![\"Youngov](\"https:\/\/aluminaceramics.net\/wp-content\/uploads\/2024\/06\/Youngs-Modulus-Alumina-ceramics.jpg\")
<\/p>","protected":false},"excerpt":{"rendered":"Oxid hlinit\u00fd je neocenite\u013en\u00fd keramick\u00fd materi\u00e1l, zn\u00e1my svojou vynikaj\u00facou odolnos\u0165ou vo\u010di oxid\u00e1cii a vlastnos\u0165ami Youngovho modulu. Vzh\u013eadom na vysok\u00fa teplotu potrebn\u00fa po\u010das procesov spekania v\u0161ak m\u00f4\u017ee \u00eds\u0165 o drah\u00fd materi\u00e1l.<\/p>\n
Pri izbovej teplote vykazuj\u00fa kompozity s \u010dasticami hlin\u00edka a YAG krehk\u00e9 spr\u00e1vanie s pribli\u017enou pevnos\u0165ou v ohybe pribli\u017ene 320 MPa. Aj pri teplote 1650 stup\u0148ov C zost\u00e1va ich mikro\u0161trukt\u00fara homog\u00e9nna s rovnomerne rozmiestnen\u00fdmi zrnami oxidu hlinit\u00e9ho a jemn\u00fdmi zrnami druhej f\u00e1zy, ktor\u00e9 vytv\u00e1raj\u00fa atrakt\u00edvnu mikro\u0161trukt\u00faru.<\/p>\n
Youngov modul oxidu hlinit\u00e9ho je neocenite\u013en\u00e1 vlastnos\u0165 materi\u00e1lu, ktor\u00e1 pom\u00e1ha ur\u010di\u0165 mechanick\u00fa pevnos\u0165 keramick\u00fdch materi\u00e1lov. Tento \u00fadaj hodnot\u00ed schopnos\u0165 materi\u00e1lu odol\u00e1va\u0165 kolm\u00fdm sil\u00e1m, ktor\u00e9 p\u00f4sobia kolmo na smer jeho roz\u0165a\u017enosti; jeho hodnota je definovan\u00e1 ako s\u00fa\u010din elastickej kon\u0161tanty a \u0161mykovej deform\u00e1cie a d\u00e1 sa \u013eahko vypo\u010d\u00edta\u0165 pomocou jednoduch\u00e9ho vzorca. Merania Youngovho modulu oxidu hlinit\u00e9ho mo\u017eno okrem in\u00e9ho vykona\u0165 aj pomocou pr\u00edstrojovej nanoindent\u00e1cie, sk\u00fa\u0161ok rot\u00e1cie ukazovate\u013ea a meran\u00ed deform\u00e1cie.<\/p>\n
Oxid hlinit\u00fd m\u00e1 zvy\u010dajne relat\u00edvne n\u00edzky Youngov modul, ktor\u00fd sa v\u0161ak d\u00e1 v\u00fdrazne zv\u00fd\u0161i\u0165 pomocou pokro\u010dil\u00fdch techn\u00edk synt\u00e9zy, ktor\u00e9 kontroluj\u00fa ve\u013ekos\u0165 a tvar gran\u00fal. Okrem toho zmeny hustoty po\u010das v\u00fdroby m\u00f4\u017eu tie\u017e pom\u00f4c\u0165 zv\u00fd\u0161i\u0165 hodnoty Youngovho modulu.<\/p>\n
Granule g-hlin\u00edka m\u00f4\u017eu nielen zlep\u0161i\u0165 Youngov modul, ale m\u00f4\u017eu sa vyu\u017ei\u0165 aj na r\u00f4zne aplik\u00e1cie v zubnom lek\u00e1rstve a in\u00fdch odvetviach. V\u010faka ich vysokej tvrdosti a tuhosti s\u00fa ide\u00e1lne pre zubn\u00e9 cementy; navy\u0161e sa z nich daj\u00fa dokonca vytv\u00e1ra\u0165 vlastn\u00e9 v\u00fdplne, ako napr\u00edklad fazety.<\/p>\n
