Az alum\u00ednium-oxid por elengedhetetlen mag- \u00e9s t\u00f6lt\u0151anyag a nanokompozitokban, emellett az ipari kataliz\u00e1torok fontos hordoz\u00f3anyagak\u00e9nt is szolg\u00e1l. A por\u00f3zus korom s\u0171r\u0171 \u00e1llaga \u00e9s szennyez\u0151d\u00e9seket megk\u00f6t\u0151 k\u00e9pess\u00e9ge miatt a kozmetikai term\u00e9kek elengedhetetlen alkot\u00f3eleme, ugyanakkor alapanyagk\u00e9nt szolg\u00e1l a korundhoz, amely dr\u00e1gak\u00f6vek csiszol\u00e1s\u00e1hoz haszn\u00e1lt csiszol\u00f3anyag.<\/p>\n
Az alum\u00ednium-oxid port \u00fagy \u00e1ll\u00edtj\u00e1k el\u0151, hogy az alum\u00ednium-hidroxidot magas h\u0151m\u00e9rs\u00e9kleten kalcin\u00e1lj\u00e1k a v\u00edz elt\u00e1vol\u00edt\u00e1sa \u00e9s az alum\u00ednium-oxid el\u0151\u00e1ll\u00edt\u00e1sa \u00e9rdek\u00e9ben, majd ezt tov\u00e1bb feldolgozz\u00e1k, hogy k\u00fcl\u00f6nb\u00f6z\u0151 tulajdons\u00e1gokkal \u00e9s felhaszn\u00e1l\u00e1si ter\u00fcletekkel rendelkez\u0151 form\u00e1kat \u00e1ll\u00edtsanak el\u0151.<\/p>\n
Min\u0151s\u00e9g\u00e9t\u0151l f\u00fcgg\u0151en az alum\u00ednium-oxid text\u00far\u00e1ja finomt\u00f3l durv\u00e1ig terjedhet, \u00e9s k\u00fcl\u00f6nb\u00f6z\u0151 k\u00e9miai tisztas\u00e1gi fokozatokkal, valamint fel\u00fcleti ter\u00fcletekkel rendelkezhet. A nagyon alacsony szennyez\u0151d\u00e9sszint\u0171 min\u0151s\u00e9geket nagy tisztas\u00e1g\u00fa alum\u00ednium-oxidnak (HPA) nevezik, m\u00edg a rendk\u00edv\u00fcl nagy fel\u00fcleti ter\u00fclettel rendelkez\u0151ket \u2013 amelyek tisztas\u00e1gi fokozata alacsonyabb \u2013 szemcs\u00e9s alum\u00ednium-oxidnak (GA) nevezik.<\/p>\n
A finom alum\u00ednium-oxid porok megtal\u00e1lhat\u00f3k a pol\u00edroz\u00f3paszt\u00e1kban \u00e9s a kataliz\u00e1tor-hordoz\u00f3anyagokban, valamint t\u00f6lt\u0151anyagk\u00e9nt is felhaszn\u00e1lj\u00e1k \u0151ket a m\u0171anyag- \u00e9s gumi-gy\u00e1rt\u00e1si folyamatokban. Ezenk\u00edv\u00fcl a nagy tisztas\u00e1g\u00fa alum\u00ednium-oxidot elektronikus eszk\u00f6z\u00f6kh\u00f6z sz\u00e1nt zaf\u00edr hordoz\u00f3k gy\u00e1rt\u00e1s\u00e1hoz is haszn\u00e1lj\u00e1k, valamint f\u00e9mbevonattal ell\u00e1tva magas h\u0151m\u00e9rs\u00e9klet\u0171 kem\u00e9nyforraszt\u00e1si szerelv\u00e9nyekben is alkalmazz\u00e1k \u2013 r\u00f6viden: sokf\u00e9le felhaszn\u00e1l\u00e1si ter\u00fcleten alkalmazhat\u00f3, \u00e9s kiv\u00e1l\u00f3 elektromos szigetel\u0151k\u00e9nt is szolg\u00e1l.<\/p>\n
Az alum\u00ednium-oxid ipari term\u00e9kek \u00e9s g\u00e9pek v\u00e9d\u0151bevonatak\u00e9nt is felhaszn\u00e1lhat\u00f3, seg\u00edtve azok kop\u00e1s elleni v\u00e9delm\u00e9t. Kiv\u00e1l\u00f3 kem\u00e9nys\u00e9ge \u00e9s szil\u00e1rds\u00e1ga miatt az alum\u00ednium-oxid ide\u00e1lis ker\u00e1mia szigetel\u0151anyagok \u00e9s hordoz\u00f3k el\u0151\u00e1ll\u00edt\u00e1s\u00e1hoz, m\u00edg h\u0151kapacit\u00e1sa \u00e9s magas olvad\u00e1spontja miatt hasznos t\u0171z\u00e1ll\u00f3 term\u00e9kek gy\u00e1rt\u00e1s\u00e1ban, amelyeket p\u00e9ld\u00e1ul a petrolk\u00e9miai feldolgoz\u00e1sban, a cementgy\u00e1rt\u00e1sban, a hullad\u00e9k\u00e9get\u00e9sben, valamint a vas- \u00e9s ac\u00e9lgy\u00e1rt\u00e1sban alkalmaznak. Az alum\u00ednium-oxidot ak\u00e1r \u00fcveggel is keverhetik a szil\u00e1rds\u00e1g n\u00f6vel\u00e9se \u00e9rdek\u00e9ben.<\/p>\n
