Microstructure and oxidation resistance of y modified silicide coatings prepared on zr-ti-al alloy

Jia Hua He, Xi Ping Guo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Zr-20Ti-5Al (at. %) alloy used as substrates for Si-Y2 O3 co-deposition experiments was prepared by firstly vacuum non-consumable arc melting and then high frequency induction skull melting. The results showed that Y modified silicide coating prepared at 1250° C for 4 h possessed a double-layer structure, mainly consisting of a thick (Zr, Ti)Si2 outer layer and a 15 µm thick (Zr, Ti)Si inner layer. Meanwhile, the growth rate of ZrSi2 phase changed with temperature, while the growth rate of ZrSi did not vary significantly with temperature. The growth of the coating as well as the two layers followed parabolic laws, and the co-deposition process was controlled by diffusion. ZrSi2 was not appropriate as oxidation-resistant coatings to protect Nb based alloy from oxidation due to the lack of the formation of good quality glassy SiO2 layer in the scale.

Original languageEnglish
Title of host publicationFunctional and Functionally Structured Materials II - Chinese Materials Conference 2017, CMC 2017
EditorsYa Fang Han
PublisherTrans Tech Publications Ltd
Pages365-374
Number of pages10
ISBN (Print)9783035712445
DOIs
StatePublished - 2018
EventChinese Materials Conference, CMC 2017 - Yinchuan City, Ningxia, China
Duration: 6 Jul 201812 Jul 2018

Publication series

NameMaterials Science Forum
Volume913
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferenceChinese Materials Conference, CMC 2017
Country/TerritoryChina
CityYinchuan City, Ningxia
Period6/07/1812/07/18

Keywords

  • Oxidation resistance
  • Pack cementation
  • Si-YO co-deposition
  • Zr-Ti-Al alloy

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