{"id":6746,"date":"2024-11-23T10:34:03","date_gmt":"2024-11-23T10:34:03","guid":{"rendered":"https:\/\/jinsuncarbon.com\/?p=6746"},"modified":"2024-12-29T00:21:17","modified_gmt":"2024-12-29T00:21:17","slug":"resistividade-eletrica-do-grafite","status":"publish","type":"post","link":"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/","title":{"rendered":"Entendendo a resistividade el\u00e9trica do grafite"},"content":{"rendered":"<p>A resistividade el\u00e9trica do grafite \u00e9 um valor de uma quantidade f\u00edsica que indica sua condutividade. Esse m\u00e9todo \u00e9 a t\u00e9cnica para avaliar a condutividade em diferentes materiais de grafite de forma eficaz. A resistividade el\u00e9trica do grafite refere-se ao tamanho da resist\u00eancia por unidade de comprimento e \u00e9 geralmente expressa em ohm-metro, abreviado como \u03a9-m.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabela de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Graphite_Electrical_Resistivity_Measurement\" >Medi\u00e7\u00e3o da resistividade el\u00e9trica do grafite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Temperature_dependence_analysis\" >An\u00e1lise de depend\u00eancia de temperatura<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#The_following_table_shows_the_resistance_of_different_graphite_materials\" >A tabela a seguir mostra a resist\u00eancia de diferentes materiais de grafite<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Factors_affecting_graphite_electrical_resistivity\" >Fatores que afetam a resistividade el\u00e9trica do grafite<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Material_purity\" >Pureza do material<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Grain_size_and_orientation\" >Tamanho e orienta\u00e7\u00e3o dos gr\u00e3os<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Structural_defects\" >Defeitos estruturais<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Comparison_of_the_electrical_conductivity_of_graphite_and_copper\" >Compara\u00e7\u00e3o da condutividade el\u00e9trica do grafite e do cobre<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jinsuncarbon.com\/pt\/resistividade-eletrica-do-grafite\/#Conclusion\" >Conclus\u00e3o<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"Graphite_Electrical_Resistivity_Measurement\"><\/span>Medi\u00e7\u00e3o da resistividade el\u00e9trica do grafite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>M\u00e9todo de quatro sondas<\/strong><\/p>\n<p>O m\u00e9todo de quatro sondas \u00e9 o mais comumente usado no laborat\u00f3rio, com m\u00e9todo de medi\u00e7\u00e3o de alta precis\u00e3o. Quatro sondas pressionam a corrente na amostra para calcular a resistividade medindo a diferen\u00e7a de tens\u00e3o. A vantagem do m\u00e9todo de quatro sondas \u00e9 que ele evita a influ\u00eancia da resist\u00eancia de contato, a precis\u00e3o da medi\u00e7\u00e3o \u00e9 muito alta e pode ser aplicado \u00e0s amostras na forma de filme fino e em massa.<\/p>\n<p><strong><b>M\u00e9todo de duas sondas<\/b><\/strong><\/p>\n<p>O m\u00e9todo de duas sondas aplica diretamente a corrente a ambas as extremidades da amostra e mede a tens\u00e3o. Calcule a resist\u00eancia total. A vantagem do m\u00e9todo de duas sondas \u00e9 que ele \u00e9 simples e f\u00e1cil de operar. Al\u00e9m disso, o m\u00e9todo de duas sondas tamb\u00e9m se adapta a cenas de medi\u00e7\u00e3o r\u00e1pidas e de baixa demanda.<\/p>\n<p><strong><b>M\u00e9todo de fio quente<\/b><\/strong><\/p>\n<p>O m\u00e9todo de fio quente usa a corrente para aquecer o fio quente ou a bobina dentro da amostra a fim de medir as caracter\u00edsticas da resist\u00eancia que mudam com a temperatura. Esse m\u00e9todo tamb\u00e9m estuda a condutividade sob uma condi\u00e7\u00e3o de alta temperatura de diferentes materiais.<\/p>\n<p><strong><b>M\u00e9todo de quatro sondas em alta temperatura<\/b><\/strong><\/p>\n<p>A resistividade sob as condi\u00e7\u00f5es de um ambiente de alta temperatura pode ser testada por esse m\u00e9todo. O m\u00e9todo de quatro sondas de alta temperatura combina o forno de alta temperatura com um dispositivo de quatro sondas para avalia\u00e7\u00e3o do desempenho em alta temperatura.