WELDING OF CERAMICS SiO2-Al2O3 BY LASER BEAM

Paris, Amaury; Robin, M.; Fantozzi, Gilbert

doi:10.1051/jp4:1991726

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…5). The glass phase was also found by de Paris et al [56], Shieh et al [57], Li et al [58], Lawrence and Li [59], and Deng et al [60] in their study of laser-induced alumina/silica system. The final microstructure of the melt-grown AMC is composed of corundum embedded in a continuously distributed mullite matrix, and there is a small amount of glass phase between mullite crystals.…”

Section: Microstructuresupporting

confidence: 66%

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Zhao

Shi

et al. 2021

J Adv Ceram

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Melt-grown alumina-based composites are receiving increasing attention due to their potential for aerospace applications; however, the rapid preparation of high-performance components remains a challenge. Herein, a novel route for 3D printing dense (< 99.4%) high-performance melt-grown alumina-mullite/glass composites using directed laser deposition (DLD) is proposed. Key issues on the composites, including phase composition, microstructure formation/evolution, densification, and mechanical properties, are systematically investigated. The toughening and strengthening mechanisms are analyzed using classical fracture mechanics, Griffith strength theory, and solid/glass interface infiltration theory. It is demonstrated that the composites are composed of corundum, mullite, and glass, or corundum and glass. With the increase of alumina content in the initial powder, corundum grains gradually evolve from near-equiaxed dendrite to columnar dendrite and cellular structures due to the weakening of constitutional undercooling and small nucleation undercooling. The microhardness and fracture toughness are the highest at 92.5 mol% alumina, with 18.39±0.38 GPa and 3.07±0.13 MPa·m1/2, respectively. The maximum strength is 310.1±36.5 MPa at 95 mol% alumina. Strength enhancement is attributed to the improved densification due to the trace silica doping and the relief of residual stresses. The method unravels the potential of preparing dense high-performance melt-grown alumina-based composites by the DLD technology.

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Section: Microstructuresupporting

confidence: 66%

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Zhao

Shi

et al. 2021

J Adv Ceram

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“…One of the main problems in fusion welding of ceramics is to control cracking because of the residual thermal stresses. The result has been to give extra heating in a more extensive region around the zone of weld so that the net thermal slope of the extra heating and the joining source is presently adequately low so that no residual thermal stresses sufficiently high to cause cracking when reached [102]. This extra heating also allows the part to be heated and cooled very slowly enough to avoid thermal shock.…”

Section: Ceramic-metal Laser Weldingmentioning

confidence: 99%

Current Issues and Problems in the Joining of Ceramic to Metal

Uday¹,

Ahmad-Fauzi²,

Noor³

et al. 2016

Joining Technologies

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Ceramics and metals are two of the oldest established classes of technologically useful materials. While metals dominate engineering applications, ceramics have some attractive properties compared to metals, which make them useful for specific applications. The properties of individual ceramics and metals can vary widely; however, the characteristics of most materials in the two classes differ significantly. Joints between a metal and ceramic are becoming increasingly important in the manufacturing of a wide variety of technological product. But joining ceramics to metallic materials often remains an unresolved or unsatisfactorily resolved problem. This chapter deals with problems of various studies in recent years on the joining between two materials.

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“…The controllable energy deposition offered by lasers is key in additive manufacturing (3,4) and could be instrumental in efficient ceramic joining. Lasers have been shown to melt ceramics (5,6); however, attempts to weld ceramics using powerful continuous-wave (CW) lasers without high-temperature preheating have been unsuccessful because of macroscopic cracking attributed to thermal shock (7)(8)(9).…”

mentioning

confidence: 99%

Ultrafast laser welding of ceramics

Penilla

Devia-Cruz

Wieg

et al. 2019

Science

124

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Welding of ceramics is a key missing component in modern manufacturing. Current methods cannot join ceramics in proximity to temperature-sensitive materials like polymers and electronic components. We introduce an ultrafast pulsed laser welding approach that relies on focusing light on interfaces to ensure an optical interaction volume in ceramics to stimulate nonlinear absorption processes, causing localized melting rather than ablation. The key is the interplay between linear and nonlinear optical properties and laser energy–material coupling. The welded ceramic assemblies hold high vacuum and have shear strengths comparable to metal-to-ceramic diffusion bonds. Laser welding can make ceramics integral components in devices for harsh environments as well as in optoelectronic and/or electronic packages needing visible-radio frequency transparency.

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WELDING OF CERAMICS SiO₂-Al₂O₃ BY LASER BEAM

Cited by 4 publications

References 1 publication

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Current Issues and Problems in the Joining of Ceramic to Metal

Ultrafast laser welding of ceramics

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