Zirconia Toughed Alumina don Babban Aikace-aikace

ZTA wani abu ne na alumina-zirconia mai haɗe, bambanta ta mafi girma ƙarfi da taurin. An ƙirƙira ta hanyar canjin yanayi mai haifar da damuwa na kyawawan ƙwayoyin tetragonal zirconia a cikin matrix alumina..

Abubuwan yumbu na zirconia sune kayan fasaha na ban mamaki, alfahari kyau kwarai taurin, thermal kwanciyar hankali, sa juriya da yanayin aiki inda sauran tukwane da yawa ba za su iya yi ba. Karfe da robobi ba za su iya kwatanta su ba. Bugu da kari, Zirconia yumbu kuma yana nuna ƙwaƙƙwaran taurin yin kayan aiki.

Ƙarfi

ZTA ta yi fice a tsakanin kayan yumbu tare da keɓaɓɓen ƙarfi da taurin sa, sa juriya, sinadaran rashin aiki, low gogayya coefficient, babban taurin/tauri rabo da in mun gwada da ƙarancin haɓaka haɓakar haɓakar thermal idan aka kwatanta da yawancin sauran – yin shi kayan aiki mai mahimmanci don aikace-aikace kamar kayan aikin yankan. Bugu da kari, Daidaitaccen yanayin sa kuma yana sa ZTA ya zama zaɓin abu mai ban sha'awa.

ZTA an bayyana shi ta hanyar rarraba iri ɗaya na tetragonal zirconia barbashi a cikin matrix alumina.. Ana cim ma wannan ta amfani da ingantattun dabarun haɗawa irin su ƙwallon ƙwallon ƙafa da ƙarfin kuzari mai ƙarfi.; da zarar an hade su tare za'a iya samar da foda a cikin abin da ake so ta hanyar amfani da bushewa, isostatic latsa, allura gyare-gyare ko extrusion dabaru.

Zirconia da aka tarwatsa ko'ina cikin matrix alumina yana haɓaka taurin karaya ta hanyar sha da watsar da kuzari, aka sani da canji toughening. Zirconia kuma yana ba da gudummawar sa juriya ta hanyar haifar da matsananciyar damuwa wanda ke hana yaduwar fasa – aka sani da kaifin kai – yin ZTA kyakkyawan zaɓi na abu don niƙa ƙafafun.

Tauri

Zirconia taurin Alumina (ZTA) yumbu suna alfahari da ƙarfi mai ban sha'awa da taurin karaya, sanya su cikakke don amfani a cikin kewayon aikace-aikace da mahalli. Wannan juriya mai ban mamaki ta fito ne daga canjin lokaci mai haifar da damuwa na lafiya, Tetragonal zirconia barbashi iri ɗaya tarwatsewa a cikin matrix alumina; damuwa yana haifar da canji na lokaci don samar da cibiyoyin sadarwa na microcrack na zirconia-alumina wanda ke sha da makamashi na yaduwa ta yadda ya kamata yana jinkirta yaduwar su yayin da yake kara juriya. (Clausen 1976).

ZTA ta yi fice saboda fitaccen juriyar girgizawar zafi. Godiya ga keɓancewar haɗin haɗin tetragonal-monoclinic, wannan yumbu na iya jure saurin canje-canje a yanayin zafi ba tare da tsagewa ko karyewa ba, yayin da danniya ya haifar da canjin zirconia a cikin nau'in tetragonal na metastable yana haifar da matsananciyar damuwa wanda ke magance samuwar fasa a cikin matrix na alumina kuma yana ƙaruwa da ƙarfi ta haka yana ƙara haɓaka aikin ZTA..

ZTA yana alfahari ba kawai ƙarfinsa ba, Tsarin tetragonal-monoclinic da babban taurin karaya, amma kuma ƙarancin haɓakar haɓakar thermal (CTE), sanya shi dacewa da aikace-aikacen da ke buƙatar matsanancin zafi ko mahalli inda kwanciyar hankali mai girma ke da mahimmanci, kamar daidaitattun abubuwan da aka gyara ko fakitin lantarki.

ZTA ta yi fice a cikin kayan dasa kayan aikin likita saboda haɗewar sinadarai, kaddarorin inji da damuwa sun taimaka juriyar lalata a cikin ruwa ko ruwan jiki, yana mai da shi babban ɗan takara don ƙwararrun likitocin kamar kawuna na femoral na orthopedic da layin acetabular.. BioLOX Delta biomaterial daya ne irin wannan misali; ana amfani da su sosai a lokacin tiyatar orthopedic don aikace-aikacen biyu.