<\/p>\n<p><strong><b>M\u00e9todo de resist\u00eancia de contato<\/b><\/strong><\/p>\n<p>O m\u00e9todo de resist\u00eancia de contato \u00e9 usado principalmente para estudos de laborat\u00f3rio. Uma das medi\u00e7\u00f5es precisas usadas para testar a resist\u00eancia de uma amostra \u00e9 o circuito de medi\u00e7\u00e3o balanceado da ponte de Wheatstone.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Temperature_dependence_analysis\"><\/span>An\u00e1lise de depend\u00eancia de temperatura<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A an\u00e1lise da depend\u00eancia da temperatura pode estudar a regra de altera\u00e7\u00e3o da resist\u00eancia com a temperatura no material de grafite, obter a propriedade condutora est\u00e1vel e relacionada do grafite e oferecer suporte de dados para a aplica\u00e7\u00e3o de materiais em altas temperaturas.<\/p>\n<p>&nbsp;<\/p>\n<h5><span class=\"ez-toc-section\" id=\"The_following_table_shows_the_resistance_of_different_graphite_materials\"><\/span>A tabela a seguir mostra a resist\u00eancia de diferentes materiais de grafite<span class=\"ez-toc-section-end\"><\/span><\/h5>\n<table>\n<tbody>\n<tr>\n<td width=\"213\">Tipo de material de grafite<\/td>\n<td width=\"213\">Resistividade (1000\u00b0C) \/ \u03a9-m<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Grafite de alta densidade<\/td>\n<td width=\"213\">\uff086.4\u00b10.9\uff09\u00d710<sup>-6\u00a0<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Estrutura de part\u00edculas grossas Grafite<\/td>\n<td width=\"213\">\uff089.2\u00b11.4\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Grafite de granula\u00e7\u00e3o fina<\/td>\n<td width=\"213\">\uff0812.9\u00b12.6\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Eletrodo de grafite<\/td>\n<td width=\"213\">\uff087.5\u00b10.7\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Grafite poroso<\/td>\n<td width=\"213\">\uff0812.0\u00b11.2\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><\/h2>\n<h2><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Factors_affecting_graphite_electrical_resistivity\"><\/span>Fatores que afetam a resistividade el\u00e9trica do grafite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Material_purity\"><\/span>Pureza do material<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Quanto menos impurezas um material contiver, menor ser\u00e1 sua resistividade<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Grain_size_and_orientation\"><\/span>Tamanho e orienta\u00e7\u00e3o dos gr\u00e3os<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>Tamanho do gr\u00e3o<\/b><\/strong><\/p>\n<p>A resist\u00eancia el\u00e9trica do grafite depende significativamente do tamanho e da orienta\u00e7\u00e3o dos gr\u00e3os. Gr\u00e3os maiores reduzem o efeito de dispers\u00e3o dos limites dos gr\u00e3os e permitem maior continuidade do caminho condutor, reduzindo a resist\u00eancia; por outro lado, gr\u00e3os menores t\u00eam limites de gr\u00e3os maiores, resultando em dispers\u00e3o de el\u00e9trons mais frequente e, portanto, aumentando a resist\u00eancia.<\/p>\n<p><strong><b>Orienta\u00e7\u00e3o<\/b><\/strong><\/p>\n<p>O grafite \u00e9 um <a href=\"https:\/\/en.wikipedia.org\/wiki\/Anisotropy\" target=\"_blank\" rel=\"noopener\">anisotr\u00f3pico<\/a> com baixa resist\u00eancia ao fluxo de el\u00e9trons ao longo do plano da camada (plano a-b) e com baixa resist\u00eancia. Em contrapartida, sua resist\u00eancia aumenta significativamente devido \u00e0 for\u00e7a de van der Waals que atua perpendicularmente ao plano da camada (eixo c). Portanto, quanto maior o gr\u00e3o e quanto mais pr\u00f3xima a orienta\u00e7\u00e3o do gr\u00e3o estiver da dire\u00e7\u00e3o do fluxo de corrente, menor ser\u00e1 a resist\u00eancia do grafite.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Structural_defects\"><\/span>Defeitos estruturais<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong><b>Defeitos na rede<\/b><\/strong><\/p>\n<p>Defeitos pontuais no grafite, como vac\u00e2ncias e \u00e1tomos de impureza, destruir\u00e3o o sistema completo de liga\u00e7\u00e3o \u03c0 dos \u00e1tomos de carbono, bloquear\u00e3o a livre circula\u00e7\u00e3o de el\u00e9trons em uma camada e, portanto, aumentar\u00e3o a resistividade.