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FEATURES OF DESTRUCTION OF MATERIAL SURFACE, STRENGTHENED BY PARTICLES

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The process of wear of ceramic composites with polycrystalline matrix of silicon carbide with dry friction in tool steel is considered. Fragile particles of various sizes are used as fillers of the composite matrix. Wear as a process of multiple surface destruction occurs in the field of mechanical stresses created by the interaction of roughnesses of contacting bodies, each roughness plays the role of an indenter, as in the case of "Hertz contact". Variation of the load makes it possible to regulate both the depth of the layer of the maximum tangential stresses and the numerical value of the stresses. The wear resistance of composites hardened by particles of 1—1000 μm in size is shown to depend on the ratio of the depth of the layer of maximal tangential stresses and the size of the hardening particles.

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