{"id":47687,"date":"2019-11-05T23:26:00","date_gmt":"2019-11-05T22:26:00","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-condutividade-termica-de-zirconio-definicao\/"},"modified":"2020-01-24T13:08:10","modified_gmt":"2020-01-24T12:08:10","slug":"o-que-e-condutividade-termica-de-zirconio-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condutividade-termica-de-zirconio-definicao\/","title":{"rendered":"O que \u00e9 condutividade t\u00e9rmica de zirc\u00f4nio &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Condutividade t\u00e9rmica de zirc\u00f4nio.\u00a0As ligas de zirc\u00f4nio t\u00eam menor condutividade t\u00e9rmica (cerca de 18 W \/ mK) do que o metal de zirc\u00f4nio puro (cerca de 22 W \/ mK).\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Condutividade t\u00e9rmica de zirc\u00f4nio<\/h2>\n<p><strong><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermal-conduction-thermal-conductivity-zirconium.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-20049 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermal-conduction-thermal-conductivity-zirconium-300x290.png\" alt=\"Condu\u00e7\u00e3o t\u00e9rmica - condutividade t\u00e9rmica - zirc\u00f4nio\" width=\"300\" height=\"290\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermal-conduction-thermal-conductivity-zirconium-300x290.png\" \/><\/a><\/strong><\/p>\n<p><strong>Condutividade t\u00e9rmica de zirc\u00f4nio<\/strong><\/p>\n<p><strong>O zirc\u00f4nio<\/strong>\u00a0\u00e9 um metal de transi\u00e7\u00e3o brilhante, branco-acinzentado e forte que se assemelha ao h\u00e1fnio e, em menor grau, ao tit\u00e2nio.\u00a0<strong>O zirc\u00f4nio<\/strong>\u00a0\u00e9 usado principalmente como refrat\u00e1rio e opacificante, embora pequenas quantidades sejam usadas como agente de liga por sua forte resist\u00eancia \u00e0 corros\u00e3o.\u00a0A liga de zirc\u00f4nio (por exemplo, Zr + 1% Nb) \u00e9 amplamente utilizada como revestimento para combust\u00edveis de reatores nucleares.\u00a0As propriedades desejadas dessas ligas s\u00e3o uma se\u00e7\u00e3o transversal de captura de n\u00eautrons baixa e resist\u00eancia \u00e0 corros\u00e3o em condi\u00e7\u00f5es normais de servi\u00e7o.\u00a0As ligas de zirc\u00f4nio t\u00eam menor condutividade t\u00e9rmica (cerca de 18 W \/ mK) do que o metal de zirc\u00f4nio puro (cerca de 22 W \/ mK).<\/p>\n<p>Refer\u00eancia especial: Propriedades termof\u00edsicas de materiais para engenharia nuclear: um tutorial e coleta de dados.\u00a0IAEA-THPH, IAEA, Viena, 2008. ISBN 978\u201392\u20130\u2013106508\u20137.<\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Condutividade t\u00e9rmica de metais<\/h2>\n<p><strong><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-metals-table.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-20066 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-metals-table.png\" alt=\"condutividade t\u00e9rmica - metais\" width=\"210\" height=\"388\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-metals-table.png\" \/><\/a>Os metais<\/strong>\u00a0s\u00e3o s\u00f3lidos e, como tal, possuem estrutura cristalina onde os \u00edons (n\u00facleos com suas camadas circunvizinhas de el\u00e9trons do n\u00facleo) ocupam posi\u00e7\u00f5es equivalentes em termos de tradu\u00e7\u00e3o na rede cristalina.\u00a0<strong>Os metais<\/strong>\u00a0em geral t\u00eam\u00a0<strong>alta condutividade el\u00e9trica<\/strong>\u00a0,\u00a0<strong>alta condutividade t\u00e9rmica<\/strong>\u00a0e alta densidade.\u00a0Consequentemente, o transporte de energia t\u00e9rmica pode ser devido a dois efeitos:<\/p>\n<ul>\n<li>a migra\u00e7\u00e3o de\u00a0<strong>el\u00e9trons livres<\/strong><\/li>\n<li>ondas vibracionais em treli\u00e7a (f\u00f4nons).<\/li>\n<\/ul>\n<p>Quando el\u00e9trons e f\u00f4nons transportam energia t\u00e9rmica, levando \u00e0 transfer\u00eancia de calor por condu\u00e7\u00e3o em um s\u00f3lido, a condutividade t\u00e9rmica pode ser expressa como:<\/p>\n<p>k = k\u00a0<sub>e<\/sub>\u00a0+ k\u00a0<sub>ph<\/sub><\/p>\n<p><span>A caracter\u00edstica \u00fanica dos metais no que diz respeito \u00e0 sua estrutura \u00e9 a presen\u00e7a de portadores de carga, especificamente\u00a0<\/span><strong><span>el\u00e9trons<\/span><\/strong><span>\u00a0.\u00a0As condutividades el\u00e9tricas e t\u00e9rmicas dos metais se\u00a0<\/span><strong><span>originam do<\/span><\/strong><span>\u00a0fato de seus\u00a0<\/span><strong><span>el\u00e9trons externos serem deslocalizados<\/span><\/strong><span>\u00a0.\u00a0Sua contribui\u00e7\u00e3o para a condutividade t\u00e9rmica \u00e9 chamada de\u00a0<\/span><strong><span>condutividade t\u00e9rmica eletr\u00f4nica, k\u00a0<\/span><sub><span>e<\/span><\/sub><\/strong><span>\u00a0.\u00a0De fato, em metais puros como ouro, prata, cobre e alum\u00ednio, a corrente de calor associada ao fluxo de el\u00e9trons excede em muito uma pequena contribui\u00e7\u00e3o devido ao fluxo de f\u00f4nons.\u00a0Por outro lado, para as ligas, a contribui\u00e7\u00e3o de k\u00a0<\/span><sub><span>ph<\/span><\/sub><span>\u00a0para k n\u00e3o \u00e9 mais desprez\u00edvel.<\/span><\/p>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Condutividade t\u00e9rmica de zirc\u00f4nio.\u00a0As ligas de zirc\u00f4nio t\u00eam menor condutividade t\u00e9rmica (cerca de 18 W \/ mK) do que o metal de zirc\u00f4nio puro (cerca de 22 W \/ mK).\u00a0Engenharia T\u00e9rmica Condutividade t\u00e9rmica de zirc\u00f4nio Condutividade t\u00e9rmica de zirc\u00f4nio O zirc\u00f4nio\u00a0\u00e9 um metal de transi\u00e7\u00e3o brilhante, branco-acinzentado e forte que se assemelha ao h\u00e1fnio e, &#8230; <a title=\"O que \u00e9 condutividade t\u00e9rmica de zirc\u00f4nio &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condutividade-termica-de-zirconio-definicao\/\" aria-label=\"More on O que \u00e9 condutividade t\u00e9rmica de zirc\u00f4nio &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 condutividade t\u00e9rmica de zirc\u00f4nio - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Condutividade t\u00e9rmica de zirc\u00f4nio. 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