Wear of Functionally Graded Coatings under Frictional Heating Conditions

Abstract

Multilayered and functionally graded coatings are extensively used for protection against wear of the working surfaces of mechanisms and machines subjected to sliding contact. The paper considers the problem of wear of a strip made of a functionally graded material, taking into account the heating of the sliding contact from friction. Wear is modeled by a moving strip along the surface of a hard abrasive in the form of a half-plane. With the help of the integral Laplace transform with respect to time, the solutions are constructed as convolutions from the law of the introduction of an abrasive into the strip and the original in the form of a contour integral of the inverse Laplace transform. The study of the integrands of contour quadratures in the complex plane allowed determination of the regions of stable solutions to the problem. Unstable solutions of the problem lead to the concept of thermoelastic instability of the contact with friction and formed regions of unstable solutions. The solutions obtained made it possible to determine a formula for the coefficient of functionally graded inhomogeneity of the coating material and to study its effect on the occurrence of thermoelastic instability of the contact taking friction into account, as well as on its main characteristics: temperature, displacement, stress and wear of the functionally graded material of the coating. The effects of the abrasive speed, contact stresses and temperature on wear of the coating with the functionally graded inhomogeneity of the material by the depth were investigated.

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

“…Functionally graded materials (FGMs) are a new generation of multifunctional materials that can be utilised as surface modifiers to mitigate the degradation of heat exchanger parts [101]. This is due to their compositional grading and microstructure, which can be altered to perform the desired function [102–105]. Figure 22 illustrates how two materials with different compositions and properties can be varied linearly to achieve tailored properties in a specific direction.…”

“…A significant amount of data about FGMs has been developed with continuous material property discrepancies, [11,105,115–119] especially on stainless steel, copper, and nickel.…”

Influence of Thermal Sensitivity of Functionally Graded Materials on Temperature during Braking

“…The problem of wear of an FGM strip with an account of the heating on sliding contact from friction has been considered in the study [ 10 ]. The exact solution of the problem was obtained with the help of the integral Laplace transform technique.…”

Temperature in the Friction Couple Consisting of Functionally Graded and Homogeneous Materials

“…It should be noted, however, that the obtained solutions did not allow determining automatically, with the help of limit transformations, solutions to the problems in the case when one of the friction pair elements is made of FGM and the other is homogeneous. Moreover, this type of friction pair is one of the most common [ 4 ]. Therefore, in this study, an attempt was made to develop a mathematical model for determining the temperature of a friction pair consisting of a body made of a two-component FGM, sliding on the surface of a homogeneous body.…”