Uyini umehluko phakathi kwe-reaction bonded ne-sintered silicon carbide?

Uma kukhulunywa nge-silicon carbide ceramics, kunezinhlobo ezimbili eziyinhloko:ukusabela okuboshwe nge-silicon carbidekanye ne-silicon carbide ehlanganisiwe. Nakuba zombili izinhlobo ze-ceramics zinikeza amazinga aphezulu okuqina nokumelana nokugqoka, kunomehluko omkhulu phakathi kokubili.

Ake siqale nge-reaction bonded silicon carbide ceramics. Lezi zobumba ziphakathi kuka-85% no-90% we-silicon carbide futhi aqukethe i-silicon ethile. Ukumelana kwabo okuphezulu kwezinga lokushisa ngu-1380°C. Enye yezinzuzo eziyinhloko zamaceramics e-silicon carbide e-reaction-bonded ukuthi angenziwa ehambisana nosayizi abakhulu kanye nokuma. Lokhu kubenza babe izinto ezifanele zokudala imikhiqizo eyingqayizivele nephrofeshinali. Ukwengeza, i-coefficient ephansi yokunwetshwa kanye nokumelana okuhle kakhulu kokugqoka kwalezi zitsha zobumba kuzenza kube ukukhetha okudumile embonini yesiphepho sezimayini.

I-silicon carbide engenasicindezelo inokuqukethwe okuphezulu kwe-silicon carbide, engafinyelela ngaphezu kwama-99%, futhi ukumelana okuphezulu kwezinga lokushisa ngu-1650°C. I-coefficient ethile yokunwetshwa yethulwa phakathi nenqubo ye-sintering, okwenza i-SiC engenangcindezi ifaneleke ekukhiqizeni izingxenye ze-SiC ezinembayo. Ngenxa yokunemba kwayo okuphezulu, i-silicon carbide engacindezeli ivame ukusetshenziselwa ukwenza isikhunta nezingxenye ezinembayo ezingagugi.

Ngokungeziwe ekubunjweni okunembayo nezingxenye ezigqokile, imishini yokushisa ephezulu yokugcina embonini yamakhemikhali ingathatha ithuba lokumelana nokushisa okuphezulu kwe-silicon carbide engenangcindezi. Kulabo abafuna amashubhu okushintshanisa ukushisa asebenzayo emishini yabo yokucubungula amakhemikhali, i-silicon carbide engenangcindezi iwukukhetha okusebenzayo.

Ngokuvamile, i-reaction bonding kanye ne-sinteringless sintering ye-ceramics ye-SiC, nakuba ngayinye inezinzuzo zayo kanye nebubi bayo, ifanele izimboni nezinhlelo zokusebenza ezahlukene. Uma udinga umkhiqizo ohlukile noma omkhulu ongamelana nokuguga, izitsha zobumba ze-silicon carbide ceramics zingaba yisinqumo esilungile kuwe. Ngezingxenye ezintekenteke kakhulu ezidinga ukumelana namazinga okushisa aphezulu, i-silicon carbide engenangcindezi ingase ibe ukukhetha okungcono. Noma ngabe ukhetha luphi uhlobo lwe-silicon carbide ceramic, ungaqiniseka ukuthi luzokunikeza ukuqina nokusimama okudingwa yiphrojekthi yakho.