Abstract
NiAl composite coating strengthened by ZrC and ZrB2 phases is synthesized by the plasma cladding process. The influence of cladding speed on microstructrue and properties of coatings is studied. The main phases of coatings are NiAl, γ-(Fe,Ni), ZrC and ZrB2 phases. ZrC is in the shape of points and small blocks, ZrB2 shows long strips and needle bar. The slower the cladding speed, the larger the size of the reinforcing phases. With the increase of cladding speed, the wear resistance of the coatings improves. Coating with the cladding speed of 10mm/s has excellent wear-resistance property owing to high hardness and low friction coefficient. ZrC and ZrB2 strengthening phases play an important role. The main wear mechanism of NiAl composite coating is adhesive wear.
Highlights
Wear caused by mechanical friction is the interaction between parts and other components
There are many literatures about the composites or coatings which are strengthened by ZrC or ZrB2 phases[13,14,15,16,17]
The NiAl composite coatings are produced by plasma cladding process
Summary
Wear caused by mechanical friction is the interaction between parts and other components. Metal-matrix composite (MMC) coatings have excellent properties, such as specific stiffness, good thermal conductivity and good corrosion resistance, high modulus, stability at high temperature and wear resistance[2,3,4]. They are comprehensive applied as promising candidates of advanced materials. There are many literatures about the composites or coatings which are strengthened by ZrC or ZrB2 phases[13,14,15,16,17] Those materials have good properties such as wear resistance[13,16], ablation resistance[15], oxidation resistance[17], and so on. Plasma cladding process is widely used to many industrial aspects because of high heating, good controllability and low
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