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TA32鈦合金高溫連續(xù)氧化行為研究
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南京航空航天大學機電學院

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The Isothermal Oxidatian Behavior of TA32 Titanium Alloy at Elevated Temperature
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Nanjing University of Aeronautics and Astronautics,Nanjing

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    摘要:

    本文采用增重法研究了表面有/無噴涂高溫潤滑劑的TA32鈦合金在熱成形溫度750℃~850℃范圍內氧化10min-240h的氧化行為,通過SEM和EDS等微觀分析方法對氧化層的表面形貌和成分、截面厚度和成分進行分析,并對氧化機理進行探討。結果表明,750℃-850℃內的氧化行為均符合直線-拋物線規(guī)律,800℃～850℃內氧化速率迅速增加,氧化程度劇烈,溫度是TA32鈦合金氧化行為的重要影響因素之一。750℃時,氧化膜基本沒有脫落,800℃時氧化膜部分脫落,溫度升高到850℃時,氧化皮大塊脫落。750℃-850℃內,隨著保溫時間的增加,氧化膜逐漸增厚,氧化物由顆粒狀變?yōu)槎贪魻詈歪槧?氧化皮逐漸由致密變得疏松多孔,抗氧化能力逐漸下降。TA32鈦合金在750℃保溫240h時,氧化層結構為：TiO<sub>2</sub>和Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/基體；在800℃下氧化240h時,氧化層結構為：TiO<sub>2</sub>和Al<sub>2</sub>O<sub>3</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/基體；在850℃下氧化240h時,表層氧化膜完全脫落。表面無噴涂試樣和表面噴涂氮化硼的試樣氧化規(guī)律一樣,均符合直線-拋物線規(guī)律,但表面無噴涂試樣的單位面積增重、氧化速率高于表面噴涂氮化硼的試樣,氧化膜厚度也更厚,說明氮化硼有很好的抗氧化性能。表面噴涂氮化硼的TA32鈦合金在750℃保溫240h時,氧化層結構為：TiO<sub>2</sub>和Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/Ti<sub>3</sub>Al/基體。

    Abstract:

    The weight gain method is used to study oxidation behaviors of the TA32 titanium alloy with/without coated high-temperature lubricants during 10min-240h oxidation within 750℃~850℃ thermoforming temperature in this paper. The surface topography and ingredients and section thickness and ingredients of the oxidation layer are analyzed by using the microscopic analysis method such as SEM and EDS and the oxidation mechanism is discussed. The results show that the oxidation behaviors abide by the line-parabola law within 750℃～850℃. The oxidation rate will quickly increase and oxidation becomes drastic within 800℃～850℃. The temperature is one of the significant factors affecting oxidation behaviors of the TA32 titanium alloy. The oxidation films seldom fall off at 750℃ and some oxidation films fall off at 800℃. When the temperature increases to 850℃, some bulky oxidation shells will fall off. With growth of the heat preservation time within 750℃～850℃, the oxidation film will become thicker, the oxidants will change from particles to short stick and needles, the oxidation shell will gradually change from compact structure to loose and porous structure, and the oxidation resistance will gradually reduce. When TA32 titanium alloy keeps at 750℃ for 240h, the oxidation layer structure is TiO<sub>2</sub>and Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/substrate;When TA32 titanium alloy keeps at 800℃ for 240h, the oxidation layer structure is TiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/substrate;When the TA32 titanium alloy is oxidized for 240h at 850℃, the surface oxidation film will fully fall off. The oxidation laws of the non-coated samples and samples coated with the boron nitride are same and abide by the line-parabola law, but the weight gain and oxidation rate of the unit area of the non-coated samples will be higher than that of the samples coated with the cubic boron nitride and the oxidation film of the non-coated samples is thicker. It indicates that the boron nitride can resist oxidation. When the TA32 titanium alloy coated with the boron nitride keeps at 750℃ for 240h, the oxidation structure is TiO<sub>2</sub>and Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/ Al<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/Ti<sub>3</sub>Al/substrate.

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引用本文

梁錫梅,陳明和,蘇楠,羅峰. TA32鈦合金高溫連續(xù)氧化行為研究[J].鈦工業(yè)進展,2019,36(2).

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  • 收稿日期:2018-09-16
  • 最后修改日期:2018-10-29
  • 錄用日期:2018-10-31
  • 在線發(fā)布日期: 2020-10-22
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