{"id":119683,"date":"2023-02-08T02:38:58","date_gmt":"2023-02-08T01:38:58","guid":{"rendered":"https:\/\/material-properties.org\/o-que-e-invar-propriedades-e-usos-definicao\/"},"modified":"2023-02-15T08:31:28","modified_gmt":"2023-02-15T07:31:28","slug":"o-que-e-invar-propriedades-e-usos-definicao","status":"publish","type":"post","link":"https:\/\/material-properties.org\/pt-br\/o-que-e-invar-propriedades-e-usos-definicao\/","title":{"rendered":"O que \u00e9 Invar &#8211; Propriedades e Usos &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<p><span><div class=\"su-quote su-quote-style-default\"><div class=\"su-quote-inner su-u-clearfix su-u-trim\">Invar \u00e9 um grupo de ligas de n\u00edquel-ferro de baixa expans\u00e3o t\u00e9rmica, consistindo principalmente de n\u00edquel e ferro (por exemplo, FeNi36).\u00a0O nome Invar vem da palavra invari\u00e1vel, referindo-se \u00e0 sua relativa falta de expans\u00e3o ou contra\u00e7\u00e3o com mudan\u00e7as de temperatura.<\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><strong><span>Invar<\/span><\/strong><span>\u00a0\u00e9 um grupo de ligas de n\u00edquel-ferro de baixa expans\u00e3o t\u00e9rmica, consistindo principalmente de n\u00edquel e ferro (por exemplo, FeNi36).\u00a0O nome Invar vem da palavra invari\u00e1vel, referindo-se \u00e0 sua relativa\u00a0<\/span><strong><span>falta de expans\u00e3o ou contra\u00e7\u00e3o<\/span><\/strong><span>\u00a0com mudan\u00e7as de temperatura.\u00a0A liga Invar \u00e9 d\u00factil e facilmente sold\u00e1vel, e a usinabilidade \u00e9 semelhante ao a\u00e7o inoxid\u00e1vel austen\u00edtico.<\/span><\/p>\n<p><span>Invar \u00e9 usado onde \u00e9 necess\u00e1ria\u00a0<\/span><strong><span>alta estabilidade dimensional<\/span><\/strong><span>, como instrumentos de precis\u00e3o, rel\u00f3gios.\u00a0Ligas com baixos coeficientes de expans\u00e3o formam a parte essencial de\u00a0<\/span><strong><span>bimetais e termostatos<\/span><\/strong><span>.\u00a0O pr\u00f3prio Invar ainda \u00e9 usado hoje em um grande n\u00famero de eletrodom\u00e9sticos, de ferros el\u00e9tricos e torradeiras a fog\u00f5es a g\u00e1s e cortes de seguran\u00e7a contra inc\u00eandio.\u00a0Os Invars tamb\u00e9m podem ser usados \u200b\u200bem veda\u00e7\u00f5es vidro-metal e componentes eletr\u00f4nicos e de r\u00e1dio.\u00a0Quase todos os condensadores vari\u00e1veis \u200b\u200bs\u00e3o feitos de Invar.\u00a0Os suportes dos motores a jato s\u00e3o feitos de Invar para garantir rigidez com as mudan\u00e7as de temperatura.<\/span><\/p>\n<h2><span>Coeficiente de Expans\u00e3o T\u00e9rmica de Invar<\/span><\/h2>\n<p><span>O coeficiente linear de\u00a0<\/span><strong><span>expans\u00e3o t\u00e9rmica do invar \u2013 FeNi36<\/span><\/strong><span> de 25 a 105\u00b0C \u00e9 de cerca de 1,2 x 10<sup>-6<\/sup> K<sup>-1<\/sup><\/span><span>\u00a0<\/span><span>(1,2 ppm\/\u00b0C).<\/span><\/p>\n<p><span>O coeficiente linear de expans\u00e3o t\u00e9rmica de constantan de 25 a 105\u00b0C \u00e9 14,9 x 10<\/span><sup><span>-6<\/span><\/sup><span> K<\/span><sup><span>-1<\/span><\/sup><span>.<\/span><\/p>\n<p><strong><span>A expans\u00e3o t\u00e9rmica<\/span><\/strong><span> \u00e9 geralmente a tend\u00eancia da mat\u00e9ria de mudar suas dimens\u00f5es em resposta a uma mudan\u00e7a de temperatura.\u00a0Geralmente \u00e9 expresso como uma mudan\u00e7a fracion\u00e1ria no comprimento ou volume por unidade de mudan\u00e7a de temperatura.\u00a0A expans\u00e3o t\u00e9rmica \u00e9 comum para s\u00f3lidos, l\u00edquidos e gases.\u00a0Ao contr\u00e1rio dos gases ou l\u00edquidos, os materiais s\u00f3lidos tendem a manter sua forma quando sofrem expans\u00e3o t\u00e9rmica.