Investigation of machinability of green bodies of solid cast alumina through the addition of a poly(carboxylate ether)-based superplasticizer

Official URL: http://risc01.sabanciuniv.edu/record=b1615025 (Table of Contents)

The performance of a poly(carboxylate ether) (PCE)– based superplasticizer to produce machinable green bodies from suspensions of alumina with 200 nm particle size was investigated. The theoretical maximum particle packing limit was found to be 45.7 vol%. An alumina loading of 35 vol% in the presence of 1.25 wt% superplasticizer was established to be suitable for drilling and removal of significant amount of material—59% reduction in volume (77% reduction in the diameter of the green bodies) was achieved. The lathed green bodies to produce terraced structures exhibited smooth surfaces without visible cracks. All of the green bodies were sintered without a polymer burnout step. Sintered solid cast bodies shrunk 16.1±1.8% at the outer diameter and 17.5±0.9% at the inner diameter.