研究目的
Investigating the joinability of Zircaloy-SiC/SiC composite tube joints under different laser conditions and slit shapes for the development of end-cap seals for SiC/SiC composite cladding in light-water reactors.
研究成果
The mechanical caulking joint of zircaloy and SiC/SiC composite tubes was successfully produced, but the airtightness was insufficient for the end-cap of SiC/SiC composite cladding. The flat cutting with hook slit is considered the best method for holding titanium powder during laser irradiation, suggesting potential for uniform solid solution along the circumferential direction with narrower slit width.
研究不足
The airtightness of the caulking joint was insufficient for the end-cap of SiC/SiC composite cladding. The width of the slit and laser irradiation line needs optimization for better joinability.
1：Experimental Design and Method Selection:
The caulking method was employed for sealing the end cap of SiC/SiC composite tube by zircaloy tube with titanium micro-powder inserted between them. Diode or fiber laser was used for circumferential irradiation on the outer surface of zircaloy tube.
2：Sample Selection and Data Sources:
NITE SiC/SiC composite and Zircaloy-2 tubes were used. The outer & inner diameters were 12.0 & 10.0 mm and about 12.3 & 10.6 mm, respectively.
3：0 & 0 mm and about 3 & 6 mm, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Diode and fiber lasers with maximum power of 500 W, titanium micro-powder, and rotational apparatus for tube rotation during laser irradiation.
4：Experimental Procedures and Operational Workflow:
The laser was irradiated on the outer surface of zircaloy tube while rotating the tubes. The insert method of titanium powder was varied by changing the cutting method of SiC/SiC composite tube.
5：Data Analysis Methods:
The airtightness was evaluated through visual examination of bubbles in a simple bubble leak test. SEM and EDS were used for analyzing the joint interfaces.
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