{"id":70278,"date":"2018-03-09T23:14:48","date_gmt":"2018-03-09T23:14:48","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/fabricacion-de-herramientas-de-metal-duro-a-partir-de-polvos-de-tamano-nanometrico-y-ultrafino\/"},"modified":"2018-03-09T23:14:48","modified_gmt":"2018-03-09T23:14:48","slug":"fabricacion-de-herramientas-de-metal-duro-a-partir-de-polvos-de-tamano-nanometrico-y-ultrafino","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/navarra\/fabricacion-de-herramientas-de-metal-duro-a-partir-de-polvos-de-tamano-nanometrico-y-ultrafino\/","title":{"rendered":"Fabricaci\u00f3n de herramientas de metal duro a partir de polvos de tama\u00f1o nanom\u00e9trico y ultrafino"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Alejandro Ordo\u00f1ez Torres <\/strong><\/h2>\n<p>En la presente tesis se ha estudiado la fabricaci\u00f3n de \u00abcermets\u00bb de carburo de wolframio y cobalto (wc-co) a partir de polvos de wc con tama\u00f1os promedio entre 30 y 600 nm.  el procesamiento previo a la sinterizaci\u00f3n de las mezclas de polvos de wc-co es fundamental para conseguir una microestructura homog\u00e9nea libre de porosidad. La ruta convencional produce poros de gran tama\u00f1o tras sinterizar. estos defectos son d\u00e9bidos a la presencia de aglomerados del ligante org\u00e1nico y a su distribuci\u00f3n heterog\u00e9nea. El aumento de la energ\u00eda de molienda (uso del molino planetario) y el secado bajo presi\u00f3n permite eliminar este tipo de defectos asegurando una mezcla m\u00e1s homog\u00e9nea.  el proceso de presinterizado (necesario para la fabricaci\u00f3n de piezas con geometr\u00eda complicada) tambi\u00e9n requiere cambios sustanciales cuando se aplica a mezclas de polvos de wc ultrafinos.  durante la etapa de sinterizaci\u00f3n, la cin\u00e9tica de densificaci\u00f3n de las mezclas wc-co obtenidas a partir de polvos ultrafinos se caracteriza por bruscas aceleraciones y deceleraciones a temperaturas por debajo del \u00abliquidus\u00bb. este at\u00edpico comportamiento es m\u00e1s notorio en presencia de inhibidores y cuanto menor es el tama\u00f1o de part\u00edcula de wc, y podr\u00eda deberse a la combinaci\u00f3n de fen\u00f3menos de contracci\u00f3n local (m\u00e1s r\u00e1pidos cuanto menor es el tama\u00f1o de part\u00edcula de wc) seguidos de reordenamiento de aglomerados para rellenar la porosidad circundante.  la eliminaci\u00f3n completa de la porosidad ha requerido el desarrollo de dos v\u00edas alternativas de consolidaci\u00f3n basadas en la aplicaci\u00f3n de presi\u00f3n isost\u00e1tica en caliente (hip); hip encapsulado en vidrio (gehip) y hip tras sinterizaci\u00f3n en vac\u00edo (sinter + hip).  la reducci\u00f3n del tama\u00f1o de part\u00edcula del polvo de wc de 0.4 a 0.2 micras supone un aumento sustancial de la dureza tras sinter+hip entre 0.8 y 1 gpa.  las pruebas de fresado realizadas sobre acero han permitido comparar el comportamiento de los<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Fabricaci\u00f3n de herramientas de metal duro a partir de polvos de tama\u00f1o nanom\u00e9trico y ultrafino<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Fabricaci\u00f3n de herramientas de metal duro a partir de polvos de tama\u00f1o nanom\u00e9trico y ultrafino <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Alejandro Ordo\u00f1ez Torres <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Navarra<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 23\/09\/2004<\/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>Jos\u00e9 Manuel S\u00e1nchez Moreno<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: javier Gil sevillano <\/li>\n<li> Barandika argoitia miren gotzone (vocal)<\/li>\n<li>marcos Juan Anglada gomila (vocal)<\/li>\n<li>ibon Azkona villaverde (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Alejandro Ordo\u00f1ez Torres En la presente tesis se ha estudiado la fabricaci\u00f3n de \u00abcermets\u00bb de carburo de [&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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