Abstract
Active brazing of zirconia with metallic alloys is a promising method for enhancing the mechanical property of zirconia. However, the brazing process of zirconia and metallic alloys has not been studied in detail because of a limitation in selection of materials and processing conditions. Here, we successfully brazed zirconia with Ti-3Al-2.5V alloy using amorphous Zr54Ti22Ni16Cu8 active filler alloy. By manipulating the brazing temperature from 800 °C to 860 °C, a highest strength of ~186 MPa was achieved at 860 °C. Reduced brittle (Zr,Ti)2(Ni,Cu) intermetallic phases from formation of island-type (Zr,Ti) matrix, ZrO2-X, TiO, and TiO2 interlayer play a key role in increasing the joint strength. Our findings will be helpful in developing brazing processes for zirconia and metallic alloys.
Highlights
Zirconia is a very attractive ceramic material because of its high mechanical strength, fracture toughness, corrosion resistance, and biomedical suitability [1]
Interface microstructures brazed at different temperatures were investigated
By investigating the effects of the brazing temperature on the interface microstructure and mechanical investigating the effects of the brazing temperature on the interface microstructure and mechanical strength of the joints, the relationship between the highest ~186 MPa shear strength of the joints and the strength of the joints, the relationship between the highest ~186 MPa shear strength of the joints and microstructure phases brazed at 860 ◦ C was demonstrated
Summary
Zirconia is a very attractive ceramic material because of its high mechanical strength, fracture toughness, corrosion resistance, and biomedical suitability [1]. Despite such excellent advantages, the brittleness of zirconia makes it difficult to fabricate specific shapes or designs for industrial applications. Among the candidate materials, joining of zirconia with Ti-Al-V metallic alloys is considered an attractive method owing to the potential aerospace applications deriving from the high specific strength and good corrosion resistance of Ti-Al-V alloys [2]. Brazing using active filler metal is a promising candidate process for heterogeneous ceramic-metal joining, including zirconia and Ti-Al-V alloy joining [5,6,7]. Amorphous Zr-Ti-Ni-Cu alloys are emerging as alternative filler metals for the joining of zirconia and
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