{"id":12141,"date":"2001-10-07T00:00:00","date_gmt":"2001-10-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/nanocomposites-de-alumina\/"},"modified":"2001-10-07T00:00:00","modified_gmt":"2001-10-07T00:00:00","slug":"nanocomposites-de-alumina","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ingenieria-y-tecnologia-quimicas\/nanocomposites-de-alumina\/","title":{"rendered":"Nanocomposites de al\u00famina"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Mart\u00edn Schehl <\/strong><\/h2>\n<p>En esta tesis se ha llevado a cabo un nuevo procesamiento para modificar el borde de grano de la al\u00famina. Este nuevo procesamiento se basa en la modificaci\u00f3n de un procesamiento que se hab\u00eda desarrollado hace unos 10 a\u00f1os. Consiste en la preparaci\u00f3n de una dispersi\u00f3n de un polvo de al\u00famina en etanol absoluto y la siguiente adici\u00f3n de diferentes alc\u00f3xidos en diversos porcentajes como pueden ser zirconium iv-propoxide, tetraethyl-orthosilicate (teos) o yttrium methoxyethoxide o mezclas de ellos. Despu\u00e9s del secado bajo agitaci\u00f3n, se efectu\u00f3 directamente un tratamiento t\u00e9rmico a 850\u00c2\u00bac\/2h sin pasar por la etapa de la hidr\u00f3lisis, normalmente utilizado por otros investigadores. A continuaci\u00f3n estas mezclas se molieron en un molino de atrici\u00f3n, se tamizaron (45 um) se prensaron isot\u00e1ticamente (200 mpa) y se sinterizaron con el siguiente tratamiento t\u00e9rmico; 1600\u00c2\u00bac\/2h. Se fabricaron los siguientes materiales:  a,- al\u00famina condea  hpa-0,5  b,- al\u00famina con los siguientes porcentajes de circonia: 5 wt% y 15 wt%.  nombre de estos materiales: a5z, a10z, a15z y a20z.  c,- al\u00famina con el siguiente porcentaje de yttria: 2,8 wt%.  nombre de este material: ay  d,- al\u00famina con el siguiente porcentaje de circoni ay silice: 2,7 wt%.  nombre de este material: azs  de todos los materiales se examin\u00f3 el comportamiento durante la sinterizaci\u00f3n, la evoluci\u00f3n de las fases cristalinas y despu\u00e9s se realiz\u00f3 una caracterizaci\u00f3n de las propiedades mec\u00e1nicas a temperatura ambiente (dureza vickers, m\u00f3dulo de young, resistencia a la flexi\u00f3n y tenacidad a la fractura). Las propiedades mec\u00e1nicas a alta temperatura de los materiales del grupo b y c se examinaron con ensayos de fluencia en flexi\u00f3n en 4 puntos.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Nanocomposites de al\u00famina<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Nanocomposites de al\u00famina <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Mart\u00edn Schehl <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 10\/07\/2001<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Ram\u00f3n Torrecillas San Mill\u00e1n<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: vicente Fernandez herrero <\/li>\n<li>gilbert Fantozzi (vocal)<\/li>\n<li>Jos\u00e9 serafin Moya corral (vocal)<\/li>\n<li>Manuel Jimenez melendo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Mart\u00edn Schehl En esta tesis se ha llevado a cabo un nuevo procesamiento para modificar el borde [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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