Bakeng sa bareki ba machaba le baokameli ba thepa ea thepa, ho utloisisa mefuta e mengata ea phofo ea silicon carbide hase feela tlhokahalo ea theknoloji - ke tlhokahalo ea tlhōlisano. Ho sa tsotellehe hore na e sebelisoa e le deoxidizer ha ho etsoa tšepe, ho sebetsa ka mokhoa o phahameng ka ho fetisisa, kapa karolo ea bohlokoa ea motlakase oa motlakase oa motlakase (EV), SiC e fana ka motsoako o ikhethang oa boima, conductivity ea mocheso le botsitso ba lik'hemik'hale.
Silicon Carbide (SiC) ke eng?
Silicon carbide ke semiconductor e kopantsoeng e entsoeng ka silicon le carbon. Ka tlhaho, ha e fumanehe ka mokhoa o ikhethang, e fumanehang feela ka bongata mefuteng e itseng ea meteorite le li-deposit tsa corundum. Ka lebaka leo, hoo e batlang e le li-silicon carbide tsohle tse sebelisoang indastering li hlahisoa ka mokhoa oa maiketsetso.
Sebopeho sa Crystal
SiC e ikhethile hobane e bonts'a polymorphism, e bolelang hore e ka ba teng ka mefuta e fetang 250 ea kristale. Mehaho e atileng haholo e kenyelletsa:
Alpha Silicon Carbide (α-SiC): Polymorph e tloaelehileng ka ho fetisisa, e khetholloang ke sebopeho sa kristale sa hexagonal. E tsitsitse mochesong o ka holimo ho 1700°C.
Beta Silicon Carbide (β-SiC): Foromo ena e na le sebopeho sa cubic crystal (e ts'oanang le taemane) 'me e etsoa ka mocheso o ka tlase ho 1700°C.
Thepa ea Bohlokoa ea 'Mele le Lik'hemik'hale
Ke hobane'ng ha phofo ea SiC e batloa hakaale? Melemo ea ts'ebetso ea eona ha e bapisoe:
Mathata a Feteletseng: Ka boima ba Mohs ba 9.0 ho isa ho 9.5, ke ea bobeli feela ho daemane le boron carbide.
High Thermal Conductivity: SiC e tlosa mocheso ka potlako ho feta litšepe tse ngata, e etsa hore e be e loketseng bakeng sa libaka tse phahameng tsa mocheso.
Katoloso e tlase ea Thermal: E hanela ho loana kapa ho peperana tlas'a liphetoho tsa tšohanyetso tsa mocheso (ho hanyetsa mocheso o motle haholo).
Ho se Bone ha Lik'hemik'hale: Ha e khone ho bola haholo ho tsoa ho li-acids, alkalis, le letsoai le qhibilihisitsoeng, esita le mocheso o phahameng.
Thepa ea Semiconducting: Ho fapana le li-abrasives tse ling tse ngata, SiC ke semiconductor e nang le li-bandgap tse ngata, e fetolang indasteri ea lisebelisoa tsa motlakase.
Mokhoa oa Tlhahiso: Mokhoa oa ho Acheson le ho Feta
Tlhahiso ea bohloeki bo phahameng
silicon carbide phofoke ts'ebetso e kenyang chelete e ngata le matla a mangata.
Mokhoa oa Acheson
E qapiloe ke Edward Goodrich Acheson ka 1891, ona e ntse e le mokhoa o ka sehloohong oa tlhahiso e kholo.
Lisebelisoa tse tala: Lehlabathe la silica le hloekileng haholo (SiO2) le petroleum coke (C) li kopantsoe. Maemong a mang, sawdust le letsoai li kenngoa ho laola porosity le ho tlosa litšila.
Sebōpi sa Motlakase: Motsoako o behoa ka sebōping sa ho hanyetsa. Motlakase o fetisetsoa mokokotlong oa graphite, o futhumatsa motsoako o potolohileng mocheso o pakeng tsa 1,700 ° C le 2,500 ° C.
Karabelo ea Lik'hemik'hale: Karabelo ea SiO2 + 3C → SiC + 2CO e etsahala.
Kotulo: Hang ha sebōpi se pholile, ho thehoa "cylindrical" boima ba likristale tsa SiC. Motheo o na le bohloeki bo phahameng ka ho fetisisa (Green SiC), ha likarolo tse ka ntle li hlahisa Black SiC.
Ho sebetsa ka phofo
Hang ha likristale tse tala li kotuloa, li feta mekhahlelo e mengata ea ho sebetsa:
Ho pshatla le ho sila: Ho sebelisa li-crushers tsa mohlahare, li-hamore mill kapa li-ball Mills ho fokotsa likristale hore e be phofo.
Grading (Sizing): Ho sebelisa li-skrini tse thothomelang kapa lihlopha tsa moea ho netefatsa hore phofo e kopana le boholo bo itseng ba grit (mohlala, litekanyetso tsa FEPA, JIS, kapa ANSI).
Ho hlatsoa le ho Hloekisa Acid: Ho tlosa tšepe e setseng, silicon e sa lefelloeng, kapa carbon, phofo e atisa ho phekoloa ka lik'hemik'hale ho finyella maemo a bohloeki a 98% ho 99.9%.
Black vs. Green Silicon Carbide: Ho Utloisisa Phapano
Marakeng oa lefats'e, phofo ea SiC hangata e arotsoe ka 'mala oa eona, o bonts'ang bohloeki ba eona le ts'ebeliso e reriloeng.
