Mass transfer trends during electrospark alloying

Galinov, I.V.; Luban, R. B.

doi:10.1016/0257-8972(95)02434-4

Cited by 64 publications

(39 citation statements)

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“…1c, d). It is believed [10,11] that cracks in sparkdeposited coatings are caused by the thermal stresses that remain after cooling of the liquid phase. That a regular crack network is absent over coatings even when alloying time is 7 min/cm 2 may be due to several reasons, the main of which is close thermal expansion coefficients of the basic coating components: ZrB 2 (5.9 ⋅ 10 -6 K -1 ), LaB 6 (6.4 ⋅ 10 -6 K -1 ), and SiC (4.7 ⋅ 10 -6 K -1 ).…”

Section: Resultsmentioning

confidence: 99%

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. I. microstructure and composition of ZrB2-containing coatings

Podchernyaeva

Panasyuk

Panashenko

et al. 2009

Powder Metall Met Ceram

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To improve the abrasive wear resistance of titanium alloys, ZrB 2 -containing protective coatings are deposited by electrospark alloying (ESA). As electrode materials, composite ceramics with different amounts of ZrB 2 are used. Some of the coated samples are also subjected to laser treatment to improve the coating by structuring the surface as alternating laser fusion tracks and nonfused sparkdeposited areas. The microstructure and phase composition of the coatings are characterized. The surface layer of the worn laser fusion tracks is found to have increased hardness , which is two to four times higher than that of the surface before abrasion (∼9.5 GPa). INTRODUCTIONComposite ceramics based on ZrB 2 -SiC and AlN-ZrB 2 with oxidation-resistant additions belongs to a new generation of wear-resistant high-temperature materials [1,2] that are an alternative to widely used composites based on refractory titanium compounds for coatings [3,4]. Protective coatings made of such ceramic materials can be deposited on metal alloys using, along with conventional methods, electrospark alloying (ESA) [4,5], which is very effective, simple, and low energy consuming.The abrasive resistance of composite ceramics is known [6] to be ambiguously dependent on hardness and fracture toughness but directly determined by strength characteristics. As an alloying electrode material, we therefore used ZrB 2 -ZrSi 2 (SiC)-LaB 6 and AlN-ZrB 2 -based composites with different amounts of zirconium diboride, which has the maximum elastic modulus as compared with the other solid phases of the materials in question.Resent research efforts have been aimed at developing composite coatings containing nanocrystalline components. Different methods are used for this purpose, such as vapor deposition of thin films of refractory compounds, including MoN [7], or attritor treatment of metal alloys, including low-carbon steel [8]. The surface may become nanostructured immediately during abrasive wear by a nonfixed abrasive in air. This process 317 mechanically activates the surface of metal alloys owing to plastic deformation in numerous cycles of rolling and sliding of the abrasive particles over the surface under loading. For the abrasive particles to mechanically activate the surface of rather brittle spark-deposited ceramic coatings, they should be preliminary treated. Laser fusion (LF) of the coating may be used for this purpose to form a fine grain matrix modified by alloying components on the substrate metal resulting from mixing of the coating and base components and rapid melt crystallization.Hence, it is of interest to examine the structural and phase transformations over spark-deposited and laserspark-deposited coatings before and after wear in air with a nonfixed abrasive. PROCEDURE AND MATERIALSElectrospark alloying was conducted at room temperature in air using an Élitron-21 high-frequency machine with a manual vibrator in optimal mode: current pulse frequency 1200 Hz, pulse energy 0.08 J, and time t = 7 min/cm 2 . To deposit coatings, composi...

