Investigation of microstructure and mechanical properties of diffusion brazed boron carbide ceramics with Ni–Cr-Si-Fe-B-C filler alloy

IF 2.5 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
A. Amirnasiri, S. E. Mirsalehi
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引用次数: 0

Abstract

This study investigates the mechanical properties and microstructure of boron carbide ceramic joints with Ni–Cr-Si-Fe-B-C filler, using vacuum diffusion brazing at temperatures from 1363 to 1423 K. The results of shear strength tests showed a 43.8% increase (from 39.44 to 56.73 MPa) as the temperature rose from 1363 to 1383 K, a 22.8% increase (from 56.73 to 69.56 MPa) from 1383 to 1403 K, and a 10.9% decrease (from 69.56 to 61.92 MPa) from 1403 to 1423 K. The sample brazed at 1403 K for 30 min showed the highest shear strength of 69.56 MPa. This increased strength is due to the higher fluidity of the molten filler alloy and enhanced interactions in the ceramic–metal system at elevated temperatures. The joint interface, interfacial phenomena, fracture surface, hardness, microstructure, and phases in different samples were analyzed. Fractography results indicate that shear strengths correlate with the ratio of removed areas from the ceramic on the fracture surface. The boron carbide part exhibited a mixed mode of brittle fracture. Successful joining and good strength at low temperatures are attributed to compounds like Fe2B, SiC, and Ni4B3. Higher temperature samples showed stronger peaks of these compounds and chromium borides, contributing to the higher strength observed. The study also reveals consistent results in the diffusion pattern of elements, elemental analyses, hardness values, and phases formed at the fracture surface.

Abstract Image

Ni-Cr-Si-Fe-B-C填充合金扩散钎焊碳化硼陶瓷的显微组织和力学性能研究
研究了Ni-Cr-Si-Fe-B-C钎料在1363 ~ 1423 K真空扩散钎焊下碳化硼陶瓷接头的力学性能和显微组织。抗剪强度试验结果表明,当温度从1363 ~ 1383 K升高时,抗剪强度增加43.8%(从39.44到56.73 MPa),当温度从1383 ~ 1403 K升高22.8%(从56.73到69.56 MPa),当温度从1403 ~ 1423 K降低10.9%(从69.56到61.92 MPa)。在1403 K下钎焊30min,试样的抗剪强度最高,达到69.56 MPa。这种强度的增加是由于熔融填充合金的流动性更高,以及陶瓷-金属系统在高温下的相互作用增强。分析了不同试样的接头界面、界面现象、断口形貌、硬度、显微组织和物相。断口分析结果表明,抗剪强度与断口表面陶瓷去除面积的比例有关。碳化硼部分呈现脆性断裂的混合模式。Fe2B、SiC和Ni4B3等化合物的加入使合金在低温下连接成功并具有良好的强度。温度较高的样品显示出这些化合物和硼化铬更强的峰,有助于观察到更高的强度。研究还揭示了元素的扩散模式、元素分析、硬度值和断口形成的相的一致结果。
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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