Ukuqina okuPhezulu kwizicelo zoShishino

Zirconia Toughened Alumina (ZTA) Amacandelo e-ceramic adibanisa ukuqina kunye namandla e-alumina kunye nokuqina kwe-zirconia ephezulu yokuphuka ukuhambisa ukusebenza kunye nokuphila ixesha elide kwizicelo zemizi-mveliso..

Utshintsho olubangelwa luxinzelelo lwe-tetragonal zirconia ezincinci ezifakwe ngaphakathi kwe-alumina matrix zikhokelela kwizinto ze-ZTA ezinamandla aphezulu kunye nokuqina., ilungele ukusetyenziswa kwiindawo ezahlukeneyo ezinzima.

Ukuqina

Izinto ze-ZTA zidibanisa ubulukhuni be-alumina kunye nokuqina kwe-zirconia yokuchasana okungenakulinganiswa kokunxiba kunye nokukrala. Esi siphumo senziwe ukuba sibe nokwenzeka ngoxinzelelo-olunyanzeliswa ukuguqulwa kwenguqu: xa ucinezelekile, i-zirconia particles inguqu kwisigaba sabo se-metastable tetragonal kwifom ye-monoclinic ezinzileyo; Ukwandiswa komthamo okubangelwa lolu tshintsho lwesakhiwo kunceda ukuvala naziphi na iintanda ngaphakathi kwe-alumina matrix kunye nokwandisa ukuqina kakhulu..

I-ZTA iqulethe iiplatelet ze-zirconia ezithatha i-nucleate kwi-alumina matrix ngexesha le-sintering, ukuphucula ukuqina kwe-fracture kunye namandla ngelixa ukwandisa ukuqina kwe-fracture, ukudala imathiriyeli enamandla amakhulu okuguquguquka kune-Y-TZP kwaye ukuya kuthi ga kabini amandla ayo okudinwa komjikelo. Oku kudityaniswa kokuqina okuvela kwi-alumina kudityaniswe namandla e-zirconia kwenza i-ZTA ibe yinto ebalaseleyo yokukhetha usetyenziso lwemizi-mveliso efuna ukumelana nomonakalo..

Ukuqina

Zirconia Toughened Alumina (ZTA) Unamandla abalaseleyo okuguquguquka kunye nokucinezela, kunye nokwandiswa kwe-thermal ephantsi elingana ne-alumina kunye neempawu ezibalaseleyo zokumelana nokunxiba.

I-Zirconia eqinile i-alumina idalwe ngokongeza iinkozo ze-tetragonal zirconia ngokuguqulwa koxinzelelo-olunyanzeliswa kwi-alumina matrix enzima., iwagqume kulwakhiwo lwawo ngelixa ithintela inguqu yawo kwiindawo zasekhaya endaweni yokusasazeka kuyo yonke indawo.

Lo matshini wenza imidibaniso ye-alumina-zirconia yomelele ngakumbi kune-monolithic zirconia ngenxa yokumelana nokufunxwa kwamanzi nge-chemisorption.; I-monolithic zirconia inokufunxa iimolekyuli zamanzi epolar ezikhokelela ekuthotyweni kobushushu obuphantsi kwaye ekugqibeleni ukonakala emva kokusetyenziswa kwexesha elide..

ZTA, kwelinye icala, yenzelwe ngokukodwa ukuququzelela le nguqu ye-tetragonal-to-monoclinic ngokusebenzisa iimpawu zesakhiwo kunye nezongezo zekhemikhali.. I-CeramTec ithengisa i-Biolox Delta ZTA njengomzekelo; olu qulunqo luqulethe i-yttria kunye ne-strontium aluminate ukuququzelela iindlela zokuqina ngaphakathi kwesigaba sayo se-zirconia kwaye ngenxa yoko inomngcipheko omncinci wokuthotywa kobushushu obuphantsi ngelixa imelana nobushushu obuphezulu..

Ukunyangwa kokuMhlwa

Iiceramics ze-ZTA zibonelela ngokuxhathisa kokugqwala okuphezulu ngaphezulu kwe-alumina esebenza nabo kwaye ke ngoko inokusetyenziswa kwizixhobo eziphantsi kobume bemeko erhabaxa.. Ngaphaya koko, I-ZTA inokumelana namaqondo obushushu aphezulu ngelixa inikezela ngozinzo olukhulu lweekhemikhali.

Garvie et al (1975) wabonisa ukuba ukongeza 10-20% i-zirconia engazinzanga inokuphucula kakhulu ukuqina xa kuthelekiswa ne-alumina, ngokuguqulwa kokuqina. Le nkqubo yenzeka xa i-tetragonal metastable precipitates ehlakazeke kakuhle itshintsha ibe yi-monoclinic zirconia phantsi koxinzelelo olubangela ukwanda kwevolumu ecinezela iintanda kwaye icothe okanye iyeke ukwanda kwayo..

Lo matshini ufana noxinzelelo olubangelwa yi-deformation; nangona kunjalo, ukuze kubangele utshintsho lwesigaba intsimi yoxinzelelo kufuneka ibe nkulu ngokwaneleyo; kwiintanda kwisampulu ze-ZTA la mandla avela kuxinzelelo lokugoba kwiindawo zokwaphuka.

Ukumelana nobushushu

I-Zirconia Toughened Alumina inendawo yokunyibilika ephezulu kakhulu kunye nokumelana nomhlwa, ukuyenza ibe yeyona nto ifanelekileyo kwisixhobo esihlala sivezwe kumaqondo obushushu aphezulu. Ngaphaya koko, le yantlukwano inoxhathiso olukhulu kune-alumina eqhelekileyo, ukunceda ukunciphisa ukuguga kunye nokukrazula kwizixhobo ezivezwe kumanqanaba aphezulu amandla e-kinetic.

Iiseramics ze-ZTA zenziwe ngoxinzelelo-olunyanzeliswa utshintsho lwamasuntswana e-tetragonal zirconia kwi-alumina matrix., ukudala uxinzelelo olucinezelayo ngaphakathi kwabo oluthintela ukwanda kwe-crack, ukwandisa amandla kunye nokuqina ngelixa unikezela ukuxhathisa ukothuka kwe-thermal ngaphandle kokwaphuka okanye ukuqhekeka. Baqhayisa ngokuxhathisa ukothuka kwe-thermal; ukumelana nokutshintsha ngokukhawuleza kweqondo lokushisa ngaphandle kokuphuka okanye ukuqhekeka phantsi koxinzelelo.

I-alumina eqinile yeZirconia inosetyenziso oluninzi kumashishini amaninzi ngenxa yeepropathi zayo ezininzi. Ubunjineli boomatshini bubusebenzisela amacandelo epompo kunye netywina; ukusetyenzwa kwe-semiconductor kuyisebenzisa ngenxa yozinzo kunye namandla ayo obushushu; i-aerospace, Imizi-mveliso yeemoto kunye namandla iyisebenzisa njengenxalenye yenjini ngenxa yokunganyangeki kwayo ngokuchasene nokubola kunye neekhemikhali ezinoburharha.; inokumelana namandla aphezulu okuguquguquka kokufakelwa kwamazinyo!