Engineering ceramics
Engineering ceramics, tseem hu ua silicon nitride ceramics lossis siab zog ceramics, yog ua los ntawm silicon hmoov ua cov khoom siv raw los ntawm ob txheej txheem, cov tshuaj tiv thaiv sintering thiab kub nias. Nws muaj yuav luag txhua qhov zoo ntawm niaj hnub ceramic tsev neeg, lub zog yog feem ntau siab, nws muaj qhov tsis tshua zoo hnav tsis kam thiab tshuaj corrosion tsis kam, thiab nws tseem yog cov hluav taws xob zoo hluav taws xob insulating khoom.
Qhov zoo ntawm engineering ceramics
siab lub zog
Engineering ceramics muaj yuav luag txhua qhov zoo ntawm cov tsev neeg niaj hnub, thiab lawv lub zog yog qhov siab heev, tshwj xeeb tshaj yog rau kub-nias silicon nitride, chav kub khoov lub zog yog feem ntau nyob hauv thaj tsam ntawm 8000 ～ 10000 kg / cm2. Yog tias koj ntxiv yttrium oxide thiab alumina kub-nias silicon nitride, chav tsev kub khoov lub zog tuaj yeem ncav cuag 15000 kg / cm2, ua kom lub zog ntawm cov khoom siv ceramic tshaj li 10,000 kg cim, uas tuaj yeem hais tau hauv cov ntaub ntawv ceramic Nws yog qhov zoo tshaj plaws Cov. Nws kuj yog qhov nyuaj heev thiab yog ib yam khoom nyuaj tshaj plaws hauv ntiaj teb. Nws muaj peev xwm tiv taus ntau rau qhov kub thiab txias thiab tsis yaj rau hauv cov kua thaum rhuab, tab sis tsis xau rau hauv silicon thiab nitrogen kom txog thaum 1900 ° C. Nyob rau tib lub sijhawm, muaj peev xwm tiv nrog kev hloov ceev ntawm qhov txias thiab cua sov kuj yog qhov zoo heev. Thaum lawv cia li kub siab los ntawm chav tsev kub mus rau qhov kub siab tshaj li 1,000 degrees, thiab tom qab ntawd mam li muab pov rau hauv dej, lawv yuav tsis tawg. Vim li no, lawv tsim nyog tshaj plaws rau kev tsim cov khoom lag luam high-temperature gas turbine blades. , Siab kub crucible, thiab lwm yam Vim tias nws lub siab tawv, nws yog siv los ua cov hlau txiav cov cuab yeej, txawm tias muaj qhov sib txhuam sai thiab kub siab yuav tsis muag lossis oxidize, yog li nws tsim nyog rau kev kub ceev thiab txiav xws li tej kas tham, nres lub tog raj kheej thiab lwm yam nyuaj Qhov zoo ntawm cov hlau. Nws tuaj yeem ua tau tej yam uas cov hlau tuaj yeem' t ua. Kev siv cov roj silicon nitride ceramics kom cov roj turbine turbine blades muaj cov kev siv ntau yam. Vim tias cov roj turbine yog lub tshuab hluav taws xob tseem ceeb, nws tau siv dav hlau dav hlau, chaw nres tsheb fais fab, hauv lub nroog thiab cov tsheb thauj khoom.
Hnav thiab corrosion tsis kam
Engineering ceramics muaj zoo hnav tsis kam thiab tshuaj tiv thaiv corrosion, thiab yog cov ntaub ntawv zoo rau kev tsim cov khoom siv ntau yam-corrosion. Nws tuaj yeem tiv thaiv yuav luag txhua cov kua qaub inorganic (tshwj tsis yog hydrofluoric acid) thiab caustic sis dej qab kua hauv qab 30%. Nws tseem tiv taus ntawm kev yaig ntawm ntau cov organic. Nws tseem tiv taus corrosion los ntawm ntau cov hlau tsis-ferrous hlau, tshwj xeeb tshaj yog molten txhuas. Aluminium kua yog tsis-ntub mus rau silicon nitride, yog li tsis muaj kev pheej hmoo ntawm kev sib kis los ntawm kev siv nws los ua cov qauv txheej txheem uas hu rau kua txhuas.
rwb thaiv tsev
Silicon nitride ceramics kuj yog cov khoom siv hluav taws xob zoo insulating, thiab nws cov hluav taws xob insulating zog tuaj yeem piv nrog alumina ceramics. Nws tseem muaj microwave permeability thiab tuaj yeem siv ua lub radome. Nws lub zog dielectric hloov me me nrog rau qhov kub thiab txias, thiab siv tau mus txog 550 ° C ntawm qhov kub. Nws lub zog thermal poob siab yog qhov zoo dua nyob hauv txhua yam ntawm lub ceramics, uas ua rau nws siv tau ntawm rau Mach (uas yog, rau lub sijhawm ntawm lub suab ntawm lub suab), lossis txawm tias ntawm lub nrawm ntawm xya Mach.