<\/p>\n<p><strong><b>Defeitos nos limites dos gr\u00e3os<\/b><\/strong><\/p>\n<p>A presen\u00e7a de limites de gr\u00e3os aumenta a dispers\u00e3o de el\u00e9trons, dificultando o fluxo de el\u00e9trons atrav\u00e9s dos gr\u00e3os e levando a uma maior resistividade. Al\u00e9m disso, quanto maior o n\u00famero de limites de gr\u00e3o ou quanto menor o tamanho do gr\u00e3o, mais pronunciado se torna esse efeito.<\/p>\n<p><strong><b>Defeitos entre camadas<\/b><\/strong><\/p>\n<p>Esse deslocamento, ruga ou lacuna entre as camadas reduziria a condutividade entre o grafite <a href=\"https:\/\/en.wikipedia.org\/wiki\/Graphite\" target=\"_blank\" rel=\"noopener\">camadas<\/a>fazendo com que os el\u00e9trons fluam com mais dificuldade ao longo da dire\u00e7\u00e3o do eixo c, aumentando consideravelmente sua resistividade verticalmente.<\/p>\n<p><strong><b>Porosidade e rachaduras<\/b><\/strong><\/p>\n<p>Os poros e as rachaduras no produto diminuem a \u00e1rea condutora efetiva do grafite e aumentam o caminho da corrente, o que leva a uma maior resistividade.<\/p>\n<p><strong><b>Efeitos da temperatura<\/b><\/strong><\/p>\n<p>Pode-se observar que, \u00e0 medida que a calcina\u00e7\u00e3o ou<a href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafitizacao\/\"> grafitiza\u00e7\u00e3o<\/a> Quando a temperatura aumenta, a resistividade espec\u00edfica do produto diminui gradualmente. No entanto, os motivos da diminui\u00e7\u00e3o s\u00e3o diferentes. Durante o est\u00e1gio de torrefa\u00e7\u00e3o, a queda da resistividade espec\u00edfica \u00e9 causada principalmente pela libera\u00e7\u00e3o de vol\u00e1teis, coqueifica\u00e7\u00e3o de aglutinantes e encolhimento cont\u00ednuo do produto. Durante o est\u00e1gio de grafitiza\u00e7\u00e3o, a queda na resistividade espec\u00edfica foi causada pela transforma\u00e7\u00e3o do carbono amorfo em <a href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-e-de-que-e-feito-o-grafite\/\">grafite<\/a> estrutura cristalina.<\/p>\n<p><strong><b>Press\u00e3o externa<\/b><\/strong><\/p>\n<p>A press\u00e3o externa aumenta a densifica\u00e7\u00e3o do material ao comprimir os poros da estrutura do grafite. A press\u00e3o tamb\u00e9m influencia o arranjo das camadas de cristal de grafite e diminui a resistividade na dire\u00e7\u00e3o do eixo c. Em geral, a press\u00e3o externa se reflete na redu\u00e7\u00e3o da porosidade, na melhoria da conex\u00e3o dos gr\u00e3os e no aprimoramento da disposi\u00e7\u00e3o entre as camadas.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Comparison_of_the_electrical_conductivity_of_graphite_and_copper\"><\/span>Compara\u00e7\u00e3o da condutividade el\u00e9trica do grafite e do cobre<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Em aplica\u00e7\u00f5es de temperatura normal, o cobre tem condutividade mais alta do que o grafite; entretanto, em aplica\u00e7\u00f5es de alta temperatura, o grafite ainda mant\u00e9m uma condutividade mais alta do que o cobre.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclus\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A resistividade teve um grande efeito na propriedade el\u00e9trica do grafite. A resistividade el\u00e9trica \u00e9 um dos fatores cr\u00edticos que determinam a propriedade el\u00e9trica do grafite. Quanto menor for a condutividade do grafite, melhor ser\u00e1 sua condutividade e menor ser\u00e1 o consumo de energia.<\/p>","protected":false},"excerpt":{"rendered":"<p>Graphite electrical resistivity is an amount of a physical quantity, indicating its conductivity. This method is the technique for assessing conductivity in different graphite materials effectively. The graphite electric resistivity pertains to the size of the resistance per unit length and is generally expressed in ohm-meter, short as \u03a9\u00b7m. Graphite Electrical Resistivity Measurement Four-probe method [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6755,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[],"class_list":["post-6746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.2.1 (Yoast SEO v25.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Understanding Graphite Electrical Resistivity<\/title>\n<meta name=\"description\" content=\"Graphite electrical resistivity pertains to the size of the resistance per unit length and is generally expressed in ohm-meters, short as \u03a9\u00b7m\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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