Youngov modul oxidu hlinit\u00e9ho vykazuje siln\u00fa teplotn\u00fa z\u00e1vislos\u0165. Pomocou impulzn\u00e9ho budenia sa vykonala \u0161t\u00fadia na sledovanie zmien Youngovho modulu \u010diasto\u010dne spekan\u00fdch vzoriek oxidu hlinit\u00e9ho zahriatych od izbovej teploty do 1600 \u00b0C, potom sa porovnal s teoretick\u00fdmi predpove\u010fami a zistilo sa, \u017ee teplotn\u00e1 z\u00e1vislos\u0165 Youngovho modulu sleduje ide\u00e1lnu hlavn\u00fa krivku pre tento materi\u00e1l.<\/p>\n
Zobrazovanie FESEM sa pou\u017eilo aj na sk\u00famanie mikro\u0161trukt\u00fary matrice oxidu hlinit\u00e9ho a zmesi druhej f\u00e1zy pri teplot\u00e1ch a\u017e do 1700 \u00b0C, pri\u010dom v jej mikro\u0161trukt\u00fare nebolo mo\u017en\u00e9 pozorova\u0165 \u017eiadne zmeny a bol zaznamenan\u00fd len mal\u00fd rast z\u0155n - \u010do nazna\u010duje, \u017ee ich \u0161tiepny \u00fa\u010dinok zost\u00e1va \u00fa\u010dinn\u00fd aj pri t\u00fdchto teplot\u00e1ch.<\/p>\n
V\u00fdsledky ohybov\u00fdch testov odhalili, \u017ee vzorky Vita In-Ceram z oxidu hlinit\u00e9ho mali v\u00fdrazne vy\u0161\u0161ie hodnoty dynamick\u00e9ho Youngovho modulu a skuto\u010dnej tvrdosti v porovnan\u00ed s IPS Empress 2 a in\u00fdmi komer\u010dn\u00fdmi materi\u00e1lmi jadier vr\u00e1tane in\u00fdch materi\u00e1lov jadier Vita. Zistilo sa tie\u017e, \u017ee kompozity z oxidu hlinit\u00e9ho maj\u00fa najvy\u0161\u0161ie pevnosti v ohybe, \u010do znamen\u00e1, \u017ee s\u00fa schopn\u00e9 odola\u0165 za\u0165a\u017eeniu v ohybe. Anal\u00fdza poradia SNK testu pevnosti v ohybe bola tie\u017e schopn\u00e1 rozl\u00ed\u0161i\u0165 chemick\u00e9 a \u0161truktur\u00e1lne rozdiely medzi piatimi komer\u010dn\u00fdmi materi\u00e1lmi jadier. Bola zisten\u00e1 p\u00f4sobiv\u00e1 korel\u00e1cia medzi pevnos\u0165ou v ohybe a skuto\u010dnou tvrdos\u0165ou kompozitov oxidu hlinit\u00e9ho a pou\u017eit\u00edm v zubnom lek\u00e1rstve (p0,05), \u010do nazna\u010duje, \u017ee s\u00fa vhodnej\u0161ie ako komer\u010dn\u00e9 jadrov\u00e9 materi\u00e1ly pre zubn\u00e9 pou\u017eitie. Tento v\u00fdskum je s\u013eubn\u00fd a prispeje k vytvoreniu granul\u00e1tu oxidu hlinit\u00e9ho so zlep\u0161en\u00fdmi mechanick\u00fdmi vlastnos\u0165ami, \u010do umo\u017en\u00ed zubn\u00fdm lek\u00e1rom poskytova\u0165 svojim pacientom optim\u00e1lnu stomatologick\u00fa starostlivos\u0165 a pom\u00f4\u017ee zlep\u0161i\u0165 kvalitu \u017eivota najm\u00e4 geriatrick\u00fdch pacientov.<\/p>\n
Youngov modul je z\u00e1kladn\u00e1 vlastnos\u0165 materi\u00e1lu, ktor\u00e1 ur\u010duje jeho schopnos\u0165 absorbova\u0165 nap\u00e4tie pred poru\u0161en\u00edm. Pou\u017e\u00edva sa v r\u00f4znych aplik\u00e1ci\u00e1ch, od leteck\u00e9ho a automobilov\u00e9ho dizajnu a\u017e po stavebn\u00e9 materi\u00e1ly, ako je hlin\u00edk. Vy\u0161\u0161\u00ed Youngov modul znamen\u00e1 tuh\u0161\u00ed materi\u00e1l. Youngov modul oxidu hlinit\u00e9ho je 12,6 GPa, \u010do z neho rob\u00ed jeden z najpevnej\u0161\u00edch keramick\u00fdch materi\u00e1lov, ktor\u00e9 s\u00fa v s\u00fa\u010dasnosti k dispoz\u00edcii.<\/p>\n
