1. Tsarin Crystal da Polytypism na Silicon Carbide
1.1 Cubic da Hexagonal Polytypes: Daga 3C zuwa 6H da Baya
(Silicon Carbide Ceramics)
Silicon carbide (SiC) yumbu ne da aka riko da shi wanda ya ƙunshi silicon da carbon atom da aka saita a cikin haɗin gwiwar tetrahedral., ƙirƙirar ɗaya daga cikin mafi hadaddun tsarin polytypism a kimiyyar kayan aiki.
Ba kamar yumbu da yawa tare da tsarin lu'ulu'u na tsaye ba, SiC yana wanzuwa 250 sanannun polytypes– jeren jeri daban-daban na makusantan Si-C bilayers tare da c-axis– bambanta daga cubic 3C-SiC (Hakanan ana kiranta da β-SiC) zuwa hexagonal 6H-SiC da rhombohedral 15R-SiC.
Ɗaya daga cikin nau'ikan nau'ikan nau'ikan da aka saba amfani da su a aikace-aikacen ƙira shine 3C (mai siffar sukari), 4H, da 6 h (biyu hexagonal), kowanne yana nuna ƴan sifofi daban-daban na igiyoyi na lantarki da kuma abubuwan da suka shafi thermal.
3C-SiC, da zinc blende framework, yana da mafi kunkuntar bandgap (~ 2.3 eV) kuma yawanci ana faɗaɗa akan abubuwan siliki don kayan aikin semiconductor, yayin da 4H-SiC ke ba da sassaucin wutar lantarki mai ban mamaki kuma ana fifita shi don na'urorin lantarki masu ƙarfi.
Ingantacciyar haɗin kai da yanayin jagora na Si– C bond yana ba da ƙarfi na musamman, thermal tsaro, da juriya ga zamewa da harin sinadarai, yin SiC manufa don matsananciyar aikace-aikacen yanayi.
1.2 Batutuwa, Doping, da Dijital Residence
Ba tare da la'akari da ƙaƙƙarfan tsarin sa ba, Ana iya yin amfani da SiC don samun nau'in n-type da nau'in p-nau'i, ba da damar amfani da shi a cikin na'urorin semiconductor.
Nitrogen da phosphorus suna taimakawa a matsayin gurɓatacce, gabatar da electrons kai tsaye cikin rukunin watsawa, yayin da ƙananan aluminum da boron suna aiki a matsayin masu karɓa, samar da ramuka a cikin valence band.
Duk da haka, P-type doping inganci an iyakance shi ta babban ikon kunnawa, musamman a cikin 4H-SiC, wanda ke haifar da cikas ga shimfidar kayan aikin bipolar.
Lalacewar asali kamar surkulle ba daidai ba, micropipes, da kurakurai masu tarin yawa na iya raunana aikin kayan aiki ta yin aiki azaman wuraren sake haɗawa ko kwasa-kwasan zube, neman babban daraja guda-crystal ci gaba don aikace-aikacen lantarki.
Babban bandgap (2.3– 3.3 eV dangane da polytype), babban gazawar lantarki yankin (~ 3 MV/cm), da kyau kwarai thermal watsin (~ 3– 4 W/m · K don 4H-SiC) sanya SiC ya fi siliki a cikin matsanancin zafin jiki, babban ƙarfin lantarki, da kuma na'urorin lantarki masu yawan gaske.
2. Gudanarwa da Ƙirƙirar Ƙira
( Silicon Carbide Ceramics)
2.1 Dabarun Sintering da Densification
Silicon carbide a dabi'ance yana da wahala a ƙirƙira saboda ƙaƙƙarfan haɗin haɗin gwiwa da rage yawan rarraba kai., suna buƙatar sabbin dabarun sarrafawa don samun cikakken yawa ba tare da ƙari ba ko tare da ɗan ƙaramin taimako.
