{"id":3029,"date":"2021-01-21T09:22:36","date_gmt":"2021-01-21T08:22:36","guid":{"rendered":"https:\/\/www.redhillballs.com\/?page_id=3029"},"modified":"2025-09-29T10:58:43","modified_gmt":"2025-09-29T08:58:43","slug":"esferas-de-safira","status":"publish","type":"page","link":"https:\/\/www.redhillballs.com\/pt-pt\/produtos\/esferas-de-safira-e-rubi\/esferas-de-safira\/","title":{"rendered":"Esferas de safira"},"content":{"rendered":"<h2>\ud83d\udee0\ufe0f <a href=\"https:\/\/en.wikipedia.org\/wiki\/Corundum\">Esferas de safira \u2013 Componentes de precis\u00e3o de alto desempenho<\/a><\/h2>\n<p>As esferas de safira s\u00e3o esferas de precis\u00e3o feitas de safira sint\u00e9tica (Al\u2082O\u2083), uma forma cristalina de cor\u00edndon. Conhecidas por sua dureza excepcional \u2014 segunda apenas ao diamante \u2014 oferecem excelente resist\u00eancia ao desgaste, estabilidade dimensional e resili\u00eancia t\u00e9rmica. Suas propriedades \u00fanicas as tornam indispens\u00e1veis em aplica\u00e7\u00f5es que exigem durabilidade e precis\u00e3o, como aeroespacial, instrumenta\u00e7\u00e3o biom\u00e9dica e ambientes de alto v\u00e1cuo.<\/p>\n<h3>\ud83d\udd27 Principais especifica\u00e7\u00f5es t\u00e9cnicas<\/h3>\n<ul>\n<li><strong>Estrutura cristalina<\/strong>: Monocristalina hexagonal rombo\u00e9drica<\/li>\n<li><strong>Composi\u00e7\u00e3o<\/strong>: Al\u2082O\u2083 (safira sint\u00e9tica)<\/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>Coeficiente de expans\u00e3o t\u00e9rmica<\/strong>: 6,2 \u00d7 10\u207b\u2076 \/\u00b0C (paralelo 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 (paralelo), 8,6 (perpendicular ao eixo C)<\/li>\n<\/ul>\n<h3>\u2705 Vantagens<\/h3>\n<ul>\n<li><strong>Dureza e resist\u00eancia ao desgaste excepcionais<\/strong>: Longa vida \u00fatil em ambientes de alto atrito.<\/li>\n<li><strong>Alta estabilidade t\u00e9rmica<\/strong>: Opera eficazmente em temperaturas at\u00e9 ~2050 \u00b0C.<\/li>\n<li><strong>In\u00e9rcia qu\u00edmica<\/strong>: Resistentes \u00e0 maioria dos \u00e1cidos e \u00e1lcalis.<\/li>\n<li><strong>Estabilidade dimensional<\/strong>: Mant\u00eam a forma sob tens\u00f5es mec\u00e2nicas e t\u00e9rmicas.<\/li>\n<li><strong>Isolamento el\u00e9trico<\/strong>: Ideais para aplica\u00e7\u00f5es que exigem material n\u00e3o condutor.<\/li>\n<li><strong>Transpar\u00eancia \u00f3ptica<\/strong>: \u00dateis quando a transpar\u00eancia \u00e9 essencial.<\/li>\n<\/ul>\n<h3>\ud83d\udd04 Aplica\u00e7\u00f5es das esferas de safira<\/h3>\n<p>As esferas de safira para rolamentos 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 que exigem baixo atrito e alta durabilidade.<\/li>\n<li><strong>Sistemas \u00f3pticos<\/strong>: Conectores de fibra \u00f3ptica, sistemas a laser e dispositivos de alinhamento \u00f3ptico.<\/li>\n<li><strong>Instrumentos de medi\u00e7\u00e3o<\/strong>: Medidores de vaz\u00e3o, leitores de c\u00f3digo de barras e outros equipamentos de metrologia.<\/li>\n<li><strong>Dispositivos aeroespaciais e biom\u00e9dicos<\/strong>: Ambientes que requerem alta confiabilidade e desempenho.<\/li>\n<\/ul>\n<h3>\ud83d\udce6 Graus e tamanhos dispon\u00edveis<\/h3>\n<p>As esferas de safira para rolamentos est\u00e3o dispon\u00edveis em v\u00e1rios graus e tamanhos para atender a 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 25 mm; tamanhos personalizados sob consulta.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udee0\ufe0f Esferas de safira \u2013 Componentes de precis\u00e3o de alto desempenho As esferas de safira s\u00e3o esferas de precis\u00e3o feitas de safira sint\u00e9tica (Al\u2082O\u2083), uma forma cristalina de cor\u00edndon. Conhecidas por sua dureza excepcional \u2014 segunda apenas ao diamante \u2014 oferecem excelente resist\u00eancia ao desgaste, estabilidade dimensional e resili\u00eancia t\u00e9rmica. Suas propriedades \u00fanicas as tornam [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9245,"parent":3025,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3029","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 safira \u2013 dureza e transmiss\u00e3o \u00f3ptica<\/title>\n<meta name=\"description\" content=\"Esferas de safira oferecem extrema dureza, resist\u00eancia ao desgaste e alta transmiss\u00e3o \u00f3ptica em aplica\u00e7\u00f5es industriais e de precis\u00e3o\" \/>\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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