Abstract: The invention pertains to the domain of metallurgy in particular, thermochemical surface treatment of products made of metals, mainly steels, and their alloys and it can be used for products hardening for the purpose of their service durability increase. The method of improvement of mechanical properties of products made of metals, mainly steels and alloys on their basis includes products nitriding in the gas atmosphere containing nitrogen and-or its compounds in the presence of a catalyst.

Abstract: A method for providing the interaction of the working medium with the heat energy source and also the interaction of the working medium with the additional low-temperature energy source, wherein the positron state of the Dirac's matter is used as said additional low-temperature energy source, and the interaction of the working medium with the additional low-temperature energy source is performed by bringing the working medium into the quantum-mechanical resonance with said state of matter. That is, in order to convert the heat energy into useful work, the capabilities of the quantum-mechanical resonances of the system ‘working medium—additional low-temperature energy source’ are used, i.e. in this case capabilities of the system ‘working medium—positron state of the Dirac's matter’ are used.