Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas, 2020
The article considers the problem of designing a tool for friction hardening to increase the fati... more The article considers the problem of designing a tool for friction hardening to increase the fatigue strength for conical threaded joints of elements of oilfield and drilling equipment. To increase the fatigue strength, a tool was developed for frictional strengthening of the working surface of the thread. The proposed design of the tool solves the current problem of simultaneous strengthening of depressions and side surfaces of the conical notch, which provides an increase in both fatigue strength and wear resistance. The design dimensions of the developed tool are determined using geometric modeling. The scientific novelty of the developed tool design is to solve the problem of simultaneous strengthening of depressions and surfaces of the conical groove profile, namely different lengths of the side surfaces of the conical groove, by modifying its lateral deforming elements. This simplifies the manufacture of the tool, increases the stability of the tool, the stability of the param...
ЗНОСОСТІЙКІ ГАЛЬВАНОПОРОШКОВІ КОМПОЗИЦІЙНІ ПОКРИТТЯ НА ЧОРНИХ МЕТАЛАХ
Composite electrolytic coatings (CEC) of the compositions Ni+B and Ni+B+Cr 3 C 2 were subjected t... more Composite electrolytic coatings (CEC) of the compositions Ni+B and Ni+B+Cr 3 C 2 were subjected to heat treatment in vacuum as well as treatment with laser, whichmarkedly improved their tribotechnical properties. The wear resistance increasedwith increasing friction loads. When the coatings were melted in vacuum, their wearresistance decreased by an order of magnitude for the Ni+B coatings and by twicefor Ni+B+ Cr 3 C 2 coatings, whereas upon melting with laser by 7-21 times. This isdue to the presence of inclusions of the Ni3 В boride and the Ni-В -Cr-C eutectic, characterizedby high mechanical properties.
Eastern-European Journal of Enterprise Technologies, 2020
Досліджено формування фазового складу, структури і властивостей електродугових покриттів порошков... more Досліджено формування фазового складу, структури і властивостей електродугових покриттів порошковими електродними матеріалами системи Fe-MoB -C. Сплави для наплавлення наносилися з використанням дугового наплавлення порошковими дротами (FCAW), які складались із оболонки з низьковуглецевої сталі, заповненої реакційною порошковою сумішшю, яка містила карбіду бору та молібден у пропорції 1:1. Розрахунок фазового складу сплавів, які відповідають наплавленим шарам методом CALPHAD з використанням програм Thermo-Calc OpenCalphad, показує, що за рівноважних умов боридні фази молібдену та ферит не можуть співіснувати. Основною фазою таких сплавів є сполука FeMo 2 B 2 , яка утворює евтектику із аустенітом. Враховуючи, що для евтектичних структур із боридами характерна висока крихкість, то введення компонентів проводилось у вигляді реакційної для отримання in situ сформованих боридних фаз у вигляді окремих структурних складових. Аналіз результатів дослідження мікроструктури та фазового складу покриттів показує, що вони складаються із трьох основних структуриних складових: фериту евтектики (FeMo 2 B 2 +фериту) та зерен тетрабориду молібдену MoB 4. Таким чином, за умов наплавлення реакційною сумішшю формується нерівноважна структура, яка є сприятливою із позиції забезпечення зносостійкості через високу мікротвердість MoB 4 > 27 ГПа. Твердість отриманих покриттів знаходиться на рівні 63-65 HRC, а зносостійкість є вищою порівняно із серійними високохромистими сплавами (марок Т620 та Т590) у 2-2,5 рази. Це дозволяє рекомендувати покриття даної системи для зміцнення робочих поверхонь обладнання у вугільній, переробній, деревообробній та ін. галузях, де домінуючим видом зношування поверхонь є абразивне. Ключові слова: порошкова стрічка, електродугове наплавлення, бориди молібдену, реакційний синтез, абразивне зношування.
The operating parameters of modern equipment for transportation, mixing and pressing of an abrasi... more The operating parameters of modern equipment for transportation, mixing and pressing of an abrasivecontaining masses are examined. The main wear modes are determined to which the working surfaces of the specified equipment are exposed during its operation. The list of main materials of which the working elements of the considered equipment are made, as well as the list of the main serial surfacing materials used for their hardening are shown. The mechanism of abrasive wear of coatings based on W 2 C-WC and coatings based on TiB 2-TiC was investigated.