Juriya na Lalata

ZTA yana da kyawawan kaddarorin duka alumina da zirconia, yana mai da matuƙar juriya ga duka harin sinadari da lalacewa, yin shi cikakke don aikace-aikacen da suka haɗa da mahalli masu lalacewa ko juzu'i mai maimaitawa ko damuwa na inji.

Haɗa taurin alumina tare da taurin zirconia yana haifar da kyawawan kaddarorin tribological waɗanda ke haifar da kyakkyawan juriya a cikin abubuwan da aka haɗa tare da nauyi mai nauyi da amfani na dogon lokaci., kamar ƙwanƙwasa orthopedic, yankan kayan aikin da sawa abubuwan da ba su da ƙarfi da ake amfani da su wajen sarrafa ruwa (jagororin zare, bearings, nozzles da dai sauransu). Wannan haɗin yana da amfani musamman a cikin tsarin likitanci da masana'antu kamar ƙwanƙwasa orthopedic, yankan kayan aikin ko sarrafa ruwa (zaren shiryar da bearings nozzles da dai sauransu).

Za a iya dangana taurin karyewar ZTA zuwa ga barbashi na zirconia da aka rarraba a cikin matrix na alumina.. Lokacin da fasa suka fara yaduwa, lokacin da kuzarinsu ya karu kuma ya kara yaduwa tare, waɗannan hatsin tetragonal zirconia suna jujjuya canjin lokaci don sha da ɓatar da shi a matsayin wani ɓangare na tsarin ƙarfafa canji. – don haka inganta karaya taurin wannan abu.

Nasarar kera ZTA yumbura ta ta'allaka ne a cikin yin amfani da ingantaccen zirconia da foda alumina mara ƙazanta.. Dole ne a sarrafa sintering don guje wa canji na tetragonal-zuwa-monoclinic zirconia ba tare da bata lokaci ba yayin sanyaya kuma don rage girman samuwar tsarin lokaci na monoclinic wanda ke da saukin kamuwa da kemisorption tare da kwayoyin ruwa wanda ke haifar da raguwar zafin jiki kan amfani na dogon lokaci.; Saint-Gobain ZirPro's ZTA yumbu ta tsarin sintering an ƙirƙira shi musamman don guje wa irin waɗannan abubuwan da ba a so.. An yi sa'a Saint-Gobain ZirPro yumbu na ZTA yumbu an ƙera shi musamman don hana irin waɗannan abubuwan faruwa. –

Ƙarfafawar thermal

Zirconia taurin Alumina (ZTA) zai iya jure saurin canje-canje a yanayin zafi ba tare da tsagewa ko karyewa ba, godiya ga barbashi na zirconia da suka tarwatse a cikin matrix alumina suna ɗaukar makamashin zafi da ƙirƙirar matsalolin matsawa waɗanda ke hana fashewa da gazawa.. Domin ZTA tana shakar makamashin zafi yadda ya kamata, wannan abu yana yin kyakkyawan zaɓi don aikace-aikacen da ke buƙatar juriya mai zafi.

Ƙara zirconia zuwa matrix alumina na iya ƙara ƙarfin karaya yayin da lokaci guda inganta kayan aikin injiniya kamar ƙarfi da juriya.. Ƙarfafa taurin karyewa a cikin ZTA yana da alaƙa da sauye-sauyen da ke haifar da danniya daga lokacin tetragonal metastable zuwa lokaci na monoclinic a yanayin yanayin yanayi.; wani tasiri da aka ƙara ta hanyar ƙarami mai girma na zirconia fiye da waɗanda ke cikin alumina.

Ana yawan amfani da masu daidaitawa don adana lokacin zirconia tetragonal a cikin kayan ZTA kamar Biolox Delta.; duk da haka, irin wannan sakamakon za a iya samu ba tare da stabilizers dangane da barbashi rarraba da karaya taurin.

Haɗin alumina da zirconia yana haifar da yumbu mai ci gaba wanda ya fi ƙarfin ƙarfi, karaya tauri, elasticity da taurin – halaye masu mahimmanci ga aikace-aikacen da ke buƙatar aikin tsari da juriya na lalata. ZTA yumbura yakan yi fice 99% alumina tukwane a kasancewa masu tsada-tsari yayin saduwa da takamaiman aikace-aikacen yana buƙatar mafi inganci; Har ila yau ana iya daidaita rabonsu na musamman.