Umusemburo wa aluminium ya manyeziyumu (MgAl2O, MgO·Al2Oor MA) ufite ubushobozi bwo hejuru mu bushyuhe bwinshi, urwanya cyane gushwanyagurika no kurwanya ingese. Ni ceramic isanzwe ikoreshwa mu bushyuhe bwinshi muri sisitemu ya Al2O-MgO. Ikura ryihariye rya calcium hexaaluminate (CaAl12O19, CaO·6AlO cyangwa CA6) ku gice cy'ibanze gituma ikura ikaba platelets cyangwa imiterere y'urushinge, bishobora kongera cyane ubukomere bw'ibikoresho. Calcium dialuminate (CaAlO cyangwa CaO·2Al203, CA2) ifite ikigereranyo gito cyo kwaguka k'ubushyuhe. Iyo CAz ivanze n'ibindi bikoresho bifite aho bishongesha cyane kandi ikigereranyo kinini cyo kwaguka, ishobora kwihanganira kwangirika guterwa n'ihungabana ry'ubushyuhe. Kubwibyo, imiterere ya MA-CA yibanzweho cyane nk'ubwoko bushya bw'ibikoresho bya ceramic bikoresha ubushyuhe bwinshi mu nganda zikoresha ubushyuhe bwinshi kubera imiterere yayo yuzuye ya CA6 na MA.
Muri iyi nyandiko, ibinyabutabire bya MA ceramic, MA-CA2-CA ceramic composites na MA-CA ceramic composites byateguwe hakoreshejwe sintering y’ubushyuhe bwinshi, kandi ingaruka z’ibinyabutabire ku miterere y’ibi bikoresho bya ceramic zarasuzumwe. Uburyo bwo gushimangira ibinyabutabire ku mikorere ya ceramic bwaganiriweho, kandi ibisubizo bikurikira byabonetse mu bushakashatsi:
(1) Ibisubizo byagaragaje ko ubucucike bw'ibikoresho bya MA ceramic byariyongereye buhoro buhoro uko ubushyuhe bwo gushonga bwazamukaga. Nyuma yo gushonga kuri dogere 1600 mu masaha 2, imikorere ya MA ceramic yari mibi, ubwo ubucucike bwa 3.17g/cm3 n'imbaraga zo gushonga za 133.31MPa. Ubwo mineralizer Fez03 yiyongeraga, ubucucike bw'ibikoresho bya MA ceramic bwariyongereye buhoro buhoro, kandi imbaraga zo gushonga zariyongereye mbere hanyuma zikagabanuka. Iyo umubare w'inyongera wari 3wt. %, imbaraga zo gushonga zageze kuri 209.3MPa ntarengwa.
(2) Imikorere n'imiterere y'icyiciro cya MA-CA6 ceramic bifitanye isano n'ingano y'utunyangingo twa CaCO na a-AlO fatizo, ubuziranenge bwa a-Al2O3, ubushyuhe bwo gukora hamwe n'igihe cyo kuyifata. Hakoreshejwe CaCO fatizo ntoya hamwe n'ubuziranenge bwinshi bwa a-AlzO3 nk'ibikoresho fatizo, nyuma yo gutwika kuri 1600℃ no kuyifata amasaha 2, ceramic ya MA-CA6 fatizo ifite imbaraga nyinshi zo kuyihindura. Ingano y'utunyangingo twa CaCO3 igira uruhare runini mu ishyirwaho rya CA phase no gukura no guteza imbere utunyangingo twa kristu mu bikoresho bya MA-CA6 fatizo. Iyo ubushyuhe buri hejuru, ubuziranenge bwa Si muri a-Alz0 buzaba igice cy'amazi cy'igihe gito, gituma imiterere y'utunyangingo twa CA6 ihinduka kuva kuri platelets ikagera kuri equiaxed.
(3) Ingaruka z'ibinyabutabire bya ZnO na Mg (BO2) z ku miterere y'ibinyabutabire bya MA-CA n'uburyo bwo kubikomeza zarasuzumwe. Byagaragaye ko igisubizo gikomeye cya (Mg-Zn) AI2O4 n'igice cy'amazi kirimo boron cyakozwe n'ibinyabutabire bya ZnO na Mg (BO2) z bituma ingano y'ingano ya MA iba nto kandi ingano ya MA ikongera. Ibi bice by'ubucucike bitwikiriwe n'uduce twa MA duto kugira ngo bikore ibice by'ubucucike mu turere dutandukanye, bigatuma uduce twa CA6 duhinduka uduce duto, bityo bigateza imbere ukwiyongera kw'ibikoresho bya MA-CA mu isanzure no kunoza imbaraga zabyo zo kuzunguruka.
(4) Hakoreshejwe Al2O idasesenguye neza mu buryo bw'isesengura aho gukoresha a-AlzO, ibirungo bya MA-CA2-CA byakozwe mu bikoresho fatizo bidasesenguye neza mu buryo bw'isesengura. Ingaruka z'ibirungo bya SnO₂ na HBO ku miterere y'ibintu bifatika n'iy'ikoranabuhanga, imiterere mito n'imiterere y'ibirungo byifashishijwe mu buryo bw'isesengura byizweho.
Ibisubizo bigaragaza ko umuti ukomeye n'igice cy'amazi gisanzwe kirimo boron bigaragara mu bikoresho bya ceramic nyuma yo kongeramo mineralizers SnO2 na H2BO; uko bikurikirana, bituma igice cya CA2 gihinduka kikajya ku gice cya CA kandi kikihutisha ikorwa rya MA na CA6, bityo bikanoza imikorere y'ibikoresho bya ceramic. Igice cy'ubucucike bukorwa n'ibice byinshi bya Ca gituma isano iri hagati y'ibinyampeke bya MA na CA6 ikomera, ibi bikaba binoza imiterere y'ibikoresho bya ceramic.
Igihe cyo kohereza: Kanama-29-2023