Microstructural characteristics of TiB₂–TiC–NiAl composite coatings via Plasma Cladding Process

ABSTRACT

TiB₂–TiC–NiAl composite coatings have been prepared via Plasma Cladding Process. The phase composition, microstructure and influence of Ni–Al content were investigated by X-ray diffraction, scanning electron microscopy and electron probe micro-analyser. The results show that the coating from Ti–B₄C consists of TiB₂ and TiC, while coatings from Ti–B₄C and Ni–Al mixed system consist of TiB₂, TiC and NiAl phases. TiB₂and TiC are homogenously distributed in the coating due to NiAl additives. TiB₂ exhibits hexagon or long strip shapes and TiC is tend to spherical shapes, while NiAl phase has no regular shape distributing among TiB₂ and TiC particles. The prepared TiB₂–TiC based composite coating shows higher density with the rising of NiAl content.

KEYWORDS:

• Composite coating
• microstructure
• TiB₂–TiC
• plasma cladding
• in-situ synthesis

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National 863 Plan project [grant number 2015AA034404], National Natural Science Foundation of China [grant number 51772167] and Zhejiang Provincial Education Department Project [grant number Y201636687].