Ngawaphi amanqanaba amathathu awohlukeneyo okuntywila kwiiseramikhi zealumina? I-Sintering yeyona nkqubo iphambili yayo yonke i-alumina ceramics kwimveliso, kwaye utshintsho oluninzi olwahlukileyo luya kwenzeka ngaphambi nasemva kokucwiliswa, oku kulandelayo uXiaobian uya kugxila kumanqanaba amathathu awohlukeneyo e-alumina ceramics:
Okokuqala, ngaphambi kokuba sintering, ulawulo lobushushu kweli nqanaba libaluleke ngakumbi, kuba ubushushu buyaqhubeka nokunyuka, umbungu uya kuncipha, kodwa amandla kunye noxinaniso akuyi kutshintsha kakhulu, ukuba i-microscopic, ingqolowa ayiyi kutshintsha ngobukhulu. , kodwa i-embryo kweli nqanaba ithandeka ngakumbi kwi-crack phenomenon, Ikakhulu ngenxa yokuba i-binder kunye namanzi zikhutshwe ngokupheleleyo, ngoko kufuneka sinikele ingqalelo kwisantya sokunyuka kobushushu.
Okwesibini, kwinkqubo ye-sintering, ubushushu buya kutshintsha i-amplitude encinci, umzimba we-embryo uyancipha ngokuthe ngcembe, kwaye ubuninzi buya kutshintsha kakhulu. Nangona kungekho tshintsho olucacileyo kwiinkozo ezincinci, zonke iinqununu azisayi kubanjwa, kwaye i-pores yonke iya kuba yincinci kwaye incinci. Ngokufanayo, ngenxa yokuba umzimba we-embryo unokutshintsha kwevolumu, ngoko ke kuselula ukuvela kwi-deformation kunye ne-crack phenomenon.
Okwesithathu, ekugqibeleni, emva kokushisa, iqondo lokushisa liya kunyuka kakhulu, umzimba we-embryo kunye nokuxinana kuya kubakho utshintsho olukhulu kakhulu, utshintsho lwengqolowa kwi-micro luyabonakala ngakumbi, i-pores iya kuba yincinci, ukwakheka kweepores ezininzi ezizimeleyo, kodwa kuya kubakho iipores ezishiyekileyo ngokuthe ngqo kwiinkozo.
Ixesha lokuposa: Sep-18-2023