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Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air
Hypereutectic Al-Si alloys are attractive materials in the fields of electronic packaging and aerospace. A Bi(2)O(3)-ZnO-B(2)O(3) system lead-free brazing filler glass was employed to braze hypereutectic Al-50Si alloys in air. The hypereutectic Al-50Si alloys were pre-oxidized and the low-temperatur...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7764188/ https://www.ncbi.nlm.nih.gov/pubmed/33322423 http://dx.doi.org/10.3390/ma13245658 |
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author | Wang, Zhenjiang Gao, Zeng Ba, Xianli Chu, Junlong He, Peng Niu, Jitai |
author_facet | Wang, Zhenjiang Gao, Zeng Ba, Xianli Chu, Junlong He, Peng Niu, Jitai |
author_sort | Wang, Zhenjiang |
collection | PubMed |
description | Hypereutectic Al-Si alloys are attractive materials in the fields of electronic packaging and aerospace. A Bi(2)O(3)-ZnO-B(2)O(3) system lead-free brazing filler glass was employed to braze hypereutectic Al-50Si alloys in air. The hypereutectic Al-50Si alloys were pre-oxidized and the low-temperature glass powder was flake-shaped in the brazing process. The effects of brazing temperature and time on joints microstructure evolution, resulting mechanical strength, and air tightness were systematically investigated. The results indicated that the maximum shear strength of the joint was 34.49 MPa and leakage rate was 1.0 × 10(−10) Pa m(3)/s at a temperature of 495 °C for 30 min. Crystalline phases, including Bi(24)B(2)O(39) and Bi(2)O(3), were generated in the glass joint. The formation of a diffusion transition layer with a thickness of 3 μm, including elements of Al, Si, Zn, Bi, Na, and B, was the key to form an effective joint. The elements of Al, Si, and Bi had a short diffusion distance while the elements of Zn, Na, and B diffused in a long way under brazing condition. |
format | Online Article Text |
id | pubmed-7764188 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-77641882020-12-27 Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air Wang, Zhenjiang Gao, Zeng Ba, Xianli Chu, Junlong He, Peng Niu, Jitai Materials (Basel) Article Hypereutectic Al-Si alloys are attractive materials in the fields of electronic packaging and aerospace. A Bi(2)O(3)-ZnO-B(2)O(3) system lead-free brazing filler glass was employed to braze hypereutectic Al-50Si alloys in air. The hypereutectic Al-50Si alloys were pre-oxidized and the low-temperature glass powder was flake-shaped in the brazing process. The effects of brazing temperature and time on joints microstructure evolution, resulting mechanical strength, and air tightness were systematically investigated. The results indicated that the maximum shear strength of the joint was 34.49 MPa and leakage rate was 1.0 × 10(−10) Pa m(3)/s at a temperature of 495 °C for 30 min. Crystalline phases, including Bi(24)B(2)O(39) and Bi(2)O(3), were generated in the glass joint. The formation of a diffusion transition layer with a thickness of 3 μm, including elements of Al, Si, Zn, Bi, Na, and B, was the key to form an effective joint. The elements of Al, Si, and Bi had a short diffusion distance while the elements of Zn, Na, and B diffused in a long way under brazing condition. MDPI 2020-12-11 /pmc/articles/PMC7764188/ /pubmed/33322423 http://dx.doi.org/10.3390/ma13245658 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Zhenjiang Gao, Zeng Ba, Xianli Chu, Junlong He, Peng Niu, Jitai Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air |
title | Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air |
title_full | Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air |
title_fullStr | Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air |
title_full_unstemmed | Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air |
title_short | Joining of Hypereutectic Al-50Si Alloys Using Lead-Free Brazing Filler Glass in Air |
title_sort | joining of hypereutectic al-50si alloys using lead-free brazing filler glass in air |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7764188/ https://www.ncbi.nlm.nih.gov/pubmed/33322423 http://dx.doi.org/10.3390/ma13245658 |
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