Abstract
An Al/Ni composite coating was deposited on the surface of a pure Ti substrate by arc spray technology and plasma spray technology. In order to enable the in-situ reaction between the Al/Ni composite coating and the specimen, they were heated under different conditions. In addition, oxidation testing was conducted to test the oxidation-resistant property of the coating. The phase transition regulation of the coating after heating, the influence of heating at different temperatures and time on the reaction depth, and the correlated theory of the in-situ formation of the NiAl intermetallic compounds were studied and analyzed. The results showed that after the heat treatment, a ragged wave-like morphology was exhibited in the diffusion front of Al, and a small amount of the Ni in the diffusion region did not participate in the reaction. The growth of the NiAl intermetallic layer in the diffusion region of the Al/Ni/Ti specimen was obviously slower compared with the Al/Ni specimen.
Highlights
Titanium and titanium alloys are widely used as structural materials in fields such as the aerospace industry or automobile industry, due to their high melting point, low density, and their superior high-temperature mechanical properties [1,2,3,4,5]
An Al/Ni composite coating was deposited on the surface of a pure Ti substrate using arc spray technology and plasma spray technology
All of the surfaces of the specimens were sprayed with 150 μm thick Ni coatings by plasma spray technology, and 150 μm thick Al coatings were deposited onto the Ni coatings by arc spray technology
Summary
Titanium and titanium alloys are widely used as structural materials in fields such as the aerospace industry or automobile industry, due to their high melting point, low density, and their superior high-temperature mechanical properties [1,2,3,4,5]. 1373 K, in a general atmospheric environment) [6] have excellent high-temperature resistance to oxidation. This is because NiAl intermetallics have high melting points. A dense Al2 O3 film that has excellent protection performance can be formed on the surface of metal materials when there is a high Al content in the NiAl intermetallic [7]
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