Abstract
In this paper, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD) were used to comprehensively analyze the microstructure and brazing performance of a CuAgTi filler metal with braze tungsten heavy alloys. The association of microstructure, wettability and shear strength of brazing joints was also investigated. With the addition of Ti, the Ti3Cu4 phase appeared in the microstructure of filler metal. Ti is active element that promotes the reaction of filler with tungsten. Therefore, the Ti element is enriched around tungsten and forms a Ti2Cu layer at the interface, leaving a Cu-rich/Ti-poor area on the side. Remaining Ti and Cu elements form the acicular Ti3Cu4 structure at the center of the brazing zone. The wettability of filler metal is improved, and the spreading area is increased from 120.3 mm2 to 320.9 mm2 with the addition of 10 wt.% Ti. The shear strength of joint reaches the highest level at a Ti content of 2.5 wt.%, the highest shear strength is 245.6 MPa at room temperature and 142.2 MPa at 400 °C.
Highlights
Tungsten heavy alloys are composite materials while W is used as the hard phase and (Ni, Cu), (Ni, Fe) are used as the binder phases [1,2]
In order to solve the two problems of controlling brazing temperature and intermetallic joint strength reduction caused by intermetallic compounds in the brazing of tungsten-based powder compound joint strength reduction caused by intermetallic compounds in the brazing of alloy, we chose Cu-30Ag as a base filler metal and added the Ti element to promote its interaction with tungsten-based powder alloy, we chose Cu-30Ag as a base filler metal and added the Ti element to base metal, studied the influence of Ti on solder microstructure, joint structure and mechanical promote its interaction with base metal, studied the influence of Ti on solder microstructure, properties, concluding as follows
The Ti element influences the microstructure of the filler metal
Summary
Tungsten heavy alloys are composite materials while W is used as the hard phase and (Ni, Cu), (Ni, Fe) are used as the binder phases [1,2]. High temperature brazing seems to be the most suitable method because of its limited influence on properties of base materials. In order to braze tungsten alloy, various components of filler metals have been investigated, such as Fe-based filler metals [12,13], Ni-based filler metals [14,15] and Cu-based filler metals [16,17]. Researchers have tried to to extend of Ti Chiachen to braze ofLin tungsten alloys. W into filler metal causes an brazed joint by Ti foilsThe is full of voids/cracks. Content to further studied the and influence of Ti on the microstructure and mechanical of the and provide a basis optimizing the filler composition. Ti content to provide a basis for optimizing the filler composition
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