The Evolution of a Ternary Ag-Cu-Zr Active Braze Filler Metal for Kovar™/Alumina Braze Joints

被引：0

作者：

Stephens, J. J. ^{[1
]}

Hosking, F. M. ^{[1
]}

Walker, C. A. ^{[1
]}

Dudley, E. C. ^{[1
]}

Yost, F. G. ^{[2
]}

机构：

[1] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

[2] Trapezium Technol, Albuquerque, NM 87112 USA

来源：

BRAZING AND SOLDERING, PROCEEDINGS | 2006年

关键词：

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper will chronicle the "evolution" of a practical Ag-1Cu-2Zr active braze filler metal for use in hermetic Kovar (TM)/Alumina braze joints. The alloy possesses the following important attributes relevant to metal/ceramic brazing: (a) it forms hermetic braze joints between 94% alumina ceramic and the Fe-29Ni-17Co controlled expansion alloy (known commercially as Kovar (TM)), (b) ASTM F19 tensile button strength for such braze joints are generally quite high, along with a large number of bulk ceramic fractures, and (c) high temperature mechanical properties of this braze alloy indicate good capacity for relaxation of mismatch strains in Kovar (TM)/alumina ceramic braze joints. Two alloys that served as intermediate milestones on the way to the 97Ag-1Cu-2Zr composition, are discussed. The earliest alloy considered was a 70Ag-28Cu-2Zr alloy - essentially eutectic Ag-Cu with a 2 wt.% Zr addition. The second stop on the way was a 98Ag-2Zr binary alloy. Excessive runout of the binary 98Ag-2Zr alloy on larger Kovar (TM) flanges led to the 97Ag-1Cu-2Zr alloy. Filler metals containing the Cu4AgZr intermetallic compound were found difficult to braze, and resulted in low hermetic yields.

引用

页码：207 / +

页数：2

共 9 条

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