{"id":3027,"date":"2021-01-21T09:22:21","date_gmt":"2021-01-21T08:22:21","guid":{"rendered":"https:\/\/www.redhillballs.com\/?page_id=3027"},"modified":"2025-09-29T10:58:05","modified_gmt":"2025-09-29T08:58:05","slug":"esferas-de-rubi","status":"publish","type":"page","link":"https:\/\/www.redhillballs.com\/pt-pt\/produtos\/esferas-de-safira-e-rubi\/esferas-de-rubi\/","title":{"rendered":"Esferas de rubi"},"content":{"rendered":"<h2>\ud83d\udee0\ufe0f <a href=\"https:\/\/en.wikipedia.org\/wiki\/Corundum\">Esferas de rubi \u2013 Componentes de precis\u00e3o de alto desempenho<\/a><\/h2>\n<p>As esferas de rubi s\u00e3o esferas de precis\u00e3o fabricadas em rubi sint\u00e9tico (Al\u2082O\u2083:Cr), uma forma cristalina de cor\u00edndon dopada com cr\u00f3mio. Conhecidas pela dureza excecional \u2014 segunda apenas ao diamante \u2014 e not\u00e1vel resist\u00eancia ao desgaste, s\u00e3o indispens\u00e1veis em aplica\u00e7\u00f5es que exigem durabilidade, estabilidade dimensional e resist\u00eancia a condi\u00e7\u00f5es extremas. As suas propriedades \u00fanicas tornam-nas ideais para aeroespacial, instrumenta\u00e7\u00e3o biom\u00e9dica e engenharia de alto v\u00e1cuo.<\/p>\n<h3>\ud83d\udd27 Principais especifica\u00e7\u00f5es t\u00e9cnicas<\/h3>\n<ul>\n<li><strong>Estrutura cristalina<\/strong>: Monocristal hexagonal rombo\u00e9drico<\/li>\n<li><strong>Composi\u00e7\u00e3o<\/strong>: Al\u2082O\u2083:Cr (rubi sint\u00e9tico)<\/li>\n<li><strong>Pureza<\/strong>: 99,99%<\/li>\n<li><strong>Densidade<\/strong>: ~3,99 g\/cm\u00b3<\/li>\n<li><strong>Dureza Mohs<\/strong>: 9<\/li>\n<li><strong>Dureza Knoop<\/strong>: ~2200 (eixo C), ~1800 (perpendicular ao eixo C)<\/li>\n<li><strong>M\u00f3dulo de Young<\/strong>: ~440 GPa<\/li>\n<li><strong>Ponto de fus\u00e3o<\/strong>: ~2050 \u00b0C<\/li>\n<li><strong>Condutividade t\u00e9rmica<\/strong>: ~40 W\/m\u00b7K a 300 K<\/li>\n<li><strong>Expans\u00e3o t\u00e9rmica<\/strong>: 6,2 \u00d7 10\u207b\u2076 \/\u00b0C (paralela ao eixo C), 5,4 \u00d7 10\u207b\u2076 \/\u00b0C (perpendicular)<\/li>\n<li><strong>Resistividade el\u00e9trica<\/strong>: &gt;10\u00b9\u00b2 \u03a9\u00b7cm (isolante)<\/li>\n<li><strong>Constante diel\u00e9trica<\/strong>: 10,6 (paralela ao eixo C), 8,6 (perpendicular)<\/li>\n<\/ul>\n<h3>\u2705 Vantagens<\/h3>\n<ul>\n<li><strong>Dureza e resist\u00eancia ao desgaste excecionais<\/strong>: Longevidade em ambientes de alto atrito.<\/li>\n<li><strong>Elevada estabilidade t\u00e9rmica<\/strong>: Opera\u00e7\u00e3o eficaz at\u00e9 ~2050 \u00b0C.<\/li>\n<li><strong>In\u00e9rcia qu\u00edmica das Esferas de Rubi<\/strong>: Resistentes \u00e0 maioria dos \u00e1cidos e \u00e1lcalis.<\/li>\n<li><strong>Estabilidade dimensional<\/strong>: Mant\u00eam a forma sob esfor\u00e7os mec\u00e2nicos e t\u00e9rmicos.<\/li>\n<li><strong>Isolamento el\u00e9trico<\/strong>: Ideais quando \u00e9 necess\u00e1rio material n\u00e3o condutor.<\/li>\n<li><strong>Clareza \u00f3tica<\/strong>: \u00dateis quando a transpar\u00eancia \u00e9 essencial.<\/li>\n<\/ul>\n<h3>\ud83d\udd04 Aplica\u00e7\u00f5es das Esferas de Rubi<\/h3>\n<p>As esferas de rubi s\u00e3o utilizadas em v\u00e1rias aplica\u00e7\u00f5es de alta precis\u00e3o, incluindo:<\/p>\n<ul>\n<li><strong>Rolamentos de precis\u00e3o<\/strong>: Rel\u00f3gios mec\u00e2nicos, girosc\u00f3pios e outros instrumentos de baixo atrito.<\/li>\n<li><strong>Sistemas \u00f3ticos<\/strong>: Conectores de fibra \u00f3tica, sistemas laser e dispositivos de alinhamento \u00f3tico.<\/li>\n<li><strong>Instrumentos de medi\u00e7\u00e3o<\/strong>: Medidores de caudal, leitores de c\u00f3digos de barras e outros equipamentos de metrologia.<\/li>\n<li><strong>Dispositivos aeroespaciais e biom\u00e9dicos<\/strong>: Ambientes que exigem alta fiabilidade e desempenho.<\/li>\n<\/ul>\n<h3>\ud83d\udce6 Graus e tamanhos dispon\u00edveis<\/h3>\n<p>As esferas de rubi est\u00e3o dispon\u00edveis em diversos graus e tamanhos para requisitos espec\u00edficos:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.redhillballs.com\/company\/precision-grades\/\"><strong>Graus<\/strong>: G1, G2, G3, G5, G10 at\u00e9 G25<\/a><\/li>\n<li><strong>Tamanhos<\/strong>: Di\u00e2metros de 0,16 mm a 10 mm; tamanhos personalizados mediante pedido.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udee0\ufe0f Esferas de rubi \u2013 Componentes de precis\u00e3o de alto desempenho As esferas de rubi s\u00e3o esferas de precis\u00e3o fabricadas em rubi sint\u00e9tico (Al\u2082O\u2083:Cr), uma forma cristalina de cor\u00edndon dopada com cr\u00f3mio. Conhecidas pela dureza excecional \u2014 segunda apenas ao diamante \u2014 e not\u00e1vel resist\u00eancia ao desgaste, s\u00e3o indispens\u00e1veis em aplica\u00e7\u00f5es que exigem durabilidade, estabilidade [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9232,"parent":3025,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3027","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Esferas de rubi \u2013 dureza e estabilidade dimensional<\/title>\n<meta name=\"description\" content=\"Esferas de rubi destacam-se pela extrema dureza, resist\u00eancia ao desgaste e precis\u00e3o em aplica\u00e7\u00f5es \u00f3pticas, de medi\u00e7\u00e3o e industriais.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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