Laser surface nanostructuring for reliable Si3N4/Si3N4 and Si3N4/Invar joined components

Salvo, Milena; Casalegno, Valentina; Suess, Manuela; Gozzelino, Laura; Wilhelmi, Christian

doi:10.1016/j.ceramint.2018.03.226

Cited by 15 publications

(2 citation statements)

References 17 publications

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“…Invar possesses a uniquely low coefficient of thermal expansion (CTE, α 25-100°C ≈ 1.5 × 10 −6 /°C) below its Curie temperature (T c ~ 277 °C) [1]. For this reason, Invar alloys are frequently used in a wide range of applications that require highdimensional stability, such as large telescopes, precision instruments, and core wires of long-distance power cable [2]. In recent years, Invar alloys with high mechanical strength have been subject to renewed interest for their application in aeronautic and aerospace industry, such as high-tolerance curing molds for composite materials and ultrahigh-stability structures for in-orbit and groundand-orbit multi-satellite operations [3,4].…”

Section: Introductionmentioning

confidence: 99%

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

et al. 2019

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Invar is a solid solution alloy that offers high-dimensional stability. It is challenging for traditional methods to strengthen Invar alloys without a significant increase in the coefficient of thermal expansion (CTE). In this work, WC nanoparticlereinforced Invar nanocomposite was manufactured. The microstructures, mechanical properties, and thermal expansion behavior were investigated. It was found that the Invar alloy was effectively strengthened by WC nanoparticle reinforcement without significant elevation of its CTE. The Invar-WC nanocomposite exhibits an enhanced yield and tensile strength of 440 and 795 MPa, an increase of 60% and 77% from commercial Invar alloy, and a moderate ductility of 22.7% in annealed state. In cold-rolled state, The Invar-WC nanocomposite exhibits a high tensile strength of 1050 MPa, an increase of 46% from commercial Invar alloy, while retaining 4.5% ductility. A record low CTE value of 2.61 × 10 −6 /°C and an enhanced Young's modulus of 185 GPa, up from 140 GPa, were also achieved. It was found that WC leads to a lower CTE at higher temperature compared to unreinforced Invar.

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Section: Introductionmentioning

confidence: 99%

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

et al. 2019

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“…Compared with transient liquid phase bonding, diffusion bonding, etc., vacuum brazing is advanced in simplicity, lower cost and high quality [15,16]. Si 3 N 4 ceramic is one of the most widely used ceramics in the thermal machine, heat exchangers, wear resistant elements and wave-transparent materials due to its excellent properties, such as light weight, high resistance to thermal shock, excellent creep resistance and wear properties [17][18][19]. When used as wave-transparent materials in antenna radomes, it would be brazed to a TiAl intermetallics holder.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal

Dong

Zhu

Wang

et al. 2018

Metals

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Vacuum brazing of TiAl intermetallic alloy to Si3N4 ceramics was performed using Ag-28Cu (wt.%) filler alloy. The brazing joints obtained at different brazing temperatures were studied in this work. The microstructure and the shear strength were analyzed in detail. The results show that the brazed joints could be divided into three regions: AlCu2Ti reaction layer near the Ti-48Al-2Cr-2Nb alloy, a typical Ag-Cu eutectic structure and a thin continuous TiN + Ti5Si3 reaction layer near the Si3N4 ceramics. The microstructure varied as the brazing temperature was increased from 1153 K/15 min to 1193 K/15 min. The shear strength of the joints first increased as the brazing temperature increased from 1153 K to 1173 K, and then decreased. The maximum shear strength reached 105.5 MPa at 1173 K/15 min and the mechanism was discussed.

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Microstructure and Mechanical Properties of the Joint between Si₃N₄ and Mo Brazed by Near‐Eutectic Ag–Cu–In–Ti Filler Alloy

Zhao,

Mo,

Shi

et al. 2023

Adv Eng Mater

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The joining of Si3N4 and Mo using Ag–Cu–In–Ti active filler alloy with the brazing temperature ranging from 720 to 860 °C for 10 min is investigated in this article. The correlation between the joint strength and the microstructures of the brazed joints is discussed. In the results, it is shown that the activity of Ti is different at different temperatures, and thus the degree of diffusion of Ti to the interface is different. The activity of Ti gradually increases as the brazing temperature increases, and more Ti atoms diffuse into both sides of the base materials, resulting in a progressively thicker TiN + Ti5Si3 reaction layer on the Si3N4 ceramic side. Between 720 and 860 °C, the shear strength of the joint first increases and then decreases with brazing temperature. The maximum shear strength (223 MPa) is obtained at 830 °C.

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Laser surface nanostructuring for reliable Si3N4/Si3N4 and Si3N4/Invar joined components

Cited by 15 publications

References 17 publications

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal

Microstructure and Mechanical Properties of the Joint between Si₃N₄ and Mo Brazed by Near‐Eutectic Ag–Cu–In–Ti Filler Alloy

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Laser surface nanostructuring for reliable Si3N4/Si3N4 and Si3N4/Invar joined components

Cited by 15 publications

References 17 publications

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

Fe–Ni Invar alloy reinforced by WC nanoparticles with high strength and low thermal expansion

Microstructure and Shear Strength of Brazing TiAl/Si3N4 Joints with Ag-Cu Binary Alloy as Filler Metal

Microstructure and Mechanical Properties of the Joint between Si3N4 and Mo Brazed by Near‐Eutectic Ag–Cu–In–Ti Filler Alloy

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Microstructure and Mechanical Properties of the Joint between Si₃N₄ and Mo Brazed by Near‐Eutectic Ag–Cu–In–Ti Filler Alloy