Pru\u017en\u00e9 vlastnosti oxidu hlinit\u00e9ho s\u00fa dan\u00e9 jeho \u0161trukt\u00farou, chemick\u00fdm zlo\u017een\u00edm a mikro\u0161trukt\u00farou. Oxid hlinit\u00fd je polykry\u0161talick\u00fd materi\u00e1l zlo\u017een\u00fd z f\u00e1z y a a oddelen\u00fdch hranicou zrna oxidu hlinit\u00e9ho; jednu f\u00e1zu tvor\u00ed oxid hlinit\u00fd, druh\u00fa oxidy alkalick\u00fdch kovov a oxid kremi\u010dit\u00fd. Obe vrstvy s\u00fa prepojen\u00e9 nanovl\u00e1knami a mikro\u010dasticami, ktor\u00e9 v\u00fdznamne prispievaj\u00fa k vysokej hodnote Youngovho modulu.<\/p>\n
Youngov modul oxidu hlinit\u00e9ho mo\u017eno stanovi\u0165 r\u00f4znymi experiment\u00e1lnymi met\u00f3dami, ale je ve\u013emi d\u00f4le\u017eit\u00e9, aby sa zoh\u013eadnili podmienky, za ktor\u00fdch sa merania vykon\u00e1vaj\u00fa. Jednou z \u00fa\u010dinn\u00fdch techn\u00edk na tento \u00fa\u010del je pou\u017eitie krivky za\u0165a\u017eenie - posun z\u00edskanej pomocou mechanick\u00e9ho sk\u00fa\u0161obn\u00e9ho zariadenia - meria sa \u0148ou, ak\u00e1 ve\u013ek\u00e1 sila mus\u00ed vnikn\u00fa\u0165 do vzorky, aby do\u0161lo k jej posunu, a tie\u017e to, ako teplota ovplyv\u0148uje v\u00fdsledky r\u00f4znych sk\u00fa\u0161ok; hodnoty modulu pru\u017enosti ve\u013emi z\u00e1visia od teplotn\u00fdch rozdielov, tak\u017ee ich v\u00fdsledky s\u00fa pri jednotliv\u00fdch sk\u00fa\u0161kach ve\u013emi premenliv\u00e9.<\/p>\n
Youngov modul sa zvy\u0161uje so zvy\u0161uj\u00facou sa teplotou a jeho pevnos\u0165 v \u0165ahu kles\u00e1 so spekan\u00edm oxidu hlinit\u00e9ho. Elektrick\u00e1 vodivos\u0165 tie\u017e z\u00e1vis\u00ed od teploty; obsah i\u00f3nov alkalick\u00fdch kovov tie\u017e ovplyv\u0148uje \u00farove\u0148 elektrickej vodivosti; odpor sa zvy\u0161uje s vy\u0161\u0161ou teplotou a men\u0161ou ve\u013ekos\u0165ou p\u00f3rov.<\/p>\n
Synt\u00e9za por\u00e9zneho oxidu hlinit\u00e9ho s po\u017eadovan\u00fdmi fyzik\u00e1lnymi vlastnos\u0165ami je n\u00e1ro\u010dn\u00e1 \u00faloha vzh\u013eadom na mno\u017estvo premenn\u00fdch ovplyv\u0148uj\u00facich jeho fyzik\u00e1lne vlastnosti a spr\u00e1vanie. Cie\u013eom tejto \u0161t\u00fadie je vytvori\u0165 efekt\u00edvny postup v\u00fdroby por\u00e9zneho oxidu hlinit\u00e9ho s vyrovnan\u00fdmi hodnotami p\u00f3rovitosti a Youngovho modulu s pou\u017eit\u00edm Taguchiho met\u00f3dy optimaliz\u00e1cie v\u00fdrobn\u00e9ho procesu, ako je \u010das spekania, r\u00fdchlos\u0165 ohrevu pri kalcin\u00e1cii a proces z\u00e1vere\u010dn\u00e9ho tepeln\u00e9ho spracovania, na zlep\u0161enie v\u00fdrobn\u00e9ho procesu por\u00e9zneho materi\u00e1lu oxidu hlinit\u00e9ho.<\/p>\n
