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The poor wettability between the ceramic reinforcements and the metal matrix makes it difficult to realize the densification process of composites, which is severely detrimental to their mechanical properties. To improve the mechanical properties of Al matrix composites (AMCs) reinforced by β-Si 3 N 4  whiskers (β-Si 3 N 4 w), we prepare TiN coating on the surface of β-Si 3 N 4 w via molten salt process, remarkably strengthening the interface bonding between Al matrix and β-Si 3 N 4 w. By optimizing the coating layer thickness, the bending strength of AMCs reinforced by TiN-coated β-Si 3 N 4 w reaches 439 MPa at 850°C, exhibiting remarkable enhancement relative to the composites without TiN coating (335MPa). Meanwhile, the interfacial test shows that TiN-coated β-Si 3 N 4 w is well bonded with the Al matrix, and no interfacial defects were detected. Moreover, the TiN coating with appropriate thickness can efficiently alleviate the agglomeration of β-Si 3 N 4 w, promote the densification of AMCs, and modify the Al/β-Si 3 N 4 w interface.

Microstructure and mechanical properties of Al matrix composites reinforced by TiN-coated β-Si 3 N 4 whiskers