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Section: Resultsmentioning

confidence: 99%

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. I. microstructure and composition of ZrB2-containing coatings

Podchernyaeva

Panasyuk

Panashenko

et al. 2009

Powder Metall Met Ceram

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“…Видно, что в покрытиях имеются поперечные трещины, а также хорошо различима граница между оса-жденным слоем и подложкой. Высокий градиент температур в области воздействия разрядов и со-путствующие термические напряжения растяжения являются основной причиной возникновения трещин в электроискровых покрытиях [19]. Рентгенодифракционные исследования покрытия, нанесенного в аргоне, показали, что кон-центрация интерметаллида Ti 3 Al в нем примерно такая же, как и в легирующем электроде (см.…”

Section: результаты и обсуждениеunclassified

WEAR RESISTANCE AND HEAT RESISTANCE OF THE ELECTRIC SPARK COATINGS BASED ON Ti3Al WITH THE ADDITION OF BORON CARBIDE

Pyachin¹,

Бурков²,

Vlasova³

et al. 2017

uzknastu

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Пячин Сергей Анатольевич -кандидат физико-математических наук, доцент, заведующий лабораторией функциональных материалов и покрытий Федерального государственного бюджетного учреждения науки, Института материаловедения Хабаровского научного центра ДВО РАН (Россия, г. Хабаровск); 680042, г. Хабаровск, ул. Тихоокеанская, 153, тел. (4212) Мокрицкий Борис Яковлевич -доктор технических наук, профессор кафедры «Технология машиностро-ения» Федерального государственного бюджетного образовательного учреждения высшего образования «Комсомольский-на-Амуре государственный технический университет» (Россия, г. Комсомольск-на-амуре); 681013, Хабаровский край, г. Комсомольск-на-Амуре, пр. Ленина, 27. E-mail^boris@knastu.ru. Mr. Boris Ya. Mokritskii -Doctor of Engineering, professor, Mechanical Engineering Department, Komsomolsk-on-Amur State Technical University (Russia, Komsomolsk-on-Amur); 681013, Komsomolsk-on-Amur, Lenin Ave., 27. E-mail: boris@knastu.ru.Зайкова Екатерина Романовна -магистр кафедры физика Федерального государственного бюджетного образовательного учреждения высшего профессионального образования «Тихоокеанский государственный университет» (Россия, г. Хабаровск), 680035, г. Хабаровск, ул. Тихоокеанская, 136, тел. (4212)22-43-47.

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“…Many works have studied the mass transfer that occurs during the ESD process [25][26][27], which is paramount to produce a high wear-resistant coating [28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Repairing 2024 Aluminum Alloy via Electrospark Deposition Process: A Feasibility Study

Renna

Leo

Casalino

et al. 2018

Advances in Materials Science and Engineering

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e electrospark deposition (ESD) technique has been studied as a potential method to repair locally damaged 2024 rolled sheets supplied in natural-aged (T4) and artificial-aged (T6) conditions. e 2024-T4 and 2024-T6 tensile samples were first notched, and then the notches were filled (repaired) by ESD with the same aluminum alloy. e effect of process parameters on the microstructure of the filling material and the substrate properties was studied by optical and scanning electron microscopy. Tensile and hardness tests were performed. e tensile test showed that T4 and T6 as-repaired specimens had low tensile properties, which was due to defectiveness and residual stress caused by high cooling rate during reparation. However, the asrepaired specimens were heat-treated at either 135°C or 190°C to improve the mechanical properties. A better yield strength was observed for the T4 heat-treated alloy. e ductility and ultimate tensile strength did not change, being mainly affected by voids and microcracks.

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Mass transfer trends during electrospark alloying

Cited by 64 publications

References 0 publications

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. I. microstructure and composition of ZrB2-containing coatings

Abrasive wear of ZrB2-containing spark-deposited and combined coatings on titanium alloy. I. microstructure and composition of ZrB2-containing coatings

WEAR RESISTANCE AND HEAT RESISTANCE OF THE ELECTRIC SPARK COATINGS BASED ON Ti3Al WITH THE ADDITION OF BORON CARBIDE

Repairing 2024 Aluminum Alloy via Electrospark Deposition Process: A Feasibility Study

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