High Temperature Sliding Wear of NiAl-based Coatings Reinforced by Borides

Umanskyi, Oleksandr; Poliarus, Olena; Ukrainets, Maksym; Antonov, Maksim; Hussainova, Irina

doi:10.5755/j01.ms.22.1.8093

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…Pin on disc test rig was used for conducting the experiments. The wear performance was found to be better when Ti, Cr and Zn diborides are added to metallic coatings [10].…”

Section: Introductionmentioning

confidence: 99%

Role of Velocity Discontinuity Imparted by Copper and Nickel Coatings of Different Thickness

Sharieff*¹,

Ranganatha²

2019

IJRTE

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In mating pairs system, the pairs will have relative motion among themselves resulting in damage of contacting surfaces. During such relative motions friction and wear occurs. Extensive research has been carried out for identifying friction and wear effects. One of the important factors is found to be discontinuity in velocity at the interacting surfaces. This discontinuity in velocity was found to have a major role in affecting coefficient of friction and wear.In the present investigation to impart velocity discontinuity copper and nickel coatings of different thickness, were coated on mild steel pin. The copper coating was incorporated by thermal spray technique and nickel coating was carried by electroplating technique. Experiments have been conducted using pin on disc test rig with speed 500 rpm, load 30 newton and sliding time 30 seconds. The shear force was monitored in personal computer and coefficient of friction was estimated. Scanning electron micrograph (SEM) and Energy dispersive analysis X-ray (EDAX) was carried out. The coefficient of friction was found to be dependent on type of coating materials. Coefficient of friction was in the range of 0.51 to 0.52 for copper coating and 0.43 to 0.46 for nickel coating. The observed features in scanning electron micrograph attribute dependency of friction coefficient on coating thickness. The energy dispersive analysis X-ray study reveals no oxidation of copper, nickel and iron.

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“…Pin on disc test rig was used for conducting the experiments. The wear performance was found to be better when Ti, Cr and Zn diborides are added to metallic coatings [10].…”

Section: Introductionmentioning

confidence: 99%

Role of Velocity Discontinuity Imparted by Copper and Nickel Coatings of Different Thickness

Sharieff*¹,

Ranganatha²

2019

IJRTE

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“…Intermetallic coatings, due to their high hardness, provide an effective protection against wear for less resistant materials, like stainless steel [1][2][3][4]. Modifying them by the addition of ceramic particles enabled us to improve their properties even more [5][6][7]. The coatings serving this purpose should be characterized by high adhesion and thickness in the range from tens to hundredths of micrometers.…”

Section: Introductionmentioning

confidence: 99%

Deposition of NiAl/Al3Ni2(CrB2) Coatings from Ni, Al and CrB2 Powders Using Mechanical Synthesis in Planetary Ball Mill

Szlezynger,

Toboła,

Morgiel

2024

Materials

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Interest in composite thick coatings with an intermetallic matrix stimulates the development of new deposition techniques like the co-milling of pre-alloyed NiAl powder with platelet-shaped substrates. Obtained coatings were up to several micrometers thick as cold-welding of intermetallic particles was effective only at the start of this process, while later, chipping prevailed over added material. The present experiment covered the co-milling in the planetary ball mill of Ni and Al elemental powders (1:1 molar ratio) with AISI 304 steel platelets for 32 h at 300 rpm. Next, this process was repeated with an admixture of 15 wt.% of CrB2 powder. In both cases, their milling succeeded in producing up to a 200 μm coating after 4 h. The use of light, scanning and transmission electron microscopy (LM/SEM/TEM) helped to establish that the coatings had gradient microstructures with more refined crystallites of NiAl, Al3Ni2 and CrB2 closer to the surface. With the addition of a ceramic phase, the coatings presented higher hardness and lower friction during dry wear tests both at RT and at 500 °C.

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“…In order to eliminate the latter drawback, numerous borides including TiB 2 , ZrB 2 , or CrB 2 with up to 30 vol% were tried as strengthening phases for NiAl matrix [4,5]. Eventually, the best improvement in wear resistance at 500 °C showed coatings with 15% CrB 2 addition [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Coatings on Nickel and Steel Platelets Obtained by Co-Milling with NiAl and CrB2 Powders

et al. 2019

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Metal matrix composite coatings are developed to protect parts made from materials susceptible to wear, like nickel alloys or stainless steel. The industry-established deposition method is presently an atmospheric plasma spraying method since it allows the production of both well-adhering and thick coatings. Alternatively, similar coatings could be produced by co-milling of ceramic and alloyed powders together with metallic plates serving as substrates. It results in mechanical embedding of the powder particles into exposed metallic surfaces required coatings. The present experiment was aimed at the analysis of microstructure of such coatings obtained using NiAl and CrB2 powders. They were loaded together with nickel and stainless steel platelets into ball mill vials and rotated at 350 rpm for up to 32 h. This helped to produce coatings of a thickness up to ~40 µm. The optical, scanning, and transmission electron microscopy observations of the coatings led to conclusion that the higher the rotation speed of vials, the wider the intermixing zone between the coating and the substrate. Simultaneously, it was established that the total thickness of the coating deposited at specified conditions is limited by the brittleness of its nanocrystalline matrix. An increase in the hardness of the substrate results in a decrease of the intermixing zone. The above results indicate that even as the method based on mechanical embedding could so far produce thinner coatings than the plasma spraying, in the former case they are characterized by a more uniform nanocrystalline matrix with homogenously distributed fine ceramic particles.

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High Temperature Sliding Wear of NiAl-based Coatings Reinforced by Borides

Cited by 8 publications

References 7 publications

Role of Velocity Discontinuity Imparted by Copper and Nickel Coatings of Different Thickness

Role of Velocity Discontinuity Imparted by Copper and Nickel Coatings of Different Thickness

Deposition of NiAl/Al3Ni2(CrB2) Coatings from Ni, Al and CrB2 Powders Using Mechanical Synthesis in Planetary Ball Mill

Microstructure of Coatings on Nickel and Steel Platelets Obtained by Co-Milling with NiAl and CrB2 Powders

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