M. Yu. Fedorov

Wear of tools from nitride ceramics when machining nickel-based alloys

The experimental results have demonstrated that tools made from nitride ceramics have high efficiency in the high-speed machining of nickel-based AP741NP alloy. The wear of these tools proved to depend on the cutting modes, as well as the properties and structure of ceramics. Features of the wear of cutting tools from nitride ceramics are determined when machining nickel-based AP741NP alloy.

Nitride Ceramic Surface Layer Stressed State Transformation with a Change in TiC-Coating Thickness. Stress – Distributed Force Load Version

As a result of conducting numerical experiments a complex effect is revealed for titanium carbide coating thickness on the change in stressed state of a Si3N4–TiC–Y2O3-ceramic surface layer under action of a distributed force. It is established that an increase in TiC-coating thickness leads to an increase in σi inhomogeneity and an ambiguous change in σ11, σ22, and σ12 inhomogeneity within a nitride ceramic surface layer.

Transformation of the Stressed State of a Surface Layer of Nitride Ceramic with a Change in TiC-Coating Thickness. Loading Version — Concentrated Force Load

The effect of titanium carbide coating thickness on transformation of the stressed state of a surface layer of Si3N4–TiC–Y2O3-ceramic under action of a concentrated force is studied. It is established that an increase in TiC-coating thickness leads to an increase in stresses σ11, σ22, σ12 and stress intensity σi within a nitride ceramic surface layer.

Stressed State of a Boundary Between Ceramic and Coating Under Action of a Combined Load

Basic features are revealed for the stressed state of a boundary between ceramic and coating with simultaneous action of heat flow, and concentrated and distributed forces. The effect of ceramic grain material on the stressed state of a ceramic–coating boundary is determined.

The Stressed State of the Boundary Between Ceramic and a Coating Under the Effect of Power Loads

A technique for the investigation of the stressed state of the boundary between ceramic and a coating is developed. The basic laws governing the development of stresses in the boundary layers of nitride ceramic and a coating made of titanium nitride under the effect of concentrated and distributed forces are found with the use of the technique. The need to take into account the stressed state of a ceramic — coating boundary in the course of analyzing the wear and degradation of ceramic parts in the course of design, manufacture, and service is noted.

Performance of channel cutters with ceramic plates in machining quenched steel

The cutting of channels in quenched-steel components is considered. A relation is established between the cutting parameters and the operational characteristics of tools with ceramic cutting plates.

Nitride Ceramic Surface Layer Stressed State Transformation with a Change in TiC-coating Thickness. Stress Version — Heat Flow

The effect of titanium carbide coating thickness on transformation of the stressed state of a Si3N4–TiC–Y2O3-ceramic surface layer under action of heat flow is studied. It is established as a result of numerical experiments that an increase in TiC coating thickness from 5 to 15 μm, applied to nitride ceramic, leads to a reduction in ceramic temperature, and increase in σ11, σ22, σ12, and σi, and indices of their structural inhomogeneity in a ceramic surface layer.

Transformation of the Stressed State of a Surface Layer of Nitride Ceramic with a Change in TiC-Coating Thickness. Loading Version – Combined Loading

As a result of conducting numerical experiments a favorable effect is revealed for titanium carbide thickness on transformation of the stressed state of a surface layer of Si3N4–TiC–Y2O3-ceramic. It is established that an increase in TiC-coating thickness leads to stable reduction in stresses σ11, σ22, σ12, and σi in a surface layer of the main structural elements.

Effect of Pulsed Laser Radiation on the Surface of Ceramic VOk71

Experimental studies have established that pulsed laser radiation significantly changes the condition of the surface of high-density ceramics. The processing regimes that are currently used have a substantial effect on the geometric parameters of each track that is formed and on the morphology of the new surface.

Stressed State of Boundary Between TiC/TiN-Coating Layers Applied to Nitride Ceramic Under Action of a Force Load

The main stressed state features are established at a boundary between layers of a two-layer TiC/TiN coating applied to nitride ceramic under action of concentrated and distributed forces. The effect of ceramic basic structural element on stresses formed in TiC/TiN-coating underlayers in contact under action of force loads is determined.