1. E.C. Subbarao, “Zirconia—An Overview,” Department of Metal- lurgical Engineering, Indian Institute of Technology, Konpur, India (1987).
2. R. Stevens, “Zirconia and Zirconia Ceramics,” Magnesium Elec- tron Publication No. 113, Magnesium Electron Ltd., Flemington, New Jersey, Jul (1986).
3. E. Lugscheider, H. Eschnauer, A. Nisch, and Z. Li, “Plasma Spray- ing of Plasma Densified Multicomponent Powders,” Proc. 12th ITSC Conf., London, The Welding Institute, Cambridge, Jun (1989).
4. ISO 3923, DIN 3923, “Determination of Apparent Density,” Nor- menausschuβ Pulvermetallurgie, Beuth Verlag, Berlin (1986).
5. ISO 4490, DIN 4490, “Determination of Flowability by Means of a Calibrated Funnel,” Normenausschuβ Pulvermetallurgie, Beuth Verlag, Berlin (1978).