Effect of ZrB&lt;sub&gt;2&lt;/sub&gt;, CrB&lt;sub&gt;2&lt;/sub&gt; and TiB&lt;sub&gt;2&lt;/sub&gt; Additives on the Tribological Characteristics of NiAl-Based Gas-Thermal Coatings

Umanskyi, Oleksandr; Poliarus, Olena; Ukrainets, Maksym; Martsenyuk, I. S.

doi:10.4028/www.scientific.net/kem.604.20

Cited by 18 publications

(8 citation statements)

References 2 publications

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“…The friction coefficient of coating is low. The oxide films are formed both on the NiAl matrix and reinforcing phases during tribological test 20 . They further act as protective layer.…”

Section: Coating Propertiesmentioning

confidence: 99%

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Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

Xia

Xie

et al. 2021

Mat. Res.

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NiAl composite coating strengthened by ZrC and ZrB 2 phases is synthesized by the plasma cladding process. The influence of cladding speed on microstructrue and properties of coatings is studied. The main phases of coatings are NiAl, γ-(Fe,Ni), ZrC and ZrB 2 phases. ZrC is in the shape of points and small blocks, ZrB 2 shows long strips and needle bar. The slower the cladding speed, the larger the size of the reinforcing phases. With the increase of cladding speed, the wear resistance of the coatings improves. Coating with the cladding speed of 10mm/s has excellent wear-resistance property owing to high hardness and low friction coefficient. ZrC and ZrB 2 strengthening phases play an important role. The main wear mechanism of NiAl composite coating is adhesive wear.

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“…The friction coefficient of coating is low. The oxide films are formed both on the NiAl matrix and reinforcing phases during tribological test 20 . They further act as protective layer.…”

Section: Coating Propertiesmentioning

confidence: 99%

“…The oxide films of ZrC and ZrB 2 grains can also been formed on the surface of reinforcements. The oxide films act as a protective layer which prevents the adhesive interaction of mating surfaces 20 . It makes the composite coatings good wear resistance.…”

Section: Coating Propertiesmentioning

confidence: 99%

Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

Xia

Xie

et al. 2021

Mat. Res.

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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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“…However, further progress is limited by its poor wear resistance. This drawback has been eliminated by protecting their most exposed surfaces with plasma sprayed (PS) metal matrix composite (MMC) coatings composed of an NiAl matrix and various ceramic phase additions, namely TiB 2 , ZrB 2, or CrB 2 (Umanskyi et al, 2014; Awotunde at al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating on the Microstructure of NiAl + CrB₂ Coatings Deposited by Mechanical Embedding in a Ball Mill

et al. 2021

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The thickness of NiAl + CrB2 coatings, produced by the mechanical embedding of powders, is limited due to the increasing brittleness of processed materials with milling time. Only the NiAl grain growth and resultant softening of the coating matrix could overcome this problem. Therefore, the effect of heating up to 750°C on the microstructure of NiAl + CrB2 coatings deposited in a ball mill rotating at 350 rpm was investigated through in situ TEM observations. The performed observations proved that defect annihilation starts at ~400°C in large intermetallic grains, which are first attached to the substrate. The growth in NiAl nanocrystallites forming most of the coating is activated only above ~600°C. The average crystallite size was measured to be 5, 14, and 19 nm at RT, 650°C, and 750°C, respectively. The first stage of nano-crystallite growth is relatively fast and connected with the reconstruction of crystallite boundaries using up the amorphous material accumulated in between them. The second stage is slower and involves the expansion of larger crystallites at the expense of smaller ones. The performed experiment proved that heating up to 750°C allows the microstructure recovery and grain coarsening of coatings to be activated.

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Effect of ZrB<sub>2</sub>, CrB<sub>2</sub> and TiB<sub>2</sub> Additives on the Tribological Characteristics of NiAl-Based Gas-Thermal Coatings

Cited by 18 publications

References 2 publications

Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

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

Effect of Heating on the Microstructure of NiAl + CrB₂ Coatings Deposited by Mechanical Embedding in a Ball Mill

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Effect of ZrB<sub>2</sub>, CrB<sub>2</sub> and TiB<sub>2</sub> Additives on the Tribological Characteristics of NiAl-Based Gas-Thermal Coatings

Cited by 18 publications

References 2 publications

Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

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

Effect of Heating on the Microstructure of NiAl + CrB2 Coatings Deposited by Mechanical Embedding in a Ball Mill

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Effect of Heating on the Microstructure of NiAl + CrB₂ Coatings Deposited by Mechanical Embedding in a Ball Mill