ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
To develop a novel separation technique of matrix alloys from metal matrix composite,separation experiments for various kinds of particle reinforced metal matrix composites (PRMMCs)were carried out. The Al-4mass%Cu alloy, Al-7mass%Si alloy and cast iron were used as matrix. TheSiC particles (particle size: 75μm) and Al2O3 particles (particle size: 120μm) were used asreinforcement. The PRMMC specimen was placed in a silica tube container with a small nozzle(nozzle size: 0.75mm) at the bottom and was melted by H.F. induction heating. Then the moltenPRMMC specimen was forced to flow out through the nozzle by applying a certain pressure of Ar gas.Most of the molten matrix alloy flowed out through the nozzle and the remainder in the containerconsisted of the reinforcements and a part of the matrix alloy. The amount of separated matrix alloyincreased with decreasing the volume fraction of reinforcement particles in PRMMC specimens.With decreasing the fabrication temperature from 1273K to 1073K, the amount of matrix alloyseparated from SiCP/Al-7mass%Si alloy composites increased. It is considered that a reaction layerformed on the surface of SiC particles at 1273K improves the wettability between the molten matrixalloy and SiC particle, which prevents the separation of molten matrix alloy from reinforcements. Onthe other hand, the amount of separated matrix alloy from 20vol% Al2O3P/cast iron composites wasvery high due to no reaction layer formed at interface between Al2O3 particle and cast iron
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1028.pdf
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