| Autor: |
Gogotsi, G., Dub, S., Ozerskii, B., Ostrovoi, D., Khomenko, G., Lomonova, E., Batygov, S., Vishnyakova, M., Kalabukhova, V., Lavrishchev, S., Myzina, V. |
| Zdroj: |
Refractories; 1995, Vol. 36 Issue 7, p199-207, 9p |
| Abstrakt: |
Results obtained for a new material, namely, zirconia crystals stabilized by YO and CeO and containing a technological addition of neodymium oxide, tested at room temperature are described. Special features of the surfaces of the crystal blocks grown and the distribution of the additions introduced into the charge over their height are investigated. The dependences of the amounts of the stabilizing components and the fracture properties of the investigated material on its strength are determined. Certification results for the mechanical characteristics of the material are presented (mean four-point bending strength 1250 MPa, crack resistance in bending of a notched bar 11.43 MPa·m at an elasticity modulus of 366 GPa for the crystallographic direction 〈100〉). The crystals are investigated in the crystallographic plane {100} by applying Vickers and Knoop indenters, and their hardness at different loads (beginning with 0.1 N) is determined. It is established that zones of phase transformations are formed near the indentations in addition to radial and lateral cracks. Problems of change in the specific features of the mechanical behavior of the crystals with change in the valence of cerium (most experiments were conducted for CeO), with the heat treatment, etc. are considered. The results are analyzed using data of fractographic investigations and the new data obtained in tests of similar crystals partially stabilized by yttrium and terbium oxides. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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