Polycrystalline material, process for producing thereof, and articles manufactured therefrom

摘要

The proposed material consists of zirconium dioxide crystallites of tetragonal modification of acicular or platy form, having a size not exceeding 0.05 mm, oriented parallel to their long axes and forming a rectangular lattice. Such a structure of the material insures its increased resistance to the onset of cracking, this promoting high physico-mechanical characteristics of the material. The material is obtained under the conditions of lowered pressure by the method of melting in a cold container with its horizontal moving relative to an inductor. The physico-mechanical properties of the material make it possible to manufacture therefrom extremely sharp scalpels, which ensure the blade service life of up to 60 operations on dense tissues, the blades withstanding up to 10 resharpenings without changes in the blade profile.