Ukuqina okungahambelaniyo kunye neZirconia Ukuqina kweAlumina (ZTA) IiCeramics

Zirconia Toughened Alumina (ZTA) iiseramics ziqhayisa ngokuqina okungenakulinganiswa. Baqhayisa ngokumelana nokunxiba okuphezulu, I-inertness yeekhemikhali kunye nokukhuhlana okuphantsi kokusebenza ngokungenamgudu kwimisebenzi yemihla ngemihla – singasathethi ngobulukhuni obuphezulu kunye nokuqina kunezinyithi.

I-ZTA ibandakanya i-tetragonal zirconia polycrystal agglomerates enokumetastable kwi-alumina matrix eyenza utshintsho lwesigaba soxinzelelo kwimonoclinic phantsi koxinzelelo., ngoko ke kusasazwa ukucheba nokuyeka ukwanda kweentanda, eyaziwa ngokuba yinguqu yokuqina.

Ukunyangwa kukuMhlwa

I-ZTA inikezela ngokumelana neekhemikhali eziphezulu xa kuthelekiswa ne-alumina ecocekileyo kwaye inokumelana nobushushu obugqithisileyo ngaphandle kokuthotywa, iyenza ibe lolona khetho lufanelekileyo lwemathiriyeli kwizicelo zamashishini kwiindawo ezirhabaxa kunye neemeko.

Ukuqina kwe-ZTA kuphuculwe ngamasuntswana e-zirconia asasaza kwaye afunxa amandla, ukunceda ukuthintela ukuqhekeka. Xa ifakwe i-yttrium oxide, i-zirconia itshintsha ukusuka kwisigaba se-tetragonal esine-metastable ukuya kwi-monoclinic ngexesha loxinzelelo ukwenza uxinzelelo olunyusa ukuqina kokwaphuka..

I-zirconia-based ceramics efana ne-ZTA iqulethe amasuntswana e-alumina ukuxhathisa ukothuka kwe-thermal. Oku kuvumela ukuba imelane nokutshintsha kweqondo lokushisa ngokukhawuleza ngaphandle kokuqhekeka okanye ukungaphumeleli kwizicelo eziphezulu zokusebenza ezifana nokugaya kunye nokusika; Ukwandiswa kwayo okuphantsi komgca kunye ne-torsional kubonelela ngezakhono zokuthwala umthwalo obalaseleyo kunye nobuchule bokusebenza. I-ZTA iyaqhayisa 2-3 Amaxesha anamandla okuqina okuqinile xa kuthelekiswa ne-alumina esulungekileyo ngelixa ine-coefficients yolwandiso olusezantsi/lomtya wokwandiswa komthwalo okhethekileyo wokuthwala amandla kunye namandla okusebenza..

Ukuqina okuphezulu

I-ZTA idibanisa amandla kunye nokuqina kwe-alumina kunye ne-zirconia eqina kwisixhobo esikhethekileyo kwizicelo ezifunwayo.. Olu luhlu lunika amandla angenakulinganiswa, ukwaphuka kokuqina, ukuqina kunye neempawu zokuqina kwiphakheji enye.

UClaussen wafunyanwa kwi 1976 ukuba ukongeza i-zirconia engazinzanga kwi-alumina kwandisa kakhulu ukuqina kwayo kokuqhekeka, ngenxa yenguqu ye-tetragonal-monoclinic yeemvula ezisasazekileyo ze-tetragonal ezisasazwe ngaphakathi kwe-matrix yayo.. Ezo mvula zinemetastable zithintelwe ekutshintsheni de zikhutshwe yi-crack esondelayo ngaphambili okanye omnye umthombo wesiqabu kwisithintelo sabo., njengokunyibilika.

I-Hot-pressed 10mol% yttria-stabilized zirconia (10YSZ), yomelezwe nokuba ngamasuntswana okanye iiplatelet eziqulathe ukusuka 0 ukuya kwi-30wt% isiqulatho se-alumina siphantsi kwamandla angqongqo, Ukuqina koqhekeko kunye novavanyo olucothayo lokukhula kweecrack kwi-1000C emoyeni. Iziphumo zibonise ukuba amandla aphezulu okuguquguquka kunye nokuqina kokwaphuka kwimidibaniso yeplatelet kwafunyanwa ngalo mxholo wokuqulunqwa..

