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摘要:
采用涂覆法在TZC钼合金表面制备了三种不同涂层A涂层、B涂层、C涂层。A涂层含有硼硅酸盐玻璃，B涂层在A涂层的基础上掺杂质量分数为15%的MoSi2粉，C涂层在B涂层的基础上添加少量的Al粉。使用加热炉、X射线衍射分析仪及扫描电镜等研究了涂层在
1200 ℃的氧化行为。结果表明，C涂层在高温氧化1 h内具有良好的保护能力，在氧化2 h的抗氧化性能较无涂层保护的情况下提高69%。在高温氧化后，A涂层及B涂层的截面形貌主要以MoO3和TiO2交替分布的疏松的组织为主。而铝粉的添加改变了氧化膜的物相组成，C涂层形成外层铝硅酸盐，中层铈钛氧化物，内层TiO2和钼硅化合物的三层结构，使其具有优良的抗氧化效果。Abstract:Three different coatings A, B and C were prepared on TZC molybdenum alloy surface by coating method. The A coating contains borosilicate glass, the B coating dopes MoSi2 powder with A mass fraction of 15% on the basis of the A coating, and the C coating adds a small amount of Al powder on the basis of the B coating. The oxidation behavior of the coatings at
1200 ℃ was studied by heating furnace, X-ray diffraction analyzer and scanning electron microscope. The results show that the C coating has a good protection performance within 1 h of high temperature oxidation, and the oxidation resistance of the C coating after 2 hours is 69% higher than that without coating protection. After high temperature oxidation, the cross-section morphology of A coating and B coating is dominated by the loose structure of MoO3 and TiO2 alternately distributed. The addition of aluminum powder changes the phase composition of the oxide film, and the C coating forms a three-layer structure of the outer aluminosilicate, the middle cerium titanium oxide, the inner TiO2 and molybdenum silicon compound, which makes it have excellent oxidation resistance.-
Keywords:
- molybdenum-base alloy /
- TZC /
- anti-oxidation /
- coating /
- silicide
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图 1 不同的试样涂层在
1200 ℃下的氧化失重Figure 1. The oxidation weight loss of different coating samples at
1200 ℃![]()
图 2 试样A涂层的表面和截面形貌:（a）表面形貌，（b）截面形貌
Figure 2. Surface and cross section morphology of the coating in sample A: (a) surface morphology, (b) cross section morphology
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图 4 D试样在
1200 ℃下氧化2 h表面形貌Figure 4. The surface morphology of the sample D oxidized at
1200 ℃ for 2 h![]()
图 5 A试样涂层
1200 ℃下表面氧化形貌：（a）0.5 h；（b）1 h；（c）2 h；（d）4 h；（e）8 h；成分分析：（f）图（b）中①点处；（g）图（c）中②点处；图（d）中方框区域的面扫图：（h）Mo；（i）O；（j）SiFigure 5. Surface oxidation morphology of coating of sample A at
1200 ℃: (a) 0.5 h; (b) 1 h; (c) 2 h; (d) 4 h; (e) 8 h; component analysis: (f) point ① in Fig.(b); (g) point ② in Fig.(c); surface scan results of the box area in Fig.(d): (h) Mo; (i) O; (j) Si![]()
图 6 B试样涂层
1200 ℃下表面氧化形貌：（a）0.5 h；（b）1 h；（c）图（a）中①点处的成分分析Figure 6. Surface oxidation morphology of coating of sample B at
1200 ℃: (a) 0.5 h; (b) 1 h; (c) component analysis of point ① in Fig.(a)![]()
图 7 C试样涂层
1200 ℃下表面氧化形貌：（a）0.5 h；（b）1 h；（c）图（b）中①点处的成分分析；（d）2 h；（e）4 h；（f）8 hFigure 7. The surface oxidation morphology of coating of sample C at
1200 ℃: (a) 0.5 h; (b) 1 h; (c) component analysis of point ① in Fig.(b); (d) 2 h; (e) 4 h; (f) 8 h![]()
图 8 试样氧化2 h后截面形貌及元素线扫描：（a）A3截面；（b）B3截面；（c）C3截面；（d）图（a）线Ⅰ处元素分布；（e）图（b）线Ⅱ处元素分布；（f）图（c）线Ⅲ处元素分布
Figure 8. Cross-section morphology and element line scanning of the samples after 2 h oxidation: (a) A3 cross-section; (b) B3 cross-section; (c) C3 cross-section; (d) element distribution at line Ⅰ in Fig.(a); (e) element distribution at line Ⅱ in Fig.(b); (f) element distribution at line Ⅲ in Fig.(c)
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图 9 C试样涂层氧化2 h截面形貌及元素分布（Fig.8（c））
Figure 9. Cross section morphology and element distribution of coating of sample C oxidation 2 h (Fig.8 (c))
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图 10 C试样涂层
1200 ℃表面氧化微观结构演变：（a）未氧化；（b）0.5 h；（c）1 h；（d）2 h；（e）4 h；（f）8 hFigure 10. Microstructure evolution of surface coating of sample C at
1200 ℃: (a) unoxidized; (b) 0.5 h; (c) 1 h; (d) 2 h; (e) 4 h; (f) 8 h表 1 TZC合金主要化学成分（质量分数）
Table 1 Main chemical components of TZC alloy
% C Si Zr Ti Ce Fe Mo 0.09 0.01 0.40 1.30 0.80 ≤0.01 余量 
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