Az alum\u00ednium-oxid port sz\u00e1mos ipari term\u00e9k gy\u00e1rt\u00e1s\u00e1hoz haszn\u00e1lj\u00e1k, p\u00e9ld\u00e1ul a ker\u00e1miaiparban, a koh\u00e1szatban, az elektronik\u00e1ban \u00e9s a kataliz\u00e1torok el\u0151\u00e1ll\u00edt\u00e1s\u00e1ban. Termikai, k\u00e9miai \u00e9s mechanikai tulajdons\u00e1gai miatt az alum\u00ednium-oxid ide\u00e1lis anyag t\u0171z\u00e1ll\u00f3 anyagokhoz, csiszol\u00f3korongokhoz \u00e9s kop\u00e1s\u00e1ll\u00f3 alkalmaz\u00e1sokhoz, valamint alacsony s\u00farl\u00f3d\u00e1si \u00e9rt\u00e9keinek k\u00f6sz\u00f6nhet\u0151en biokompatibilit\u00e1si k\u00f6vetelm\u00e9nyekkel rendelkez\u0151 nanokompozitokhoz is alkalmas.<\/p>\n
Magas olvad\u00e1spontja \u00e9s h\u0151\u00e1ll\u00f3s\u00e1ga miatt az alum\u00ednium-oxidot sz\u00e9les k\u00f6rben haszn\u00e1lj\u00e1k elektromos eszk\u00f6z\u00f6k \u00e9s f\u00e9lvezet\u0151k gy\u00e1rt\u00e1s\u00e1ban. Ezenk\u00edv\u00fcl a h\u0171t\u0151bord\u00e1kban is kulcsfontoss\u00e1g\u00fa alkatr\u00e9szk\u00e9nt alkalmazz\u00e1k az elektronikus alkatr\u00e9szekben keletkez\u0151 h\u0151 elvezet\u00e9s\u00e9re, alacsony s\u00farl\u00f3d\u00e1si t\u00e9nyez\u0151je \u00e9s szigetel\u0151 tulajdons\u00e1gai pedig kiv\u00e1l\u00f3 anyagv\u00e1laszt\u00e1ss\u00e1 teszik kop\u00e1s\u00e1ll\u00f3 bevonatok k\u00e9sz\u00edt\u00e9s\u00e9hez.<\/p>\n
A kalcin\u00e1lt alum\u00ednium-oxidot sz\u00e9les k\u00f6rben alkalmazz\u00e1k a petrolk\u00e9miai iparban olyan ker\u00e1mia t\u00f6lt\u0151anyagok el\u0151\u00e1ll\u00edt\u00e1s\u00e1hoz, amelyeket a hidraulikus repeszt\u00e9s (fracking) sor\u00e1n haszn\u00e1lnak a reped\u00e9sek nyitva tart\u00e1s\u00e1ra, ezzel el\u0151seg\u00edtve a sz\u00e9nhidrog\u00e9nek kitermel\u00e9s\u00e9t a f\u00f6ld alatti lel\u0151helyekb\u0151l.<\/p>\n
A tiszta (99% alum\u00ednium-oxid) alum\u00ednium-oxidot sz\u00e9les k\u00f6rben haszn\u00e1lj\u00e1k olyan g\u00e9pek \u00e9s berendez\u00e9sek alkatr\u00e9szeinek gy\u00e1rt\u00e1s\u00e1hoz, amelyeknek kop\u00e1s\u00e1ll\u00f3nak kell lenni\u00fck, ugyanakkor hat\u00e9konyan kell szigetelni\u00fck a zajt \u00e9s a sug\u00e1rz\u00e1st. Az anyag gyakori alkalmaz\u00e1si ter\u00fcletei k\u00f6z\u00e9 tartoznak a tengelyek, csap\u00e1gyak, nyom\u00f3al\u00e1t\u00e9tek \u00e9s dugatty\u00fak a vegyi anyagokat sz\u00e1ll\u00edt\u00f3 szivatty\u00fakban, valamint a l\u00e9zerkomponensek, az elektrooptikai eszk\u00f6z\u00f6k, az \u00e1raml\u00e1sm\u00e9r\u0151 \u00e9rz\u00e9kel\u0151k \u00e9s a r\u00f6ntgenberendez\u00e9sek.<\/p>\n