\u00a0Um <\/span><strong><span>coeficiente de expans\u00e3o linear<\/span><\/strong><span> \u00e9 geralmente empregado para descrever a expans\u00e3o de um s\u00f3lido, enquanto um coeficiente de expans\u00e3o de volume \u00e9 mais \u00fatil para um l\u00edquido ou g\u00e1s.<\/span><\/p>\n<p><span>O <\/span><strong><span>coeficiente de expans\u00e3o t\u00e9rmica linear<\/span><\/strong><span> \u00e9 definido como:<\/span><\/p>\n<p><a href=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/linear-thermal-expansion-coefficient-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-28144\" src=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/linear-thermal-expansion-coefficient-equation.png\" alt=\"coeficiente de expans\u00e3o t\u00e9rmica linear - equa\u00e7\u00e3o\" width=\"124\" height=\"73\" \/><\/a><\/p>\n<p><span>onde <\/span><em><span>L<\/span><\/em><span> \u00e9 uma medida de comprimento particular e <\/span><em><span>dL\/dT<\/span><\/em><span> \u00e9 a taxa de mudan\u00e7a dessa dimens\u00e3o linear por unidade de mudan\u00e7a de temperatura.<\/span><\/p>\n<p><span>\u00a0<\/span><\/p>\n<p><span><\/span><\/p><\/div><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span><div class=\"su-accordion su-u-trim\"><div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>Refer\u00eancias:<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">Ci\u00eancia dos Materiais:<\/div><\/div><\/div><\/span><\/p>\n<p><span>Departamento de Energia dos EUA, Ci\u00eancia de Materiais.\u00a0DOE Fundamentals Handbook, Volume 1 e 2. Janeiro de 1993.<\/span><br \/>\n<span>Departamento de Energia dos EUA, Ci\u00eancia de Materiais.\u00a0DOE Fundamentals Handbook, Volume 2 e 2. Janeiro de 1993.<\/span><br \/>\n<span>William D. Callister, David G. Rethwisch.\u00a0Ci\u00eancia e Engenharia de Materiais: Uma Introdu\u00e7\u00e3o 9\u00aa Edi\u00e7\u00e3o, Wiley;\u00a09 edi\u00e7\u00e3o (4 de dezembro de 2013), ISBN-13: 978-1118324578.<\/span><br \/>\n<span>Eberhart, Mark (2003).\u00a0Por que as coisas quebram: entendendo o mundo pela maneira como ele se desfaz.\u00a0Harmonia.\u00a0ISBN 978-1-4000-4760-4.<\/span><br \/>\n<span>Gaskell, David R. (1995).\u00a0Introdu\u00e7\u00e3o \u00e0 Termodin\u00e2mica dos Materiais (4\u00aa ed.).\u00a0Editora Taylor e Francis.\u00a0ISBN 978-1-56032-992-3.<\/span><br \/>\n<span>Gonz\u00e1lez-Vi\u00f1as, W. &amp; Mancini, HL (2004).\u00a0Uma Introdu\u00e7\u00e3o \u00e0 Ci\u00eancia dos Materiais.\u00a0Princeton University Press.\u00a0ISBN 978-0-691-07097-1.<\/span><br \/>\n<span>Ashby, Michael;\u00a0Hugh Shercliff;\u00a0David Cebon (2007).\u00a0Materiais: engenharia, ci\u00eancia, processamento e design (1\u00aa ed.).\u00a0Butterworth-Heinemann.\u00a0ISBN 978-0-7506-8391-3.<\/span><br \/>\n<span>JR Lamarsh, AJ Baratta, Introdu\u00e7\u00e3o \u00e0 Engenharia Nuclear, 3\u00aa ed., Prentice-Hall, 2001, ISBN: 0-201-82498-1.<\/span><br \/>\n<span><\/span><\/p><\/div><\/div><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><div class=\"su-divider su-divider-style-default\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span>Veja acima:<\/span><br \/>\n<span>Ligas de n\u00edquel<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/alloys-composition-properties-of-metal-alloys\/nickel-alloys\/ \" class=\"su-button su-button-style-flat\" style=\"color:#606060;background-color:#ffffff;border-color:#cccccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px\" target=\"_self\"><span style=\"color:#606060;padding:7px 20px;font-size:16px;line-height:24px;border-color:#ffffff;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;text-shadow:0px 0px 0px #000000;-moz-text-shadow:0px 0px 0px #000000;-webkit-text-shadow:0px 0px 0px #000000\"><i class=\"sui sui-link\" style=\"font-size:16px;color:#5d5d5d\"><\/i> <\/span><\/a><\/span><\/p><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span>Esperamos que este artigo,\u00a0<\/span><strong><span>Invar &#8211; Propriedades e usos<\/span><\/strong><span>, ajude voc\u00ea.