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Abstract The lower-strength defect of inorganic phosphate adhesive had been definitely improved by self-generating multiple high-temperature resistant phases. Compared to our previous product, the best bonding performance of this novel adhesive for mullite was increased by 270%, which was close to some popular preceramic polymer-based adhesives. The apparent shear strength at room temperature was up to 33.1 MPa after calcination at 900 °C, while the high-temperature strength researched 23.3 MPa at 900 °C and maintained above 17 MPa from 700° to 1200 °C. The reinforced effect of adhesive owed to the introduction of various Cu-based intermetallics, the premature generation of Al 4 B 2 O 18 at 900 °C, and the structure optimizing through the oxidization of Si and B 4 C. Besides, the novel adhesive displayed good resistance to thermal-shock, especially for air-cooling test. After 15 thermal cycles in air, the residual strength of 1300 °C-calcined joints was still above 13 MPa (~40%). [ABSTRACT FROM AUTHOR]