Effect of Trace O Element on High-temperature Wettability Between Ni3Al Melt and Y2O3 Ceramic

doi:10.1007/s40195-017-0679-z

Abstract

Abstract:

Effect of trace O element on the high-temperature wettability between Ni₃Al scrap melt and Y₂O₃ ceramic at 1873 K is investigated. With the increase in O content in Ni₃Al scrap melt from 6 to 21 ppm, the equilibrium contact angle decreases from 93.3° to 88.9°. The initial surface tension and adhesive work of molten Ni₃Al scrap drop from 3153.5 to 807.4 mN m^-1 and from 2974.6 to 882.2 mN m^-1, respectively. The average spreading rate increases from 0.03° s^-1 to 0.17° s^-1. The whole wetting processes are divided into four periods. The main driving force for spreading in period (1) is the adsorption and diffusion of active atoms around the interface. Trace O content in Ni₃Al scrap has a significant impact on interfacial reactions which mostly take place in the second stage, and can accelerate the spreading process on Y₂O₃ substrate. The reaction products during wetting process are Y₃Al₅O₁₂, YAlO₃ and Al₂O₃.

Key words: Ni3Al scrap, Wetting, Interaction, Yttria, Oxygen content

Peng Bai, Hua-Rui Zhang, Bei-Bei Wan, Chao Ran, Hu Zhang. Effect of Trace O Element on High-temperature Wettability Between Ni₃Al Melt and Y₂O₃ Ceramic[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(5): 552-560.

Figures/Tables 11

Table 1 Nominal element compositions of Ni3Al superalloy (wt%)

Al	Mo	Ta	Cr	Ni
7.6-8.3	9.0-13.0	2.4-4.0	1.5-2.5	Bal.

Fig. 1 Schematic of modified sessile drop wettability testing apparatus

Fig. 2 Variation of contact angle and drop base radius with time for molten Ni3Al superalloy with O contents of 6 ppm a, 10 ppm b, 21 ppm c variation of initial contact angle and equilibrium contact angle with different O contents in Ni3Al superalloy scraps at 1873 K d

Fig. 3 a Initial surface tension and b initial adhesive work in Ni3Al/Y2O3 wetting system with different O contents at 1873 K

Fig. 4 Wetting interfaces between Y2O3 substrates and Ni3Al superalloy scraps with O contents of 6 ppm a, 10 ppm b, 21 ppm c wetting interface phase compositions of different O contents containing system d

Fig. 5 Microstructures of Ni3Al scraps with O contents of 6 ppm a, 10 ppm b and 21 ppm c after wetting on Y2O3 substrate at 1873 K

Fig. 6 SEM a, b and CSLM 3D visualization c, d images of surface microstructures of Y2O3 substrate before a, c and after b, d wetting

Fig. 7 a Variation of contact angle with time in period (1) and b variation of ln(cosθ F - cosθ) with time in period (2) (θ F: equilibrium contact angle)

Table 2 Adhesive work and surface free energy change in period (1)

O content	Holding time (s)	Adhesive work (mN m^-1)		Surface free energy change (kcal mol^-1)
O content	t	w _ad(0)	w _ad(_t₎	w _a×mol(0)	w _a×mol(_t₎
6 ppm	88.1	2974.6	2629.7	81.67	72.21
10 ppm	65.7	1325.9	3140.8	36.41	86.24
21 ppm	15.0	822.2	2346.7	22.58	64.43

Fig. 8 Mechanism and direction of diffusion and adsorption around Ni3Al/Y2O3 wetting interface in different O content systems

Fig. 9 Variation of initial surface tension with C O at 1873 K in Ni3Al superalloy scraps

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Effect of Trace O Element on High-temperature Wettability Between Ni₃Al Melt and Y₂O₃ Ceramic

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