Rashin matsi na foda na SiC na submicron yana yiwuwa tare da haɓaka boron da carbon, wanda ke haɓaka ƙima ta hanyar kawar da yadudduka na oxide da haɓaka yaduwa mai ƙarfi.
Dumi turawa yana shafi matsa lamba uniaxial yayin dumama gida, ƙyale cikakken densification a rage yawan zafin jiki matakan (~ 1800– 2000 ° C )da samar da m-grained, manyan abubuwan da suka dace don rage na'urori da saka sassa.
Don manyan siffofi ko rikitarwa, Ana amfani da haɗin gwiwar amsawa, Inda ake shigar da abubuwan da ake amfani da su na carbon da aka narkar da su tare da narkakkar siliki a ~ 1600 ° C, ƙirƙirar β-SiC a cikin wurin tare da raguwar gefe.
Duk da haka, saura kudin siliki (~ 5– 10%) ya rage a cikin microstructure, iyakance high-zazzabi yadda ya dace da hadawan abu da iskar shaka juriya a sama 1300 ° C.
2.2 Ƙirƙirar Ƙarfafawa da Ƙirƙirar Siffar-Kusa-Net
Nasarorin da ake samu a yanzu a masana'antar ƙari (AM), specifically binder jetting and stereolithography using SiC powders or preceramic polymers, allow the fabrication of intricate geometries formerly unattainable with conventional approaches.
In polymer-derived ceramic (PDC) routes, fluid SiC forerunners are formed through 3D printing and then pyrolyzed at heats to produce amorphous or nanocrystalline SiC, commonly needing more densification.
These techniques lower machining prices and product waste, making SiC much more available for aerospace, nukiliya, and warm exchanger applications where complex layouts enhance efficiency.
Post-processing actions such as chemical vapor infiltration (CVI) or fluid silicon seepage (LSI) are sometimes utilized to improve density and mechanical stability.
3. Makanikai, Thermal, and Environmental Efficiency
3.1 Ƙarfi, Hardness, and Use Resistance
Silicon carbide ranks among the hardest recognized products, tare da mohs ƙarfi na ~ 9.5 da ƙarfi Vickers ya zarce 25 Matsakaicin matsayi, yin shi sosai rigakafi ga abrasion, tarwatsewa, da kuma gogewa.
Ƙarfin sa na sassauƙa gabaɗaya ya fito daga 300 ku 600 MPa, dogara ga tsarin sarrafawa da girman hatsi, kuma yana kiyaye tauri a yanayin zafi har zuwa 1400 ° C a cikin inert ambiences.
Karfin karaya, yayin da tawali'u (~ 3– 4 MPa · m 1ST/ BIYU), ya wadatar don aikace-aikacen gine-gine da yawa, musamman idan an haɗa shi tare da tallafin fiber a cikin abubuwan haɗin yumbu matrix (CMCs).
Ana amfani da CMC na tushen SiC a cikin injin turbine, konewa rufi, da tsarin birki, inda suke ba da ajiyar farashi mai nauyi, iskar gas, da tsawon rayuwar sabis fiye da kwatankwacin ƙarfe.
Juriyar sawa ta musamman ta sa SiC ta zama cikakke don hatimi, bearings, abubuwan famfo, da garkuwar ballistic, inda sturdiness karkashin matsananci lodi na inji yana da mahimmanci.
3.2 Thermal Conductivity da Oxidation Tsaro
Ofaya daga cikin mafi fa'idodin mazaunin SiC ko kaddarorin kasuwanci shine babban ƙarfin zafin sa– kusan 490 W/m · K don guda-crystal 4H-SiC da ~ 30– 120 W/m · K don nau'ikan polycrystalline– wuce na karafa da yawa da kuma sa ya yiwu ga tasiri mai tasiri na zafi.
