Inhlanganisela okungeyona i-metallic eyenziwe nge-silicon ne-nitrogen, i-silicon nitride (Si3N4) iphinde ibe yinto ethuthukisiwe ye-ceramic enengxube ekwazi ukuzivumelanisa nezimo kakhulu yezakhiwo zemishini, ezishisayo, nezikagesi. Ukwengeza, uma kuqhathaniswa nezinye izitsha zobumba, iyi-ceramic esebenza kakhulu ene-coefficient ephansi yokwandisa okushisayo enikeza ukumelana nokushaqeka okuhle kakhulu.
Izici
Ngenxa ye-coefficient yayo ephansi yokwandisa okushisayo, impahla inokumelana nokushaqeka okuphezulu kakhulu nokuqina okuhle kokuphuka. Ama-workpiece e-Si3N4 ayizweli imithelela nokushaqeka. Lezi zinto zokusebenza zingabekezelela amazinga okushisa afika ku-1400 °C futhi amelana namakhemikhali, imithelela eyonakalisayo, nezinsimbi ezithile ezincibilikisiwe njenge-aluminium, kanye nama-acid nezisombululo ze-alkaline. Esinye isici ukuminyana kwayo okuphansi. Inobukhulu obuphansi obungu-3.2 ukuya ku-3.3 g/cm3, ecishe ilingane ne-aluminium (2.7 g/cm3), futhi inamandla amakhulu okugoba angu-≥900 MPa.
Ngaphezu kwalokho, i-Si3N4 ibonakala ngokumelana okuphezulu nokugqokwa futhi idlula izici zezinga lokushisa eliphezulu zezinsimbi eziningi, njengamandla ezinga lokushisa eliphezulu nokumelana nokunyakaza. Inikeza ukuxutshwa okuphakeme kokumelana nokukhasa kanye ne-oxidation futhi idlula amandla okushisa aphezulu eningi lezinsimbi. Ngenxa ye-conductivity yayo yokushisa ephansi kanye nokumelana nokugqoka okuqinile, ingakwazi ukumelana nezimo ezinzima kakhulu ekusetshenzisweni kwezimboni ezidinga kakhulu. Ngaphezu kwalokho, i-silicon nitride iyinketho enhle uma amandla okushisa aphezulu nawokulayisha edingeka.
Izakhiwo
● Ukuqina kokuphuka okuphezulu
● Amandla amahle okuguquguquka
● Ukuminyana okuphansi kakhulu
● Ukumelana nokushaqeka okunamandla okumangalisayo
● Izinga lokushisa eliphezulu lokusebenza ku-oxidizing atmospheres
Indlela Yokukhiqiza
Izinqubo ezinhlanu ezihlukahlukene ezisetshenziselwa ukwenza i-silicon nitride—ziholela ezintweni zokusebenza ezihluke kancane kanye nezinhlelo zokusebenza.
I-SBRSN (i-silicon nitride ehlanganisiwe)
I-GPSN (i-gas pressure sintered silicon nitride)
I-HPSN (i-silicon nitride ecindezelwe ngokushisayo)
I-HIP-SN (i-silicon nitride ecindezelwe ngokushisayo)
I-RBSN (i-silicon nitride esabelayo)
Phakathi kwalezi ezinhlanu, i-GPSN iyindlela evame ukusetshenziswa kakhulu yokukhiqiza.
Izibonelo Zohlelo Lokusebenza
Amabhola kanye nezinto ezigingqayo zokukhanya
Ngenxa yokuqina kwawo okukhulu kokuphuka kanye nezakhiwo ezinhle ze-tribological, izitsha zobumba ze-silicon nitride zifaneleka kahle ukusetshenziswa njengamabhola nezinto ezigingqikayo zokukhanya, amabheringi anembe kakhulu, amathuluzi okwakha i-ceramic esindayo, kanye nezingxenye zezimoto ezigcizelelwe kakhulu. Ukwengeza, amasu okushisela asebenzisa ukumelana nokushaqeka okushisayo okuqinile kanye nokumelana nezinga lokushisa eliphezulu.
Izinhlelo Zezinga Lokushisa Eziphezulu
Ngaphandle kwalokho, sekuyisikhathi eside isetshenziswa ezinhlelweni zokushisa okuphezulu. Iqiniso lokuthi ingenye yezinto ezimbalwa ze-ceramic ze-monolithic ezingamelana nokushaqeka okushisayo okwedlulele kanye nama-gradients okushisa akhiqizwa yi-hydrogen/oxygen rocket engines.
Imboni Yezimoto
Njengamanje, impahla ye-silicon nitride isetshenziswa ikakhulukazi embonini yezimoto ekusetshenzisweni kwezingxenye zenjini kanye namayunithi ezinsiza zenjini, njengama-turbocharger e-inertia ephansi kanye nokuncishiswa kwenjini kanye nokukhipha umoya, amapulagi akhanyayo okuqalisa ngokushesha, ama-valve okulawula igesi akhipha igesi ukuze asheshise, namaphedi engalo ye-rocker agqoke izinjini zegesi ukuze zehlise.
Imboni Yezogesi
Ngenxa yezakhiwo zayo zikagesi ezihlukile, ezinhlelweni ze-microelectronics, i-silicon nitride isetshenziswa ngokuya isetshenziswa njengesivikelo nesivimbeli samakhemikhali ekukhiqizeni amasekethe ahlanganisiwe wokupakishwa okuphephile kwamadivayisi. I-Silicon nitride isetshenziswa njengesendlalelo se-passivation esinesithiyo esiphezulu sokusabalalisa ngokumelene nama-ion e-sodium namanzi, okuyizimbangela ezimbili eziyinhloko zokugqwala nokungazinzi kuma-microelectronics. Kuma-capacitor amadivayisi e-analog, into iphinde isetshenziswe njengesivikeli sikagesi phakathi kwezendlalelo ze-polysilicon.
Isiphetho
I-silicon nitride ceramics izinto eziwusizo. Uhlobo ngalunye lwale ceramic lunezici ezihlukile ezilwenza lusebenziseke emikhakheni ehlukahlukene. Ukuqonda izinhlobo eziningi ze-silicon nitride ceramics kwenza kube lula ukukhetha engcono kakhulu yohlelo olunikeziwe.
