Impembelelo ye-sintering kwiipropati ze-zirconia ceramics

Impembelelo ye-sintering kwiipropati ze-zirconia ceramics

Njengohlobo lwemathiriyeli ye-ceramic, i-zirconium inamandla amakhulu, ubunzima obuphezulu, ukuxhathisa okulungileyo, ukuxhathisa i-asidi kunye ne-alkali, ukumelana nobushushu obuphezulu kunye nezinye iimpawu ezintle. Ukongeza ekusetyenzisweni ngokubanzi kwintsimi yoshishino, kunye nophuhliso olunamandla lweshishini lamazinyo kwiminyaka yamuva nje, i-zirconias ceramics ibe yeyona nto inokubakho kwaye yatsala ingqalelo yabaphandi abaninzi.

Ukusebenza kwee-ceramics ze-zirconia kuya kuchaphazeleka kwizinto ezininzi, namhlanje sithetha ngempembelelo ye-sintering kwezinye iipropathi ze-zirconia ceramics.

Indlela yeSintering

Indlela yendabuko yokutshisa i-sintering ukufudumeza umzimba ngokusebenzisa ukushisa kwemitha, ukushisa ubushushu, ukushisa ukushisa, ukwenzela ukuba ubushushu buvela kumphezulu we-zirconia ukuya ngaphakathi, kodwa ukuqhutyelwa kwe-thermal ye-zirconia kubi kakhulu kune-alumina kunye nezinye izinto ze-ceramic. Ukuze kuthintelwe ukuqhekeka okubangelwa uxinzelelo lwe-thermal, isantya sokufudumeza kwendabuko sicotha kwaye ixesha lide, okwenza umjikelezo wokuvelisa we-zirconia ubude kunye neendleko zemveliso ziphezulu. Kwiminyaka yakutshanje, ukuphucula iteknoloji processing zirconia, ukunciphisa ixesha processing, ukunciphisa iindleko imveliso, kunye nokubonelela ukusebenza eliphezulu zirconia zamazinyo izinto zeceramic ziye zaba ingqalelo yophando, kunye microwave sintering ngokungathandabuzekiyo sintering indlela ethembisayo.

Kufunyaniswe ukuba i-microwave sintering kunye noxinzelelo lwe-atmospheric sintering ayinamahluko ubalulekileyo kwimpembelelo ye-semi-permeability kunye nokumelana nokunxiba. Isizathu kukuba ukuxinana kwe-zirconia efunyenwe yi-microwave sintering ifana ne-sintering eqhelekileyo, kwaye zombini i-sintering eshinyeneyo, kodwa iingenelo ze-microwave sintering bubushushu obuphantsi be-sintering, isantya esikhawulezayo kunye nexesha elifutshane le-sintering. Nangona kunjalo, iqondo lokunyuka kweqondo lobushushu loxinzelelo lwe-atmospheric sintering licotha, ixesha le-sintering lide, kwaye lonke ixesha le-sintering liqikelelwa kwi-6-11h. Xa kuthelekiswa noxinzelelo oluqhelekileyo lwe-sintering, i-microwave sintering yindlela entsha ye-sintering, enenzuzo yexesha elifutshane le-sintering, ukusebenza kakuhle okuphezulu kunye nokonga amandla, kwaye inokuphucula i-microstructure ye-ceramics.

Abanye abaphengululi bakholelwa ukuba i-zirconia emva kwe-microwave sintering inokugcina inqanaba le-tequartet ye-metastable ngakumbi, mhlawumbi ngenxa yokuba i-microwave ifudumeza ngokukhawuleza inokufikelela uxinaniso olukhawulezayo lwezinto kwiqondo lokushisa eliphantsi, ubungakanani beenkozo buncinci kwaye bufana kakhulu kunobuxinzelelo oluqhelekileyo, olungaphantsi kunelo. ubungakanani benguqu yesigaba esibalulekileyo se-t-ZrO2, ehambelana nokugcina kangangoko kunokwenzeka kwimo ye-metastable kwiqondo lokushisa, ukuphucula amandla kunye nokuqina kwezixhobo ze-ceramic.

