① Dub silicon carbidemuaj li ntawm 95% SiC thiab muaj zog ntau dua li ntsuab silicon carbide. Nws feem ntau yog siv los ua cov ceramics, cov ntaub ntawv refractory thiab non-ferrous hlau.
② Ntsuab silicon carbidemuaj ntau tshaj li ntawm 97% SiC thiab muaj cov khoom zoo rau tus kheej. Nws feem ntau yog siv los ua cov cemented carbide thiab kho qhov muag iav nrog rau kev sib tsoo zoo ntawm cov cuab yeej siv high-speed steel.
Cov yam ntxwv ntawm silicon carbide
Hardness
Silicon carbide muaj siab hardness thiab feem ntau nyuaj thiab nkig. Nws tuaj yeem siv los ua cov khoom sib tsoo. Silicon carbide particles siv los ua abrasives tawg thaum sib tsoo los tsim cov chaw tawg tshiab, uas yog tom qab ntawd rov ua dua. Cov txheej txheem no rov ua dua kom ua tiav kev sib tsoo ntau dua. Nws qhov tsis zoo yog tias nws nyuaj rau kev ua cov ceramics tom qab sintering. Vim nws yog nkig, nws yooj yim puas thaum siv los ua khoom.
Thaum tshav kub kub kuj
Silicon carbide muaj lub siab melting point thiab zoo kub tsis kam.
Thermal conductivity
Feem ntau hais lus, cov thermal conductivity ntawm silicon carbide nyob ntawm cov ntsiab lus ntawm impurities nyob rau hauv silicon carbide crystal hais. Qhov tsawg impurities, qhov siab dua thermal conductivity.
Rigidity (elastic modulus)
Lub elastic modulus ntawm silicon carbide ceramics yog siab heev, tshaj 400GPa, thib ob tsuas yog boron carbide (B4C), thiab ob zaug ntawm stainless hlau (li 200GPa).
Kev coj ua
Silicon carbide hmoov uas ua los ntawm cov txheej txheem Acheson muaj cov kua nitrogen, yog li nws yog semiconductive thiab muaj ntau yam ntawm ntim resistivity.
Kev siv cov silicon carbide
Cov khoom siv refractory
Nyob rau hauv cov nqe lus ntawm daim ntawv thov refractory, feem ntau yog siv rau crude steel ntau lawm. Nws tau kwv yees tias kwv yees li 80% ntawm silicon carbide hmoov siv hauv cov ntaub ntawv refractory yog siv rau cov hlau tsis huv. Raws li cov cib refractory, Al2O3-SiC-C cib siv rau hauv kev sib xyaw cov tsheb hlau hauv cov hlau tsis huv, thiab silicon carbide cib yog siv rau hauv cov phab ntsa tawg. Ntxiv nrog rau kev tsim cov hlau tsis huv, silicon carbide cib kuj tau siv hauv incinerators.
Deoxidation thiab carbon ntxiv cov ntaub ntawv (hlau, casting, thiab lwm yam)
Lawv feem ntau yog siv rau lub hom phiaj ntawm kev ntxiv carbon, ntxiv silicon, cua sov, thiab deoxidation nyob rau hauv lub ironmaking thiab casting industries. Thaum siv los ua silicon, nws sib tw nrog ferrosilicon, tab sis thaum siv silicon carbide, nws muaj qhov zoo hauv qab no: lub cev zoo (txhim kho tensile zog thiab machinability, thiab lwm yam); tsawg impurities (Al, S, N); Nyob rau hauv cov ntaub ntawv ntawm 90% silicon carbide, cov ntsiab lus silicon yog 63%, thiab cov ntsiab lus C yog hais txog 27%, uas muaj cov pa roj carbon ntxiv nyhuv (tus nqi sib txawv nyob ntawm tus qauv tsim, thiab theoretically, silicon carbide tuaj yeem ntxiv 1. / 3 ntawm cov khoom siv carbon ntxiv). Thaum siv los ua cov pa roj carbon monoxide, nws sib tw nrog cov khoom siv ntxiv cov pa roj carbon monoxide (tsawg carbon ntau dua 90%). Kev siv cov silicon carbide tuaj yeem xav tias yuav txo tau cov nqi.
Cov khoom sib tsoo (granular abrasives, khoom sib tsoo pob zeb)
Silicon carbide muab faib ua dub silicon carbide thiab ntsuab silicon carbide, thiab yog siv los ua raw khoom rau granular abrasives thiab khoom sib tsoo pob zeb.
Ceramics (muab qhov chaw)
Ntxiv nrog rau qhov muaj kev kub ntxhov thiab kev tiv thaiv corrosion, silicon carbide kuj muaj qhov tshwj xeeb rigidity. Raws li kev hloov pauv rau cov hlau (stainless steel, thiab lwm yam), nws tuaj yeem siv rau hauv cov khoom siv semiconductor ntau lawm. Ua kom zoo dua ntawm nws qhov tsis tshua muaj thermal expansion thiab siab rigidity, nws yog siv los ua cov khoom siv rau cov khoom siv ultra-precision positioning. Silicon carbide muaj cov zawv zawg zoo thiab tuaj yeem siv los ua cov khoom sib khi (cov tshuab foob) hauv qhov chaw kub thiab corrosive.
Lim
Nws tuaj yeem siv los ua cov khoom siv lim kom tshem tawm cov pa roj carbon monoxide. Txij li thaum cov khoom raug ntes yuav tsum tau hlawv thiab ntxuav tsis tu ncua, qhov kub thiab txias yog qhov yuav tsum tau ua kom sov, yog li siv silicon carbide.
Filler (exothermic, hnav-resistant, thiab lwm yam)
Nws siv cov yam ntxwv ntawm high thermal conductivity thiab yog siv nyob rau hauv cov ntaub ntawv exothermic. Kev siv tshwj xeeb suav nrog kev ntxiv silicon carbide rau cov hlau thiab cov resins los ua cov khoom sib xyaw thiab ntxiv silicon carbide los txhim kho qhov hnav tsis kam ntawm cov xim pleev xim.