V\u00fdsledky uk\u00e1zali, \u017ee syntetick\u00fd g-hlin\u00edk s n\u00edzkou ve\u013ekos\u0165ou p\u00f3rov a vysok\u00fdm Youngov\u00fdm modulom mo\u017eno vyrobi\u0165 pomocou novej met\u00f3dy synt\u00e9zy. Tento pr\u00edstup zdvojn\u00e1sobuje Youngov modul a z\u00e1rove\u0148 spev\u0148uje keramiku, v\u010faka \u010domu je vhodn\u00e1 pre aplik\u00e1cie vy\u017eaduj\u00face vysoko v\u00fdkonn\u00e9 materi\u00e1ly. Granule vyroben\u00e9 t\u00fdmto pr\u00edstupom sa vyzna\u010duj\u00fa vysokou plasticitou pre deform\u00e1ciu bez vzniku trhl\u00edn, \u010do je d\u00f4le\u017eit\u00e1 vlastnos\u0165 pre lek\u00e1rske a zubn\u00e9 aplik\u00e1cie. Okrem toho sa v\u010faka tomuto postupu synt\u00e9zy v\u00fdrazne zn\u00ed\u017eila jej l\u00e1mavos\u0165, \u010d\u00edm sa t\u00e1to keramika stala klinicky pou\u017eite\u013enej\u0161ou ako predt\u00fdm.<\/p>\n
Youngov modul je z\u00e1kladnou mechanickou vlastnos\u0165ou pre mnoh\u00e9 aplik\u00e1cie. Meria odolnos\u0165 materi\u00e1lov vo\u010di nam\u00e1haniu a z\u00e1rove\u0148 ukazuje, ako dobre absorbuj\u00fa vibr\u00e1cie alebo r\u00e1zov\u00e9 vlny. Vy\u0161\u0161\u00ed Youngov modul znamen\u00e1 v\u00e4\u010d\u0161iu odolnos\u0165 vo\u010di po\u0161kodeniu; hlin\u00edk v tomto oh\u013eade vynik\u00e1 mimoriadne vysokou hodnotou Youngovho modulu, v\u010faka \u010domu je vynikaj\u00facou vo\u013ebou materi\u00e1lu na pou\u017eitie v stroj\u00e1rskych aplik\u00e1ci\u00e1ch.<\/p>\n
Hlin\u00edk je pevn\u00fd a cenovo v\u00fdhodn\u00fd materi\u00e1l. Hoci nie je tak\u00fd pevn\u00fd ako oce\u013e, jeho ni\u017e\u0161ia hmotnos\u0165 umo\u017e\u0148uje jeho \u010dastej\u0161ie pou\u017e\u00edvanie v lietadl\u00e1ch, kde hmotnos\u0165 zohr\u00e1va rozhoduj\u00facu \u00falohu. Hlin\u00edk tie\u017e zni\u017euje spotrebu paliva a emisie, \u010d\u00edm pom\u00e1ha \u017eivotn\u00e9mu prostrediu.<\/p>\n
Jednou z v\u00fdhod oxidu hlinit\u00e9ho je jeho odolnos\u0165 vo\u010di hydroterm\u00e1lnemu starnutiu. Okrem toho jeho Youngov modul patr\u00ed k najvy\u0161\u0161\u00edm spomedzi v\u0161etk\u00fdch keramick\u00fdch materi\u00e1lov, \u010do znamen\u00e1, \u017ee odol\u00e1va extr\u00e9mnym teplotn\u00fdm podmienkam bez toho, aby pod tlakom praskal. Oxid hlinit\u00fd m\u00e1 po\u010detn\u00e9 vyu\u017eitie v lek\u00e1rskych zariadeniach, kde kostn\u00e9 implant\u00e1ty musia zosta\u0165 nepo\u0161koden\u00e9, zatia\u013e \u010do zubn\u00e9 aplik\u00e1cie vyu\u017e\u00edvaj\u00fa jeho vlastnosti proti po\u0161kodeniu tren\u00edm.<\/p>\n
Youngov modul oxidu hlinit\u00e9ho z\u00e1vis\u00ed od jeho \u010distoty a s\u00favis\u00ed aj s tvrdos\u0165ou. \u010c\u00edm \u010distej\u0161\u00ed oxid hlinit\u00fd sa vyr\u00e1ba, t\u00fdm sa jeho Youngov modul zvy\u0161uje. Bohu\u017eia\u013e, kv\u00f4li n\u00edzkemu koeficientu samodif\u00fazie a bodu topenia m\u00f4\u017ee by\u0165 n\u00e1ro\u010dn\u00e9 vyrobi\u0165 \u010dist\u00fd oxid hlinit\u00fd, ale pridan\u00edm uhl\u00edka do jeho matrice by sa to mohlo v\u00fdrazne zv\u00fd\u0161i\u0165 a v\u00fdrazne zv\u00fd\u0161i\u0165 Youngov modul.<\/p>\n
