Brazing of Porous Nickel to Copper and Stainless Steel: Microstructure and Mechanical Properties

Key Engineering Materials Pub Date : 2024-07-03 DOI:10.4028/p-Zo5w4D

T. Zaharinie, Muhammad Amirul Ikmal, Ramizah Rozaimay, Tadashi Ariga

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Abstract

A porous nickel (Ni) was brazed to copper (Cu) and stainless steel 304 (SS304) using VZ2250 and MBF67 brazing filler metal with a composition of 77.4Cu-9.3Sn-7.0Ni-6.3P and 64.5Ni-25Cr-6P-1.5Si (Cu: Copper, Sn: Tin, Ni: Nickel, P: Phosphorus, Cr: Chromium, Si: Silicon), respectively for joint microstructure and mechanical properties analysis. Porous Ni with a pore density of 15 pores per inch (PPI) was sandwiched between Cu/VZ2250 and MBF67/SS304. A brazed joint of Cu/Porous Ni/SS304 with VZ2250 and MBF67 brazing filler metal was prepared in a high vacuum furnace at different brazing times of 5, 10, and 15 minutes for 1015 °C with a heating and cooling rate of 10 °C/min, respectively for comparison purpose. The microstructure and mechanical properties of the brazed joint were investigated to identify the joint ability after the brazing process. Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-Ray Spectroscopy (EDS) confirmed the interfacial microstructure by the formation of the diffusion filler metal (dark grey colour) for the Cu/Porous Ni/SS304 with VZ2250 and MBF67 brazing filler metal. For shear strength tests, the value decreases with an increase in the brazing time. The shear strength tests for the brazed joint of Cu/Porous Ni/SS304 with VZ2250 and MBF67 brazing filler metal show the maximum shear strength test value can be achieved for the brazing time of 5 minutes. The decreasing shear strength value was observed with differences in structural data of porous Ni due to the softening after the brazing process. Keywords: Brazing, Microstructure, Porous Nickel, Shear Strength.

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多孔镍与铜和不锈钢的钎焊：微观结构和机械性能

使用 VZ2250 和 MBF67 铜焊填料金属将多孔镍（Ni）钎焊到铜（Cu）和不锈钢 304（SS304）上，其成分分别为 77.4Cu-9.3Sn-7.0Ni-6.3P 和 64.5Ni-25Cr-6P-1.5Si（Cu：铜；Sn：锡；Ni：镍；P：磷；Cr：铬；Si：硅），以分析接头的微观结构和机械性能。在 Cu/VZ2250 和 MBF67/SS304 之间夹入了孔密度为每英寸 15 个孔 (PPI) 的多孔镍。为了进行比较，在高真空炉中用 VZ2250 和 MBF67 钎料金属制备了铜/多孔镍/SS304 的钎焊接头，钎焊时间分别为 5 分钟、10 分钟和 15 分钟，温度为 1015 ℃，加热和冷却速度均为 10 ℃/分钟。对钎焊接头的微观结构和机械性能进行了研究，以确定钎焊工艺后的接头能力。配备了能量色散 X 射线光谱仪（EDS）的扫描电子显微镜（SEM）通过 VZ2250 和 MBF67 钎焊填充金属在铜/多孔镍/SS304 中形成的扩散填充金属（深灰色）确认了界面微观结构。在剪切强度测试中，该值随着钎焊时间的延长而降低。使用 VZ2250 和 MBF67 钎料的铜/多孔镍/SS304 钎焊接头的剪切强度测试表明，钎焊时间为 5 分钟时，剪切强度测试值最大。由于钎焊过程后多孔镍发生软化，剪切强度值随多孔镍结构数据的不同而降低。关键词钎焊显微结构多孔镍剪切强度

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来源期刊

Key Engineering Materials

CiteScore

1.00

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0.00%

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