Yandisa ukuqina kunye neZirconia eziQinisekileyo zeAlumina Components

Iiseramikhi ze-ZTA zibonelela ngeempawu eziphezulu ze-tribological xa zithelekiswa neeseramikhi zealumina eziqhelekileyo, ukubenza babe lolona khetho lufanelekileyo lwezixhobo zokusika, iibheringi, iimpompo kunye namacandelo olawulo lwe-fluid.

Ngaphantsi koxinzelelo, i-zirconia particles shift from metastable tetragonal crystal structures ukuya kwi-monoclinic, ukuvelisa ukwanda kwevolumu ecinezela iintanda kwi-alumina matrix kunye nokuphucula kakhulu ukuqina kwe-fracture.

Nxiba ukuxhathisa

Zirconia Toughened Alumina (ZTA) sisixhobo esomeleleyo kakhulu. Inokumelana nempembelelo ye-abrasion okanye ukunxitywa kwefriction ngaphandle komonakalo; iyenza ibe lukhetho oluhle kakhulu lwezinto zokusika amavili. Ngaphaya koko, I-ZTA inokumelana namaqondo obushushu aphezulu ngaphandle kokonakala okanye ukuthotywa.

I-ZTA ixhathisa kakhulu kukonakala kweekhemikhali, ukuyenza ibe lukhetho olugqwesileyo lwezinto eziphathekayo zokufakelwa kwezonyango. I-Biocompatible kwaye iyakwazi ukumelana nokudibana nolwelo lomzimba, I-ZTA ikwaqhayisa ngamandla aphezulu okuguquguquka – igqibelele kwizicelo zokutshintshwa kwe-hip.

I-ZTA yenziwa ngotshintsho olubangelwa luxinzelelo lwamasuntswana alungileyo e-tetragonal zirconia abe yimo yemonoclinic.. Oku kwandisa ukuqina kokwaphuka ngokwandisa indawo ejikeleze iintanda. Njenge, I-ZTA ingqina ukuba yomelele kwaye yomelele ngakumbi kune-alumina kwizicelo zokunxiba.

Ukunyangwa kokuMhlwa

Zirconia Toughened Alumina (ZTA) yimathiriyeli yeceramic ephucukileyo esetyenziswa kakhulu kushishino ngokomelela kwayo, ubunzima, ukunxiba ukuxhathisa kunye neempawu zokumelana nokubola. I-ZTA ifumana izicelo kuwo wonke amacandelo amaninzi abandakanya iimoto kunye ne-aerospace yamacandelo afana ne-injini, iiinjini zegesi kunye namalungu oomatshini ngelixa esebenza njengezinto zokunxiba kwiimpompo, amatywina kunye nezixhobo zokusika ezisetyenziselwa ukusetyenziswa komatshini. Utyando lwezonyango lusenokusebenzisa esi sixhobo ngenxa yokuhambelana kwayo nendalo.

Ukuqina kwesi sixhobo sivela kwinkqubo yokutshintsha okubangelwa uxinzelelo, apho amasuntswana e-zirconia kwimatrix ye-alumina aguqukela kwizakhiwo ze-monoclinic ngoxinzelelo olubangela ukuguqulwa kokuqina., ukunceda ukuvala iintanda kunye nokunyusa ukomelela kokwaphuka, ngaloo ndlela izikhusela emonakalweni kwiindawo ezahlukeneyo ezifana ne-phosphoric acid, i-asidi ye-sulfuric kunye namanzi adibeneyo. Oku kuvumela ukuba imelane nomhlwa.

Amandla aphezulu

Ukudibanisa i-alumina kunye ne-zirconia kubangela ukomelela okwandisiweyo kunye nokuqina kwe-fracture xa kuthelekiswa ne-alumina eqhelekileyo, ukwenza i-ZTA ibe lukhetho olugqwesileyo lwezixhobo kumacandelo aphantsi kokulayisha impembelelo. Ngaphaya koko, I-ZTA ikwaqhayisa ngokuxhathisa okukhulu kwimichiza.

I-ZTA iqhayisa ngobulukhuni obuphezulu kunye namandla ngenxa yokuguqulwa kwamasuntswana e-tetragonal zirconias abe yikristale ye-monoclinic ngotshintsho olubangelwa luxinzelelo ngokulayisha ngoomatshini okanye ukuguquguquka kobushushu., kunye noxinzelelo olulandelayo oluvela kwi-monoclinic zirconia crystal formation icinezela i-alumina matrix, ukunika amandla amakhulu, ukuqina, kunye nokumelana nokothuka kwe-thermal.

Le ceramic yahlukileyo ikwanawo amandla okugoba aphezulu kakhulu kunye ne-coefficient ephantsi yokwanda kwe-thermal, iyenza igqibelele kwizicelo ezifuna iindlela zokupholisa. Ngaphaya koko, ukumelana kwayo nemichiza eyonakalisayo – kuquka nolwelo lomzimba – yenza izifakelo zonyango zilungele ukubekwa ngaphakathi ebantwini ngaphandle komngcipheko wokuthotywa ixesha livumela izigulana ukuba zonwabele amava amnandi ngaphandle kokukhathazeka ngenxa yokuwohloka kokufakelwa kwexesha..

Ukuqina okuphezulu

Iiseramikhi ze-ZTA ziphucula ukuqina kwe-alumina ngokuguqulwa koxinzelelo-olunyanzeliswa kukuguquguquka kwamasuntswana e-zirconia ukuba abe ngcono., ifunyenwe ngokucofa kunye ne-isostatic eshushu yokucinezela (HIP). Kuxhomekeke ekubeni ingakanani i-zirconia ekhoyo kwi-matrix yayo, I-ZTA inokuba neempawu eziphantsi okanye eziphezulu zokuqina.

UClausen uboniswe kwi 1976 ukuba imatriki ye-alumina equlethe i-zirconia engazinzanga inokomelezwa ukuphucula iimpawu zoomatshini ngokubandakanya iikristale ze-zirconia ezingazinzanga njengoko zisasazwe ngokucokisekileyo iimvula ezinemetastable, ezifana nezo zenziwe kwiikristale ze-zirconia ezingazinzanga, ukuphucula iimpawu zoomatshini. Wayingqina le ngongoma esebenzisa i-crack propagation; xa iintanda ziqhubela phambili ngemathiriyeli kwaye zicinezele indawo yayo phambi kwencam yazo zinokutshintsha zibe kwisigaba se-monoclinic kwaye ziguqulele kuso ngokulula kunokuba bekunokwenzeka ngenye indlela..

Le ndlela yokuqinisa yonyusa amandla okuguquguquka kunye nokuqina kokuqhekeka kwe-alumina ngelixa ngaxeshanye isonyusa ubulukhuni., ukudala izinto ezidibeneyo ezingenakulinganiswa ezifanelekileyo kwizicelo ezifuna ubunzima obuphezulu, ukuqina, ukumelana nokwaphuka kunye neemfuno zokupholisa ezifana nabasiki bemizi-mveliso, iinxalenye zokusila okanye izinto zokupholisa.