Skl\u00e1\u0159sk\u00e9 p\u00edsky pou\u017e\u00edvan\u00e9 k v\u00fdrob\u011b skel s vysok\u00fdm obsahem oxidu hlinit\u00e9ho obvykle obsahuj\u00ed n\u00edzk\u00fd pod\u00edl ho\u0159\u010d\u00edku. Tento miner\u00e1ln\u00ed p\u00edsek m\u016f\u017ee poch\u00e1zet bu\u010f z lo\u017eisek horninov\u00e9ho typu, nebo z nerafinovan\u00fdch p\u0159\u00edrodn\u00edch zdroj\u016f a mus\u00ed takov\u00fd z\u016fstat po celou dobu v\u00fdroby.<\/p>\n
SEM-EDS anal\u00fdza vzorku zelen\u00e9ho skla JXL09 odhalila \u010derven\u00e9 inkluze obsahuj\u00edc\u00ed krystaly barytu a obohacen\u00ed o Cu, Fe a S, co\u017e nazna\u010duje, \u017ee obsahuje sulfidick\u00e9 m\u011b\u010f-\u017eelezn\u00e9 suroviny.<\/p>\n
Hlin\u00edkov\u00e9 sklo je sklo z oxidu hlinit\u00e9ho s mnoha jedine\u010dn\u00fdmi vlastnostmi, d\u00edky nim\u017e je vysoce cen\u011bno v aplikac\u00edch vy\u017eaduj\u00edc\u00edch pevnost, chemickou a tepelnou odolnost, optickou pr\u016fhlednost a n\u00edzkou elektrickou vodivost. Hlin\u00edk se hojn\u011b pou\u017e\u00edv\u00e1 v oknech letadel a automobil\u016f, v p\u0159\u00edstroj\u00edch pro no\u010dn\u00ed vid\u011bn\u00ed i v tepeln\u00fdch ku\u017eel\u00edch raket. Krom\u011b toho se oxid hlinit\u00fd m\u016f\u017ee pochlubit n\u00edzkou elektrickou vodivost\u00ed, koeficientem rozta\u017enosti a tvrdost\u00ed (nejvy\u0161\u0161\u00ed stupe\u0148 Mohsovy stupnice).<\/p>\n
Archeologick\u00e1 nalezi\u0161t\u011b v ji\u017en\u00ed Asii poskytla \u010detn\u00e9 p\u0159\u00edklady skel vyroben\u00fdch ze skel bohat\u00fdch na oxid hlinit\u00fd. Anal\u00fdza slo\u017een\u00ed nazna\u010duje, \u017ee tato skla byla vyrobena podle receptur, kter\u00e9 maj\u00ed v t\u00e9to oblasti dlouhou historii; nen\u00ed v\u0161ak zn\u00e1mo, zda jejich jednotliv\u00e9 receptury vznikly pr\u00e1v\u011b zde, nebo byly p\u0159evzaty odjinud z v\u011bt\u0161\u00ed skupiny receptur.<\/p>\n
Hlin\u00edk zlep\u0161uje teplotu skeln\u00e9ho p\u0159echodu, hustotu a chemickou odolnost sodno-k\u0159emi\u010dit\u00e9ho skla t\u00edm, \u017ee zvy\u0161uje jeho teplotu skeln\u00e9ho p\u0159echodu, hustotu a chemickou odolnost. Hlin\u00edk tak\u00e9 potla\u010duje tvorbu modr\u00e9ho z\u00e1kalu boru a z\u00e1rove\u0148 zastavuje jeho oxidaci \u010d\u00e1sticemi oxidu k\u0159emi\u010dit\u00e9ho. Hlin\u00edkov\u00e9 sklo nab\u00edz\u00ed oproti tradi\u010dn\u00edm izola\u010dn\u00edm a dekorativn\u00edm skl\u016fm mnoho v\u00fdhod, jako je zv\u00fd\u0161en\u00e1 pevnost, vy\u0161\u0161\u00ed bod t\u00e1n\u00ed, ni\u017e\u0161\u00ed \u00farove\u0148 elektrick\u00e9 vodivosti, ni\u017e\u0161\u00ed koeficient rozta\u017enosti a vynikaj\u00edc\u00ed vlastnosti odolnosti proti korozi.<\/p>\n
