Mphamvu ya mineralizers pa katundu wa ceramic zipangizo

Magnesium aluminiyamu spinel(MgAl2O, MgO · Al2Oor MA) ili ndi makina apamwamba kwambiri otenthetsera, kukana bwino kwa peel komanso kukana dzimbiri. Ndiwotentha kwambiri kutentha kwa ceramic mu dongosolo la Al2O-MgO. Kukula kokonda kwa calcium hexaaluminate (CaAl12O19, CaO · 6AlO kapena CA6) njere za krustalo m'mbali mwa ndege yoyambira kumapangitsa kuti ikule kukhala mapulateleti kapena masingano a singano, zomwe zimatha kukulitsa kulimba kwa zinthuzo. Calcium dialuminate(CaAlO kapena CaO · 2Al203, CA2) ili ndi coefficient yotsika ya kukulitsa kutentha. CAz ikaphatikizidwa ndi zida zina zokhala ndi malo osungunuka kwambiri komanso kukulitsa kokwanira, imatha kukana kuwonongeka komwe kumachitika chifukwa cha kutenthedwa kwamafuta. Chifukwa chake, ma composites a MA-CA alandila chidwi chachikulu ngati mtundu watsopano wazinthu zotentha kwambiri za ceramic mumakampani otentha kwambiri chifukwa chazinthu zake zonse za CA6 ndi MA.

Mu pepalali, MA ceramic, MA-CA2-CA zoumba ceramic ndi MA-CA ceramic kompositi zinakonzedwa ndi kutentha olimba-gawo sintering, ndi chikoka cha mineralizers pa katundu wa zinthu zadothi izi anaphunzira. Njira yolimbikitsira opangira ma mineralizer pakugwira ntchito kwa ceramics adakambidwa, ndipo zotsatira zafukufuku zotsatirazi zidapezeka:
(1) Zotsatira zake zidawonetsa kuti kuchuluka kwachulukidwe komanso mphamvu zosinthika za zida za ceramic za MA zidakula pang'onopang'ono ndikuwonjezeka kwa kutentha kwa sintering. Pambuyo sintering pa 1600 kwa 2hthe sintering ntchito MA ceramic anali osauka, ndi kachulukidwe chochuluka cha 3. 17g/cm3 ndi flexural mphamvu mtengo wa133. 31MPa pa. Ndi kuwonjezeka kwa mineralizer Fez03, kuchulukirachulukira kwa zida za ceramic za MA kunakula pang'onopang'ono, ndipo mphamvu yosinthika idayamba kuwonjezeka kenako ndikuchepera. Pamene ndalama zowonjezera zinali 3wt. %, flexural mphamvu inafika pazipita 209. 3MPa.

(2) Masewero ndi gawo la ma ceramic a MA-CA6 amagwirizana ndi kukula kwa tinthu ta CaCO ndi a-AlO zopangira, chiyero cha a-Al2O3, kutentha kwa kaphatikizidwe ndi nthawi yogwira. Pogwiritsa ntchito tinthu tating'onoting'ono CaCO ndi kuyera kwakukulu a-AlzO3 ngati zopangira, mutatha kutentha pa 1600 ℃ ndikugwira kwa 2h, zoumba za MA-CA6 za ceramic zimakhala ndi mphamvu zosinthika kwambiri. Kukula kwa tinthu ta CaCO3 kumagwira ntchito yofunika kwambiri pakupanga gawo la CA ndi kukula ndi kukula kwa mbewu za kristalo mu zida za ceramic za MA-CA6. Pa kutentha kwambiri, zonyansa za Si mu a-Alz0 zimapanga gawo lamadzi losakhalitsa, lomwe limapangitsa kuti morphology ya mbewu za CA6 zisinthe kuchoka ku platelet kupita ku equiaxed.

(3) Zotsatira za mineralizers ZnO ndi Mg(BO2)z pa katundu wa MA-CA composites ndi makina olimbikitsa adafufuzidwa. Zapezeka kuti(Mg-Zn)AI2O4 njira yolimba komanso gawo lamadzi lokhala ndi boron lopangidwa ndi mineralizers ZnO ndi Mg(BO2)z zimapangitsa kukula kwa mbewu za MA kukhala kochepa komanso zomwe zili mu MA zichuluke. Magawo owundanawa amakutidwa ndi tinthu tating'onoting'ono ta ma microcrystalline MA kuti apange matupi obalalika am'madera, zomwe zimapangitsa kusinthika kwa mbewu za CA6 kukhala njere zofananira, motero kumalimbikitsa kachulukidwe wa zida za ceramic za MA-CA ndikuwongolera mphamvu zake zosinthika.

4 Zotsatira za mineralizers SnO₂ ndi HBO pazinthu zakuthupi ndi zamakina, ma microstructure ndi gawo la ma composite adaphunzira.

Zotsatira zikuwonetsa kuti yankho lolimba ndi gawo lamadzimadzi lokhala ndi boroni lokhala ndi nthawi yayitali limawonekera muzinthu za ceramic pambuyo powonjezera mineralizers SnO2 ndi H2BO; motero, zimapangitsa kuti gawo la CA2 lisinthe kukhala gawo la CA ndikufulumizitsa mapangidwe a MA ndi CA6, motero kupititsa patsogolo ntchito ya sintering ya zinthu za ceramic. Gawo lowundana lopangidwa ndi kuchuluka kwa Ca limapangitsa mgwirizano pakati pa mbewu za MA ndi CA6 kukhala zolimba, zomwe zimapangitsa kuti makina aziwoneka bwino.