{"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\/sl\/prednosti-in-slabosti-talka-v-keramiki\/","title":{"rendered":"Uspe\u0161nost, prednosti in slabosti talkove keramike"},"content":{"rendered":"<p>Keramika iz talka, znana tudi kot blokovska keramika iz talka ali keramika iz talka, je vrsta keramike za visokofrekven\u010dne naprave z odli\u010dnimi elektri\u010dnimi lastnostmi. Nizka dielektri\u010dna konstanta talka (obi\u010dajno e=6-7); nizka vrednost tangensa kota dielektri\u010dnih izgub tan\u03b4, ki niha med (3-20) \u00d710<sup>-4<\/sup>, izolacijska trdnost je obi\u010dajno 20-30 kV\/mm, prostorninska upornost pa je visoka (prostorninska upornost pri 100 \u2103 je pribli\u017eno do 10<sup>14<\/sup>\u03a9- cm), stati\u010dna upogibna trdnost je obi\u010dajno 120-200 MPa, kemijska stabilnost pa je dobra, odporna na kisline, alkalijo in korozijo. Z vidika frekven\u010dnih zna\u010dilnosti se dielektri\u010dna konstanta keramike iz talka z nara\u0161\u010dajo\u010do frekvenco zmanj\u0161uje, pri visokih frekvencah pa se z nara\u0161\u010dajo\u010do temperaturo le malo spreminja. Tan\u03b4 Pri f=10<sup>6<\/sup>Hz se s pove\u010devanjem frekvence zmanj\u0161uje, zato v celoti dokazuje prednosti keramike iz talka pri uporabi kot keramike za visokofrekven\u010dne naprave. Zaradi visoke izolacijske trdnosti, nizkih dielektri\u010dnih izgub in odli\u010dnih visokofrekven\u010dnih lastnosti keramike iz talka, \u010deprav dielektri\u010dna konstanta ni dovolj visoka, se lahko \u0161e vedno uporablja kot visokonapetostni kerami\u010dni kondenzator visoke mo\u010di. Keramika iz talka z nizkimi izgubami, ki se uporablja kot visokonapetostni kerami\u010dni kondenzator, ima vrednost kotnega tangensa dielektri\u010dnih izgub, ki lahko dose\u017ee (3,5-4) \u00d7 10<sup>-4<\/sup>.<\/p>\n<p>keramika iz talka ima tudi pomanjkljivost, ki ji je treba nameniti dovolj pozornosti: \u010de je nadzor proizvodnje neustrezen, porcelan iz talka ne bo pravilno name\u0161\u010den. Ali pa se med uporabo lahko pojavi pojav staranja, ki je posledica kristalne transformacije glavne kristalne faze magnezijevega metasilikata, kar povzro\u010di nastanek kerami\u010dnega prahu, razpoke, zmanj\u0161anje trdnosti in poslab\u0161anje dielektri\u010dnih lastnosti; obmo\u010dje sintranja je ozko, obi\u010dajno le okoli 20 \u2103. \u010ce nadzor sintranja ni dober, pogosto pride do deformacij, mehur\u010dkov, lepljenja oblog in nastajanja odpadnih izdelkov. Praksa je pokazala, da se pri proizvodnji keramike iz talka, \u010de surovine, formula ali proizvodni proces niso ustrezno nadzorovani, pogosto pojavi staranje. Ko se pojavi, povzro\u010di resno \u0161kodo in izgubo pri proizvodnji in uporabi, zato je treba pojav staranja zelo ceniti. Raziskave so potrdile, da je staranje ali pra\u0161enje keramike iz talka posledica kristalne transformacije magnezijevega metasilikata (MgSiO<sub>3<\/sub>), ki je glavna kristalna faza keramike iz talka, ter u\u010dinki deformacij in napetosti med procesom kristalne transformacije.<\/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\/sl\/wp-json\/wp\/v2\/posts\/17","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=17"}],"version-history":[{"count":1,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/posts\/17\/revisions"}],"predecessor-version":[{"id":18,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/posts\/17\/revisions\/18"}],"wp:attachment":[{"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/media?parent=17"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/categories?post=17"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artehistoria.net\/sl\/wp-json\/wp\/v2\/tags?post=17"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}