Mikrostruktura korundov\u00e9ho skla se li\u0161\u00ed podle stupn\u011b kalcinace. Nekalcinovan\u00e9 vzorky vykazuj\u00ed s\u00ed\u0165 krystal\u016f a n\u011bkter\u00e9 dutiny; p\u0159i zah\u0159\u00e1t\u00ed na teploty, kter\u00e9 zp\u016fsob\u00ed, \u017ee se povrchov\u00e1 krystalizace zv\u00fd\u0161\u00ed je\u0161t\u011b v\u00edce ne\u017e u b\u011b\u017en\u00e9ho skla; nap\u0159\u00edklad u GS028 lze vedle \u010d\u00e1stic hlinitok\u0159emi\u010ditanu sodn\u00e9ho a sodalitu pozorovat shluky oxidu olovnat\u00e9ho; u jin\u00fdch vzork\u016f s dal\u0161\u00edmi \u010d\u00e1sticemi obsahuj\u00edc\u00edmi oxid hlinit\u00fd se povrchov\u00e1 krystalizace v\u00fdrazn\u011b zv\u00fd\u0161\u00ed, zat\u00edmco krystaly maj\u00ed celkov\u011b men\u0161\u00ed rozm\u011bry ne\u017e u b\u011b\u017en\u00fdch vzork\u016f skla.<\/p>\n
Sulfid m\u011b\u010fnat\u00fd a surov\u00e9 inkluze oxidu m\u011b\u010fnat\u00e9ho nalezen\u00e9 ve skle s obsahem oxidu hlinit\u00e9ho jsou skute\u010dn\u011b z\u00e1hadn\u00e9, co\u017e nazna\u010duje, \u017ee se do skla dostaly pravd\u011bpodobn\u011b spole\u010dn\u00fdm taven\u00edm oxidick\u00e9 a sulfidick\u00e9 m\u011bdi, i kdy\u017e by pravd\u011bpodobn\u011b \u0159emesln\u00edci museli vynalo\u017eit dlouh\u00e9 a nam\u00e1hav\u00e9 \u00fasil\u00ed, aby z nich o\u010distili matn\u00e9 n\u00e1nosy, ne\u017e se do nich inkluze dostaly.<\/p>\n
Oxid hlinit\u00fd (g-Al2O3), kter\u00fd se nach\u00e1z\u00ed ve skle oxidu hlinit\u00e9ho, m\u00e1 mnoho jedine\u010dn\u00fdch a v\u00fdhodn\u00fdch vlastnost\u00ed, v\u010detn\u011b vysok\u00e9ho bodu t\u00e1n\u00ed a teplotn\u00ed stability, d\u00edky \u010demu\u017e je vhodn\u00fd pro pou\u017eit\u00ed v keramick\u00fdch \u017e\u00e1ruvzdorn\u00fdch materi\u00e1lech, le\u0161tic\u00edch materi\u00e1lech a brusn\u00fdch aplikac\u00edch. Pr\u016fmyslov\u00e9 vyu\u017eit\u00ed t\u00e9to slo\u017eky nav\u00edc zahrnuje pou\u017eit\u00ed jako zpomalova\u010de ho\u0159en\u00ed\/roztoky pro potla\u010den\u00ed kou\u0159e a tak\u00e9 jako z\u00e1kladn\u00ed surovinu p\u0159i v\u00fdrob\u011b oxidu hlinit\u00e9ho i mnoha speci\u00e1ln\u00edch slitin.<\/p>\n
Mikrostruktura keramiky VC infiltrovan\u00e9 oxidem hlinit\u00fdm se u jednotliv\u00fdch vzork\u016f v\u00fdrazn\u011b li\u0161\u00ed. Obecn\u011b maj\u00ed tendenci b\u00fdt zrnit\u00e9 s p\u0159\u00edtomnost\u00ed mal\u00fdch krystal\u016f oxidu hlinit\u00e9ho a zrn \u017eivce. Vzorky GS028 a GS022 se v\u0161ak vyzna\u010duj\u00ed v\u011bt\u0161\u00edmi krystaly, kter\u00e9 maj\u00ed stejn\u00fd tvar, p\u0159i\u010dem\u017e n\u011bkter\u00e9 vzorky dokonce vykazuj\u00ed zn\u00e1mky ne\u00fapln\u00e9ho rozpadu c\u00ednov\u00e9ho kalku na kubick\u00e9 krystaly oxidu c\u00edni\u010dit\u00e9ho p\u0159\u00edtomn\u00e9 jako acikul\u00e1rn\u00ed krystaly oxidu c\u00edni\u010dit\u00e9ho olova, kter\u00e9 se vytvo\u0159ily. Tato zrna jsou pak uzav\u0159ena v m\u011bkk\u00e9 b\u00edl\u00e9 silik\u00e1tov\u00e9 matrici tvo\u0159en\u00e9 matric\u00ed hlinitok\u0159emi\u010ditanu sodn\u00e9ho.