{"id":4715,"date":"2020-09-12T15:43:17","date_gmt":"2020-09-12T15:43:17","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4715"},"modified":"2020-09-11T15:52:30","modified_gmt":"2020-09-11T15:52:30","slug":"molten-metal-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/molten-metal-degassing\/","title":{"rendered":"Desgasificaci\u00f3n del metal fundido"},"content":{"rendered":"

La desgasificaci\u00f3n del metal fundido es una etapa importante en el proceso de fundici\u00f3n. Normalmente se utiliza el nitr\u00f3geno para la desgasificaci\u00f3n. Se denomina \u00abgas inerte\u00bb a aquel que no reacciona con el aluminio fundido ni con el hidr\u00f3geno disuelto, y que no se disuelve en el aluminio.<\/p>\n

La escoria puede eliminarse inyectando gas inerte en el ba\u00f1o fundido, ya que se forman numerosas burbujas finas tras la inyecci\u00f3n de gas inerte en el aluminio fundido. Cuando las burbujas atraviesan el metal fundido, entran en contacto con las inclusiones de \u00f3xido presentes en \u00e9l, y estas se adsorben en la superficie de las burbujas y flotan hasta la superficie del metal fundido junto con ellas. El \u00f3xido que ha sido llevado a la superficie del l\u00edquido no puede separarse autom\u00e1ticamente de la fase gaseosa ni volver a disolverse en el aluminio l\u00edquido. Se puede eliminar al acumularse en la superficie del aluminio l\u00edquido.<\/p>\n

Dado que la energ\u00eda libre superficial total del sistema disminuye una vez que la burbuja de gas inerte adsorbe las inclusiones de \u00f3xido presentes en la masa fundida, la adsorci\u00f3n puede producirse de forma autom\u00e1tica. Cuanto menor sea la tensi\u00f3n superficial entre el gas inerte y la inclusi\u00f3n, y cuanto mayor sea la tensi\u00f3n superficial entre la masa fundida y el gas inerte y entre la masa fundida y la inclusi\u00f3n, mayor ser\u00e1 la capacidad de este gas inerte para eliminar la escoria.<\/p>\n

\"Desgasificaci\u00f3n<\/p>\n

Cuando se utiliza gas inerte para el refinado de metal fundido, el nivel del l\u00edquido debe rociarse uniformemente con fundente de refinado<\/a>. Esto se debe a que, una vez que la burbuja de gas inerte ha sacado las inclusiones de la superficie del l\u00edquido, si existe una capa de fundente en dicha superficie, las inclusiones se introducir\u00e1n en el fundente y se convertir\u00e1n en escoria fundida, que resulta f\u00e1cil de retirar. De lo contrario, las inclusiones de mayor densidad volver\u00e1n a caer en el aluminio l\u00edquido, mientras que las de menor densidad formar\u00e1n una capa de espuma en la superficie del aluminio l\u00edquido, que resulta dif\u00edcil de separar del propio aluminio l\u00edquido. Dado que la adsorci\u00f3n se produce en la interfaz entre la burbuja y el metal fundido, solo puede entrar en contacto con una cantidad limitada de metal fundido, por lo que el efecto de eliminaci\u00f3n de escoria es limitado.<\/p>\n

Cuantas m\u00e1s burbujas se generen, cuanto menor sea el radio de las burbujas, cuanto m\u00e1s uniforme sea la distribuci\u00f3n y cuanto m\u00e1s prolongado sea el tiempo de soplado, mejor ser\u00e1 el efecto de eliminaci\u00f3n de escoria.<\/p>\n

Se basa en el principio de desgasificaci\u00f3n por diferencia de presi\u00f3n parcial. Dado que la burbuja de gas inyectada en la masa fundida no contiene hidr\u00f3geno, su presi\u00f3n parcial de hidr\u00f3geno es cero, mientras que la presi\u00f3n parcial de hidr\u00f3geno en la masa fundida cercana a la burbuja es muy superior a cero. Por lo tanto, existe una diferencia de presi\u00f3n parcial de hidr\u00f3geno entre el interior y el exterior de la burbuja, lo que hace que el hidr\u00f3geno disuelto en el metal se difunda continuamente hacia el interior de la burbuja, y que el hidr\u00f3geno que entra en ella se escape a la atm\u00f3sfera a medida que la burbuja asciende. Adem\u00e1s, las microburbujas de hidr\u00f3geno suspendidas en el metal fundido y el gas presente en las inclusiones tambi\u00e9n pueden ser expulsadas de la superficie del l\u00edquido mediante flotaci\u00f3n durante el proceso de flotaci\u00f3n de la burbuja, con lo que se logra el objetivo de desgasificar el metal fundido.<\/p>","protected":false},"excerpt":{"rendered":"

Molten Metal Degassing is important step in metal casting process. Degassing with Nitrogen is usually used. Inert gas refers to the gas that does not…<\/p>","protected":false},"author":1,"featured_media":4716,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4347,4686],"class_list":["post-4715","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-with-nitrogen","tag-molten-metal-degassing"],"yoast_head":"\nMolten Metal Degassing | Degassing with Nitrogen<\/title>\n<meta name=\"description\" content=\"Molten Metal Degassing is important step in casting process. Degassing with Nitrogen is usually used. 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