Kulimba Kwambiri kwa Ntchito Zamakampani

Zirconia Toughened Alumina (ZTA) zida za ceramic zimaphatikiza kuuma ndi mphamvu za alumina ndi kulimba kwamphamvu kwa zirconia kuti apereke magwiridwe antchito ndi moyo wautali wamafakitale..

Kusintha kokhala ndi kupsinjika kwa tinthu tating'ono tating'ono ta zirconia tomwe timayika mkati mwa alumina matrix kumatsogolera ku ZTA zida zamphamvu komanso zolimba., oyenera kugwiritsidwa ntchito m'malo ovuta.

Kulimba mtima

ZTA imaphatikiza kuuma kwa alumina ndi kulimba kwa zirconia kwa kukana kosagwirizana ndi kuvala ndi kukwapula.. Izi zimatheka chifukwa cha kupsinjika-kupangitsa kusintha kolimba: pamene wapsinjika, zirconia particles kusintha kuchokera metastable tetragonal gawo mu khola monoclinic mawonekedwe; Kukula kwa voliyumu komwe kumachitika chifukwa cha kusintha kwapangidweku kumathandiza kutseka ming'alu iliyonse mkati mwa alumina matrix ndikuwonjezera kulimba kwambiri..

ZTA ili ndi mapulateleti a zirconia omwe amalowa mu alumina matrix panthawi ya sintering, kukulitsa kulimba kwa fracture ndi mphamvu ndikuwonjezera kulimba kwa fracture, kupanga zinthu zokhala ndi mphamvu zopindika kwambiri kuposa Y-TZP komanso mpaka kuwirikiza kawiri mphamvu yake ya kutopa. Kuphatikizika kwa kulimba kwa aluminiyamu kuphatikiza mphamvu ya zirconia kumapangitsa ZTA kukhala chisankho chabwino kwambiri pamafakitale omwe amafunikira kukana kuwonongeka..

Kukhalitsa

Zirconia Toughened Alumina (ZTA) ili ndi mphamvu zosinthika komanso zopondereza, ndi kukulitsa kwamafuta ochepa kofanana ndi aluminiyamu komanso mawonekedwe owoneka bwino okana kuvala.

Zirconia toughened alumina imapangidwa powonjezera mbewu za tetragonal zirconia kudzera pakusintha kopangitsa kupsinjika kukhala matrix olimba a alumina., kuwalowetsa mumpangidwe wake pomwe akuletsa kusinthika kwawo kumadera akumaloko m'malo mofalikira ponseponse.

Makinawa amapangitsa kuti alumina-zirconia azitha kukhala olimba kwambiri kuposa monolithic zirconia chifukwa chokana kuyamwa kwamadzi kudzera mu chemisorption.; monolithic zirconia imatha kuyamwa mamolekyu amadzi a polar omwe amayambitsa kutsika kwa kutentha ndipo pamapeto pake amasweka pakagwiritsidwa ntchito nthawi yayitali..

ZTA, mbali inayi, idapangidwa kuti ithandizire kusinthaku kwa tetragonal-to-monoclinic kudzera pamapangidwe ake ndi zowonjezera zamankhwala.. CeramTec imagulitsa Biolox Delta ZTA mwachitsanzo; kapangidwe kameneka kamakhala ndi yttria ndi strontium aluminate kuti zithandizire njira zolimba mkati mwa gawo lake la zirconia ndipo chifukwa chake zimakhala ndi chiwopsezo chochepa cha kutentha kwapang'onopang'ono pomwe zimapirira kutentha kwambiri..

Kukaniza kwa Corrosion

ZTA ceramics imapereka kukana kwamphamvu kwa dzimbiri kuposa anzawo a alumina ndipo chifukwa chake amatha kugwiritsidwa ntchito pazida zomwe zimakhudzidwa ndi malo ovuta.. Komanso, ZTA imatha kupirira kutentha kwambiri pomwe ikupereka kukhazikika kwamankhwala.

Garvie et al (1975) adawonetsa izi 10-20% zirconia zosakhazikika zimatha kukulitsa kulimba poyerekeza ndi alumina, kudzera mukusintha toughening. Izi zimachitika pamene finely omwazikana tetragonal metastable precipitates kusintha mu monoclinic zirconia pansi nkhawa kuchititsa voliyumu kukula kuti compresses ming'alu ndi kuchedwetsa kapena kusiya kufalitsa awo..

Makinawa amafanana ndi kupsinjika komwe kumayambitsidwa ndi deformation; komabe, kuti apangitse kusintha kwa gawo gawo lopanikizika liyenera kukhala lalikulu mokwanira; chifukwa cha ming'alu ya zitsanzo za ZTA mphamvuyi imachokera ku kupsinjika kwa malo ophwanyika.

Kukaniza Kutentha

Zirconia Toughened Alumina ili ndi malo osungunuka kwambiri komanso kukana dzimbiri, kupangitsa kuti ikhale yabwino kwa zida zomwe nthawi zambiri zimakumana ndi kutentha kwambiri. Komanso, mtundu uwu uli ndi kusamvana kwakukulu kuposa alumina wamba, kuthandizira kuchepetsa kuwonongeka kwa zida zomwe zili ndi mphamvu zapamwamba za kinetic.

ZTA ceramics amapangidwa kudzera kupsinjika-kupangitsa kusintha kwa tetragonal zirconia particles kukhala alumina matrix., kupangitsa kupsyinjika mkati mwawo komwe kumalepheretsa kufalikira kwa crack, kuonjezera mphamvu zonse ndi kulimba pamene akupereka kukana kugwedezeka kwa kutentha popanda kusweka kapena kusweka. Amadzitamandira kwambiri kukana kutentha kwamafuta; kukana kusintha kwachangu kwa kutentha popanda kusweka kapena kusweka pansi pa kupsinjika maganizo.

Zirconia-toughened alumina ili ndi ntchito zambiri m'mafakitale angapo chifukwa cha kuchuluka kwake kwazinthu. Injiniya wamakina imagwiritsa ntchito zida zapampu ndi zosindikizira; Semiconductor processing imagwiritsa ntchito chifukwa cha kukhazikika kwake komanso mphamvu zake; zamlengalenga, mafakitale amagalimoto ndi magetsi amazigwiritsa ntchito ngati zida za injini chifukwa chokana dzimbiri ndi mankhwala oopsa.; imatha ngakhale kupirira mphamvu zopindika kwambiri pamakina a mano!