<\/p>\n
Tato matrice vykazuje n\u00edzk\u00fd obsah ho\u0159\u010d\u00edku (1,5 hm.%), co\u017e nazna\u010duje, \u017ee p\u00edsek pou\u017eit\u00fd ke skl\u00e1\u0159sk\u00e9 v\u00fdrob\u011b byl z\u00edsk\u00e1n z miner\u00e1ln\u00edch zdroj\u016f, jako je k\u0159emen nebo plagioklasov\u00e9 koncov\u00e9 \u010dleny \u017eivc\u016f, jako\u017e i oxid hlinit\u00fd; d\u016fkazem pro tuto hypot\u00e9zu je velk\u00fd pod\u00edl alkalick\u00fdch \u017eivc\u016f nalezen\u00fdch v jej\u00edch vzorc\u00edch, jako\u017e i prom\u011bnliv\u00e9 mno\u017estv\u00ed p\u0159\u00edtomn\u00e9ho plagioklasu a k\u0159emene.<\/p>\n
Experimenty proveden\u00e9 pomoc\u00ed XRD a neutronov\u00e9 difrakce ukazuj\u00ed, \u017ee g-Al2O3 vykazuje krystalickou strukturu s vysok\u00fdm bodem t\u00e1n\u00ed a teplotn\u00ed stabilitou, spolu s neobvykl\u00fdm ostr\u00fdm p\u00edkem p\u0159i 1,52 A-1, kter\u00fd odpov\u00edd\u00e1 pseudobraggov\u00fdm rovin\u00e1m generuj\u00edc\u00edm se pod\u00e9l dutiny; to se zna\u010dn\u011b li\u0161\u00ed od b\u011b\u017en\u00fdch sklotvorn\u00fdch oxid\u016f, proto\u017ee to ukazuje, \u017ee tato receptura vytv\u00e1\u0159\u00ed strukturn\u011b odli\u0161n\u00e9 skloviny.<\/p>\n
V\u00fdsledky tohoto v\u00fdzkumu ukazuj\u00ed, \u017ee sklem infiltrovan\u00e1 keramika s obsahem oxidu hlinit\u00e9ho byla vyr\u00e1b\u011bna podle inovativn\u00ed a historicky v\u00fdznamn\u00e9 receptury, kter\u00e1 se v\u00fdrazn\u011b li\u0161ila od tradi\u010dn\u00edch receptur archeologick\u00e9ho skla, pokud jde o jej\u00ed modifikaci s c\u00edlem sn\u00ed\u017eit probl\u00e9my se z\u00e1kalem spojen\u00fdm se skly s vysok\u00fdm obsahem oxidu hlinit\u00e9ho.<\/p>\n
Hlin\u00edk je kl\u00ed\u010dov\u00fdm prvkem v\u00fdrobk\u016f z nepr\u016fst\u0159eln\u00e9ho skla d\u00edky sv\u00e9 vynikaj\u00edc\u00ed odolnosti v\u016f\u010di tlaku a tvrdosti, co\u017e z n\u011bj \u010din\u00ed z\u00e1kladn\u00ed materi\u00e1l v technick\u00e9 nebo pokro\u010dil\u00e9 keramice ur\u010den\u00e9 pro extr\u00e9mn\u00ed prost\u0159ed\u00ed s po\u017eadavky na tepelnou stabilitu a zv\u00fd\u0161enou odolnost proti opot\u0159eben\u00ed. Pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd lze tak\u00e9 m\u00edchat s jin\u00fdmi materi\u00e1ly a vyr\u00e1b\u011bt z n\u011bj jedine\u010dn\u00e9 sklen\u011bn\u00e9 nebo keramick\u00e9 v\u00fdrobky r\u016fzn\u00fdch barev, tvar\u016f a velikost\u00ed a tak\u00e9 p\u0159id\u00e1vat do r\u016fzn\u00fdch skl\u00e1\u0159sk\u00fdch proces\u016f, jako jsou procesy v\u00fdroby hlinitok\u0159emi\u010dit\u00e9ho skla proslul\u00e9 svou extr\u00e9mn\u00ed chemickou a tepelnou odolnost\u00ed.<\/p>\n