Wannan kadarar gida tana da mahimmanci a cikin kayan lantarki, inda na'urorin SiC ke haifar da ƙarancin ɓata zafi kuma suna iya gudana a mafi girman ƙarfin ƙarfi fiye da na'urorin tushen silicon.
A haɓaka matakan zafin jiki a cikin mahallin oxidizing, SiC yana ƙirƙirar siliki mai karewa (SiO ₂) Layer wanda ke rage ƙarin oxidation, yana ba da kyakkyawan ingancin muhalli kamar yadda ~ 1600 ° C.
Duk da haka, a cikin yanayi mai wadatar tururi, wannan Layer na iya canzawa kamar Si(OH)₄, yana haifar da saurin lalacewa– babban kalubale a aikace-aikacen injin turbin gas.
4. Manyan Aikace-aikace a Makamashi, Na'urorin Lantarki, da Aerospace
4.1 Na'urorin Wutar Lantarki da Na'urorin Semiconductor
Silicon carbide ya canza wutar lantarki ta hanyar ba da damar na'urori irin su Schottky diodes., MOSFETs, da JFETs waɗanda ke aiki a mafi girman ƙarfin lantarki, mitoci, da yanayin zafi fiye da ma'aunin silicon.
Wadannan kayan aikin suna rage asarar makamashi a cikin motocin lantarki, sabunta makamashi inverters, da kuma motocin lantarki na kasuwanci, ƙara zuwa haɓaka ingantaccen ƙarfin lantarki na duniya.
Ƙarfin yin aiki a matakan zafin haɗin gwiwa ya ƙare 200 ° C yana ba da izinin daidaita tsarin sanyaya da haɓaka amincin tsarin.
Bugu da kari, Ana amfani da wafers na SiC azaman maƙasudin gallium nitride (GaN) epitaxy a high-electron-mobility transistor (HEMTs), hade da fa'idodin duka biyu-bandgap semiconductors.
4.2 Makamin nukiliya, Jirgin sama, da Kayan aikin gani
A cikin masana'antar makamashin atomic, SiC shine maɓalli na ƙulla mai jure haɗari, inda ta rage sha neutron giciye-section, juriya na radiation, kuma tsananin zafin jiki yana inganta aminci da tsaro da inganci.
A cikin sararin samaniya, Ana amfani da abubuwan haɗin fiber na SiC a cikin injunan jet da motocin hypersonic don sauƙin nauyi da kwanciyar hankali..
Bugu da kari, Ana amfani da madubin SiC masu laushi masu santsi da na'urorin da suka rigaya a baya sakamakon girman girman su., thermal kwanciyar hankali, da polishability zuwa sub-nanometer roughness.
a takaice, Silicon carbide yumbura yana tsaye don maɓalli na kayan ci gaba na zamani, hada fitattun injiniyoyi, thermal, da kaddarorin dijital.
Tare da takamaiman iko na polytype, microstructure, da handling, SiC ya rage don ba da damar sabbin hanyoyin fasaha a cikin iko, sufuri, da matsananciyar saitin injiniya.
5. Mai bayarwa
TRUNNANO shine mai siyar da Spherical Tungsten Powder tare da sama 12 shekaru na gwaninta a cikin nano-ginin makamashi kiyayewa da nanotechnology ci gaban. Yana karɓar biyan kuɗi ta Katin Kiredit, T/T, West Union da Paypal. Trunnano zai jigilar kayayyaki zuwa abokan ciniki a ketare ta hanyar FedEx, Farashin DHL, ta iska, ko ta teku. Idan kuna son ƙarin sani game da Spherical Tungsten Powder, da fatan za a ji daɗin tuntuɓar mu kuma ku aiko da tambaya([email protected]).
Tags: siliki carbide yumbu,silicon carbide yumbu kayayyakin, yumbu masana'antu
Duk labarai da hotuna daga Intanet suke. Idan akwai wasu batutuwan haƙƙin mallaka, don Allah a tuntube mu a lokacin sharewa.
A tambaye mu