Amandla Okuqina aphezulu

I-Zirconia ceramics inika indibaniselwano engaqhelekanga yamandla, ukomelela, kunye nokuguquguquka okugqwesa kude iiseramikhi zobugcisa zemveli. I-Zirconia formulations efana ne-ZTA ibonelela ngezisombululo kwezona zicelo zinzima zanamhlanje ukusuka kwizinto ze-aerospace ezinyamezela iimeko ezinzima ukuya kwisizukulwana esilandelayo sokufakelwa kwe-biomedical eyenzelwe ubomi obude. – ukubonelela ngezisombululo ezithembekileyo kwiimfuno ezicinezelayo zanamhlanje.

I-ZTA ibalasele phakathi kwezinye izinto ngenxa yamandla ayo aphezulu aguqukayo, Ukuqina kokwaphuka kunye nokuchasana nokusasazwa kokuqhekeka ngenxa yenqanaba le-tetragonal elinometastable. Olu tshintsho lwenze i-zirconia ye-monoclinic kubushushu obuphantsi bucinezela indawo ephambi kwe-crack front ukunqanda ukukhula okuqhubekayo.

I-Yttria iZirconia ngokuyinxenye (Y-TZP) kunye ne-Cerium iZirconia ezizinzisiweyo (Yintoni-TZP) bonisa iimpawu zokuqina ezikhethekileyo ezifana ne-ZTA ngenxa yokugcinwa kwesigaba se-tetragonal ngokugcina i-yttria okanye i-cerium kumaqondo aphantsi., ivumela inguqu kuluhlu olulawulekayo lobushushu kwaye ibonise umonakalo omncinci womphezulu ngexesha lovavanyo lokulayishwa kwebhayisikile kunezabalingane beAlumina.

Ukukhuhlana okuphantsi

I-Zirconia yenye yezona zinto zinzima zobunjineli zeseramics ezikhoyo kunye neempawu zayo eziphantsi zokukhuhlana zinceda ukonyusa ukumelana nokunxiba ngelixa zinciphisa iimfuno zokuthambisa..

Iiseramikhi ze-ZTA ziqulethe i-alumina yokuqina okuphezulu. Oku kuvumela i-yttria-zinziswe yi-tetragonal zirconia yamaqhekeza kwi-alumina matrix ukuba ihlale ingatshintshi., eseleyo ikhazimliswe ngenxa yothungelwano olulukiweyo lweenkozo.

Ukwakheka okulawulwayo kunye neemeko zokusetyenzwa ziqinisekisa ukuba utshintsho oluzenzekelayo lwe-tetragonal-to-monoclinic alwenzeki ekupholiseni kwiqondo lobushushu le-sintering., inegalelo kwisakhono sokubetha okuninzi kuvavanyo lokuqina kokwaphuka. Ngaphaya koko, i-homogeneity ephezulu kwi-alumina-zirconia composites enobukhulu obuziinkozo obuncinci ikhokelela kumandla asezantsi wokuqhekeka okuthi kuguqulelwe kubude obufutshane bokuqhekeka ngexesha lovavanyo lokungeniswa kwedayimani..

Ukwandiswa kweThermal ephezulu

Amandla okubopha i-matrix ye-alumina yenza ukuba ithintele amasuntswana e-tetragonal zirconia ekutshintsheni kwi-zirconia ye-monoclinic ekupholiseni., ngokwenza njalo 10 imvukuzane % I-yttria-izinzile i-zirconia-alumina composites izinzile kwaye i-crack free.

Ukongezwa kwe-cerium kwi-zirconia kuvumela ukuba izinze ngokuyinxenye (Yintoni-TZP). I-Ce-TZP igcina isigaba sayo se-tetragonal kwiqondo lobushushu begumbi kwaye inyusa kakhulu ukuqina, ukuqina kokwaphuka kunye nokomelela okuguquguqukayo xa kuthelekiswa nemathiriyeli yeceramic yamazinyo emveli.

I-Zirconia Toughened Alumina composites edibanisa i-Ce-TZP, yttria-zirconia ezinzile (Y-TZP), okanye i-zirconia ye-magnesia-zinzile (UMg-PSZ) bonisa ukomelela okugqwesileyo kobo be-alumina kunye ne-monolithic zirconia, ukwenza i-ZTA ibe ngumgqatswa ogqibeleleyo wokufuna izicelo ezifana nokufakelwa kwezonyango, izixhobo ze-aerospace kunye noomatshini bemizi-mveliso. I-ZTA ikwaqhayisa ngeepropathi ezininzi zokumelana neekhemikhali eziyikhusela kwiiasidi, izisombululo zetyuwa, iityuwa ezinyibilikisiweyo alkali kwakunye namaqondo obushushu aphezulu.