Az alum\u00ednium-oxidot neh\u00e9z rakom\u00e1nyok sz\u00e1ll\u00edt\u00e1s\u00e1ra speci\u00e1lisan felszerelt teheraut\u00f3kkal vagy p\u00f3tkocsikkal, vas\u00faton, teherhaj\u00f3val vagy b\u00e1rmely m\u00e1s, az alum\u00edniumhoz hasonl\u00f3 sz\u00e1raz \u00f6mlesztett \u00e1ruk sz\u00e1ll\u00edt\u00e1s\u00e1ra tervezett m\u00f3don lehet sz\u00e1ll\u00edtani.<\/p>\n
Az alum\u00ednium-oxid sz\u00e1mos alkalmaz\u00e1si ter\u00fcleten elengedhetetlen anyag, p\u00e9ld\u00e1ul csiszol\u00f3anyagok, szinterelt term\u00e9kek, plazmasz\u00f3r\u00f3 anyagok \u00e9s t\u00f6lt\u0151anyagok gy\u00e1rt\u00e1s\u00e1ban. Ezen fel\u00fcl az alum\u00ednium-oxid egykrist\u00e1lyok, kataliz\u00e1torhordoz\u00f3k \u00e9s fluoreszk\u00e1l\u00f3 anyagok form\u00e1j\u00e1ban is el\u0151fordul. Az alum\u00ednium-oxid egyes felhaszn\u00e1l\u00e1si ter\u00fcletei magas tisztas\u00e1got \u00e9s sz\u0171k szemcsem\u00e9ret-eloszl\u00e1st ig\u00e9nyelnek, m\u00edg m\u00e1sok speci\u00e1lis alakzatokat; p\u00e9ld\u00e1ul a sz\u00e9nt\u00fczel\u00e9s\u0171 er\u0151m\u0171vekben haszn\u00e1lt ker\u00e1mia sz\u0171r\u0151knek 100 mikron \u00e1tm\u00e9r\u0151j\u0171 alum\u00ednium-oxid port kell tartalmazniuk, a f\u00fcstg\u00e1zcsatorn\u00e1khoz pedig a leghat\u00e9konyabb m\u0171k\u00f6d\u00e9s \u00e9rdek\u00e9ben henger alak\u00fa, 100 mikron \u00e1tm\u00e9r\u0151j\u0171 porra van sz\u00fcks\u00e9g.<\/p>\n
Az alum\u00ednium-oxid nagy r\u00e9sz\u00e9t a Bayer-elj\u00e1r\u00e1ssal \u00e1ll\u00edtj\u00e1k el\u0151, amelynek nyersanyagak\u00e9nt a bauxitot \u2013 egy f\u00f6ldi \u00e1sv\u00e1nyt \u2013 haszn\u00e1lj\u00e1k. A bauxitot a f\u00f6ldb\u0151l b\u00e1ny\u00e1ssz\u00e1k ki, majd az alum\u00ednium-oxid-gy\u00e1rakba sz\u00e1ll\u00edtj\u00e1k, ahol vizes hidroxid-oldatokkal oldj\u00e1k fel \u00e9s sz\u0171rik; az alum\u00ednium-oxid egy r\u00e9sz\u00e9t ezut\u00e1n alum\u00ednium-olvaszt\u00f3kba tov\u00e1bb\u00edtj\u00e1k, ahol elektrol\u00edzissel f\u00e9m alum\u00edniumm\u00e1 alak\u00edtj\u00e1k; a marad\u00e9kot pedig kalcin\u00e1lj\u00e1k, \u00e9s k\u00fcl\u00f6nf\u00e9le ker\u00e1miaipari term\u00e9kek \u2013 p\u00e9ld\u00e1ul szigetel\u0151k, t\u0171z\u00e1ll\u00f3 anyagok \u00e9s csiszol\u00f3anyagok \u2013, valamint csontimplant\u00e1tumok, csont- \u00e9s fog\u00e1szati implant\u00e1tumok, tov\u00e1bb\u00e1 laborat\u00f3riumi eszk\u00f6z\u00f6k \u00e9s laborat\u00f3riumi kemenc\u00e9k t\u0171z\u00e1ll\u00f3 b\u00e9l\u00e9sanyagai el\u0151\u00e1ll\u00edt\u00e1s\u00e1hoz haszn\u00e1lj\u00e1k fel.<\/p>\n
Az alum\u00ednium-oxid egy nyersanyag, vagyis az \u00e1ra a kereslet \u00e9s a k\u00edn\u00e1lat f\u00fcggv\u00e9ny\u00e9ben naponta ingadozik. A gy\u00e1rt\u00f3k szorosan figyelemmel k\u00eds\u00e9rik ezt az \u00e1rat, hogy a termel\u00e9si k\u00f6lts\u00e9geket ennek megfelel\u0151en tudj\u00e1k kiigaz\u00edtani; a sz\u00e1ll\u00edt\u00e1st \u00e1ltal\u00e1ban teheraut\u00f3val vagy vas\u00fati kocsival, \u00f6mlesztve v\u00e9gzik; a t\u00e1vols\u00e1gt\u00f3l \u00e9s a sz\u00e1ll\u00edt\u00e1shoz sz\u00fcks\u00e9ges sebess\u00e9gt\u0151l f\u00fcgg\u0151en haj\u00f3val is sz\u00e1ll\u00edthatj\u00e1k.<\/p>\n