\u00a0Se sim,\u00a0<\/span><strong><span>d\u00ea um like<\/span><\/strong><span>\u00a0na barra lateral.\u00a0O objetivo principal deste site \u00e9 ajudar o p\u00fablico a aprender algumas informa\u00e7\u00f5es interessantes e importantes sobre materiais e suas propriedades.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Esperamos que este artigo,\u00a0Invar &#8211; Propriedades e usos, ajude voc\u00ea.\u00a0Se sim,\u00a0d\u00ea um like\u00a0na barra lateral.\u00a0O objetivo principal deste site \u00e9 ajudar o p\u00fablico a aprender algumas informa\u00e7\u00f5es interessantes e importantes sobre materiais e suas propriedades. &nbsp;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 Invar - Propriedades e Usos - Defini\u00e7\u00e3o | Propriedades do material<\/title>\n<meta name=\"description\" content=\"Invar \u00e9 um grupo de ligas de n\u00edquel-ferro de baixa expans\u00e3o t\u00e9rmica, consistindo principalmente de n\u00edquel e ferro (por exemplo, FeNi36). O nome Invar vem da palavra invari\u00e1vel, referindo-se \u00e0 sua relativa falta de expans\u00e3o ou contra\u00e7\u00e3o com mudan\u00e7as de temperatura.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/material-properties.org\/pt-br\/o-que-e-invar-propriedades-e-usos-definicao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que \u00e9 Invar - Propriedades e Usos - Defini\u00e7\u00e3o | Propriedades do material\" \/>\n<meta property=\"og:description\" content=\"Invar \u00e9 um grupo de ligas de n\u00edquel-ferro de baixa expans\u00e3o t\u00e9rmica, consistindo principalmente de n\u00edquel e ferro (por exemplo, FeNi36). O nome Invar vem da palavra invari\u00e1vel, referindo-se \u00e0 sua relativa falta de expans\u00e3o ou contra\u00e7\u00e3o com mudan\u00e7as de temperatura.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/material-properties.org\/pt-br\/o-que-e-invar-propriedades-e-usos-definicao\/\" \/>\n<meta property=\"og:site_name\" content=\"Material Properties\" \/>\n<meta property=\"article:published_time\" content=\"2023-02-08T01:38:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-15T07:31:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.nuclear-power.com\/wp-content\/uploads\/2019\/12\/linear-thermal-expansion-coefficient-equation.png\" \/>\n<meta name=\"author\" content=\"Nick Connor\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nick Connor\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/material-properties.org\/pt-br\/o-que-e-invar-propriedades-e-usos-definicao\/\",\"url\":\"https:\/\/material-properties.org\/pt-br\/o-que-e-invar-propriedades-e-usos-definicao\/\",\"name\":\"O que \u00e9 Invar - Propriedades e Usos - Defini\u00e7\u00e3o | Propriedades do material\",\"isPartOf\":{\"@id\":\"https:\/\/material-properties.org\/pt-br\/#website\"},\"datePublished\":\"2023-02-08T01:38:58+00:00\",\"dateModified\":\"2023-02-15T07:31:28+00:00\",\"author\":{\"@id\":\"https:\/\/material-properties.org\/pt-br\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\"},\"description\":\"Invar \u00e9 um grupo de ligas de n\u00edquel-ferro de baixa expans\u00e3o t\u00e9rmica, consistindo principalmente de n\u00edquel e ferro (por exemplo, FeNi36). 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