{"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\/sl\/studija-staranja-talkove-keramike-transformacija-med-kristali-magnezijevega-metasilikata\/","title":{"rendered":"\u0160tudija staranja keramike iz talka - transformacija med kristali magnezijevega metasilikata"},"content":{"rendered":"<p>Opravljene so bile obse\u017ene raziskave o pretvorbi med kristalnimi oblikami magnezijevega metasilikata. Vendar pa trenutno ni mogo\u010de trditi, da je to vpra\u0161anje povsem enotno in dokon\u010dno razumljeno. Vendar pa lahko rezultate, ki so jih leta 1962 dobili J. F. Sarver in drugi, uporabimo kot MgSiO<sub>3<\/sub> pri temperaturah, ni\u017ejih od 1400 \u2103 osnovne informacije o zakonih kristalne transformacije. Saville et al. so zagotovili MgSiO<sub>3<\/sub> Fazni diagram T-P ka\u017ee, da je glavna kristalna faza, ki nastane med \u017eganjem keramike iz talka, prvotni enstatit, ki se ohladi na 1042 \u2103 (izmerjeno z metodo du\u0161enja). Rezultat, pridobljen z metodo visokotemperaturne rentgenske difrakcije, je 1035 \u2103, med 865 \u2103 pa obstaja te\u017enja po preoblikovanju v enstatit, pod 865 \u2103 pa obstaja te\u017enja po preoblikovanju v metastabilni kristalini\u010dni klinopiroksen. Pod 865 \u2103 lahko metastabilni kristalini\u010dni klinopiroksen obstaja dolgo \u010dasa in se ne bo pretvoril v termodinamsko stabilen klinopiroksen. Staranje ali pra\u0161enje keramike iz talka je posledica pretvorbe visokotemperaturne kristalini\u010dne faze primarnega enstatita v enstatit ali klinopiroksen med ohlajanjem, name\u0161\u010danjem in uporabo.<\/p>\n<p>Glede na teoreti\u010dno gostoto, izra\u010dunano iz parametrov re\u0161etke, je razvidno, da pretvorbo primarnega enstatita v klinopiroksen pri sobni temperaturi spremlja sprememba prostornine za pribli\u017eno 2,8%, sprememba prostornine pri pretvorbi primarnega enstatita v enstatit pa je \u0161e ve\u010dja. Ker je sprememba prostornine skupni rezultat skraj\u0161anja kristalne osi c in podalj\u0161anja osi b, je vpliv spremembe dol\u017eine zrn med procesom pretvorbe neizogibno izrazitej\u0161i od tistega, ki se odra\u017ea v vrednosti spremembe prostornine, \u010de ga analiziramo na podlagi parametrov mre\u017ee. Velika deformacija, ki spremlja proces pretvorbe, neizogibno ustvarja velike napetosti, u\u010dinek te napetosti zaradi fazne spremembe pa je neposrednej\u0161i razlog za staranje ali drobljenje talka. Izvirni enstatit je glavna kristalna faza talka, odli\u010dna zmogljivost talkove keramike pa je neposredno povezana z izvirnim enstatitom. Tako re\u0161evanje problema staranja ali pra\u0161enja talka postane problem, kako stabilizirati prvotni enstatit, da se med ohlajanjem, name\u0161\u010danjem in uporabo ne spremeni v enstatit ali klinopiroksen.<\/p>","protected":false},"excerpt":{"rendered":"<p>Extensive research has been conducted on the conversion between crystal forms of magnesium metasilicate. However, at present, it cannot be [&hellip;]<\/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\/sl\/wp-json\/wp\/v2\/posts\/19","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/comments?post=19"}],"version-history":[{"count":4,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/posts\/19\/revisions"}],"predecessor-version":[{"id":23,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/posts\/19\/revisions\/23"}],"wp:attachment":[{"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/media?parent=19"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/categories?post=19"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/tags?post=19"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}