Polycrystalline material, method for the production thereof and articles made therefrom

摘要

The inventive material consists of tetragonally modified needle- or lamellar-shaped zirconium dioxide crystallites having dimensions not exceeding 0.05 mm, which are oriented parallel to larger axes thereof and forming a rectangular grid. Such a structure of the material ensures its increased resistance to initial cracking, providing high physical-chemical characteristics thereof. The material is obtained at a relieved pressure by melting into a cold container with horizontal displacement thereof relative to an inductor. The physical-chemical characteristics make it possible to produce highly-sharp scalpels with an operating life up to 60 operations on thick tissues using this material, ten regrindings can occur without the need to change a profile of the tool.