TY  - JOUR
AU  - LIU, Ting-xuan
AU  - BIAN, Jia-Li
AU  - CAO, Feng
AU  - XIA, Xu-Dong
AU  - ZHU, Tong
AU  - ZHANG, Hai-Jun
AU  - WANG, Ming-Chao
PY  - 2026
TI  - Preparation and Properties of Neodymium-Modified High-Temperature Resistant Phosphoaluminate Adhesive
JO  - Advanced Ceramics
SN  - 1005-1198
SP  - 514
EP  - 527
VL  - 47
IS  - 5
AB  - To address the drawbacks of conventional aluminum phosphate high-temperature adhesives, including mismatched thermal expansion coefficients with alumina ceramics and severe performance degradation after repeated high-low temperature thermal cycles, neodymium doping was utilized to modify and optimize the aluminum phosphate-based adhesive in this work. Systematic mechanical property tests identified the optimal molar ratio of Nd/Al as 3:7. Combined with physical property characterization, phase evolution investigation and microstructure observation, the thermal reaction and bonding mechanisms of the modified adhesive were revealed. Upon high-temperature heat treatment, massive crystallization of AlPO4 and NdPO4 occurs above 900℃, giving rise to grain boundary pinning and dispersion strengthening effects. At 1300℃, a multi-phase skeleton consisting of monoclinic NdPO4, orthorhombic AlPO4 and orthorhombic Al5BO9 is constructed, which remarkably enhances the high-temperature mechanical performance and thermal stability of the adhesive. The bonding strength of the modified adhesive sintered at 1300℃ reaches 44.5MPa, representing a 92.6% improvement compared with the unmodified sample. After 20 thermal cycles between room temperature and 1300℃, the residual bonding strength is 27.89MPa with a retention rate of approximately 68.4%, demonstrating significantly improved thermal cycling resistance. Moreover, the thermal expansion coefficient of the modified adhesive stabilizes at (7–7.5)×10-6K-1, achieving greatly improved compatibility with alumina ceramics whose thermal expansion coefficient is 8.5×10-6K-1. The as-prepared modified adhesive can meet the service requirements of aerospace and other high-temperature industries, and provides experimental foundations for the further development and application of aluminum phosphate high-temperature resistant adhesives.
UR  - https://doi.org/10.16253/j.cnki.37-1226/tq.2026.05.007
DO  - 10.16253/j.cnki.37-1226/tq.2026.05.007