Novel Technologies for Metal Microjoining

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Welding and Joining".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 1138

Special Issue Editors

1. School of Medicine and Health, Harbin Institute of Technology, Harbin 150080, China
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150000, China
Interests: electronics packaging; microjoining; reliability; wearable technology; solder alloys; soldering; computational materials science

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Guest Editor Assistant
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
Interests: Sn-based solder; advanced electronic packaging; extreme reliability; micro joining

Special Issue Information

Dear Colleagues,

Microjoining is a critical process in microelectronic packaging, and is crucial for manufacturing many other extremely small components, devices and systems, such as medical implants, sensors and transducers, batteries, and optoelectronics. Generally, microjoining provides mechanical support, electrical connection, and environmental protection for assembly of electronic and biomedical devices. Effective microjoining has become one of the most essential technical prerequisites for success in manufacturing at ever-smaller scales. While many microjoining processes and applications become commonplace, microjoining continues to face fresh challenges because of ever advancing miniaturization.

This Special Issue aims to give an updated outlook on the application of novel microjoining technology to metals. We invite you to submit scientific manuscripts that present new findings on materials, structures, and processes in microjoing using experimental analysis, numerical simulation and intelligent algorithms. Novel findings regarding nanojoining and other bottom-up assembly techniques are also welcome, provided that the technology can be used for metals.

Dr. Rong An
Guest Editor

Dr. Xiaoliang Ji
Guest Editor Assistant

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • microjoining technology
  • microstructure
  • scale effect
  • manufacturing processes
  • reliability
  • interconnection materials
  • extreme environment

Published Papers (1 paper)

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Research

13 pages, 4048 KiB  
Article
Controlling the Amount of Copper Formate Shells Surrounding Cu Flakes via Wet Method and Thermo-Compression Sinter Bonding between Cu Finishes in Air Using Flakes
by Woo Lim Choi and Jong-Hyun Lee
Metals 2023, 13(9), 1516; https://doi.org/10.3390/met13091516 - 25 Aug 2023
Cited by 2 | Viewed by 892
Abstract
To bond a semiconductor power chip on a substrate using the formation of bondlines exhibiting long-term mechanical durability at high temperatures such as 300 °C, compression-assisted sinter bonding between Cu finishes was carried out at 300–350 °C in air. Cu flakes of approximately [...] Read more.
To bond a semiconductor power chip on a substrate using the formation of bondlines exhibiting long-term mechanical durability at high temperatures such as 300 °C, compression-assisted sinter bonding between Cu finishes was carried out at 300–350 °C in air. Cu flakes of approximately 7 µm were used as the main filler material; their surfaces were modified by pretreatment using a formic acid solution, and the existing oxide layers were transformed into copper formate shells. To increase the amount of the copper formate shells, the shell transformation reaction was controlled by the deliberate addition of 30 nm Cu2O particles and sustained for 50 min. The formate shells formed decomposed at a peak temperature of 250 °C, forming pure Cu, which rapidly induced sintering between the flakes and at the Cu-finish–flake interfaces. Therefore, the paste containing Cu flakes showed a sufficient shear strength of 26.3 MPa even in air after sinter bonding for only 3 min under 5 MPa at 350 °C. Although the bimodal-type paste presented near-full-density bondline structures within 3 min of adding 350 nm pure Cu particles, the strengths with respect to bonding time showed trends of values less than 26.3 MPa, owing to the excessive oxidation of the 350 nm Cu. Full article
(This article belongs to the Special Issue Novel Technologies for Metal Microjoining)
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