Inkqubo ye-sintering kabini

I-compact sintered zirconia ceramics inokucutshungulwa kuphela ngezixhobo zokusika i-emery ngenxa yobunzima obuphezulu kunye namandla, kunye neendleko zokulungisa ziphezulu kwaye ixesha lide. Ukuze kulungiswe ezi ngxaki zingasentla, ngamanye amaxesha zirconia ceramics ziya kusetyenziswa kabini inkqubo sintering, emva kokusekwa umzimba iveramic kunye sintering yokuqala, CAD/CAM amplification machining kwimilo efunwayo, kwaye ke sintering kwiqondo lokugqibela sintering ukwenza. izinto ezixineneyo ngokupheleleyo.

Kufunyenwe ukuba iinkqubo ezimbini ze-sintering ziya kutshintsha i-kinetics ye-sintering ye-zirconia ceramics, kwaye iya kuba nemiphumo ethile kwi-sintering density, i-mechanical properties kunye ne-microstructure ye-zirconia ceramics. Iimpawu zomatshini we-zirconia ceramics esintered kanye xa zixinene zingcono kunezo zifakwe kabini. Amandla okugoba kwe-biaxial kunye nokuqina kokwaphuka kweeseramikhi ze-zirconia ezinokusetyenzwa xa zidibene ziphezulu kunezo zifakwe kabini. Imowudi yokwaphuka kweeseramics ze-sintered zirconia eziphambili yi-transgranular/intergranular, kwaye uqhankqalazo lokuqhekeka luthe tye ngokuthe tye. Imowudi yokwaphuka kweeseramikhi ze-zirconia eziphindwe kabini kukuqhekeka okuphakathi kwegranular, kwaye imeko yokuqhekeka ibuhlungu ngakumbi. Iimpawu zemowudi edibeneyo yokuqhekeka zingcono kunemowudi ye-intergranular fracture elula.

Ivacuum yokucoca

I-Zirconia kufuneka ifakwe kwindawo yokucoca i-vacuum, kwinkqubo yokucoca iya kuvelisa inani elikhulu lamaqamza, kwaye kwindawo ye-vacuum, i-bubbles kulula ukuyikhupha kwimo etyhidiweyo ye-porcelain body, iphucula ukuxinana kwe-zirconia, ngaloo ndlela ukwandisa i-semi-permeability kunye neempawu zemishini ye-zirconia.

Izinga lokufudumala

Kwinkqubo ye-sintering ye-zirconia, ukuze ufumane ukusebenza kakuhle kunye neziphumo ezilindelekileyo, izinga lokushisa eliphantsi kufuneka lamkelwe. Izinga eliphezulu lokufudumala lenza ukushisa kwangaphakathi kwe-zirconia kungalingani xa kufikelela kwiqondo lokugqibela le-sintering, elikhokelela ekubonakaleni kokuqhekeka kunye nokubunjwa kwama-pores. Iziphumo zibonisa ukuba ngokunyuka kwezinga lokufudumeza, ixesha le-crystallization ye-zirconia crystals lifutshane, igesi phakathi kwe-crystals ayikwazi ukukhutshwa, kwaye i-porosity ngaphakathi kwe-zirconia crystals iyanda kancane. Ngokunyuka kwezinga lokufudumala, inani elincinci le-crystal phase monoclinic liqala ukuba khona kwisigaba se-tetragonal se-zirconia, esiya kuchaphazela iimpawu zomatshini. Ngexesha elifanayo, ngokunyuka kwezinga lokufudumala, iinkozo ziya kuba yi-polarized, oko kukuthi, ukuhlalisana kweenkozo ezinkulu kunye ezincinci kulula. Izinga lokufudumeza okucothayo lihambelana nokwakheka kweenkozo ezilinganayo, okwandisa i-semipermeability ye-zirconia.