{"id":17,"date":"2023-11-07T13:38:48","date_gmt":"2023-11-07T05:38:48","guid":{"rendered":"https:\/\/artehistoria.net\/?p=17"},"modified":"2023-11-07T13:38:48","modified_gmt":"2023-11-07T05:38:48","slug":"performance-advantages-and-disadvantages-of-talc-ceramics","status":"publish","type":"post","link":"https:\/\/artehistoria.net\/fi\/talkkikeramiikan-suorituskyvyn-edut-ja-haitat\/","title":{"rendered":"Talkkikeramiikan suorituskyky, edut ja haitat"},"content":{"rendered":"<p>Talkkikeramiikka, joka tunnetaan my\u00f6s nimell\u00e4 lohkotalkkikeramiikka tai talkkikeramiikka, on er\u00e4\u00e4nlaista suurtaajuuslaitekeramiikkaa, jolla on erinomaiset s\u00e4hk\u00f6iset ominaisuudet. Talkkiposliinin alhainen dielektrisyysvakio (yleens\u00e4 e=6-7); dielektrisen h\u00e4vi\u00f6kulman tan\u03b4 alhainen tangenttiarvo vaihtelee v\u00e4lill\u00e4 (3-20) \u00d7 10 %.<sup>-4<\/sup>, eristyslujuus on yleens\u00e4 20-30 kV\/mm ja tilavuusvastus on korkea (tilavuusvastus 100 \u2103:ssa on noin 10<sup>14<\/sup>\u03a9- cm), staattinen taivutuslujuus on yleens\u00e4 120-200MPa, ja kemiallinen stabiilisuus on hyv\u00e4, haponkest\u00e4v\u00e4, alkalin ja korroosionkest\u00e4v\u00e4. Taajuusominaisuuksien n\u00e4k\u00f6kulmasta talkkikeramiikan dielektrisyysvakio pienenee taajuuden kasvaessa ja muuttuu v\u00e4h\u00e4n l\u00e4mp\u00f6tilan kasvaessa korkeilla taajuuksilla. Tan\u03b4 Kohdassa f=10<sup>6<\/sup>Hz:n taajuus v\u00e4heni taajuuden kasvaessa, joten se osoittaa t\u00e4ysin talkkikeramiikan edut, kun sit\u00e4 k\u00e4ytet\u00e4\u00e4n suurtaajuuslaitteiden keramiikkana. Talkkikeramiikan korkean eristyslujuuden, alhaisen dielektrisen h\u00e4vi\u00f6n ja erinomaisten suurtaajuusominaisuuksien ansiosta, vaikka dielektrisyysvakio ei ole riitt\u00e4v\u00e4n korkea, sit\u00e4 voidaan silti k\u00e4ytt\u00e4\u00e4 suurj\u00e4nnitteisen\u00e4 suuritehoisena keraamisena kondensaattorina. Suuritehoisena keraamisena kondensaattorina k\u00e4ytett\u00e4v\u00e4n pienih\u00e4vi\u00f6isen talkkikeramiikan dielektrisen h\u00e4vi\u00f6kulman tangentin arvo voi olla (3,5-4) \u00d7 10<sup>-4<\/sup>.<\/p>\n<p>Talkkikeramiikassa on my\u00f6s puute, johon on kiinnitett\u00e4v\u00e4 riitt\u00e4v\u00e4sti huomiota: jos tuotannonohjaus on virheellinen, talkkiposliinia ei voida sijoittaa oikein. Tai vanhenemisilmi\u00f6 voi esiinty\u00e4 k\u00e4yt\u00f6n aikana, mik\u00e4 johtuu kiteisen p\u00e4\u00e4faasin magnesiummetasilikaatin kiteisest\u00e4 muunnoksesta, mik\u00e4 johtaa keraamisen jauheen muodostumiseen, halkeiluun, lujuuden v\u00e4henemiseen ja dielektristen ominaisuuksien heikkenemiseen; Sintrausalue on kapea, yleens\u00e4 vain noin 20 \u2103. Jos sintrauksen valvonta ei ole hyv\u00e4, se aiheuttaa usein muodonmuutoksia, rakkuloita, pehmusteiden liimausta ja tuottaa j\u00e4tteit\u00e4. K\u00e4yt\u00e4nt\u00f6 on osoittanut, ett\u00e4 talkkikeramiikan tuotannossa, jos raaka-aineita, kaavaa tai tuotantoprosessia ei valvota asianmukaisesti, ik\u00e4\u00e4ntyminen tapahtuu usein. Kun se tapahtuu, se aiheuttaa vakavia haittoja ja menetyksi\u00e4 tuotannolle ja k\u00e4yt\u00f6lle, ja ik\u00e4\u00e4ntymisilmi\u00f6t\u00e4 on arvostettava suuresti. Tutkimus on vahvistanut, ett\u00e4 talkkikeramiikan ik\u00e4\u00e4ntyminen tai pulveroituminen johtuu magnesiummetasilikaatin (MgSiO<sub>3<\/sub>), joka on talkkikeramiikan t\u00e4rkein kiteinen faasi, sek\u00e4 kiteen muuntumisprosessin aikana tapahtuvan rasituksen ja j\u00e4nnityksen vaikutukset.<\/p>","protected":false},"excerpt":{"rendered":"<p>Talc ceramics, also known as block talc ceramics or talc ceramics, are a type of high-frequency device ceramics with excellent [&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-17","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/posts\/17","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/comments?post=17"}],"version-history":[{"count":1,"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/posts\/17\/revisions"}],"predecessor-version":[{"id":18,"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/posts\/17\/revisions\/18"}],"wp:attachment":[{"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/media?parent=17"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/categories?post=17"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artehistoria.net\/fi\/wp-json\/wp\/v2\/tags?post=17"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}