Prospecting and Development of Oil and Gas Fields, 2018
The paper presents the results of research on the development of wear-resistant coatings on the w... more The paper presents the results of research on the development of wear-resistant coatings on the working surfaces of equipment and tools operating in conditions of intense abrasive wear. Titanium carbide alloyed high-manganese steel with a high strain hardening capacity served as the basis for coatings. The coating was made by electric arc surfacing with powder electrodes, the charge of which consisted of ferrosilicomanganese, titanium powder, graphite, and components that protect the arc from the atmosphere. The coatings consiss of manganese austenite and dispersed inclusions of titanium carbide with dimensions of ~ 1 micron. Rockwell hardness was measured my means of TK-2 hardness testers (GOST 3882-74) by indentation of a diamond cone under a load of ~ 150 N (scale C). Before measuring the hardness, the surface deposited layer was deformed using the TS-2 hardness gage. At the same time, a carbide ball with a diameter of 10 mm manufactured according to GOST 3722-81 was used as an i...
Increasing of durability of mechanical seals of oil and gas centrifugal pumps using tungsten-free cermet with Cu-Ni-Mn binder
Journal of physics, 2021
The rational materials selection for friction pairs is an important prerequisite in promoting of ... more The rational materials selection for friction pairs is an important prerequisite in promoting of reliable operation of mechanical seals used in centrifugal pumps. The experience of mechanical seals exploitation shows that most preferable is combination of “hard” and “soft” materials. As “hard” materials ceramics based on SiC, Al2O3, Si3N4, are the most commonly employed and for “soft” materials metal alloys, composites and carbon materials are widely used. In this study chromium carbide based composite metal-ceramic material with copper-nickel-manganese binder was developed for using in mechanical seals rings friction couples with silicon carbide (SiC) ring. Metal-ceramic sealing rings were manufactured by infiltration of pre-sintered porous chromium carbide skeletons with Cu60-Ni20-Mn20 melt at 1150 °C in protective (argon) atmosphere. Results of experimental investigations and theoretical modelling of heat transfer during friction, show significant advantages of proposed materials combination over ceramic-ceramic pairs through its better tribological characteristics and resistance to thermal shock. Industrial testing allows us to conclude that using of mechanical seal rings of proposed materials combination almost completely prevents failures of sealing rings surfaces caused by thermal cracking.
Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas, 2020
The article considers the problem of designing a tool for friction hardening to increase the fati... more The article considers the problem of designing a tool for friction hardening to increase the fatigue strength for conical threaded joints of elements of oilfield and drilling equipment. To increase the fatigue strength, a tool was developed for frictional strengthening of the working surface of the thread. The proposed design of the tool solves the current problem of simultaneous strengthening of depressions and side surfaces of the conical notch, which provides an increase in both fatigue strength and wear resistance. The design dimensions of the developed tool are determined using geometric modeling. The scientific novelty of the developed tool design is to solve the problem of simultaneous strengthening of depressions and surfaces of the conical groove profile, namely different lengths of the side surfaces of the conical groove, by modifying its lateral deforming elements. This simplifies the manufacture of the tool, increases the stability of the tool, the stability of the param...
ЗНОСОСТІЙКІ ГАЛЬВАНОПОРОШКОВІ КОМПОЗИЦІЙНІ ПОКРИТТЯ НА ЧОРНИХ МЕТАЛАХ
Composite electrolytic coatings (CEC) of the compositions Ni+B and Ni+B+Cr 3 C 2 were subjected t... more Composite electrolytic coatings (CEC) of the compositions Ni+B and Ni+B+Cr 3 C 2 were subjected to heat treatment in vacuum as well as treatment with laser, whichmarkedly improved their tribotechnical properties. The wear resistance increasedwith increasing friction loads. When the coatings were melted in vacuum, their wearresistance decreased by an order of magnitude for the Ni+B coatings and by twicefor Ni+B+ Cr 3 C 2 coatings, whereas upon melting with laser by 7-21 times. This isdue to the presence of inclusions of the Ni3 В boride and the Ni-В -Cr-C eutectic, characterizedby high mechanical properties.
