Sintering behaviour and microstructure of 3Y-TZP+8mol% CuO nano-powder composite

Manipulating microstructure and mechanical properties of CuO doped 3Y-TZP nano-ceramics using spark-plasma sintering

“…This result is very remarkable in contrast to the large amounts (80 vol.%) of monoclinic zirconia for ceramics prepared by pressureless sintering (PLS). [5][6][7] A relative small signal is observed at 2θ of 43.5 • in the XRD pattern of the as-polished SPSed specimen, which is ascribed to metallic Cu. After annealing at 500 • C the metallic Cu signal significantly reduces, while CuO (1 1 1) and CuO (1 1 1) reflections appear.…”

“…5,6,14 Composites of 3Y-TZP doped with 8 mol% of CuO (sample code 3YZ-8C) were prepared by ball-milling followed by subsequent ultrasonic vibration of the milled suspension and drying. For pressureless sintering the composite powder was isostatically pressed into a cylindrical green compact at 400 MPa and a Netzsch 402E dilatometer was used to study sintering behaviour in an oxygen flow as further described in Refs.…”

“…For pressureless sintering the composite powder was isostatically pressed into a cylindrical green compact at 400 MPa and a Netzsch 402E dilatometer was used to study sintering behaviour in an oxygen flow as further described in Refs. 5,6 SPS experiments were performed on a FCT FAST device (Type HP D 25/1, FCT Systeme, Rauenstein, Germany). The SPS procedure contains the following segments.…”

“…[5][6][7] In nanosized CuO doped 3Y-TZP dissolution of CuO in the 3Y-TZP matrix, starting below 600 • C, enhances grain boundary diffusivity and subsequently leads to fast densification in the intermediate sintering stage. At 860 • C a solid-state reaction between CuO and yttria, as segregated to the 3Y-TZP grain boundaries, occurs forming a solid Y 2 Cu 2 O 5 phase which retards densification and induces the formation of the thermodynamic stable monoclinic zirconia phase.…”

Mechanical properties of microwave sintered 8 mol% yttria stabilized zirconia

“…Many investigators applied the microwave sintering on the commercially available 8YSZ powder pellets and studied the mechanical properties by using the micro indentation technique, but the nano indentation studies of microwave sintered 8 mol% yttria stabilized zirconia bulk sample have not been reported by the previous researchers. 3YSZ -TZP ceramics was one of the promising materials for tribological applications, because of its high wear resistance, bending strength, fracture toughness and mechanical strength and low friction coefficient than cubic zirconia (Ran et al, 2007). Many investigators found the tribological characteristics of 3 mol% of yttria stabilized zirconia (3YSZ) sintered samples with and without metal oxide additives of CuO, MnO 2 , MgO, B 2 O 3 and reduced the coefficient of friction (Bas et al, 2004).…”