Microstructural Model of the Surface Layer of Ceramics After Diamond Grinding Taking into Account Its Real Structure and
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Vol. 61, No. 3, September, 2020
MICROSTRUCTURAL MODEL OF THE SURFACE LAYER OF CERAMICS AFTER DIAMOND GRINDING TAKING INTO ACCOUNT ITS REAL STRUCTURE AND THE CONDITIONS OF CONTACT INTERACTION WITH ELASTIC BODY V. V. Kuzin,1,2 S. N. Grigor’ev,1 and M. A. Volosova1 Translated from Novye Ogneupory, No. 5, pp. 59 – 64, May, 2020.
Original article submitted April 30, 2020. On the basis of systematization of the results of investigation of the process of diamond grinding of Al2O3, TiC, Si3N4–TiC, Y–TZP, and SiSiC ceramic specimens, we managed to identify some general and specific features in the structures of their surface layers. These features are used to make an adequate choice of the basic elements of microstructural model and to make some assumptions. The developed model presented in the form of a structure takes into account the real structure of the surface layer and the conditions of contact with elastic body. Keywords: microstructural model, ground ceramics, surface layer (SL), diamond grinding, stress-strain state (SSS).
lem and the construction of an adequate mathematical model [14]. The aim of the present work is to construct a microstructural model of the SL of ceramics subjected to diamond grinding (ground ceramics) that takes into account its actual (experimentally determined) structure and the conditions of contact interaction with elastic bodies. The application of models of this kind makes it possible to study the SSS of SL for various kinds of ground ceramics with the use of computer simulations.
INTRODUCTION The procedure of diamond treatment affects the structure of the surface layer (SL) of ceramics [1 – 10]. The structurally transformed SL operating in contact with a mating component and receiving the entire complex of operating loads earlier than the basic material introduces noticeable corrections to the conditions of friction and wear of the ceramic components [11]. As one of the causes of this influence, we can mention the presence of a specific stress-strain state (SSS) formed in the SL of ceramics under the external action and creating favorable preconditions for the sudden failures of workpieces [12]. Therefore, the analysis of the influence of SL formed in the process of grinding on the SSS of ceramics under the conditions of contact interaction with elastic bodies proves to be an urgent scientific problem. The most efficient method for the solution of this problem is a computer simulation [13]. Its successful application to the analysis of various urgent problems in surface engineering is based on the detailed analysis of the fundamental physical phenomena required for the statement of the prob1 2
ANALYSIS OF THE EXPERIMENTAL DATA The construction of a microstructural model of the SL of ground ceramics was performed on the basis of generalization and systematization of the results of complex investigations of the process of diamond grinding of the specimens made of ceramics based on aluminum oxide, silicon nitride, silicon carbide, and zirconium dioxide [15 – 23]. The choice of these c
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