Ukuqina Okuthuthukile Kwezicelo Zezimboni

Zirconia Toughened Alumina (I-ZTA) izingxenye ze-ceramic zihlanganisa ubulukhuni namandla e-alumina kanye nokuqina kwe-zirconia ephakeme kakhulu yokuphuka ukuletha ukusebenza nokuphila isikhathi eside kwezicelo zezimboni..

Ukuguqulwa okubangelwa ukucindezeleka kwezinhlayiya ezinhle ze-tetragonal zirconia ezishumekwe ngaphakathi kwe-alumina matrix kuholela ezintweni ze-ZTA ezinamandla aphezulu kanye nokuqina., ilungele ukusetshenziswa ezindaweni ezihlukahlukene ezinokhahlo.

Ukuqina

Izinto ze-ZTA zihlanganisa ubulukhuni be-alumina kanye nokuqina kwe-zirconia yokumelana okungenakuqhathaniswa nokugqoka nokuhuzuka. Lo mphumela wenziwa ube nokwenzeka ngokuguqulwa kokucindezeleka okubangelwa ukucindezeleka: lapho ecindezelekile, izinhlayiya ze-zirconia zishintsha kusukela esigabeni sazo se-metastable se-tetragonal zibe ifomu elizinzile le-monoclinic; ukwanda kwevolumu okubangelwa yilolu shintsho lwesakhiwo kusiza ukuvala noma yikuphi ukuqhekeka ngaphakathi kwe-alumina matrix futhi kwandise ukuqina kakhulu..

I-ZTA iqukethe ama-platelet e-zirconia angena ku-alumina matrix ngesikhathi sokushisa, ukuthuthukisa ukuqina namandla okuphuka ngenkathi kukhulisa ukuqina kokuphuka, ukudala into enamandla amakhulu okuguquguquka kune-Y-TZP futhi ifike ngokuphindwe kabili amandla ayo okukhathala okujikelezayo. Le nhlanganisela yokuqina okuvela ku-alumina ehlanganiswe namandla e-zirconia yenza i-ZTA ibe yinhle kakhulu ukukhetha kwezinto ezisetshenziswayo ezimbonini ezidinga ukumelana nomonakalo..

Ukuqina

Zirconia Toughened Alumina (I-ZTA) inamandla avelele aguquguqukayo nacindezelayo, ngokunwebeka okushisayo okuphansi okulingana nalokho kwe-alumina kanye nezakhiwo ezivelele zokumelana nokugqoka.

I-alumina eqinile ye-Zirconia idalwe ngokungeza izinhlamvu ze-tetragonal zirconia ngokuguqulwa okubangelwa ukucindezeleka ku-alumina matrix eqinile., ukuwafaka esakhiweni sawo ngenkathi ekhawulela ukuguqulwa kwawo ezindaweni zendawo esikhundleni sokusabalala kuyo yonke indawo.

Lo mshini wenza izinhlanganisela ze-alumina-zirconia ziqine kakhulu kune-monolithic zirconia ngenxa yokumelana kwazo nokumuncwa kwamanzi nge-chemisorption.; I-monolithic zirconia ingakwazi ukumunca ama-molecule wamanzi we-polar okuholela ekuwohlokeni kwezinga lokushisa eliphansi futhi ekugcineni aphule ngemva kokusetshenziswa isikhathi eside..

I-ZTA, Ngokolunye uhlangothi, yakhelwe ngokukhethekile ukusiza lolu shintsho lwe-tetragonal-to-monoclinic ngokusebenzisa izici zesakhiwo kanye nezithasiselo zamakhemikhali.. I-CeramTec imaketha i-Biolox Delta ZTA njengesibonelo; lokhu kwakhiwa kuqukethe i-yttria ne-strontium aluminate ukuze kube lula izindlela zokuqinisa ngaphakathi kwesigaba sayo se-zirconia futhi ngenxa yalokho kunengozi encane yokuwohloka kwezinga lokushisa eliphansi kuyilapho ukumelana nezimo zokushisa eziphezulu..

Ukumelana Nokugqwala

Izitsha zobumba ze-ZTA zinikeza ukumelana nokugqwala okuphezulu ngaphezu kozakwabo be-alumina ngakho-ke zingasetshenziswa emishinini engaphansi kwezindawo ezinokhahlo.. Ngaphezu kwalokho, I-ZTA ingamelana namazinga okushisa aphezulu kuyilapho inikeza ukuqina okukhulu kwamakhemikhali.

Garvie et al (1975) wabonisa lokho kwengeza 10-20% i-zirconia engazinzile ingathuthukisa kakhulu ukuqina uma kuqhathaniswa ne-alumina, ngokusebenzisa ukuguqulwa kokuqina. Le nqubo yenzeka lapho i-tetragonal metastable precipitates ehlakazeke kahle ishintsha ibe yi-monoclinic zirconia ngaphansi kwengcindezi ebangela ukwanda kwevolumu ecindezela imifantu futhi ibambezele noma imise ukusakazeka kwayo..

Lo mshini ufana nengcindezi edalwa yi-deformation; nokho, ukuze kubangele izinguquko zesigaba insimu yokucindezeleka kufanele ibe nkulu ngokwanele; ngokuqhekeka kwezibonelo ze-ZTA la mandla avela ekugobiseni kwezindawo zokuphuka.

Ukumelana Nokushisa

I-Zirconia Toughened Alumina inephuzu lokuncibilika eliphakeme kakhulu kanye nokumelana nokugqwala, okwenza kube yinto ekahle yezinto zokusebenza ezivame ukuchayeka emazingeni okushisa aphezulu. Ngaphezu kwalokho, lokhu okuhlukile kunokumelana okukhulu nokungqubuzana kune-alumina evamile, ukusiza ukunciphisa ukuguga kwezinto zokusebenza ezivezwe kumazinga aphezulu wamandla e-kinetic.

Izitsha zobumba ze-ZTA zenziwa ngokuguqulwa okubangelwa ukucindezeleka kwezinhlayiya ze-tetragonal zirconia zibe i-alumina matrix., ukudala izingcindezi ezicindezelayo ngaphakathi kwazo ezivimbela ukusakazeka kokuqhekeka, ukwandisa kokubili amandla nokuqina ngenkathi inikeza ukumelana nokushaqeka okushisayo ngaphandle kokuphuka noma ukuqhekeka. Baziqhayisa kahle kakhulu ukumelana nokushaqeka okushisayo; ukumelana nezinguquko ezisheshayo ekushiseni ngaphandle kokuphuka noma ukuqhekeka ngaphansi kokucindezeleka.

I-Zirconia-toughened alumina inemisebenzi eminingi kuzo zonke izimboni eziningi ngenxa yobuningi bezakhiwo zayo. Ubunjiniyela bemishini busebenzisela izingxenye zephampu kanye nezimpawu; ukucutshungulwa kwe-semiconductor kuyisebenzisa ngenxa yokuqina kwayo okushisayo namandla; i-aerospace, izimboni zezimoto namandla ziyisebenzisa njengezingxenye zenjini ngenxa yokumelana nokugqwala namakhemikhali anokhahlo.; ingamelana namandla aphezulu okuguquguquka okufakelwa kwamazinyo!