Correlation between microstructure and mechanical properties of active brazed C_f/SiC composite joints using Ti-Zr-Be

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• 作者：Dongyu Fan ; Jihua Huang ; ^{jhhuang62@sina.com" class="auth_mail" title="E-mail the corresponding author} ; Xiaowei Sun ; Jian Yang ; Shuhai Chen ; Xingke Zhao
• 关键词：Cf/SiC composite ; Ti-Zr-Be alloy ; Microstructure ; Mechanical properties
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：14 June 2016
• 年：2016
• 卷：667
• 期：Complete
• 页码：332-339
• 全文大小：4984 K

文摘

C_f/SiC composites were successfully active brazed by Ti-Zr-Be filler foil. The microstructure of the brazed joints was investigated by auger electron spectroscopy (AES) and scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS). The phase structure was determined by X-ray diffraction (XRD). The mechanical property was measured by mechanical testing machine. The results indicate that the brazed joint consisted of TiC, Ti₃SiC₂, ZrC, Be₂C, Be₁₇Ti₂ and Ti-based solid solution (β-Ti). TiC+Ti₃SiC₂/ZrC+Ti(Zr)-Si-C+Be₂C reaction layers were formed near C_f/SiC composite side while the reaction layer of β-Ti+Be₁₇Ti₂+Ti(Zr)₃SiC₂ with a small amount of ZrC, TiSi₂, Be₂C particles was formed in the center of the joint. With the increase of the brazing temperature or holding time, the amount of β-Ti compound in the interlayer decreased gradually while the thickness of reaction layer increased gradually. When the brazing temperature was 1000 °C and the holding time was 15 min, the maximum room temperature shear strength of the brazed joint can be achieved, which was 136.63 MPa. The joints with the parameters of 950 °C/30 min, 1000 °C/15 min and 1050 °C/5 min could resist a pressure of 5 MPa at 1200 °C for 5 min