of the invention is carried out starting from a particulate mixture consisting of a zironia powder the main characteristics of which appear in the following table 2 2 of polyethylene glycol peg 4000 and 45 of deionized water are added to the particulate mixture so as to form a starting charge the starting charge is dispersed in a mixer for 30 minutes and then dried by atomization the powder thus obtained is sieved through a sieve with a mesh size equal to 250 u03bcm the starting charge is formed by uniaxial pressing at a pressure of 100 mpa the preforms obtained are provided in the form of pellets with a diameter of 32 mm and a thickness of 5 mm the preforms are subsequently dried at 110 u00b0 c for 12 hours rise in temperature to 500 u00b0 c at 100 u00b0 c h maintenance at 500 u00b0 c for 2 hours rise in temperature up to 1450 u00b0 c at 100 u00b0 c h maintenance at 1450 u00b0 c for 2 hours drop in temperature by natural cooling the properties of the sintered parts obtained are summarized in table 3 examples 3 to 11 according to the invention are carried out starting from a particulate mixture obtained from the zirconia powder used.