaf ah.
1.2 Arrimaha, Doping, iyo Deganaanshaha Dijital ah
Iyadoo aan loo eegin qallafsanaantiisa qaabdhismeedkiisa, SiC waa la daabici karaa si loo helo habdhaqanka n-nooca iyo nooca p-ba, u oggolaanaya isticmaalkeeda aaladaha semiconductor.
Nitrojiin iyo fosfooraska waxay u adeegaan sida wasakhowga ka qaybqaata, soo bandhigida elektarooniga saxda ah ee qaybta gudbinta, halka aluminium iyo boron-ka fudud ay u shaqeeyaan sidii kuwa aqbalaya, soo saarida godadka valence band.
Si kastaba ha ahaatee, Waxtarka doping nooca-p waxaa xaddiday awoodaha firfircoonida sare, gaar ahaan 4H-SiC, Taas oo caqabad ku ah qaabaynta qalabka laba-cirifoodka.
Cilladaha asaliga ah sida meelayn khaldan, tuubooyinka yaryar, iyo khaladaadka xad-dhaafka ah waxay wiiqi karaan waxqabadka qalabka iyagoo u dhaqmaya sidii tas-hiilaad dib-u-habayn ama koorsooyin qulqulaya, dalbanaya horumar heer sare ah hal-crystal ee codsiyada elektarooniga ah.
Xakamaynta ballaaran (2.3– 3.3 eV waxay kuxirantahay nooca badan), aagga korantada ee xumaaday sare (~ 3 MV/cm), iyo kulaylka ugu fiican (~ 3– 4 W/m · K loogu talagalay 4H-SiC) SiC ka dhig mid aad uga sarreeya silikon heerkulka sare, koronto-sare, iyo koronto badan oo koronto ah.
2. Wax ka qabashada iyo Naqshad Dhisme yar
( Ceramics Silicon Carbide)
2.1 Farsamooyinka Cufnaanta iyo Dareen-celinta
Silicon carbide dabiici ahaan way adagtahay in la cufsado sababtoo ah isku xidhka adag ee isku xidhan iyo hoos u dhaca isku xidhka is-faafinta, u baahan farsamooyin habaysan oo hal-abuur leh si loo helo cufnaanta buuxda iyada oo aan wax lagu darin ama caawimo aad u yar.
Pressureless sintering of submicron SiC powders is feasible with the enhancement of boron and carbon, which promote densification by eliminating oxide layers and enhancing solid-state diffusion.
Warm pushing applies uniaxial pressure during home heating, allowing full densification at reduced temperature levels (~ 1800– 2000 ° C )and generating fine-grained, high-strength components ideal for reducing devices and put on parts.
For big or complicated shapes, response bonding is used, where porous carbon preforms are penetrated with molten silicon at ~ 1600 ° C, creating β-SiC in situ with marginal shrinkage.
Si kastaba ha ahaatee, residual cost-free silicon (~ 5– 10%) remains in the microstructure, limiting high-temperature efficiency and oxidation resistance above 1300 ° C.
2.2 Additive Production and Near-Net-Shape Manufacture
Current breakthroughs in additive manufacturing (AM), gaar ahaan binder jetting iyo stereolithography iyadoo la isticmaalayo budada SiC ama polymers preceramic, U oggolow abuuritaanka joomatariyada qallafsan ee aan hore loo gaadhi karin iyadoo la raacayo habab caadi ah.
In dhoobada polymer-ka soo jeeda (PDC) waddooyinka, dareere SiC horudhacayaasha waxaa lagu sameeyay daabacaadda 3D ka dibna dabaylo lagu sameeyay kulaylka si loo soo saaro amorphous ama nanocrystalline SiC, caadi ahaan u baahan cufnaanta dheeraad ah.
Farsamooyinkani waxay hoos u dhigaan qiimaha mashiinka iyo qashinka alaabta, samaynta SiC in badan oo diyaar u ah hawada sare, nukliyeerka, iyo codsiyada isweydaarsiga diiran halkaas oo qaab-dhismeedyo adag ay kor u qaadaan waxtarka.
Falalka habayntu ka dib sida soo galinta uumiga kiimikada (CVI) ama dareeraha silikoon jeexan (LSI) Mararka qaarkood waxaa loo adeegsadaa si loo hagaajiyo cufnaanta iyo xasilloonida farsamada.
3. Makaanik, Kulul, iyo Waxtarka Deegaanka
3.1 Xoog, Adag, iyo Isticmaal iska caabin
Silicon carbide ayaa ka mid ah alaabooyinka ugu adag ee la aqoonsan yahay, oo leh Mohs adag oo ah ~ 9.5 iyo adkaanta Vickers oo dhaaftay 25 Celceliska dhibcaha darajada, taasoo ka dhigaysa mid aad uga hortagta nabarrada, kala daadsanaan, iyo xoqid.
Xoogeeda dabacsanaantu guud ahaan waxay u dhaxaysaa 300 ku 600 MPa, ku tiirsanaanta habka habaynta iyo cabbirka hadhuudhka, waxayna ilaalisaa adkaanta heerkulka ilaa 1400 ° C ee jawiga aan firfircoonayn.
Xoog jab, inta suubban (~ 3– 4 MPa · m 1st/LABAAD), ayaa ku filan codsiyada badan ee naqshadaha, gaar ahaan marka lagu daro taageerada fiber-ka ee isku-dhafka matrix-ka dhoobada ah (CMC-yada).