Hlin\u00edk se pou\u017e\u00edv\u00e1 v mnoha pr\u016fmyslov\u00fdch aplikac\u00edch, od \u017e\u00e1ruvzdorn\u00fdch materi\u00e1l\u016f a keramiky a\u017e po le\u0161tic\u00ed a brusn\u00e9 v\u00fdrobky. Oxid hlinit\u00fd je tak\u00e9 d\u016fle\u017eitou slo\u017ekou zpomalova\u010d\u016f ho\u0159en\u00ed a l\u00e1tek potla\u010duj\u00edc\u00edch kou\u0159, stejn\u011b jako l\u00e9ka\u0159sk\u00fdch p\u0159\u00edstroj\u016f, automobilov\u00e9ho a leteck\u00e9ho pr\u016fmyslu. Krom\u011b toho se d\u00edky sv\u00fdm pevnostn\u00edm vlastnostem a odolnosti proti korozi \u010dasto kombinuje s materi\u00e1ly, jako je oxid k\u0159emi\u010dit\u00fd nebo v\u00e1pno, pro dosa\u017een\u00ed optim\u00e1ln\u00edch vlastnost\u00ed v ur\u010dit\u00fdch aplikac\u00edch.<\/p>\n
V\u011bdci prov\u00e1d\u011bj\u00ed studie, jejich\u017e c\u00edlem je zv\u00fd\u0161it tv\u00e1rnost oxidu hlinit\u00e9ho t\u00edm, \u017ee jej vytvo\u0159\u00ed v p\u016fvodn\u00edm amorfn\u00edm stavu, nikoli ve form\u011b krystal\u016f. Jejich v\u00fdzkumy odhalily, \u017ee tato forma umo\u017e\u0148uje deformaci p\u0159i pokojov\u00e9 teplot\u011b ve srovn\u00e1n\u00ed s jednoslo\u017ekov\u00fdmi oxidov\u00fdmi skly, kter\u00e1 tuto vlastnost nevykazuj\u00ed. Jejich v\u00fdzkum nazna\u010duje, \u017ee k v\u00fdrob\u011b t\u00e9to formy lze pou\u017e\u00edt pulzn\u00ed laserov\u00e9 nan\u00e1\u0161en\u00ed, p\u0159i n\u011bm\u017e se vytvo\u0159\u00ed amorfn\u00ed film a po jeho vytvo\u0159en\u00ed se rychle ochlad\u00ed.<\/p>\n
Rychl\u00e9 ochlazen\u00ed umo\u017e\u0148uje molekul\u00e1rn\u00edm vazb\u00e1m uvolnit se a reformovat se p\u0159i rozta\u017een\u00ed, \u010d\u00edm\u017e se mechanick\u00e9 nap\u011bt\u00ed rozpt\u00fdl\u00ed a nesoust\u0159ed\u00ed se v koncentrovan\u00fdch m\u00edstech, \u010d\u00edm\u017e se zabr\u00e1n\u00ed vzniku ostr\u00fdch trhlin. Tento typ tv\u00e1rnosti se podob\u00e1 sp\u00ed\u0161e keramice ne\u017e typick\u00fdm sklen\u011bn\u00fdm v\u00fdrobk\u016fm.<\/p>\n
Jedn\u00edm ze zp\u016fsob\u016f, jak zv\u00fd\u0161it tv\u00e1rnost oxidu hlinit\u00e9ho, je p\u0159id\u00e1n\u00ed dal\u0161\u00edch miner\u00e1l\u016f do skeln\u00e9 matrice. Nap\u0159\u00edklad hlinitok\u0159emi\u010dit\u00e9 sklo kombinuje 57-60% oxidu k\u0159emi\u010dit\u00e9ho (SiO2) s 16-20% oxidu hlinit\u00e9ho (Al2O3), 5-7% oxidu v\u00e1penat\u00e9ho (CaO), 6-12% oxidu ho\u0159e\u010dnat\u00e9ho (MgO) a oxidu b\u00f3ru (B2O3); tento typ je zn\u00e1m\u00fd t\u00edm, \u017ee je odoln\u00fd proti po\u0161kr\u00e1b\u00e1n\u00ed mobiln\u00edch za\u0159\u00edzen\u00ed.<\/p>\n
