Khuluma mayelana ne-reaction sintering silicon carbide processing technology

I-Reaction-sintered silicon carbide porcelain inamandla amahle okucindezela ezingeni lokushisa elizungezile, ukumelana nokushisa ku-oxidation yomoya, ukumelana kahle nokugqoka, ukumelana nokushisa okuhle, i-coefficient encane yokwandisa umugqa, i-coefficient yokudlulisa ukushisa okuphezulu, ukuqina okuphezulu, ukumelana nokushisa nokucekela phansi, ukuvimbela umlilo kanye ezinye izici zekhwalithi ephezulu. Okusetshenziswa kakhulu ezimotweni, ezishintshayo ngomshini, ekuvikelweni kwemvelo kwemvelo, ubunjiniyela be-aerospace, okuqukethwe kolwazi izinto zikagesi, amandla kagesi neminye imikhakha, sekuphenduke izitsha zobumba zesakhiwo ezingabizi nezingenakubuyiseleka emikhakheni eminingi yezimboni.

I-sinterlessless sintering kwaziwa njengendlela ethembisayo yokubala ye-SiC. Emishinini yokuphonsa eqhubekayo ehlukene, i-sintering-free sintering ingahlukaniswa ibe yisigaba esiqinile sokubala kanye nokubala kwesigaba se-liquid sokusebenza okuphezulu. Ngokungeza i-B ne-C efanele (okuqukethwe komoya-mpilo ngaphansi kuka-2%) ndawonye ku-Beta SiC powder ecoleke kakhulu, i-S. Proehazka ifakwe emzimbeni we-SIC calcined enobuningi obuhlobene obungaphezu kuka-98% ngo-2020, ne-Al2O3 ne-Y2O3 njenge izithasiselo. I-Calcined 0.5m-SiC ngaphansi kuka-1850-1950 (i-particle surface ene-SiO2 encane), isiphetho siwukuthi ukuminyana kwe-porcelain ye-SiC kudlula u-95% we-theoretical density eyisisekelo, usayizi wokusanhlamvu mncane, futhi ubukhulu obujwayelekile bukhulu, okuyinto ngi 1.5μm.

I-reactive sintering silicon carbide ibhekisela kuyo yonke inqubo yokubonisa i-billet yesakhiwo esinezimbotshana ezinesigaba soketshezi noma isigaba soketshezi esisebenza kahle, ukuthuthukisa ikhwalithi ye-billet, ukwehlisa imbobo yokukhipha umoya, nokubala umkhiqizo osuphelile ngamandla athile nokunemba kobukhulu. Impushana ye-plutonium-sic kanye ne-graphite yokuhlanzeka okuphezulu kuxutshwa ngesilinganiso esithile futhi kushiselwe cishe ku-1650 ukuze kukhiqizwe umbungu wezinwele. Ngesikhathi esifanayo, ingena noma ingene ensimbi ngesigaba esiwuketshezi esingu-Si, ibonakale nge-silicon carbide ukuze yakhe i-plutonium-sic, futhi ihlanganise nezinhlayiya ezikhona ze-plutonium-sic. Ngemuva kokungeniswa kwe-Si, umzimba we-sintered onemininingwane yokuminyana kanye nosayizi ongapakishiwe ungatholwa. Uma kuqhathaniswa nezinye izindlela sintering, inqubo ukuminyana high ukusabela sintering usayizi uguquko kuncane, kungakha usayizi ofanele wezimpahla, kodwa kukhona SiC eningi emzimbeni calcined, izinga lokushisa eliphezulu izici ukusabela sintered SiC porcelain. kuzoba kubi kakhulu. Izitsha zobumba ze-SiC ezingafakwanga ingcindezi, izitsha zobumba ezishisayo ze-SiC ze-isostatic ezibalwe kanye namaceramic we-Sintered Sintered anezici ezihlukile.

Abakhiqizi be-silicon carbide abasebenzayo abasebenzayo: Isibonelo, i-SiC porcelain ezingeni lokuminyana okulinganiselwe okubaliwe namandla okugoba, ukucindezela okushisayo kwe-sintering kanye nokubala kokucindezela okushisayo kwe-isostatic kungaphezulu, futhi i-SiC ye-reactive sintering iphansi ngokuqhathaniswa. Ngesikhathi esifanayo, izakhiwo ezibonakalayo ze-porcelain ye-SiC ziyashintsha ngokushintsha kwesimo se-calcination. I-non-pressure sintering, i-hot press sintering kanye ne-reaction sintering ye-SiC porcelain inokumelana okuhle ne-alkaline nokumelana ne-asidi, kodwa ukusabela kwe-SiC porcelain okusabelayo kunokumelana okubuthakathaka kwe-HF nokunye ukugqwala kwe-asidi eqine kakhulu. Uma izinga lokushisa lendawo lingaphansi kuka-900, amandla okugoba eningi le-porcelain ye-SiC ephakeme ngokuphawulekayo kunalawo obumba obuqinile obunokushisa okuphezulu, namandla okugoba e-Sintered sintered porcelain ehla kakhulu lapho edlula ku-1400. (Lokhu kubangelwa ukuvela kungazelelwe. ukwehla kwamandla okugoba inani elithile lengilazi elaminethiwe i-Si ngaphezu kwezinga lokushisa elithile emzimbeni obaliwe Ukusebenza okuphezulu kwezinga lokushisa kwezitsha zobumba ze-SiC i-sintered ngaphandle kwe-pressure calcination futhi ngaphansi kwengcindezi ye-static eshisayo eqhubekayo ithinteka kakhulu yizinhlobo zezithasiselo.