Modification of ZTA particles with Ni coating by electroless deposition

Abstract

The modification of ZTA particles with Ni coating as reinforcement is systematically clarified to enhance the wearability of Ni-encapsulated ZTA (ZTA@Ni)-reinforced high-chromium cast iron (HCCI) matrix composites. Continuous and uniform metallic Ni coatings are formed on ZTA surface by electroless deposition with ChCl-EG ionic liquid as additive. The coating thickness can be controlled by regulating deposition times and the ZTA@Ni particles with 24.35 μm are chosen as reinforced phase in HCCI matrix composites. Results show that Ni atoms can be permeated into matrix during the casting process leading to the formation of diffusive nucleus to refine the particle size of carbides adjacent interface. A good combination between ZTA@Ni particles and HCCI matrix is observed in the composites. The dissolution and diffusion of metallic Ni can greatly reinforce the interfacial bonding strength to constitute a compact combination of the metallic phase and hard phase.

Keywords:

• Ni-encapsulated ZTA particles
• Electroless deposition
• Ionic liquid additive
• High-chromium cast iron matrix composites
• Abrasive wear resistance

Acknowledgements

The authors acknowledge the financial support of the National Natural Science Foundation of China (Project No. 51604136, 51571103, 51274108) and the China Postdoctoral Science Foundation (Project No. 2016M592716).