High-strength Diffusion Bonding of Carbon/Carbon Composites Based on Si-CaO/Al2O3-Si Sandwich Structure
WANG Xiaoyu1, JIA Jiangang1,2,*, LIU Diqiang3, JU Jiakang1, CHAI Changsheng4, JI Genshun1
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 3 Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 4 Gansu Haoshi Carbon Fiber Co., Ltd., Lanzhou 730000, China
Abstract: Asandwich structure layer is formed by sequentially laying Si, CaO/Al2O3 glass-ceramics (referred to as CA) and Si slurry coatings on the surface of the carbon/carbon (referred to as C/C) composites. Joining of the C/C composites to itself is realized by hot press diffusion bonding. The wettability between C/C composites and glass-ceramics is poor, whereas Si and C have a good affinity. It is thus expected that SiC is generated through in-situ reaction between Si and C matrix under high temperature, while Si and CA undergo mutual diffusion and chemical reaction to form silicate glass. By this means, glass-ceramics can be used to join C/C composites. The microstructure and mechanical properties of the joints were studied. Results show that the cracks and holes on the joint connecting layer are reduced and the connecting layer becomes denser with the extension of the heat preservation time. Under the conditions of 1 480 ℃, 0.5—1 MPa and holding time of 90 min, the shear strength of the resulting joint at room temperature reaches 30.45 MPa. The molten interlayer product has good wettability with the C/C composites, and penetrates the voids of the C/C composites matrix to form a ‘pinning structure’, thereby improving the shear strength of the joints.
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2022, Vol. 36 
