Aluminium AlSi12 alloy matrix composites reinforced by mullite porous preforms

Abstract

The purpose of this work was to elaborate the method of manufacturing of composite materials based on porous mullite preforms infiltrated by AlSi12 aluminium alloy. The process of manufacturing the metal matrix composites by pressure infiltration is the subject of many scientific studies because it is characterized by high efficiency and allows for accurate mapping of elements of shape and surface of elements, while the structure and properties of the composites are determined by ceramic skeletons. The eutectic aluminium alloy AlSi12 was used as a matrix while as a reinforcement were used ceramic preforms fabricated by sintering of halloysite nanotubes (HNT) powder with an addition of carbon fibres as pore forming agents. The observations of the structure were made on the light microscope and in the scanning electron microscope. The developed technology of manufacturing of composite materials with the pore ceramic mullite infiltration ensures the expected structure and can be used in practice. The composite materials made by the developed method can find application as an alternative material for elements fabricated from light metal matrix composite material reinforced with ceramic fibrous preforms.

Abrasive Wear of AlSi12-Al2O3 Composite Materials Manufactured by Pressure Infiltration

“…The use of particles or short fibres (discontinuous reinforcement) results that matrix always takes part in the load carrying. In this case, the main factor determining the properties of the composite material is formed during the process of the structure connection between its components [9,[11][12][13][14][15][16][17][18][19][20]. Fig.1.…”

Manufacturing of Porous Ceramic Preforms Based on Halloysite Nanotubes (Hnts)

“…Sintered ceramic preforms can be obtained by many methods [6][7][8][9]. However, sintering of ceramic powders with the addition of pore-forming agents (e.g.…”

Analysis of crystallization kinetics of cast aluminum–silicon alloy

“…In their structure, irregular eutectic plates with a few original silicon precipitates occur. Eutectic morphology can be changed by reducing the concentration of silicon and thermal or chemical modification [1][2][3][4][5][6][7][8][9][20][21][22][23][24]. Paramount types of aluminum cast alloys with silicon are ternary alloys Al-Si-Cu.…”

“…Al 2 Cu. The addition of copper moves the eutectic point toward lower concentration of silicon [1][2][3][4][5][6][7][8][9][20][21][22][23][24]. Copper and magnesium are incorporated into the Al-Si alloys to perform heat treatment of the casts and a precipitation hardening, thereby improving their mechanical properties.…”

“…Due to the silicon concentration ranging from 4 to 9 mass%, the alloys are hypo-eutectic alloy. A decrease in the silicon concentration in the ternary alloys of Al-Si-Mg and Al-Si-Cu extends the solidification temperature range while also affecting the deterioration of the casting, as it makes them a tendency to shrinkage porosity, hot cracking, and reduce castability [1][2][3][4][5][6][7][8][9][20][21][22][23][24]. Copper and magnesium are added in order to improve their mechanical properties and fatigue after solution and artificial aging.…”