Partial transient liquid phase bonding of carbon/carbon composites using Ti–Ni–Al2O3–Si compound as interlayer

Partial transient liquid phase (PTLP) bonding has been successfully developed to join carbon/carbon (C/C) composites using Ti–Ni–Al2O3–Si compound as interlayer. Gradient interface and core interlayer were formed in the C/C joints by element diffusions, chemical reactions and hot-press sintering. Partial liquid phase infiltrated into C/C matrix and formed ‘nail effect’, which was favorable to improve the mechanical properties of C/C joints. Shear strength and thermal shock resistance of the joints were investigated. The results indicated that the average joint shear strength reached 21.30 MPa at room temperature (RT) and nearly did not reduce up to 1273 K. The shear strength decreased slowly with increasing thermal cycles from RT to 1373 K. After 30 thermal cycles, the strength retention ratio still achieved 73.10%. The excellent thermal shock resistance and high strength retention up to 1373 K make the joints to be potentially used in a broad temperature ranging from RT to 1373 K.

► PTLP bonding technique has been successfully developed to join C/C composites.
► Reliable C/C joints were dependent on gradient interface and a ‘nail effect’.
► The joints are promising materials due to high strength retention below 1373 K.
► The joints have good thermal shock resistance from room temperature to 1373 K.