Search academic texts

Information × Registration Number 0221U100899, 0118U000459 , R & D reports Title Increase of wear resistance and corrosion strength of titanium alloys synthesized by powder metallurgy popup.stage_title Head Pohreliuk Iryna M., Доктор технічних наук Registration Date 11-01-2021 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description2  The corrosion resistance of titanium and titanium alloys synthesized by powder metallurgy in an aggressive environment of hydrochloric acid of a wide concentration range is estimated. It is shown that the residual porosity is a key structural factor that determines the corrosion resistance of sintered titanium powder VT1-0 and alloy VT6. The requirements for the porosity of sintered titanium powder to maintain corrosion resistance in hydrochloric acid at the level of deformable titanium are outlined. The principles of selection of the main technological parameters for ensuring high corrosion resistance of sintered titanium powder VT1-0 and alloy VT6 are formulated. It is established that additional operations of cold pressing and vacuum sintering in obtaining sintered titanium powder help to reduce its porosity. The efficiency of deformation and deformation-diffusion treatments to increase the corrosion resistance of titanium powder metallurgy synthesized by the method of powder metallurgy is evaluated. It was found that cold plastic deformation of the surface of sintered titanium powder (P = 9%) reduces the porosity of the surface layer, homogenizes it, which increases the corrosion resistance in 20% aqueous hydrochloric acid. The efficiency of two-stage nitriding to increase the corrosion resistance of sintered titanium alloy VT6 with porosity ≤4% was confirmed. Temperature-time parameters of nitriding for formation of protective surface layers of regulated morphology are optimized. The regime of chemical-thermal treatment in a gaseous nitrogen-containing medium of sintered titanium alloy VT6 is recommended, which increases the corrosion resistance in 30% hydrochloric acid by one or two orders of magnitude. The tribo-technical behavior of sintered titanium VT1-0 and alloy VT6 with boundary lubrication paired with steel and bronze was studied. Product Description popup.authors Baranetsʹkyy Volodymyr S Veselivsʹka Halyna H Dovhunyk Volodymyr M Kovalʹchuk Ihor V Kordyukevych Myron O Krayevsʹkyy Petro P Kravchyshyn Taras M Kudlak Stepan M Kukhar Ivan S. Lavrys Serhii M. Luk'yanenko Oleksandr H Maletsʹ Mykhaylo M Melʹnyk Khrystyna R Petryshyn Mykhaylo S Pohreliuk Iryna M. Proskurnyak Roman V Student Mykhaylo M Tkachuk Oleh V Trush Vasylʹ S Fedirko Viktor M Chaban Orest S Chumalo Halyna V. Shlyakhetka Khrystyna S. popup.nrat_date 2021-01-11 Close