Youngov modul kles\u00e1 s teplotou, preto\u017ee \u010dastice sa k sebe pribli\u017euj\u00fa a vytv\u00e1raj\u00fa medzi sebou pevnej\u0161ie v\u00e4zby. Napriek tomu je mo\u017en\u00e9 vytvori\u0165 viaczlo\u017ekov\u00e9 materi\u00e1ly z oxidu hlinit\u00e9ho s lok\u00e1lne vy\u0161\u0161\u00edmi Youngov\u00fdmi modulmi t\u00fdm, \u017ee sa do ich zlo\u017eenia zahrn\u00fa pr\u00edsady s morfol\u00f3giou v tvare ty\u010diniek alebo metli\u010diek, ako aj anizotropn\u00e9 predlisky.<\/p>\n
Dynamick\u00e1 indent\u00e1cia zost\u00e1va jedn\u00fdm z najob\u013e\u00fabenej\u0161\u00edch pr\u00edstupov k meraniu vlastn\u00e9ho Youngovho modulu oxidu hlinit\u00e9ho, ale t\u00e1to met\u00f3da je nepresn\u00e1, preto\u017ee meria len po\u0161koden\u00e9 z\u00f3ny pod hrotom indent\u00e1cie. Namiesto toho t\u00e1to \u0161t\u00fadia navrhuje nov\u00fa inovat\u00edvnu met\u00f3du zah\u0155\u0148aj\u00facu extrapol\u00e1ciu kriviek za\u0165a\u017eenia a posunutia vzoriek; s v\u00fdsledkami porovnate\u013en\u00fdmi s technikami sk\u00fa\u0161ania mikrotvrdosti.<\/p>\n
V tomto \u010dl\u00e1nku sa sk\u00fama, ako mo\u017eno kombinova\u0165 numerick\u00e9 modelovanie a experiment\u00e1lne techniky na predpovedanie modulu pru\u017enosti povlaku oxidu hlinit\u00e9ho nanesen\u00e9ho na hlin\u00edkov\u00fd substr\u00e1t s pou\u017eit\u00edm trojbodov\u00fdch a \u0161tvorbodov\u00fdch ohybov\u00fdch sk\u00fa\u0161ok ako prostriedkov na hodnotenie jeho mechanick\u00fdch vlastnost\u00ed.<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Alumina is an invaluable ceramic material, known for its superior oxidation resistance and Young’s modulus properties. However, due to the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[6],"tags":[],"class_list":["post-94","post","type-post","status-publish","format-standard","hentry","category-alumina-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/94","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/comments?post=94"}],"version-history":[{"count":3,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/94\/revisions"}],"predecessor-version":[{"id":182,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/posts\/94\/revisions\/182"}],"wp:attachment":[{"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/media?parent=94"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/categories?post=94"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminaceramics.net\/sk\/wp-json\/wp\/v2\/tags?post=94"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}