Pro v\u00fdrobu korundov\u00e9ho skla se mus\u00ed pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd nejprve rozpra\u0161ovat s polyvinylalkoholov\u00fdm pojivem, aby se vytvo\u0159ilo snadno tvarovateln\u00e9 zelen\u00e9 t\u011bleso. Po zformov\u00e1n\u00ed lze tyto granule d\u00e1le zpracov\u00e1vat a tvarovat do r\u016fzn\u00fdch sklen\u011bn\u00fdch a keramick\u00fdch v\u00fdrobk\u016f pomoc\u00ed such\u00e9ho lisov\u00e1n\u00ed, vytla\u010dov\u00e1n\u00ed, vst\u0159ikov\u00e1n\u00ed nebo izostatick\u00e9ho lisov\u00e1n\u00ed za tepla.<\/p>\n
Jak ji\u017e n\u00e1zev napov\u00edd\u00e1, sklo z oxidu hlinit\u00e9ho za\u010d\u00edn\u00e1 oxidem hlinit\u00fdm (Al2O3) nebo \u010dast\u011bji ozna\u010dovan\u00fdm jako \"alumina\". V\u00fdrobci kovov\u00e9ho hlin\u00edku t\u011b\u017e\u00ed tento miner\u00e1l ze Zem\u011b a pot\u00e9 jej zpracov\u00e1vaj\u00ed na b\u00edl\u00fd pr\u00e1\u0161ek, kter\u00fd se pou\u017e\u00edv\u00e1 k v\u00fdrob\u011b skla. Na rozd\u00edl od skel na b\u00e1zi oxidu k\u0159emi\u010dit\u00e9ho, nap\u0159\u00edklad skel vyr\u00e1b\u011bn\u00fdch z k\u0159emi\u010dit\u00e9ho pr\u00e1\u0161ku, v\u0161ak oxid hlinit\u00fd nem\u00e1 tv\u00e1rn\u00e9 vlastnosti pot\u0159ebn\u00e9 pro ur\u010dit\u00e9 aplikace - v\u011bdci zaznamenali, \u017ee se deformuje pouze za specifick\u00fdch podm\u00ednek, nap\u0159\u00edklad p\u0159i rychl\u00e9m ochlazen\u00ed nebo p\u0159i extr\u00e9mn\u00edm zat\u00ed\u017een\u00ed.<\/p>\n
Erkka Frankberg z Technick\u00e9 univerzity v Tampere ve Finsku vedl t\u00fdm, jeho\u017e c\u00edlem bylo tuto p\u0159ek\u00e1\u017eku p\u0159ekonat. K tomu vyu\u017eili p\u0159\u00edstup sest\u00e1vaj\u00edc\u00ed z atomistick\u00e9ho modelov\u00e1n\u00ed, experiment\u00e1ln\u00edch m\u011b\u0159en\u00ed a simulac\u00ed molekul\u00e1rn\u00ed dynamiky, aby vytvo\u0159ili mikroskopick\u00e9 filmy oxidu hlinit\u00e9ho, kter\u00e9 umo\u017e\u0148uj\u00ed neomezenou plastickou deformaci.<\/p>\n
V\u011bdci nast\u0159\u00edkali pr\u00e1\u0161kov\u00fd oxid hlinit\u00fd na sklen\u011bn\u00e9 kuli\u010dky a pot\u00e9 je zah\u0159\u00e1li na teplotu t\u011bsn\u011b nad teplotou skeln\u00e9ho p\u0159echodu, ale pod bodem krystalizace. P\u0159ed proveden\u00edm anal\u00fdz, jako je rentgenov\u00e1 difrakce a diferenci\u00e1ln\u00ed termick\u00e1 anal\u00fdza, nechali kuli\u010dky rychle vychladnout. Jejich experimenty zjistily, \u017ee skla s oxidem hlinit\u00fdm se mohou p\u0159ed prasknut\u00edm rozt\u00e1hnout a\u017e o 8%, co\u017e je v\u00fdrazn\u011b v\u00edce ne\u017e u oxidu k\u0159emi\u010dit\u00e9ho, pro kter\u00fd je typick\u00e9 rozta\u017een\u00ed 2-2% a stla\u010den\u00ed 4-40% p\u0159ed prasknut\u00edm.<\/p>\n