Eastern-European Journal of Enterprise Technologies, 2020
Досліджено формування фазового складу, структури і властивостей електродугових покриттів порошков... more Досліджено формування фазового складу, структури і властивостей електродугових покриттів порошковими електродними матеріалами системи Fe-MoB -C. Сплави для наплавлення наносилися з використанням дугового наплавлення порошковими дротами (FCAW), які складались із оболонки з низьковуглецевої сталі, заповненої реакційною порошковою сумішшю, яка містила карбіду бору та молібден у пропорції 1:1. Розрахунок фазового складу сплавів, які відповідають наплавленим шарам методом CALPHAD з використанням програм Thermo-Calc OpenCalphad, показує, що за рівноважних умов боридні фази молібдену та ферит не можуть співіснувати. Основною фазою таких сплавів є сполука FeMo 2 B 2 , яка утворює евтектику із аустенітом. Враховуючи, що для евтектичних структур із боридами характерна висока крихкість, то введення компонентів проводилось у вигляді реакційної для отримання in situ сформованих боридних фаз у вигляді окремих структурних складових. Аналіз результатів дослідження мікроструктури та фазового складу покриттів показує, що вони складаються із трьох основних структуриних складових: фериту евтектики (FeMo 2 B 2 +фериту) та зерен тетрабориду молібдену MoB 4. Таким чином, за умов наплавлення реакційною сумішшю формується нерівноважна структура, яка є сприятливою із позиції забезпечення зносостійкості через високу мікротвердість MoB 4 > 27 ГПа. Твердість отриманих покриттів знаходиться на рівні 63-65 HRC, а зносостійкість є вищою порівняно із серійними високохромистими сплавами (марок Т620 та Т590) у 2-2,5 рази. Це дозволяє рекомендувати покриття даної системи для зміцнення робочих поверхонь обладнання у вугільній, переробній, деревообробній та ін. галузях, де домінуючим видом зношування поверхонь є абразивне. Ключові слова: порошкова стрічка, електродугове наплавлення, бориди молібдену, реакційний синтез, абразивне зношування.
The operating parameters of modern equipment for transportation, mixing and pressing of an abrasi... more The operating parameters of modern equipment for transportation, mixing and pressing of an abrasivecontaining masses are examined. The main wear modes are determined to which the working surfaces of the specified equipment are exposed during its operation. The list of main materials of which the working elements of the considered equipment are made, as well as the list of the main serial surfacing materials used for their hardening are shown. The mechanism of abrasive wear of coatings based on W 2 C-WC and coatings based on TiB 2-TiC was investigated.
Prospecting and Development of Oil and Gas Fields, 2018
The paper presents the results of research on the development of wear-resistant coatings on the w... more The paper presents the results of research on the development of wear-resistant coatings on the working surfaces of equipment and tools operating in conditions of intense abrasive wear. Titanium carbide alloyed high-manganese steel with a high strain hardening capacity served as the basis for coatings. The coating was made by electric arc surfacing with powder electrodes, the charge of which consisted of ferrosilicomanganese, titanium powder, graphite, and components that protect the arc from the atmosphere. The coatings consiss of manganese austenite and dispersed inclusions of titanium carbide with dimensions of ~ 1 micron. Rockwell hardness was measured my means of TK-2 hardness testers (GOST 3882-74) by indentation of a diamond cone under a load of ~ 150 N (scale C). Before measuring the hardness, the surface deposited layer was deformed using the TS-2 hardness gage. At the same time, a carbide ball with a diameter of 10 mm manufactured according to GOST 3722-81 was used as an i...
Increasing of durability of mechanical seals of oil and gas centrifugal pumps using tungsten-free cermet with Cu-Ni-Mn binder
Journal of physics, 2021
The rational materials selection for friction pairs is an important prerequisite in promoting of ... more The rational materials selection for friction pairs is an important prerequisite in promoting of reliable operation of mechanical seals used in centrifugal pumps. The experience of mechanical seals exploitation shows that most preferable is combination of “hard” and “soft” materials. As “hard” materials ceramics based on SiC, Al2O3, Si3N4, are the most commonly employed and for “soft” materials metal alloys, composites and carbon materials are widely used. In this study chromium carbide based composite metal-ceramic material with copper-nickel-manganese binder was developed for using in mechanical seals rings friction couples with silicon carbide (SiC) ring. Metal-ceramic sealing rings were manufactured by infiltration of pre-sintered porous chromium carbide skeletons with Cu60-Ni20-Mn20 melt at 1150 °C in protective (argon) atmosphere. Results of experimental investigations and theoretical modelling of heat transfer during friction, show significant advantages of proposed materials combination over ceramic-ceramic pairs through its better tribological characteristics and resistance to thermal shock. Industrial testing allows us to conclude that using of mechanical seal rings of proposed materials combination almost completely prevents failures of sealing rings surfaces caused by thermal cracking.
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