Ran, S., Winnubst, A.J.A., Blank, D.H.A., Pasaribu, H.R., Sloetjes, J.W., Schipper, D.J.
Dense 8 mol% CuO-doped 3Y-TZP ceramics were prepared by pressureless sintering for 8 h at 1500° and 1550°C, respectively. Transmission electron spectroscopy revealed that the ceramic sintered at...
Electrochemical characterisation of 3Y-TPZ-Fe2O3 composites (2003)
Boukamp, B.A., Raming, T.P., Winnubst, A.J.A., Verweij, H.
The influence of the addition of ferric oxide to 3Y-TZP on the conductivity and microstructure of sintered Y-stabilised tetragonal zirconia ceramics (3Y-TZP) was investigated. A comparison was made...
Peroxo-oxalate preparation of doped barium titanate (1999)
The peroxo-oxalate complexation method is a method that can be used for the preparation of doped barium titanate. In this paper we focus on BaTi0.91Zr0.09O3, which can be used for discharge...
He, Y.J., Winnubst, A.J.A., Sagel-Ransijn, C.D., Burggraaf, A.J., Verweij, H.
The mechanical properties of ceramics with the compositions of 5 mol% YO1.5-TZP (ZY5) and 4 mol% YO1.5-4 mol% CeO2-TZP (ZY4Ce4) were investigated. Nanocrystalline powders of both TZPs were...
He, Y.J., Winnubst, A.J.A., Schipper, D.J., Bakker, P.M.V., Burggraaf, A.J., Verweij, H.
The friction and wear behaviour of ZrO2-Y203, ZrO2-Y203-CeO2 and ZrO2-A1203 composite ceramics against hardened steel AISI-52100 were investigated using a pin on plate configuration under...
The effect of ceria co-doping on chemical stability and fracture toughness of Y-TZP (1995)
Boutz, M.M.R., Winnubst, A.J.A., Langerak Van, B., Kreuwel, K., Burggraaf, A.J.
The fracture toughness and ageing resistance of yttria, ceria-stabilized tetragonal zirconia polycrystals (Y, Ce-TZP) were evaluated as a function of grain size and ceria content. Very fine grained,...
Effect of additives on densification and deformation of tetragonal zirconia (1994)
Boutz, M.M.R., Winnubst, A.J.A., Hartgers, F., Burggraaf, A.J.
The effect of additives (Bi2O3, Fe2O3) on densification and creep rates of tetragonal ZrO2-Y2O3 has been investigated. In Bi2O3-doped Y-TZP, a reactive liquid forms at temperatures above...
Improvement of mechanical properties of zirconia-toughened alumina by sinter forging (1994)
He, Y.J., Winnubst, A.J.A., Verweij, H., Burggraaf, A.J.
ZTA powder with a composition of 85 wt% alumina/15 wt% zirconia was prepared by a gel precipitation method. Sinter forging was performed with this powder to enhance the mechanical properties of ZTA...
Sinter forging of zirconia toughened alumina (1994)
He, Y.J., Winnubst, A.J.A., Verweij, H., Burggraaf, A.J.
Sinter forging experiments have been carried out on powder compacts of zirconia toughened alumina (ZTA) Ceramics Alumina-15 wt% zirconia was prepared by a gel precipitation method and calcined at...
Koebrugge, G.W., Winnubst, A.J.A., Burggraaf, A.J.
The preparation and characterisation of nanometre TiO2 powder materials, prepared by the sol–gel method, are described. Controlled hydrolysis of a titanium-2-methyl-2-butoxide precursor was applied...
Mechanical properties of ultra-fine grained zirconia ceramics (1992)
Bouma, J.S., Winnubst, A.J.A., Burggraaf, A.J.
The mechanical properties of tetragonal zirconia (TZP) materials doped with Y, Ce or Ti were studied as a function of temperature and grain size. Fine grained Y-TZP (grain size < 0.3 mgrm) shows...
Surface and grain boundary analysis of doped zirconia ceramics studied by AES and XPS (1992)
Winnubst, A.J.A., Burggraaf, A.J.
The surface- and grain boundary composition of Y, Ce and Ti doped zirconia were studied by X-ray Photoelectron Spectroscopy and Auger Electron Spectroscopy/Scanning Auger Microscopy. The grain...
Powder preparation and compaction behaviour of fine-grained Y-TZP (1990)
Winnubst, A.J.A., Burggraaf, A.J.
Two wet chemical preparation methods are described for yttria-doped tetragonal zirconia powders. Both methods yield powders with an extremely small crystallite size (8 nm) and a narrow size...
Microstructure characteristics of ultra-fine ZrO2---Y2O3 ceramic powdersstar, open (1989)
Winnubst, A.J.A., Burggraaf, A.J.
Yttria-doped zirconia powders with an extremely small crystallite size (8 nm) and a narrow size distribution have been prepared by gel precipitation methods. Precipitation of an alkoxide solution in...
Response behaviour of oxygen sensing solid electrolytes (1985)
Winnubst, A.J.A., Scharenborg, A.H.A., Burggraaf, A.J.
The response time (t r) after a step change in oxygen partial pressure was investigated for some solid electrolytes used in Nernst type oxygen sensors. The electrolyte as well as the (porous)...
Preparation and electrical properties of a monophasic ZrO2---Y2O3---Bi2O3 solid electrolyte (1984)
Winnubst, A.J.A., Burggraaf, A.J.
A preparation method is described of monophasic yttria stabilized zirconia doped with Bi2O3. This material is prepared from a homogeneous power which, after pressing, is sintered in a Bi2O3...
The luminescence of yitria stabilized zirconia doped with Bi2O3 (1984)
Blasse, G., Zhiran, Hao, Winnubst, A.J.A., Burggraaf, A.J.
Yttria stabilized zirconia doped with Bi2O3 shows an efficient luminescence due to the Bi3+ ions. Two luminescent centres were observed which are ascribed to BiO8 and BiO7 groups.
The electrode resistance of ZrO2---Y2O3(-Bi2O3) solid electrolytes with Pt electrodes (1984)
Winnubst, A.J.A., Scharenborg, A.H.A., Burggraaf, A.J.
The electrode resistance (Re1) at low over-voltages has been determined for Bi2O3 free and Bi2O3 doped yttria-stabilized zirconia with sputtered platinum electrodes. The anode and cathode resistances...
Mechanical properties and fracture behaviour of ZrO2-Y2O3 ceramics (1983)
Winnubst, A.J.A., Keizer, K., Burggraaf, A.J.
Stabilized ZrO2-Y2O3 ceramics have been prepared with varying grain sizes and microstructures with the help of different preparation techniques. Bi2O3 has been added as a sinter aid to some of the...
AES/STEM grain boundary analysis of stabilized zirconia ceramics (1983)
Winnubst, A.J.A., Kroot, P.J.M., Burggraaf, A.J.
Semiquantitative Auger Electron Spectroscopy (AES) on pure monophasic (ZrO2)0.83(YO1.5)0.17 was used to determine the chemical composition of the grain boundaries. Grain boundary enrichment with Y...
Effect of impurities on sintering and conductivity of yttria-stabilized zirconia (1982)
Verkerk, M.J., Winnubst, A.J.A., Burggraaf, A.J.
The effect of low concentrations of Fe2O3, Al2O3 and Bi2O3 on the sintering behaviour of (ZrO2)0.83 (YO1.5)0.17, made by alkoxide synthesis, has been investigated. The best results are achieved with...