{"id":19,"date":"2023-11-07T13:59:53","date_gmt":"2023-11-07T05:59:53","guid":{"rendered":"https:\/\/artehistoria.net\/?p=19"},"modified":"2023-11-07T14:17:24","modified_gmt":"2023-11-07T06:17:24","slug":"study-on-aging-of-talc-ceramics-transformation-between-magnesium-metasilicate-crystals","status":"publish","type":"post","link":"https:\/\/artehistoria.net\/cs\/studium-starnuti-mastkove-keramiky-transformace-mezi-krystaly-metasilikatu-horecnateho\/","title":{"rendered":"Studie st\u00e1rnut\u00ed mastkov\u00e9 keramiky - transformace mezi krystaly metasilik\u00e1tu ho\u0159e\u010dnat\u00e9ho"},"content":{"rendered":"<p>Byl proveden rozs\u00e1hl\u00fd v\u00fdzkum p\u0159em\u011bny mezi krystalick\u00fdmi formami metasilik\u00e1tu ho\u0159e\u010dnat\u00e9ho. V sou\u010dasn\u00e9 dob\u011b v\u0161ak nelze m\u00edt za to, \u017ee existuje zcela jednotn\u00fd a definitivn\u00ed pohled na tuto problematiku. V\u00fdsledky, kter\u00e9 v roce 1962 z\u00edskali J. F. Sarver a kol. v\u0161ak mohou b\u00fdt pou\u017eity jako MgSiO<sub>3<\/sub> p\u0159i teplot\u00e1ch ni\u017e\u0161\u00edch ne\u017e 1400 \u2103 z\u00e1kladn\u00ed informace o z\u00e1konech krystalov\u00e9 p\u0159em\u011bny. Saville a kol. poskytli MgSiO<sub>3<\/sub> Z f\u00e1zov\u00e9ho diagramu T-P vypl\u00fdv\u00e1, \u017ee hlavn\u00ed krystalickou f\u00e1z\u00ed vznikaj\u00edc\u00ed p\u0159i v\u00fdpalu mastkov\u00e9 keramiky je p\u016fvodn\u00ed enstatit, kter\u00fd se ochlad\u00ed na 1042 \u2103 (m\u011b\u0159eno metodou kalen\u00ed). V\u00fdsledek z\u00edskan\u00fd metodou vysokoteplotn\u00ed rentgenov\u00e9 difrakce je 1035 \u2103 a mezi 865 \u2103 je tendence k p\u0159em\u011bn\u011b na enstatit a pod 865 \u2103 je tendence k p\u0159em\u011bn\u011b na metastabiln\u00ed krystalick\u00fd klinopyroxen. Pod 865 \u2103 m\u016f\u017ee metastabiln\u00ed krystalick\u00fd klinopyroxen existovat po dlouhou dobu a nebude se p\u0159em\u011b\u0148ovat na termodynamicky stabiln\u00ed klinopyroxen. St\u00e1rnut\u00ed nebo rozpr\u00e1\u0161en\u00ed mastkov\u00e9 keramiky je zp\u016fsobeno p\u0159em\u011bnou vysokoteplotn\u00ed krystalick\u00e9 f\u00e1ze prim\u00e1rn\u00edho enstatitu na enstatit nebo klinopyroxen b\u011bhem chlazen\u00ed, ukl\u00e1d\u00e1n\u00ed a pou\u017e\u00edv\u00e1n\u00ed.<\/p>\n<p>Podle teoretick\u00e9 hustoty vypo\u010dten\u00e9 z m\u0159\u00ed\u017ekov\u00fdch parametr\u016f je patrn\u00e9, \u017ee p\u0159em\u011bna prim\u00e1rn\u00edho enstatitu na klinopyroxen je p\u0159i pokojov\u00e9 teplot\u011b doprov\u00e1zena objemovou zm\u011bnou p\u0159ibli\u017en\u011b 2,8% a objemov\u00e1 zm\u011bna p\u0159i p\u0159em\u011bn\u011b prim\u00e1rn\u00edho enstatitu na enstatit je je\u0161t\u011b v\u011bt\u0161\u00ed. Pokud se analyzuje z m\u0159\u00ed\u017ekov\u00fdch parametr\u016f, proto\u017ee objemov\u00e1 zm\u011bna je celkov\u00fdm v\u00fdsledkem zkr\u00e1cen\u00ed krystalov\u00e9 osy c a prodlou\u017een\u00ed osy b, je vliv zm\u011bny d\u00e9lky zrn b\u011bhem procesu p\u0159em\u011bny nevyhnuteln\u011b v\u00fdrazn\u011bj\u0161\u00ed ne\u017e vliv, kter\u00fd odr\u00e1\u017e\u00ed hodnota objemov\u00e9 zm\u011bny. Velk\u00e1 deformace doprov\u00e1zej\u00edc\u00ed proces p\u0159em\u011bny nevyhnuteln\u011b vytv\u00e1\u0159\u00ed velk\u00e9 nap\u011bt\u00ed a vliv tohoto nap\u011bt\u00ed p\u0159i f\u00e1zov\u00e9 zm\u011bn\u011b je bezprost\u0159edn\u011bj\u0161\u00ed p\u0159\u00ed\u010dinou st\u00e1rnut\u00ed nebo rozm\u011bln\u011bn\u00ed mastku. P\u016fvodn\u00ed enstatit je hlavn\u00ed krystalickou f\u00e1z\u00ed mastkov\u00e9ho porcel\u00e1nu a vynikaj\u00edc\u00ed vlastnosti mastkov\u00e9 keramiky p\u0159\u00edmo souvisej\u00ed s p\u016fvodn\u00edm enstatitem. \u0158e\u0161en\u00ed probl\u00e9mu st\u00e1rnut\u00ed nebo pulverizace mastkov\u00e9ho porcel\u00e1nu se tak st\u00e1v\u00e1 probl\u00e9mem, jak stabilizovat p\u016fvodn\u00ed enstatit, aby se b\u011bhem chlazen\u00ed, ukl\u00e1d\u00e1n\u00ed a pou\u017e\u00edv\u00e1n\u00ed nep\u0159em\u011bnil na enstatit nebo klinopyroxen.<\/p>","protected":false},"excerpt":{"rendered":"<p>Byl proveden rozs\u00e1hl\u00fd v\u00fdzkum p\u0159em\u011bny mezi krystalick\u00fdmi formami metasilik\u00e1tu ho\u0159e\u010dnat\u00e9ho. V sou\u010dasn\u00e9 dob\u011b v\u0161ak nelze [...]<\/p>","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":[2],"tags":[],"class_list":["post-19","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/19","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/comments?post=19"}],"version-history":[{"count":4,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/19\/revisions"}],"predecessor-version":[{"id":23,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/posts\/19\/revisions\/23"}],"wp:attachment":[{"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/media?parent=19"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/categories?post=19"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artehistoria.net\/cs\/wp-json\/wp\/v2\/tags?post=19"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}