INVESTIGATION OF PRODUCTION PARAMETERS FOR FUNCTIONALLY GRADED Al-Al2O3 and Cu-Steatite

Abstract

In this study, determined amount of powder (Al-Al2O3 and Cu-Steatite) by weight are mixed homogeneously with 3-D shaker and then pressed to obtain FGM. Mixture ratios by weight vary from 80 % Al - 20 % Al2O3 to 20 % Al - 80 % Al2O3. Same mixture ratios are also prepaired for Cu-Steatite. For both of the mixtures, maximum ratio of metal (Aluminum and Copper) stay in the core while maximum ratio of ceramics (Al2O3 and Steatite) at the outer. Powder mixtures are passed through Hall funnel and appearant densities of them are calculated. Appearant density of Al-Al2O3 mixtures varies from 1.184 gr/cm3 to 1.344 gr/cm3 while it varies from 1.04 gr/cm3 to 2.352 gr/cm3 for Cu-Steatite mixtures. Aluminum tubes at successive diameters are placed into the cylindirical die of 32 mm diameter to seperate the different regions in the die before pressing. Each layer between the tubes corresponce to a different ratio of homogeneous mixture. Zinc stearate lubricant at the amount of 1% of each mixture by weight is added into each mixture before pressing. Pressing pressure varies from 700 MPa to 750 MPa. FGM specimen prepared from Al-Al2O3 mixture is sintered at 630 0C for 90 min and the one from Cu-Steatite 1030 0C for 60 min.

Keywords

• Functionally graded materials
• Powder Mettalurgy
• Sintering

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