Research on the Si-Ti High Temperature Oxidation-Resistant Coatings for Tantalum Alloys

Author:

Song Pei Pei1,Le Jun1,Ye Feng1,Sheng Xiao Cheng1,Zhang Xiao Wei1

Affiliation:

1. Chinese Academy of Science

Abstract

Si-Ti coatings were prepared on the surface of T-222 alloy by fused slurry method at different temperatures (1425-1500°C). Microstructure and composition of the coatings were characterized and analysed through scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), energy dispersive X-ray spectrometry (EDS) respectively. The coating fabricated at 1450°C exhibited excellent structure compatible with high temperature oxidation resistance. Its surface is relatively smooth with few holes and cracks and the main phase on the surface is (Ti, Ta)Si that possesses outstanding corrosion resistance. Moreover, the cross-sectional structure of the coating is smooth and compact which can effectively prevent O2 from permeation. The isothermal oxidation behaviors in pure O2 atmosphere at 1500°C for 2h finally demonstrate that the optimum coating temperature is 1450°C.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

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