СТРУКТУРА И СВОЙСТВА ПОРОШКОВЫХ МАТЕРИАЛОВ НА ОСНОВЕ МЕХАНОСИНТЕЗИРОВАННЫХ МЕТАЛЛОМАТРИЧНЫХ КОМПОЗИТОВ Ni-TiC

Svetlana A. KOVALIOVA,Joint Institute Of Mechanical Engineering Of The Nas Of Belarus ,Viktor I. ZHORNIK,Pyotr A. VITYAZ,Tatiana F. GRIGOREVA,Dina V. DUDINA,Arina V. UKHINA,Tomila M. VIDYUK,Sergey V. VOSMERIKOV,Evgeniya T. DEVYATKINA,Nikolay Z. LYAKHOV,Joint Institute Of Mechanical Engineering Of The Nas Of Belarus ,Joint Institute Of Mechanical Engineering Of The Nas Of Belarus ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras ,Institute Of Solid State Chemistry And Mechanochemistry Of The Siberian Branch Of The Ras

doi:10.46864/1995-0470-2024-1-66-71-79

Svetlana A. KOVALIOVA, Joint Institute Of Mechanical Engineering Of The Nas Of Belarus + Show 18 more

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https://doi.org/10.46864/1995-0470-2024-1-66-71-79

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Abstract

The article considers the mechanochemical preparation of TiC-Ni composites in reaction mixtures of Ti-C-Ni powders and the formation of the structure of materials during their sintering under pressure. The synthesis was carried out in an AGO-2 planetary ball mill with a mixture processing time of 12 and 20 min; their subsequent sintering was performed at a temperature of 950 °C and a pressure of 130 MPa. The results of diffraction studies are presented for structural-phase transformations in mixtures of equimolar composition of titanium and carbon depending on the nickel content in the range of 50–70 wt.%. It is established that an increase in the Ni concentration leads to a decrease in the size of the formed TiCx crystallites from 29 ± 1 to 16 ± 1 nm. A high carbon content TiC0.88–0.98 carbide is formed in Ti-C-(50 and 60 %)Ni compositions and non-stoichiometric TiC0.62–0.78 at 70 % Ni. The microstructure of dispersion-strengthened grains of the nickel solid solution is formed during sintering of TiC/(50–60 %)Ni mechanocomposites. Titanium carbide inclusions have a spherical shape and a diameter of 60–100 nm. When sintering TiC/70%Ni, depleted titanium carbide has a grain boundary distribution with the formation of large (~400 nm) agglomerates. The microhardness of sintered materials is in the range of 850–900 HV.

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