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Wide gap active brazing of ceramic-to-metal-joints for high temperature applications

Frontiers of Mechanical Engineering 2014年第1期9卷 71-74页

作者： K. Bobzin Zhao, N. Kopp S. Samadian Anavar Surface Engineering Institute RWTH Aachen University Germany

Applications like solid oxide fuel cells and sensors increasingly demand the possibility to braze ceramics to metals with a good resistance to high temperatures and oxidative atmospheres. Commonly used silver based active filler metals cannot fulfill these requirements, if application temperatures higher than 600℃ occur. Au and Pd based active fillers are too expensive for many fields of use. As one possible solution nickel based active fillers were developed. Due to the high brazing temperatures and the low ductility of nickel based filler metals, the modification of standard nickel based filler metals were necessary to meet the requirements of above mentioned applications. To reduce thermally induced stresses wide brazing gaps and the addition of A1203 and WC particles to the filler metal were applied. In this study, the microstructure of the brazed joints and the thermo-chemical reactions between filler metal, active elements and WC particles were analyzed to understand the mechanism of the so called wide gap active brazing process. With regard to the behavior in typical application oxidation and thermal cycle tests were conducted as well as tensile tests.

关键词： wide gap active brazing nickel filler metals,high temperature application WC A1203

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Effect of brazing Conditions on Microstructure and Mechanical Properties of Al_2O_3/Ti—6Al—4V Alloy Joints Reinforced by TiB Whiskers

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Journal of Materials Science & Technology 2013年第10期29卷 961-970页

作者： Minxuan Yang Peng He Tiesong Lin State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Beijing Power Machinery Research Institute

Al2O3 and Ti-6Al-4V alloy were brazed with Ag-Cu-Ti ＋B fillers in different brazing conditions. Effects of brazing temperature, holding time and additive Ti content on joints microstructure and shear strength were investigated by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, transmission electron microscopy and shear testing. Results indicate that TiCu and Ti（Cu,Al） decrease, but Ti2Cu and -Ti2（Cu,Al） increase in brazing seam with increasing brazing temperature, holding time and additive Ti content. Area consisting of Ti3（Cu,Al）30 and TiO near Al2O3 becomes gradually discontinuous from continuity when brazing temperature rises or holding time extends. As Ti additive content increases, TiO is absent near Al2O3, area consisting of only Ti3（Cu,Al）30 thickens. TiB whiskers are in situ synthesized by Ti and B atoms during brazing process. The brazing temperature, holding time and additive Ti content on joints microstructure influence the joints shear strength directly. The shear strength of joints, obtained at 850 ℃ holding for 10 min, reaches the maximum of 78 MPa. According to the experimental results, phase diagram and thermodynamics calculation, the interface evolution mechanism of the Al2O3/Ti-6Al-4V alloy joint was analyzed.

关键词： active brazing Addition of B and Ti Al2O3 Ti--6Al--4V alloy

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BEHAVIOUR OF BUFFER LAYER IN JOINING OF SIALON CERAMICS TO STEEL 40Cr

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Acta Metallurgica Sinica(English Letters) 1992年第9期5卷 201-205页

作者： XIAN Aiping SI Zhongyao Institute of Metal Research,Academia Sinica,Shenyang,China Doctoral Candidate,Laboratory of Welding and Joining,Institute of Metal Research,Academia Sinica,Shenyang 110015,China

The buffer layer material itself may be influential to the bond strength between active brazing filler and *** Ag_(57)Cu_(38)Ti_5 filler metal,Cu or Ta is excellent buffer layer material, but Kovar or Ni-15Cr-15Co is *** was important to design a layer of soft buffer,such as Cu,to relax interfacial stress rather than hard buffer layer,such as Mo,to avoid stress. There is an optimum thickness range of soft buffer layer,saying h/L=0.02—0.1. It was a good solution to the interfacial stress problem to use soft/hard buffer layer to increase metal/ceramics joint ***,an idea of designing gradual materials as buffer layer between metal and ceramics was suggested.

关键词： ceramic/metaljointing Sialon steel 40Cr active brazing interlayer

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Bonding of Al_2O_3 to Cu with Ti foil

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China Welding 1998年第1期7卷 71-77页

作者：陈铮方芳赵其章楼宏青李志章

Bonding ofAl_2O_3 to Cu is performed directly using Ti foil at temperature of 1273K. The microstructure of the joint interface is investigated through scanning electron microscope ( SEM), electron probe microanalysis ( EPMA) and X-ray diffraction (XRD). The effect of the initial Ti foil thickness on the reaction layer thickness and the joint strength are investigated.

关键词： alumina active brazing interfacial reaction joint strength transient liquid phase

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