Microstructure and tribological properties of laser-clad Ni–Cr/TiB2 composite coatings on copper with the addition of CaF2

Yan, Hua; Zhang, Peilei; Yu, Zhishui; Lu, Qinghua; Yang, Shanglei; Li, Chonggui

doi:10.1016/j.surfcoat.2012.03.086

Cited by 63 publications

(29 citation statements)

References 26 publications

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“…However, the wear mechanism of the coatings in this study is mainly comprised of abrasive and adhesive wear. Similar results also reported by other researchers [22,25]. On the other hand, Dai et al [19] reported that the wear mechanism of the coating is only abrasive wear.…”

Section: Microhardness Residual Stress and Wear Analysessupporting

confidence: 89%

“…Laser surface alloying (LSA) and laser cladding are important technologies, widely used to improve surface properties of Al alloys [2,[7][8][9][10][11][12][13][14][15], titanium alloys [16][17][18][19], magnesium alloys [20,21], copper alloys [22], nickel-copper alloys [23,24] and stainless steels [25][26][27]. However, with LSA process the selection of the alloying elements, compositional ratio and elemental surface distribution is crucial since it has a paramount effect towards microstructural development in the alloyed layer [28].…”

Section: Introductionmentioning

confidence: 99%

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Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties

Ravnikar

Trdan

Nagode

et al. 2020

Metals

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In the present work, TiC/TiB2/Al composite coatings were synthesized onto a precipitation hardened AlSi1MgMn alloy by laser surface alloying (LSA), using 13.3 J/mm2 and 20 J/mm2 laser energy densities. Microstructure evaluation, microhardness, wear and corrosion performance were investigated and compared with the untreated/substrate Al alloy sample. The results confirmed sound, compact, crackles composite coating of low porosity, with a proper surface/substrate interface. Microstructural analyses revealed the formation of extremely fine nano-precipitates, ranging from of 50–250 nm in the laser melted (LMZ) and large precipitates, accompanied with grain coarsening in the heat-affected zone (HAZ), due to the substrate overheating during the LSA process. Nonetheless, both coatings achieved higher microhardness, with almost 7-times higher wear resistance than the untreated sample as a consequence of high fraction volume of hard, wear resistant TiB2 and TiC phases inside the composite coatings. Further, cyclic polarization results in 0.5 M NaCl aqueous solution confirmed general improvement of corrosion resistance after LSA processed samples, with reduced corrosion current by more than a factor of 9, enhanced passivation/repassivation ability and complete prohibition of crystallographic pitting, which was detected with the untreated Al alloy.

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Section: Microhardness Residual Stress and Wear Analysessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties

Ravnikar

Trdan

Nagode

et al. 2020

Metals

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“…1). Specifically, the creation of supersaturated metastable structural states by laser cladding is reported in [1,11,15]. The metastable structural state formed during the heating to 900°C changes substantially (Fig.…”

Section: Resultsmentioning

confidence: 94%

“…Among the different methods of forming wear-resistant coatings laser surfacing has obvious advantages, because it provides good cohesion between the coating and the substrate, possibility of forming the coating only on the worn area, and low warping of the part due to local heating [14,15]. The high rates of cooling in laser surfacing (10 3 -10 8 K/sec) due to intense removal of heat into the depth of the part are responsible for formation of a supersaturated metastable structure in the coatings [1,11,15]; their transformations under heating may promote hardening of the alloys. As a rule, the heating temperatures of laser clad chromium-nickel coatings do not exceed 550 -800°C [1,11].…”

Section: Introductionmentioning

confidence: 99%

Formation of Wear-Resistant Chromium-Nickel Coating with Extra High Thermal Stability by Combined Laser-and-Heat Treatment

et al. 2015

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The influence of heat impact at 200 -1050°C on the structure, phase composition, microhardness and tribological characteristics due to sliding over a NiCrBSi fixed abrasive (corundum) is studied for a PG-10N-01 coating deposited by a gas-powder laser method. A combined laser-and-heat treatment is suggested, which yields a heat-resistant chromium-nickel coating containing a thermally stable high-strength wear-resistant skeleton of coarse carbides and chromium borides.

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“…However, the major failure of copper is its surface wear, which induces the surface's deformation, lowering the strength and hardness of copper materials compared to other materials. Therefore, there has been a great demand for improving the performance of its surface [1][2][3][4]. Among the various surface modification methods, one method-the in situ generation of particle-reinforced composites on the surface of metal materials-has the advantage of high controllability and cost-effectiveness, making it an effective way to enhance the surface wear resistance and service life of equipment [5].…”

Section: Introductionmentioning

confidence: 99%

The Microstructure and Wear Resistance of a Copper Matrix Composite Layer on Copper via Nitrogen-Shielded Arc Cladding

Liu

Zhou

et al. 2016

Coatings

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A TiN and TiN·Ti 2 Cu reinforced copper matrix composite layer was cladded onto a T3 copper substrate to improve the anti-wear performance of copper products by means of the nitrogen-shielded gas tungsten arc cladding method (N 2 -GTAC). Better than the traditional preparation method of TiN, the TiN particles in the cladding layer were in situ generated using N atoms of shielding gas and Ti atoms of pre-deposited metal powders. In addition, the composite phase TiN·Ti 2 Cu occurred in the cladding layer, which also had a positive effect on anti-wearing. As Ti increased, the amount and grain size of TiN·Ti 2 Cu and TiN increased as a result. The hardness of the cladding layer increased with the increasing amount of reinforced phase generated in the layer. The hardness of the layer reached a maximum of 410 HV, which is nearly 5.1 times greater than that of copper. The TiN·Ti 2 Cu-and TiN-reinforced phases improved the wear resistance of the cladding layers. The cladding layer with 15 wt % Ti had the longsest launch stage (600 s) and the lowest fiction coefficient (0.56).

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Microstructure and tribological properties of laser-clad Ni–Cr/TiB2 composite coatings on copper with the addition of CaF2

Cited by 63 publications

References 26 publications

Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties

Energy Density Effect of Laser Alloyed TiB2/TiC/Al Composite Coatings on LMZ/HAZ, Mechanical and Corrosion Properties

Formation of Wear-Resistant Chromium-Nickel Coating with Extra High Thermal Stability by Combined Laser-and-Heat Treatment

The Microstructure and Wear Resistance of a Copper Matrix Composite Layer on Copper via Nitrogen-Shielded Arc Cladding

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