Effect of Open Porosity of Y2O3 Ceramic on the Apparent Contact Angles and Interactions Between Ti47Al Alloys and Y2O3 Ceramic

doi:10.1007/s40195-016-0511-1

Acta Metallurgica Sinica (English Letters) ›› 2017, Vol. 30 ›› Issue (5): 456-463.DOI: 10.1007/s40195-016-0511-1

收稿日期:2016-08-29 修回日期:2016-09-25 出版日期:2017-05-20 发布日期:2017-05-23
作者简介:
作者简介冯立,男,1984年生,硕士,工程师

Effect of Open Porosity of Y₂O₃ Ceramic on the Apparent Contact Angles and Interactions Between Ti47Al Alloys and Y₂O₃ Ceramic

Chao Ran^1,²(), Hua-rui Zhang^1,²(), Hu Zhang^1,²(), Bei-bei Wan^1,², Peng Bai^1,²

1.School of Materials Science and Engineering Beihang University Beijing China
2.Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology Beihang University Beijing China

Received:2016-08-29 Revised:2016-09-25 Online:2017-05-20 Published:2017-05-23
About author:
These authors contributed equally to this work.

摘要/Abstract

Abstract:

The effect of open porosity of Y₂O₃ ceramic on the apparent contact angle and interaction between molten Ti47Al alloy and Y₂O₃ ceramic substrates under pure Ar was investigated by using a sessile drop method at 1600 °C. As the open porosity increased from 9.6% to 30.3%, the spreading rate of molten Ti47Al alloys on Y₂O₃ ceramic substrates reduced from 2.3 to 1.1°/s; meanwhile, the final equilibrium contact angles increased from 55.8° to 63.6°. The microstructure observations revealed that with increasing the open porosity of the Y₂O₃ substrates, the thickness of sand adhesion at the interfaces of the alloy droplets increased from 5.4 to 15.7 μm, and ceramic particles in the alloy matrix increased as well. The increasing contact area between the molten alloy and the substrate played a dominant role in determining the interaction on TiAl/Y₂O₃ interface.

Key words: Contact angle, Yttria, Titanium aluminides, Interaction, Open porosity

. [J]. Acta Metallurgica Sinica (English Letters), 2017, 30(5): 456-463.

Chao Ran, Hua-rui Zhang, Hu Zhang, Bei-bei Wan, Peng Bai. Effect of Open Porosity of Y₂O₃ Ceramic on the Apparent Contact Angles and Interactions Between Ti47Al Alloys and Y₂O₃ Ceramic[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(5): 456-463.

图/表 14

Table 1 Open porosity of Y2O3 ceramic substrates

Specimens	Y₂O₃-A	Y₂O₃-B	Y₂O₃-C
Open porosity (%)	9.6	13.8	30.3

Fig. 1 Schematic illustration of the sessile drop apparatus

Fig. 2 SEM images of Y2O3 substrates: a, c, e surface images of Y2O3-A, Y2O3-B and Y2O3-C substrates, respectively; b, d, f cross-sectional images of Y2O3-A, Y2O3-B and Y2O3-C substrates

Fig. 3 Images of sessile droplets of molten Ti47Al samples on Y2O3 substrates with different open porosities at 1600 °C

Fig. 4 Variation in contact angle of molten TiAl alloy with time on Y2O3 substrates with different open porosities

Fig. 5 Equilibrium contact angles of molten Ti47Al droplets on Y2O3 substrates with different open porosities

Fig. 6 SEM micrographs of the cross section perpendicular to the interface of the alloy droplets: a Ti47Al/Y2O3-A system; b Ti47Al/Y2O3-B system; c Ti47Al/Y2O3-C system

Fig. 7 Thickness of sand adhesion of the TiAl droplets resting on different open porosities Y2O3 substrates

Fig. 8 Map analysis of Ti,Al,Y, and O elements of the interface of the solidified alloy droplets: a Ti47Al/Y2O3-A system; b Ti47Al/Y2O3-B system; c Ti47Al/Y2O3-C system

Fig. 9 Backscattered electron images of the matrix of alloy droplets for a Ti47Al/Y2O3-A system; b Ti47Al/Y2O3-B system; c Ti47Al/Y2O3-C system

Fig. 10 Volume fraction of Y2O3 particles in alloy droplets on Y2O3 substrates with different open porosities

Fig. 11 Schematic configurations of sessile drops resting on the substrates with different open porosities

Fig. 12 Surface roughness and contact angle versus open porosity of Y2O3 substrates

Fig. 13 Typical 3D surface morphology of the porous ceramic substrate

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Effect of Open Porosity of Y₂O₃ Ceramic on the Apparent Contact Angles and Interactions Between Ti47Al Alloys and Y₂O₃ Ceramic

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