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The high-quality joint between SiO2f/SiO2 and Nb was achieved by regulating the surface structure of SiO2f/SiO2. The fused silica as fillers in SiO2f/SiO2 surface layer was consumed by etching treatment, and quartz fibers braided in two dimensions were left. By etching treatment, the wettability of SiO2f/SiO2 was improved and the contact angle dropped from 138° to 37°. Furthermore, the surface structure...
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