Evolution of interface in pulsed electrode deposited titanium diboride on copper and steel

Agarwal, Arvind; Dahotre, N.B.; Sudarshan, T. S.

doi:10.1179/026708499322911601

Cited by 25 publications

(7 citation statements)

References 8 publications

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“…composites, where nanocrystalline MgO and MgAl 2 O 4 particles grew at the interface and bonded with Si 3 N 4 whiskers. [18] Such an observation supports our earlier hypothesis of formation of metastable phase(s) during laser processing. ACKNOWLEDGMENTS Hence, it can be inferred that a superhard and tough composite boride coating can be synthesized by laser surface engi-…”

Section: Discussionsupporting

confidence: 81%

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Mechanical properties of laser-deposited composite boride coating using nanoindentation

Agarwal

Dahotre

2000

Metall Mater Trans A

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Nanoindentation proves to be an effective technique to measure mechanical properties of "composite" materials, as it has high spatial resolution that enables estimation of properties even from fine grains, particles, and precipitates. The elastic modulus, E, of the composite boride coating deposited on AISI 1010 steel using the laser surface engineering (LSE) process has been computed using the nanoindentation technique. The highest E value of 477.3 GPa was achieved for coating in a sample that contained 0.69 volume fraction of TiB 2 particles in the coating after processing with the highest laser traverse speed of 33 mm/s. A comparison between the theoretical and experimental computation of the elastic modulus suggests that theoretical elastic modulus values are lower than computed elastic modulus, as the latter includes the effect of dissolution of fine TiB 2 particles in Fe matrix and metastable phase formation such as Fe a B b and Ti m B n . Dissolution of fine TiB 2 particles in the Fe matrix in the coating region has been corroborated by transmission electron microscope (TEM) micrographs and corresponding energy-dispersive spectroscope (EDS) analysis and selected area diffraction (SAD) pattern.

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Section: Discussionsupporting

confidence: 81%

“…Further studies are ceramic. [16,17,18] However, due to extremely high energy input, laser processing results in unconventional reactions underway to investigate these fine TiB 2 particles.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of laser-deposited composite boride coating using nanoindentation

Agarwal

Dahotre

2000

Metall Mater Trans A

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“…The coefficients of thermal expansion of TiB 2 , Al 2 O 3 and Cu are 4.6, 5.31 and 17.8 × 10 −6 m/K at 293 K, respectively. The large mismatch between substrate and coating leads to tensile and compressive stresses at their interface when molten droplets of Al 2 O 3 -TiB 2 are deposited onto cold copper alloy substrate [19]. Thermal tensile stress increased throughout the deposition process, causing cracking of the coating and delamination at the poorly bonded interface.…”

Section: Resultsmentioning

confidence: 99%

Electrospark deposition of Al₂O₃–TiB₂/Ni composite-phase surface coatings on Cu–Cr–Zr alloy electrodes

Luo

Dong

Yangli

et al. 2015

Journal of Asian Ceramic Societies

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a b s t r a c tTo improve electrode life during the resistance spot welding of galvanized steel plates, an Al 2 O 3 -TiB 2 composite coating was synthesized on the surfaces of spot-welding electrodes through an electrospark deposition process. The microstructure, elemental composition, phase structure, and mechanical properties of the coating were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, and microhardness testing. It was found that extensive cracking occurred in the monolithic Al 2 O 3 -TiB 2 coating and at the coating-electrode interface. When the Al 2 O 3 -TiB 2 coating was deposited on electrodes precoated with Ni, the number of defects decreased significantly. Further, delamination did not occur, and fewer cracks were formed. The average hardness of the multilayered Al 2 O 3 -TiB 2 /Ni coating was approximately 2200 HV and higher than that of the monolithic Al 2 O 3 -TiB 2 coating (1100 HV).

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“…Pulsed electrode surfacing (PES) and its variants pulsed air arc deposition processes are high energy density microwelding processes [24][25][26]. These processes use short duration high current electrical pulses via discharge capacitance.…”

Section: Other Hardfacing Processmentioning

confidence: 99%

Hardfacing for Wear, Erosion and Abrasion

Badisch

Roy

2013

Surface Engineering for Enhanced Performance Against Wear

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Weld overlay coatings also known as hardfacing is a method which involves solidification for applied coatings. This method is as old as welding process and was first applied by J.W. Spencer in 1896. This technique offers unique advantages over other processes in that the overlay/substrate weld provides a metallurgical bond which is not susceptible to spallation and can easily be applied free of porosity and other defects. Weld deposits can have a thickness as high as 10 mm. Hardfacing process can be carried out easily even in on site. The process is also extremely versatile as a large variety of materials can be deposited for protection against degradation.Weld overlay coatings can be classified under four different categories. These are (1) surface cladding where a thick layer of materials is applied and the overlay layer can have completely different composition from the substrate, (2) hardfacing where a materials more resistant to degradation is applied with good metallurgical bonding and the composition can be close in terms of composition to that of the substrate, (3) build up where a weld deposit is applied to restore the original dimension of the component and the composition of the build layer is exactly similar to that of the substrate and (4) buttering where an intermediate layer is deposited before applying the final coating.The materials used for hardfacing should have melting point close to or lower than the substrate materials. During hardfacing, the temperature of the coating

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Evolution of interface in pulsed electrode deposited titanium diboride on copper and steel

Cited by 25 publications

References 8 publications

Mechanical properties of laser-deposited composite boride coating using nanoindentation

Mechanical properties of laser-deposited composite boride coating using nanoindentation

Electrospark deposition of Al₂O₃–TiB₂/Ni composite-phase surface coatings on Cu–Cr–Zr alloy electrodes

Hardfacing for Wear, Erosion and Abrasion

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Evolution of interface in pulsed electrode deposited titanium diboride on copper and steel

Cited by 25 publications

References 8 publications

Mechanical properties of laser-deposited composite boride coating using nanoindentation

Mechanical properties of laser-deposited composite boride coating using nanoindentation

Electrospark deposition of Al2O3–TiB2/Ni composite-phase surface coatings on Cu–Cr–Zr alloy electrodes

Hardfacing for Wear, Erosion and Abrasion

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Product

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Electrospark deposition of Al₂O₃–TiB₂/Ni composite-phase surface coatings on Cu–Cr–Zr alloy electrodes