Az alum\u00ednium-oxid az egyik legsz\u00e9lesebb k\u00f6rben haszn\u00e1lt m\u0171szaki ker\u00e1mia. Tulajdons\u00e1gai r\u00e9v\u00e9n kem\u00e9ny, k\u00e9miailag inert \u00e9s magas h\u0151m\u00e9rs\u00e9kleten is stabil; ez\u00e9rt az alum\u00ednium-oxid por ide\u00e1lis kop\u00e1s\u00e1ll\u00f3 anyagok \u00e9s t\u0171z\u00e1ll\u00f3 term\u00e9kek gy\u00e1rt\u00e1s\u00e1hoz k\u00fcl\u00f6nf\u00e9le alkalmaz\u00e1sokhoz. Az alum\u00ednium-oxid szigetel\u0151- \u00e9s elektromos tulajdons\u00e1gokkal is rendelkezik; a nagy tisztas\u00e1g\u00fa v\u00e1ltozatok ak\u00e1r az an\u00f3dok \u00e9s kat\u00f3dok k\u00f6z\u00f6tti elv\u00e1laszt\u00f3k\u00e9nt is felhaszn\u00e1lhat\u00f3k, hogy elker\u00fclj\u00e9k a r\u00f6vidz\u00e1rlatot az akkumul\u00e1torok k\u00f6z\u00f6tt.<\/p>\n
Az alum\u00ednium-oxid a mikrochipekhez \u00e9s elektronikus eszk\u00f6z\u00f6kh\u00f6z sz\u00fcks\u00e9ges szil\u00edciumlemezek gy\u00e1rt\u00e1s\u00e1nak is elengedhetetlen alapanyaga, ugyanakkor h\u0151\u00e1ll\u00f3s\u00e1ga, magas forr\u00e1s- \u00e9s olvad\u00e1spontja, valamint kiv\u00e1l\u00f3 vezet\u0151k\u00e9pess\u00e9ge miatt a f\u00e9nykibocs\u00e1t\u00f3 di\u00f3d\u00e1k (LED-ek) gy\u00e1rt\u00e1s\u00e1nak is n\u00e9lk\u00fcl\u00f6zhetetlen alkot\u00f3eleme.<\/p>\n
A jelen tal\u00e1lm\u00e1ny egy alum\u00ednium-oxid-porminta szennyez\u0151anyag-tartalm\u00e1nak m\u00e9r\u00e9s\u00e9re szolg\u00e1l\u00f3 m\u00f3dszert ismertet. Ennek sor\u00e1n az alum\u00ednium-oxid-mint\u00e1t r\u00f6ntgensug\u00e1rz\u00e1snak tessz\u00fck ki, majd a diffrakci\u00f3s sz\u00f6g\u00e9t \u00e9s intenzit\u00e1s\u00e1t r\u00f6gz\u00edtj\u00fck a m\u00e9r\u00e9s c\u00e9lj\u00e1b\u00f3l. Ezt k\u00f6vet\u0151en kisz\u00e1m\u00edthat\u00f3 a r\u00e1cs\u00e1lland\u00f3ja, \u00e9s meg\u00e1llap\u00edthat\u00f3 a r\u00e1cs\u00e1lland\u00f3 \u00e9s az alum\u00ednium-oxid-porminta szennyez\u0151anyag-tartalma k\u00f6z\u00f6tti \u00f6sszef\u00fcgg\u00e9s.<\/p>","protected":false},"excerpt":{"rendered":"
Alumina powder is an indispensable core and filler material in nanocomposites, and also serves as an important support compound for […]<\/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":[2],"tags":[],"class_list":["post-7","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/posts\/7","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/comments?post=7"}],"version-history":[{"count":1,"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/posts\/7\/revisions"}],"predecessor-version":[{"id":8,"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/posts\/7\/revisions\/8"}],"wp:attachment":[{"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/media?parent=7"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/categories?post=7"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminapowder.net\/hu\/wp-json\/wp\/v2\/tags?post=7"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}