Table 1 - uploaded by Maksym Ukrainets
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Source publication
The wetting and special features of the contact interactions in the NiAl–ZrB 2 system have been studied. The phase and chemical compositions of the interaction products have been analyzed. The struc tures and properties of composite materials of the above system and coatings made of them, which are designed to protect the components of gassturbine...
Context in source publication
Context 1
... to the XXray spectrum microanalysis (Table 1) the transition zone under study corresponds to ZrB 2 doped with nickel (phase 1, microhardness Hμ = 14.3 GPa), NiAl partially doped with Zr and B (phase 2, microhardness Hμ = 5.1 GPa), Ni 3 B, doped with Zr (phase 3, microhardness Hμ = 7.26 GPa). ...
Citations
... As reinforcing additives the borides of titanium, chromium and zirconium are taken. To determine the compatibility of the initial components the wettability and the mechanism of the physical and chemical interaction in systems NіAl (NiTi) -CrB 2 , NіAl (NiTi) -ZrB 2 and NіAl (NiTi) -TiB 2 was studied by the authors earlier [2,3]. It was found that as a result of wetting of chromium diboride with intermetallic compounds NіAl and NiTi the most intense drop spreading occur along the CrB 2 surface with formation of minimal contact angles (Θ ≈ 0° and Θ = 5° respectively). ...
The corrosion behavior in seawater of NiAl and NiTi intermetallics and composites based on them has been studied in this paper. It was shown that the developed composite NiTi-30 wt.% CrB2 hardly corrodes. The developed materials are meant for protect different shipbuilding details and details of hydropower equipment from aggressive sea water environments, as well as against hydro-abrasive and cavitation wear.
... The constant development of technology requires creating of new materials that will effectively resist the destructive effects of aggressive medium, in particular, seawater. That is why there is a need to develop new and improve existing composite materials that would guarantee an appropriate level of reliability and performance [1][2][3][4]. ...
The effect of the amount of chromium diboride additives in the NiAl intermetallic alloy on the corrosion resistance of composites in a 3 % NaCl aqueous solution simulating sea water, using anodic polarization curves, is studied. It is demonstrated that the introduction of more corrosionresistant components (chromium diboride) into the NiAl intermetallic alloy has no significant effect on the durability of such composites in sea water. The basic mechanisms of corrosion in the developed composite materials in corrosive aqueous medium are established.
Joining and integration technologies are integral to manufacturing of components based on ultrahigh‐temperature ceramics (UHTCs) such as transition metal diborides. Brazing is a particularly attractive joining technique because of its simplicity and versatility, but its use to join the UHTCs demands knowledge of the complex interplay among high‐temperature wettability, interfacial reactions, and chemical and thermoelastic compatibilities. This paper summarizes the research and development activities carried out over the last two decades to characterize the wettability and interfacial phenomena in brazing of refractory diboride ceramics. The contact angle data of various metal alloys on diboride‐based ceramics have been collected and critically evaluated in conjunction with an analysis of the chemistry and structure of the interface to understand the underlying mechanisms and phenomena that govern interface formation. It explores how solid–liquid interactions impact and are impacted by physical, chemical, and mechanical properties of joined materials. It also describes how this knowledge has been successfully utilized to create liquid‐phase bonded diboride‐based joints. The paper concludes with a summary of the current state of the art and highlights integration challenges and future research and technology development needs in the area.