Black Silicon Carbide (Black SiC)
Black SiC e na le hoo e ka bang 95% ho isa ho 98% SiC. 'Mala oa eona o lefifi o bakoa ke likarolo tse ngata tsa litšila tsa tšepe le carbon.
Litšobotsi: E matla hanyane empa e fokola ho feta SiC e tala.
Molemo ka ho Fetisisa Bakeng sa: Ho sila lisebelisoa tse matla tse phahameng tse kang tšepe e entsoeng ka tšepe, litšepe tse se nang ferrous (koporo, aluminium), le lisebelisoa tse se nang tšepe (lejoe, rabara, lehong). Hape ke khetho ea mantlha bakeng sa deoxidization ea metallurgical.
Green Silicon Carbide (Green SiC)
Green SiC ke phapang e phahameng ea bohloeki, hangata e fetang 99% ea SiC content.
Litšobotsi: Boima bo phahameng le matla a holimo a ho itšeha ha a bapisoa le SiC e ntšo.
Molemo ka ho Fetisisa Bakeng sa: Ho sila ka nepo ha thepa e thata le e brittle joalo ka tungsten carbide, likhalase tsa optical, ceramics, le semiconductor wafers.
Lisebelisoa tsa Mantlha tsa Indasteri
Metallurgy le Ho Etsa Litšepe
Lefapheng la metallurgical, SiC powder e sebetsa e le deoxidizer e matla le mohloli oa mafura ka har'a li-cupola le libono tsa motlakase tsa arc.
Melemo: E ntlafatsa metsi a tšepe e qhibilihisitsoeng, e matlafatsa silicon le litekanyetso tsa ho hlaphoheloa ha carbon, 'me e fokotsa tšebeliso ea matla ka kakaretso ea ts'ebetso ea ho qhibiliha.
Tlhahiso ea tšepe ea Cast: E khothalletsa ho thehoa ha li-graphite flakes, tse lebisang ho boleng bo holimo ba bohlooho le ba ductile iron castings.
Abrasives le Surface Finishing
Mohlomong ena ke ts'ebeliso ea setso ea SiC phofo.
Li-Bonded Abrasives: E sebelisetsoa ho etsa mabili a silang le li-disc tsa ho itšeha.
Li-Abrasives tse Koaheletsoeng: E sebelisoa ka li-sandpaper le mabanta a ho bentša.
Lapping & polishing: Liphofshoana tse ntle tsa SiC li sebelisoa ho "slurries" bakeng sa ho roala li-valve ka nepo, likere le li-semiconductor substrates.
Refractories le Ceramics
Ka lebaka la boemo ba eona bo phahameng ba ho qhibiliha (e kokobetsa hoo e ka bang 2,700 ° C) le katoloso e tlase ea mocheso, SiC ke sesebelisoa sa pele se hanyetsang.
Kiln Furniture: Lipoleiti tsa SiC le maballo li sebelisoa liitseng tsa ceramic hobane ha li holofale tlas'a meroalo e boima mochesong o feteletseng.
Tekheniki ea Ceramics: E sebelisoa ka har'a liphahlo tse sa keneleng likulo, lireng tsa tiiso bakeng sa lipompo, le li-brake discs tsa likoloi.
Advanced Electronics(The SiC Revolution)
Lekholong la bo21 la lilemo ho bile le keketseho ea tlhoko ea SiC bakeng sa indasteri ea semiconductor.
Lisebelisoa tsa Matla: Li-MOSFET tse thehiloeng ho SiC le li-diode li sebetsa hantle ho feta likarolo tsa silicon tse tloaelehileng. Li bohlokoa bakeng sa lisebelisoa tsa ho tjhaja ka potlako le li-inverters ho Likoloi tsa Motlakase(EVs).
5G Infrastructure: SiC e sebetsa e le setsi sa Gallium Nitride (GaN) lisebelisoa tsa SiC, tse nang le liteishene tsa motheo tsa 5G tse matla haholo.
Maemo a Boleng ba Lefatše bakeng sa Phofo ea SiC
Ha o batla
SiC phofoMachabeng, bareki ba tlameha ho sebelisa mekhoa e fapaneng ea maemo:
FEPA(Federation of European Producers of Abrasives):E sebelisa "F"(bakeng sa li-abrasives tse kopantsoeng) le"P"(bakeng sa li-abrasives tse koahetsoeng)(mohlala,F240,P1200).
JIS(Maemo a Indasteri a Majapane): E tloaelehile limmarakeng tsa Asia(mohlala,#3000).
ANSI(Setsi sa Maemo a Naha sa Amerika): E etselitsoe 'maraka oa Amerika Leboea.
Maemo a Bohloeki ke a Bohlokoa:
Sehlopha sa Metallurgical: 88% -95%SiC.
Sehlopha sa Abrasive: 96% -98.5%SiC.
Bohloeki bo Phahameng/Kereiti ea Ceramic:99%SiC.
Silicon carbide powder ke ntho e fetang e bonolo ea abrasive.Ke thepa ea theknoloji e phahameng e koalang lekhalo pakeng tsa indasteri e boima ea setso le bokamoso ba matla a hloekileng.Ka ho utloisisa litekanyetso tsa eona, mekhoa ea tlhahiso, le likopo, litsebi tsa metallurgy le litsebi tsa ho reka thepa li ka etsa bonnete ba hore li khetha sehlahisoa se nepahetseng ho ntlafatsa ts'ebetso ea bona le boleng ba sehlahisoa.
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