Samples and articles of materials with submicron structure
The basis of the method of obtaining thin-walled ceramic pipes (diameter - 15 mm, wall thickness - 0.4-0.5 mm, length ~ 100 mm) using radial MPP of nanoscale powders 10YSZ (figure 8) and Al2O3. The high efficiency of these products from 10YSZ in their tests as a carrier electrolyte in the real design of the electrochemical generator is shown: the density of the generated power is 470 mW/cm2 at a current density of up to 910 mA/cm2 and a test temperature of 950°C. These characteristics are 1.5 times higher than the characteristics achieved on fuel cells from electrolyte produced by traditional ceramic technologies.
With the use of radial MPP and subsequent thermal sintering, the basics of technology for producing thick-walled pipes with a channel of small diameter, about 2 mm, and a length of up to 70 mm from ceramics based on Al2O3 with additives TiO2 and MgO were worked out. The most technological material was ceramics with TiO2 additive, characterized by a fine structure and a hardness of 18-20 GPa at a relative density of about 98%. Such pipes, in particular, are promising for use as booster nozzles in waterjet cutting units. Samples of products are presented in the photo (figure 9).
The production of samples from the nanostructured materials under study - to study their structure, mechanical and functional properties - in the form of disks with a diameter in the range of 10 - 36 mm and a thickness of 0.5 - 5 mm. Examples of such samples from composite ceramics Аl2O3 +4.1YSZ are given in the figure (figure 10).