%0 Journal Article
%T Moldeo por inyecci車n a baja presi車n de suspensiones cer芍micas
%A Mill芍n
%A A. J.
%A Bravo
%A M.
%A Moreno
%A R.
%A Nieto
%A M. I.
%J Bolet赤n de la Sociedad Espaˋola de Cer芍mica y Vidrio
%D 1999
%I Sociedad Espa?ola de Cer芍mica y Vidrio
%X Injection moulding has received a significant attention for manufacturing of precise, complex shaped parts which could not be obtained by other methods. However, this technique implies the use of polimeric transport vehicles, associated to some problems that limit its use, such as the high working temperature (120oC-200oC), the complex and expensive machinery, the high injection pressures (7-150 MPa), the moulds corrosion, the long cycles for burning out, etc. These characteristics are the responsible for the low industrial use of this process, only available for big companies. An useful alternative to reduce costs and process complexity is the low pressure injection moulding. It has been stated that this technique can be used from aqueous suspensions, thus largely facilitating handling, machinery and reducing costs. This technique allows to decrease the content of polymeric materials down to 2-3 vol%, respect to 20-50 vol%, tipically employed in the high pressure technique, in such a way that it is not necessary a specific treatment for burning out, and then the number of rejected parts is lower. In this work, the advantages and limitations of the low pressure injection moulding (LPIM) process in water are described focusing critical parameters for the obtention of alumina parts, such as the rheological properties of the suspension at the injection temperature and the influence of the gelling additive. El moldeo por inyecci車n ha recibido una importante atenci車n para la manufactura de piezas de formas complejas y precisas que no se podr赤an obtener por otros m谷todos. Sin embargo, esta t谷cnica implica el uso de veh赤culos de transporte polim谷ricos que llevan asociados una serie de problemas que limitan su aplicaci車n, como son la elevada temperatura de trabajo (120o-200oC), la compleja y costosa maquinaria, la alta presi車n de inyecci車n (7-150 MPa), el r芍pido desgaste de los moldes, los largos ciclos necesarios para la eliminaci車n del material org芍nico, etc. Estas caracter赤sticas son las responsables del escaso auge industrial de este proceso, quedando solo al alcance de las grandes corporaciones. Una alternativa satisfactoria para reducir los costos y la complejidad del proceso es la Inyecci車n a Baja Presi車n. Recientemente se ha comprobado la posibilidad de emplear esta t谷cnica haciendo uso de suspensiones acuosas, lo que facilita enormemente la manipulaci車n, simplifica la maquinaria y abarata significativamente los costos. Esta t谷cnica permite reducir el contenido de material polim谷rico hasta un 2-3 % vol., respecto al 20-50 % vol., t赤picamente usado en la
%K Low Pressure Injection Moulding
%K Rheology
%K Alumina
%K Moldeo por inyecci車n a baja presi車n
%K Reolog赤a
%K Al迆mina
%U http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/965/998