Study on the High-Temperature Oxidation Behavior of Mo-Si-Based Alloys

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Project title

Code/計畫編號

NSC100-2221-E019-032

Translated Name/計畫中文名

Mo-Si基合金高溫氧化行為之研究

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=2340317

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

31-07-2012

Bugetid/研究經費

935千元

ResearchField/研究領域

材料科技

本計畫擬探討「Mo-Si 基合金高溫氧化行為之研究」，茲將年度內的研究要點分述如下: (1) 本研究擬將探討鉬-矽基二元合金(原則上以三種介金屬Mo3Si、Mo5Si3 及MoSi2 為主) 在700~1200oC 的高溫氧化特性，氧化環境將包括恆溫與循環氧化，其中循環氧化之高、低溫循環時間原則上以6 小時為一次循環（約含升溫、持溫、及降溫各兩小時），並視情況進行多次循環測試。其次，本研究亦將針對抗氧化較佳的二元合金進行少量第三元素之添加（例如；加入鋁、鉻、或鈦等元素），以探討該元素對選定之鉬- 矽基合金提升抗氧化性能的可行性。 (2) 全程的恆溫與循環氧化是在熱重分析儀（TGA）中進行，藉由高靈敏之TGA 以連續監測氧化後的質量變化量來探討合金的氧化動力學行為，並瞭解其氧化反應機制。其次，以連續升/降溫的方式探討循環氧化與恆溫氧化之差異性。 (3) 所有氧化實驗後之試片將分別利用X-光繞射分析儀及金相顯微分析來探討腐蝕物組織及成分分布情形，並配合電子探測儀、掃瞄及穿透電子顯微鏡來分析腐蝕物形貌與腐蝕物空間分佈之差異。預期透過本計畫之研究成果，可以有系統地建立Mo-Si 基合金高溫氧化之資料庫，除將研究成果發表於國際期刊，並可將研究心得提供相關高溫之產業界應用。The one-year research proposal of ""Study on the high-temperature corrosion behavior of Mo-Si-based alloys"" is proposed. The main goals of this research are described as follows: (1) The isothermal and cyclic oxidations of Mo-Si-based alloys, containing the three binary alloys of Mo3Si, Mo5Si3, and MoSi2, will be studied over the temperature range of 700-1200oC in dry air. The cyclic duration of time for each high-to-room temperature cycle is set for about 6 hour, containing an individual 2-h exposure for heating, isothermal oxidation, and cooling, and multiple cyclic durations may be applied for various alloys. In addition, the effects of ternary elements (such as Al, Cr, Ti, etc) on the oxidation kinetics of the better oxidation-resistant binaries will also be studied to investigate the possible improvement of oxidation resistance for the ternary additions. (2) The oxidation of all the samples will be performed by continuously measuring mass-change data through thermo-gravimetric analyzer (TGA). Both isothermal- and cyclic-oxidation conditions will be explored to study the possible difference in oxidation kinetics and reaction mechanisms of the alloys. (3) The oxidation data will be converted and compared to scale thickness obtained metallurgically. The phase constitution and spatial distribution of the oxides 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. The final goal of this research is not only to submit all the individual results to the international journals for publication, but also to wholly establish the systematically high-performance Ti-15-3 alloy database for industrial applications.

Keyword(s)

鉬-矽基合金
高溫腐蝕
氧化動力學
反應機制

DSpace CRIS

Study on the High-Temperature Oxidation Behavior of Mo-Si-Based Alloys

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