Frankberg\u016fv t\u00fdm zkoumal mikrostrukturu korundov\u00e9ho skla. Pozorovali jeho vysoce bezdefektn\u00ed, atom\u00e1rn\u011b t\u011bsnou s\u00ed\u0165 molekul, kter\u00e1 umo\u017e\u0148ovala snadn\u00e9 p\u0159ep\u00edn\u00e1n\u00ed p\u0159i nam\u00e1h\u00e1n\u00ed. Naopak k\u0159emenn\u00e9 sklo m\u00e1 ve sv\u00e9 atom\u00e1rn\u00ed struktu\u0159e v\u00edce mezer, \u010d\u00edm\u017e je jeho schopnost deformace omezena.<\/p>\n
V\u011bdci navrhli sklo z oxidu hlinit\u00e9ho s oxidy vz\u00e1cn\u00fdch prvk\u016f wolframu a tantalu, aby dos\u00e1hli jedine\u010dn\u00fdch vlastnost\u00ed, jako je elektrick\u00e1 vodivost a odolnost v\u016f\u010di chemick\u00fdm vliv\u016fm, vysok\u00e1 pevnost a extr\u00e9mn\u00ed tvrdost (9 stup\u0148\u016f Mohsovy stupnice).<\/p>\n
V\u00fdzkumn\u00fd t\u00fdm zat\u00edm nevyvinul \u00fa\u010dinn\u00fd proces v\u00fdroby skla z oxidu hlinit\u00e9ho pro komer\u010dn\u00ed \u00fa\u010dely, nicm\u00e9n\u011b jeho potenci\u00e1l vid\u00ed optimisticky. Jejich dal\u0161\u00ed kroky zahrnuj\u00ed dal\u0161\u00ed studium toho, co je p\u0159\u00ed\u010dinou jeho fungov\u00e1n\u00ed, a teprve pot\u00e9 pou\u017eij\u00ed sv\u00e9 poznatky k v\u00fdvoji dal\u0161\u00edch typ\u016f skla s u\u017eite\u010dn\u00fdmi vlastnostmi.<\/p>","protected":false},"excerpt":{"rendered":"
Glass sands used to manufacture high alumina glasses typically contain low percentages of magnesia. This mineral sand may come from […]<\/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":"","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","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-75","post","type-post","status-publish","format-standard","hentry","category-alumina-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts\/75","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/comments?post=75"}],"version-history":[{"count":1,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts\/75\/revisions"}],"predecessor-version":[{"id":76,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/posts\/75\/revisions\/76"}],"wp:attachment":[{"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/media?parent=75"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/categories?post=75"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aluminaceramics.net\/cs\/wp-json\/wp\/v2\/tags?post=75"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}