Abstract
In this work, we have attempted to develop the Ag-Cu-Ti filler for bonding ZrO2 to Ti-6Al-4V. The CeO2 nanoparticles were reinforced in the eutectic Ag-Cu-Ti filler via mechanical mixing and melting route. Furthermore, the brazeability, microstructure, and mechanical behavior, as well as brazing performance of the ZrO2/Ti-6Al-4V joints, were assessed. The wettability of the Ag-Cu-Ti matrix was increased from 89 to 98% on Ti-6Al-4V and from 83 to 89% on the ZrO2 substrate after the addition of 0.05% CeO2. Also, there was a depression in the melting point of the composite fillers up to 3°C. The microstructure consists of Cu- and Ag-rich phases and Cu-Ti intermetallic compounds (IMCs). The joint shear strength was improved with the addition of CeO2 up to 0.05 wt.% in the matrix. It was inferred that, for an excellent brazing performance of the ZrO2/Ti-6Al-4V joint, the optimum amount of CeO2 should be 0.05 wt.% in the Ag-Cu-Ti matrix.
Highlights
Bonding of ceramic materials to metals is a recent hot topic in various engineering applications, including heat exchangers, connectors, capacitors, thermoelectrics, solar cells, and complex structural joints [1, 2]
If we inspect previous literatures, we see two major issues that are needed to be minimized in ceramic brazing, such as wetting of the contact surfaces and the stress development caused by the mismatch in mechanical and thermal properties of two contact materials that depend on the deformation characteristics of the filler used [1,2,3,4,5]
Rare earth oxide, CeO2, has been used frequently for low temperature joining of electronic devices as well as in multiple applications such as photonics, energy storage devices, sensing, and power electronics. In view of these merits, we have chosen CeO2 nanoparticles produced via solution combustion method to reinforce the Ag-Cu-Ti matrix and apply for brazing of ZrO2 and Ti-6Al-4V plates in the lap-joint configuration. e microstructural, mechanical, and thermal properties of the composite fillers were studied. e effect of various fractions of CeO2 (x 0, 0.03, 0.05, and 0.1 wt%) in the Ag-Cu-Ti matrix was studied for microstructure, wetting and brazed joint ZrO2, and Ti-6Al-4V strength
Summary
Bonding of ceramic materials to metals is a recent hot topic in various engineering applications, including heat exchangers, connectors, capacitors, thermoelectrics, solar cells, and complex structural joints [1, 2]. It is always a practical challenge to bond these ceramic materials directly due to a wide difference in physicochemical and mechanical properties of ceramics and metals that imposes a great challenge in microjoining operations [2] For this purpose, various popular brazing fillers are already developed where the most popular ones are eutectic Ag-Cu or Ag-Cu-Ti alloys as reported in the past [3, 4]. In ceramic brazing, limited studies exist on nanocomposite-based brazing fillers [24,25,26] Among these nanoreinforcements, rare earth oxide, CeO2, has been used frequently for low temperature joining of electronic devices as well as in multiple applications such as photonics, energy storage devices, sensing, and power electronics. In view of these merits, we have chosen CeO2 nanoparticles produced via solution combustion method to reinforce the Ag-Cu-Ti matrix and apply for brazing of ZrO2 and Ti-6Al-4V plates in the lap-joint configuration. e microstructural, mechanical, and thermal properties of the composite fillers were studied. e effect of various fractions of CeO2 (x 0, 0.03, 0.05, and 0.1 wt%) in the Ag-Cu-Ti matrix was studied for microstructure, wetting and brazed joint ZrO2, and Ti-6Al-4V strength
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