Abstract
Modern hardening coatings, known as duplex coatings, are a combination of two types of surface treatment: preliminary ion nitriding of the substrate and subsequent deposition of a thin hardening film based on ceramic coatings. Nitriding is a process of diffusion saturation of the metal surface with a doping element (nitrogen from the gas phase). The key process parameters are the operating pressure and the temperature of the substrate, which determine the intensity of diffusion fluxes and the efficiency of processing. In this paper, we present a research of the influence of the pressure range (p 1 = 1000 P a, p 2 = 400 P a, and p 3 = 200 Pa) in the nitriding process of high-speed steel substrates and the development of a temperature measurement system with ceramic insert made of aluminum nitride that enabled us to control the temperature during the process in the range 470 °C −570 °C. The results show that pressure should not exceed 200 Pa.
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