Sintering behavior of nickel-zirconia composites

Reference	Presenter	Authors (Institution)	Abstract
12-009	Vera Lúcia Arantes	Arantes, V.L.(Universidade de São Paulo); Coutinho, R.B.(Universidade de São Paulo); Martins, S.d.(Universidade de São Paulo);	Ceramic-metal composites (cermets) composed of nickel and doped 3 mol% yttria stabilized zirconia (3YSZ) present high values of mechanical resistance, fracture toughness and thermal conductivity. Densification kinetics of nickel-zirconia composites, containing 5, 10, 15% in volume of nickel with medium particle sizes around 40?m, has been evaluated from sintering with distinct constant rates of heating. Green compacts of nickel and zirconia (3YSZ), close to 56% of theoretical density, have been submitted to dilatometry at constant rates of 5, 10 and 20ºC/min. Based on dilatometric shrinkage curves analysis to determine the sintering and shrinkage behavior, the kinetics of the corresponding process has been studied by estimation of the apparent activation energy (Q). The density of fired pellets was determined using Archimedes' technique.
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