Mechanical and heat transfer properties of AlN/Cu joints based on nanosecond laser-induced metallization

Liu, Duo; Chen, Naibin; Song, Yuchen; Song, Xiaoguo; Sun, Jie; Tan, Caiwang; Long, Weimin; Zhong, Shengwen; Jia, Lei

doi:10.1016/j.jeurceramsoc.2022.12.030

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…The results showed that the interfacial phase in region A was Al 4 Cu 9 , where the atoms were ordered along the (010) crystal plane with a crystal plane spacing of 0.882 nm. The above results were consistent with our previous conclusions [30,31] that laser-induced metallized AlN ceramic and Cu achieved metallurgical bonding through Cu-Al eutectic reaction. It is worth noting that this method can realize the joining between ceramic and Cu without additional brazing ller alloy.…”

Section: Interfacial Microstructure and Properties Of Aln/cu Jointssupporting

confidence: 93%

“…Therefore, the ceramic surface can be metallized without adding extra materials, which is conducive to subsequent combination with Cu. In our previous work [30,31], pre-treatment by laser metallization of ceramic has been demonstrated to achieve the bonding of AlN ceramic and Cu. Nonetheless, the process still needs to be improved to obtain better performance.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of AlN/Cu composite structure via laser metallization assisted direct bonding technology

Song

Chen

Wang

et al. 2023

Preprint

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In this work, an innovative and cost-effect method was proposed to fabricate AlN/Cu composite structure. The AlN ceramic was metallized by nanosecond laser irradiation without consuming extra materials. The metallurgical combination between AlN ceramic and Cu was successfully achieved based on the Al-Cu eutectic reaction at a relatively low temperature of 620 ℃. Under the laser irradiation, the AlN ceramic was thermal decomposed to form Al laeyer and microgroove. As the laser power increased, more Al was produced on the the ceramic surface and the micgroove became deeper. The microstructure, mechanical and heat transfer properties of the AlN/Cu joints were investigated. The maximum shear strength of the joint was 11.25MPa when the laser power was 56 W, and the maximum thermal conductivity was 162 W/(m·K) when the laser power was 42 W. The approach of laser-induced direct metallization of ceramics in this work provides a novel strategy for the integration of ceramics/metals composite structures.

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Section: Interfacial Microstructure and Properties Of Aln/cu Jointssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Fabrication of AlN/Cu composite structure via laser metallization assisted direct bonding technology

Song

Chen

Wang

et al. 2023

Preprint

Self Cite

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“…Laser-activated aluminum nitride ceramic metallization utilizes laser shock to form an aluminum layer on the surface of aluminum nitride, followed by chemical copper coating to prepare conductive circuits. It is a promising method of directly preparing circuits on heteromorphy devices [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Precise Analysis of the Differences in the Laser-Activated Energy Density of Aluminum Nitride Ceramics under Various Gas Bath Environments

Zhang,

Wang,

Shao

et al. 2024

Coatings

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Laser activation can lead to the formation of a layer of aluminum on the surface of aluminum nitride ceramics, thereby preparing metal circuits. Under various gas environments, there are differences in the aluminum layers precipitated by laser-activated aluminum nitride ceramics. The existing literature uses the width of the metal layer to characterize this difference, and these data are very imprecise. Usually, laser energy density is used to describe this processing difference. However, the existing concept of laser energy density is an average value and is not suitable for the threshold of laser activation, because the intensity gradient of the focused Gaussian beam is large, and different intensity distributions represent different energy levels. This article applied a precise concept of laser energy density that sees it as being proportional to light intensity and can be used to evaluate the difference in laser energy density required for the decomposition of aluminum nitride ceramics under various gas bath conditions precisely. Due to the strong energy of a focused Gaussian beam, it is not possible to directly obtain the intensity distribution. Here, the intensity distribution of the collimated beam was used to indirectly obtain the intensity distribution of the focused Gaussian beam, and the threshold values for laser activation under different gas baths were calculated. It was found that the minimum energy density in air increased by 12.5%, and the minimum energy density in nitrogen increased by 3%, using the minimum energy density required for laser activation in argon as the reference.

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“…Therefore, many researchers were also interested in methods to release residual stress in the joint. Liu et al [ 19 ] directly joined copper and AlN ceramic without a brazing alloy through laser-induced metallization of an AlN ceramic. They found that the micro-groove structures fabricated by laser irradiation significantly increased the jointing area of the joints and played the role of mechanical interlocking, which was conducive to improving the shear strength.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of “3D-rGO” Buffer Layer on the Microstructure and Properties of SiO2f/SiO2 and TC4 Brazed Joint

Liu,

Ma,

Chen

et al. 2024

Materials

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Brazing a SiO2f/SiO2 composite with metals is often faced with two problems: poor wettability with the brazing alloy and high residual stress in the joint. To overcome these problems, we report a combined method of selective etching and depositing reduced graphene oxide (rGO) on the surface of a SiO2f/SiO2 composite (3D-rGO-SiO2f/SiO2) to assist brazing with TC4. After the combined treatment, a “3D-rGO” buffer layer formed on the surface layer of the SiO2f/SiO2, and the contact angle was reduced from 130° to 38°, which meant the wettability of active brazing alloy on the surface of SiO2f/SiO2 was obviously improved. In addition, the “3D-rGO” buffer layer contributed to fully integrating the brazing alloy and SiO2f/SiO2; then, the infiltration of the brazing alloy into the surface layer of the SiO2f/SiO2 was enhanced and formed the reduced graphene oxide with a pinning structure in the three dimensional (“3D-pinning-rGO”) structure. Moreover, the joining area of the brazing alloy and SiO2f/SiO2 was expanded and the mismatch degree between the SiO2f/SiO2 and TC4 was reduced, which was achieved by the “3D-pinning-rGO” structure. Furthermore, the concentration of the residual stress in the SiO2f/SiO2-TC4 joints transferred from the SiO2f/SiO2 to the braided quartz fibers, and the residual stress reduced from 142 MPa to 85 MPa. Furthermore, the 3D-pinning-rGO layer facilitated the transfer of heat between the substrates during the brazing process. Finally, the shear strength of the SiO2f/SiO2-TC4 joints increased from 12.5 MPa to 43.7 MPa by the selective etching and depositing rGO method.

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Mechanical and heat transfer properties of AlN/Cu joints based on nanosecond laser-induced metallization

Cited by 11 publications

References 34 publications

Fabrication of AlN/Cu composite structure via laser metallization assisted direct bonding technology

Fabrication of AlN/Cu composite structure via laser metallization assisted direct bonding technology

Precise Analysis of the Differences in the Laser-Activated Energy Density of Aluminum Nitride Ceramics under Various Gas Bath Environments

Study on the Effect of “3D-rGO” Buffer Layer on the Microstructure and Properties of SiO2f/SiO2 and TC4 Brazed Joint

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