Abstract
The microstructure and mechanical properties of brazing SiC ceramic with Zr-Cu filler metal under different brazing parameters (brazing temperature, holding time) were investigated. The phase of the joint reaction interface between Zr-Cu filler metal and SiC ceramic was characterized by XRD, the microstructure and fracture morphology of the brazing SiC ceramic joint were analyzed by SEM with EDS, and the strength of the joint was evaluated by compression shear test. The results show that the brazing join between SiC ceramic and Zr-Cu filler metal can be realized at the brazing temperature of 1100 °C~1300 °C, and the main products of interface reaction are ZrC and Zr2Si. The shear strength of the joint increases with the brazing temperature, and reaches the highest at 1200 °C. The thickness of interface reaction layer increases with the increase of holding time at brazing temperature of 1200 °C. Thickness of the interface reaction layer is 2.9 μm when the joint is holding for 20 min, and the maximum shear strength of the corresponding brazed SiC ceramic joint is 57 MPa.
Highlights
Silicon carbide (SiC) ceramic, as a kind of the modern ceramic materials, has a series of excellent properties, such as high-temperature resistance, corrosion resistance, high modulus and so on, which has been widely used in rocket engines, space mirrors in the aerospace field, high-temperature components for energy exchange in chemical reaction containers, etc. [1,2,3,4]
In view of the most serious damage and large amount of radioactive release caused by hydrogen explosion in Fukushima nuclear power plant accident in Japan, SiC ceramic matrix fuel cladding materials can reduce the risk of hydrogen production by several thousand times, and provide similar protection for nuclear fuel with zirconium alloy, indicating that SiC ceramic have advanced application potential in the field of nuclear energy, which was tested by professor Kazimi team from Massachusetts Institute of Technology (MIT) [5,6]
The commonly used filler metals for brazing SiC ceramic are Ag-based [11,12,13], Ti-based [14,15], Ni-based [16,17], etc.; the above brazed joint cannot meet the requirements of high-temperature mechanical properties and a small thermal neutron absorption cross-section nuclear performance at the same
Summary
Silicon carbide (SiC) ceramic, as a kind of the modern ceramic materials, has a series of excellent properties, such as high-temperature resistance, corrosion resistance, high modulus and so on, which has been widely used in rocket engines, space mirrors in the aerospace field, high-temperature components for energy exchange in chemical reaction containers, etc. [1,2,3,4]. Silicon carbide (SiC) ceramic, as a kind of the modern ceramic materials, has a series of excellent properties, such as high-temperature resistance, corrosion resistance, high modulus and so on, which has been widely used in rocket engines, space mirrors in the aerospace field, high-temperature components for energy exchange in chemical reaction containers, etc. Compared with the above joining methods, the temperature of brazing is lower and the mechanical properties of the joint is better, so brazing is the most possible method to realize SiC ceramic joining. The commonly used filler metals for brazing SiC ceramic are Ag-based [11,12,13], Ti-based [14,15], Ni-based [16,17], etc.; the above brazed joint cannot meet the requirements of high-temperature mechanical properties and a small thermal neutron absorption cross-section nuclear performance at the same
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