Fabrication of green and sintered Al: Al2O3 composites using gel-casting and powder metallurgy technique

摘要: An effort had been made to fabricate composite of (1-x) wt% Al: x wt % Al2O3 (where = 0, 10, 20 30, 40, and 50) using both gel casting powder metallurgy techniques To the best our knowledge, there was no such literature available on Al-Al2O3 composites prepared through gel-casting technique. Prior zeta-potential, concentration deflocculating agent, viscosity were optimized. A mould designed fabricated a new processing route employed produce homogeneous green body which successful. Microstructure implies that sintered highly porous could not provide enough mechanical strength. However, product easily machinable. XRD analysis shows sign oxidation aluminium. It has be further studied before it for production. In metallurgy, attain proper mixing aluminium alumina in their powdered form are milled 1h planetary milling machine with isopropyl alcohol as wetting agent. Powders pressed samples different shape under vacuum. Normally at nitrogen or argon atmosphere. Some attachments manufactured used tubular furnace obtain The design successful able vacuum pressure 5.6E-6 mbars inside tube. found by reinforcing 20% hardness increased 35 HV. Bending test gives indication plasticity is reduced slowly addition into matrix. also tribological properties can improved adding weight metal. indicates well dispersed machinable HSS tool minimum wear. Therefore replace materials various automotive, aerospace, automobile industries.