CMCs-ku-saleysan SiC-yada waxaa lagu isticmaalaa marawaxadaha marawaxadaha, dahaarka gubanaya, iyo hababka biriiga, halkaas oo ay ku bixiyaan kaydinta kharashka miisaanka, waxtarka gaaska, iyo nolol dheer oo adeeg oo ka badan macdan u dhigma.
Xirashada gaarka ah ee iska caabinteeda ayaa SiC ka dhigaysa mid ku habboon shaabadaysan, dhalista, walxaha bamka, iyo gaashaanka ballistic, Halkaas oo ay adag tahay marka la saaro culeyska farsamo ee aadka u daran.
3.2 Hab-dhaqanka Kulaylka iyo Ammaanka Oxidiyaha
One of SiC’s most useful residential or commercial properties is its high thermal conductivity– qiyaastii 490 W/m · K for single-crystal 4H-SiC and ~ 30– 120 W/m · K for polycrystalline types– going beyond that of lots of metals and making it possible for effective heat dissipation.
This residential property is important in power electronics, where SiC devices generate much less waste heat and can run at greater power densities than silicon-based gadgets.
At raised temperature levels in oxidizing environments, SiC creates a protective silica (SiO ₂) layer that reduces additional oxidation, offering good ecological sturdiness as much as ~ 1600 ° C.
Si kastaba ha ahaatee, in water vapor-rich atmospheres, this layer can volatilize as Si(OH)₄, resulting in accelerated degradation– a key challenge in gas turbine applications.
4. Advanced Applications in Energy, Qalabka Elektarooniga ah, iyo Aerospace
4.1 Qalabka Elektarooniga ah ee Korontada iyo Qalabka Semiconductor
Silicon carbide waxa ay beddeshay tamarta korantada ee elektiroonigga ah iyada oo u suurtogelisay qalabyada sida Schottky diodes, MOSFET-yada, iyo JFET-yada ku shaqeeya danab sare, soo noqnoqoshada, iyo heerkul ka badan isku-dheelitirnaanta silikoon.
Qalabkani wuxuu hoos u dhigayaa khasaaraha tamarta ee baabuurta korontada, rogayaasha tamarta la cusboonaysiin karo, iyo matoorada korontada ee ganacsiga, ku darida kor u qaadida hufnaanta tamarta caalamiga ah.
Awooda in lagu ordo heerarka heerkulka isgoysyada way dhaaftay 200 ° C waxa ay ogolanaysaa habab qaboojin oo la hagaajiyay iyo kalsoonida nidaamka oo kor loo qaaday.
Intaa waxaa dheer, Wafers-ka SiC waxa loo isticmaalaa substratums gallium nitride (GAN) Epitaxy ee transistor-ka-dhaqdhaqaaqa sare leh (HEMTs), isku dhafka faa'iidooyinka labada semiconductors-bandgap ballaaran.
4.2 Nukliyeer, Hawada hawada, iyo Qalabka indhaha
In dhirta tamarta atomiga, SiC waa shay muhiim ah oo shil ku xidhidhiyaha u adkaysta, halkaas oo nuugista neutron-ku hoos u dhacay, iska caabinta shucaaca, iyo heerkulka sare ee adag wuxuu hagaajiyaa badbaadada iyo amniga iyo waxtarka.
Hawada sare, Isku-darka SiC-fiber-ka-xoojiyey ayaa loo isticmaalaa matoorada jet-ka iyo baabuurta hypersonic si ay u fududaato xasilloonida kulaylka..
Intaa waxaa dheer, Muraayadaha SiC-da aadka u jilicsan ayaa loo adeegsaday telescopes-ka hore taas oo ay sabab u tahay adkeysigooda-cufnaanta sare., xasilloonida kulaylka, iyo poliishability to sub-nanometer roughness.
Marka la soo koobo, ceramics silicon carbide waxay u taagan tahay dhagax furaha qalabka casriga ah ee casriga ah, isku darka makaanik heer sare ah, kulaylka, iyo guryaha dhijitaalka ah.
Iyada oo si gaar ah loo kantaroolo nooca badan, qaab-dhismeed yar, iyo maaraynta, SiC ayaa weli ah si ay awood ugu yeelato hal-abuurnimada tignoolajiyada ee awoodda, gaadiidka, iyo injineernimada dejinta xad-dhaaf ah.
5. Alaab-qeybiye
TRUNNANO waa alaab-qeybiye Spherical Tungsten Powder leh oo dheeraad ah 12 sano oo waayo-aragnimo ah ilaalinta tamarta nano-dhiska iyo horumarinta nanotechnology. Waxay ku aqbashaa lacag bixinta iyada oo loo marayo Kaarka Credit Card, T/T, West Union iyo Paypal. Trunnano ayaa alaabta u rari doona macaamiisha dibadda iyada oo loo marayo FedEx, DHL, hawo, ama badda. Haddii aad rabto inaad wax badan ka ogaato Spherical Tungsten Powder, fadlan xor u noqo inaad nala soo xidhiidho oo aad u soo dirto su'aalo([email protected]).
Tags: dhoobada silikoon carbide,alaabta dhoobada silicon carbide, dhoobada warshadaha
Dhammaan maqaallada iyo sawirradu waxay ka yimaadeen internetka. Haddii ay jiraan arrimo xuquuqda daabacaadda, fadlan nala soo xidhiidh wakhtiga aad tirtirayso.
na waydii