Effects of Surface Modifications on the High-Temperature Corrosion Behavior of High Strength .beta.-Ti Alloy

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基本資料

Project title

Code/計畫編號

NSC99-2221-E019-012

Translated Name/計畫中文名

高強度β-鈦合金加工製程及特性研究---子計畫二：表面改質效應對高強度β-鈦合金高溫腐蝕行為之研究

Project Coordinator/計畫主持人

Wu Kai

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Optoelectronics and Materials Technology

Website

https://www.grb.gov.tw/search/planDetail?id=2121053

Year

2010

Start date/計畫起

01-08-2010

Expected Completion/計畫迄

31-07-2011

Bugetid/研究經費

981千元

ResearchField/研究領域

材料科技

The research proposal of ""Effects of surface modifications on the high-temperature behavior of -titanium alloys"" is proposed, which is a part of the two-year group-proposal of ""The study of processing and characteristics of high-strength -titanium alloyâ€� (in Proposal Part II). The main goals of this research are described yearly as follows: (1) The first year is to study the effects of water vapor on proper surface-modifications (i.e. containing Ni-plating plus Al/Cr dipping, or Al/Cr pack-cementations) on the high-temperature isothermal-oxidation of Ti-15V-3Cr-3Al-3Sn (Ti-15-3) over the temperature range of 700-900oC in wet air. The results of oxidation kinetics and reaction mechanisms will be compared to those of the untreated base-alloy to evaluate the corrosion resistance of the various surface-modifications. The corrosion tests of samples are performed by continuously measuring mass-change data through thermo-gravimetric analyzer (TGA) or the tube furnace with quartz springs. The corrosion data are converted and compared to scale thickness obtained metallurgically. Pt-marker studies are performed to determine reaction mechanisms of the alloys, and the phase constitution and spatial distribution of the scales as well as the microstructural characterization of the scale/substrate interface will be investigated by X-ray diffraction (XRD), OM, SEM, EPMA, AES, and TEM analyses. (2) In the second year, based on the results of all sub-proposals in the first year (such as the microstructure refining in Part I and the grain coarsening in parts III and IV), the effects of the best surface-modified samples deposited by various ratios of Na2SO4/NaCl/V2O5 mixed salts will also be evaluated, as the similar procedure of the first year. The roles of microstructure change and surface modifications on the corrosion resistance of the Ti-15-3 alloy will be discussed in order to build up the database for the high-temperature corrosion and prevention. This is done to establish the fundamental database for the high-temperature corrosion behavior of the -titanium alloy. All group applicants will share their experiences with others for the purposes of obtaining the best high-strength -titanium alloy combined with excellent surface-modifications and grain structure after the two-year research study. The final goal of this research is not only to publish all the individual results on the international journals, but also to wholly establish the systematically high-performance -titanium alloy database for industrial applications.

Keyword(s)

熱腐蝕
直線律
Na2SO4
NaVO3.
hot corrosion
Ti-15-3
TiO2
Al2O3

DSpace CRIS

Effects of Surface Modifications on the High-Temperature Corrosion Behavior of High Strength .beta.-Ti Alloy

基本資料

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