刘小菊,王腾,李偲偲,李强.等离子喷涂热障涂层高温 TGO 的形成与生长研究[J].表面技术,2015,44(11):91-96,103.
LIU Xiao-ju,WANG Teng,LI Cai-cai,LI Qiang.Formation and Growth Behavior of TGO in Air Plasma Sprayed Thermal Barrier Coatings at High Temperature[J].Surface Technology,2015,44(11):91-96,103 |
| 等离子喷涂热障涂层高温 TGO 的形成与生长研究 |
| Formation and Growth Behavior of TGO in Air Plasma Sprayed Thermal Barrier Coatings at High Temperature |
| 投稿时间：2015-08-20 修订日期：2015-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.11.015 |
| 中文关键词: APS 热障涂层 等温氧化 热生长氧化物 生长动力学 微观结构 |
| 英文关键词:APS TBCs isothermal oxidation TGO growth kinetics microstructure |
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| Author | Institution |
| LIU Xiao-ju | School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China |
| WANG Teng | School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China |
| LI Cai-cai | School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China |
| LI Qiang | School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China |
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| 中文摘要: |
| 目的 研究热障涂层(TBC)和纯粘结层(BC)在 1100 ℃ 下的氧化动力学,探讨热障涂层中热生长氧化物(TGO)组织结构的演化规律。 方法 运用大气等离子喷涂技术(APS)制备涂层,对比分析热障涂层和纯粘结层涂层在 1100 ℃下等温氧化 2,5,10,20,50,100,200,350 h 后 TGO 的厚度变化,并对粘结层表面和热障涂层截面分别进行 XRD 和 SEM 分析。 结果 热障涂层和纯粘结层在 1100 ℃ 下的氧化动力学均遵循抛物线规律,其氧化速率常数分别为 0. 344,0. 354 μm/ h0. 5。 等温氧化 5 h 后,TGO 的主要成分为 α-Al2O3;随氧化时间的增加,生成 Cr2O3、尖晶石、CoO 和 NiO 的混合氧化物;等温氧化 100 h 后,CoO消失,NiO 的含量减少,Cr2O3 和尖晶石氧化物的含量增加;等温氧化 350 h 后,TGO 中出现了裂纹,但涂层仍未剥落,TGO 最终由顶层多孔的混合氧化物层和底层具有柱状晶结构的 α-Al2O3 层组成。 结论 顶层陶瓷层(TC)对热障涂层氧化速率常数的影响很小。 TGO 中 α-Al2O3 首先形成并以柱状结晶的方式生长,混合氧化物在 α-Al2O3 上形成,TGO 生长速度逐渐变缓。 |
| 英文摘要: |
| Objective To investigate growth kinetics of TBCs and pure BC as well as microstructure evolution of TGO in TBCs. Methods Variations in TGO thickness of APS-TBCs and pure BCs after isothermal oxidation at 1100 ℃ for 2,5,10,20,50,100, 200,350 h were comparatively analyzed. XRD and SEM were used to characterize the surface and cross-section of TBCs. Results TGO growth kinetics for both samples followed parabolic laws, and the oxidation rate constants of TBCs and pure BC were 0. 344 μm/ h0. 5 and 0. 354 μm/ h0. 5, respectively. TGO mainly consisted of α-Al2O3 after isothermal oxidation for 5 h. CoO, NiO, Cr2O3 and spinel oxides appeared with the increase of oxidation time. CoO disappeared, and content of NiO reduced while contents of Cr2O3 and spinel oxides increased after isothermal oxidation for 100 h. Cracks appeared but failure of TBCs did not occur after isothermal oxidation at 1100 ℃ for 350 h. TGO eventually consisted of a sub-Al2O3 layer with columnar microstructure and the upper porous mixture. Conclusion TCs had little effect on the oxidation rate constant of BCs. α-Al2 O3 was firstly formed in TGO and grew in form of columnar crystals, then mixed oxides appeared on α-Al2 O3 and the growth rate of TGO became slow. |
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