Abstract
El objetivo de este trabajo es investigar las propiedades mecánicas y tribológicas de refuerzos de dióxido de titanio (TiO2) en una matriz de aluminio (Al). Se utilizó aluminio de pureza 99,8% reforzado con TiO2 ensayándose cinco cantidades diferentes de dióxido de titanio. Se mezcló polvo de aluminio y TiO2 en un molino de bolas durante 30 min, utilizando un mezclador con eje descentrado. La mezcla se compactó mediante la técnica de prensado en frío a una presión de 250 MPa. Se utilizaron dos métodos diferentes para el sinterizado. El compactado en verde se sinterizó a 600 ºC durante 300 s en atmósfera ambiental con un sistema de inducción de ultra alta frecuencia (UHFIS) y con un horno convencional a 600 °C durante 1800 s. Las propiedades mecánicas y micro-estructurales de las muestras se compararon utilizando diferentes cantidades de refuerzo. La dureza máxima se observó para un refuerzo con 5% en peso de TiO2.
Highlights
Aluminium alloys used in many applications because of their high strength, low density and good formability
Aluminium matrix composites (AMCs) reinforced with ceramic particles are relatively easy to process which are applied in various industrial domains (Hassani et al, 2014)
Additions of Mg have been shown to be effective in disrupting the oxide layer and faciliating the solid state sintering (SSS) of aluminium (Lumley, 2011)
Summary
Aluminium alloys used in many applications because of their high strength, low density and good formability. Aluminium matrix composites (AMCs) reinforced with ceramic particles are relatively easy to process which are applied in various industrial domains (Hassani et al, 2014). The oxide layer on bulk aluminium at room temperature varies between 10 to 20 nm while the layer can vary between 50 and 150 nm on powder This layer acts as a barier to solid state sintering (SSS). TiO2 has three different phases in nature which are anatase, rutile and brookite It is used as a heterogeneous catalyst and photocatalyst. The aim of this study was to examine the effect of TiO2 reinforcement in aluminium For this purpose the density, porosity, hardness, wear resistance, and microstructure of Al-TiO2 composites were investigated. The results of induction and furnace sintered examples have been compared with each other to see the mechanical and tribological effects of the sinter method
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