Wettability Improvement and Brazing of Si3N4by Sputtered Al

doi:10.11900/0412.1961.2017.00026

Acta Metall Sin

2017, Vol. 53

Issue (12): 1645-1650 DOI: 10.11900/0412.1961.2017.00026

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Wettability Improvement and Brazing of Si₃N₄by Sputtered Al

Geliang LIU¹, Bingyang MA¹, Hailong SHANG^1,², Fan CHEN¹, Rongbin LI², Geyang LI¹(

)

1 State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
2 Shanghai Dianji University, Shanghai 201306, China

Cite this article:

Geliang LIU, Bingyang MA, Hailong SHANG, Fan CHEN, Rongbin LI, Geyang LI. Wettability Improvement and Brazing of Si₃N₄by Sputtered Al. Acta Metall Sin, 2017, 53(12): 1645-1650.

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Abstract

In the present technology, the brazing of Si₃N₄needs a reactive transition layers to resolve the non-wetting problem of usual metal fillers. Aluminum could wet Si₃N₄ without reaction but the brazing is very difficult due to wetting temperature above 1000 ℃. In this work, the wetting effect of sputtered Al films on Si₃N₄and its physics essence were revealed. Based on this, the brazing of Si₃N₄ ceramic with Al or Al-Ni film fillers was realized near their melting temperature. The results showed that the seams of brazing joints with direct sputtered Al on Si₃N₄ film were well-stacked and less defects, and well metallurgically bonded to ceramic without reactive transition layers. The shear strength of pure Al/Si₃N₄ joint reached 106 MPa. The strength increased to 148 MPa with adding 1.0%Ni into film filler due hypoeutectic structure in the seam. With further increasing Ni content to 3.0%, the eutectic structure of the seam slightly decreased the strength of joint to 132 MPa. These joints above all fractured in joint seams. Moreover, the Al-1.0%Ni film filler first sputtered Ni layer was compared. Its brazing joint fractured at the interface between seam and ceramic and the shear strength decreased to only 81 MPa. This comparsion revealed the "wetting" effect of the bombardment of energetic sputtered Al particles. This effect still existed after filler melting and the direct brazing of Si₃N₄ ceramic without reactive transition layers was realized.

Key words: Si₃N₄ ceramic wetting sputtered film brazing

Received: 20 January 2017

ZTFLH:

TG454

Fund: Supported by National Natural Science Foundation of China (Nos.51401120 and 51671125) and Natural Science Foundation of Shanghai (No.16ZR1412800)

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	Geliang LIU
	Bingyang MA
	Hailong SHANG
	Fan CHEN
	Rongbin LI
	Geyang LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00026 OR https://www.ams.org.cn/EN/Y2017/V53/I12/1645

Table 1 Structures and compositions of Al-based filler films, and shear strength of brazing joints of Si₃N₄

Fig.1 SEM images of brazing joints with fillers of pure Al (a), Al-1.0%Ni (b) and Al-3.0%Ni (c)

Fig.2 OM images of the shear fracture morphologies of brazing joints with fillers of pure Al (a), Al-1.0%Ni (b) and Al-3.0%Ni (c)

Fig.3 OM image of the fracture morphology of brazing joint with the structure of Si₃N₄/Ni(50 nm)/Al(7 μm) in Al-1.0%Ni film filler (sample No.2b)

Fig.4 3D OM morphologies of samples No.2 (a) and No.2b (b) after melting

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