An effective strategy towards construction of CVD SiC fiber-reinforced superalloy matrix composite

doi:10.1016/j.jmst.2020.01.050

Abstract

Abstract:

In this work, a modified approach for preparing CVD SiC fiber-reinforced superalloy matrix composites was rationally developed. The composites were fabricated by vacuum hot pressing (VHP) process using precursor wires coated with (Al + Al₂O₃) diffusion barrier layers and GH4169 superalloy coatings. BNi-7 brazing filler metals were introduced on the surface of precursor wires in order to decrease the temperature of the VHP process. It was found that the VHP temperature was reduced by about 100 °C, and the melting, diffusion, nucleation and growth processes of BNi-7 fillers at 900 °C motivated the recrystallization and plastic flow of the matrix under the increasing pressure, thereby a compact composite composed of intact SiC fibers and fine equiaxial grain structure superalloy matrix was achieved. Meanwhile, the elements were distributed homogeneously among the fibers in the composite and no interfacial reactions occurred. This method provides a new insight for designing and manufacturing high-quality composites in practical engineering.

Key words: SiC fiber, Superalloy, Diffusion barrier, Brazing filler metal

Haoqiang Zhang, Lin Liu, Zhiliang Pei, Nanlin Shi, Jun Gong, Chao Sun. An effective strategy towards construction of CVD SiC fiber-reinforced superalloy matrix composite[J]. J. Mater. Sci. Technol., 2020, 49: 179-185.

Figures/Tables 12

Table 1 Composition of GH4169 superalloy targets (wt.%).

C	Cr	Mo	Nb	Al	Ti	Ni	Co	Fe
≤0.08	20.83	2.86	4.81	0.39	1.11	50.57	0.44	Bal.

Table 2 Chemical composition of BNi-7 BFMs (wt.%).

C	Cr	P	B	Si	Fe	Ni
≤0.06	13.0~15.0	9.7~10.5	0.01	0.10	0.2	Bal.

Fig. 1. Schematic illustration of procedures of fabricating the composite.

Table 3 Detailed sputtering parameters used for depositing (Al + Al2O3) diffusion barrier layer and the GH4169 superalloy coating.

		Base pressure (Pa)	Frequency (kHz)	Duty cycle (%)	Voltage (V)	Current (A)	Time (h)
(Al + Al₂O₃)	Al	4 × 10^-3	30	33.3	600	1	0.1
(Al + Al₂O₃)	Al₂O₃	4 × 10^-3	30	33.3	400	1.5	18
GH4169		4 × 10^-3	30	33.3	600	1.5	18.5

Fig. 2. Side face (a), surface (b), cross-section (c) and interface (d) morphologies of precursor wire.

Fig. 3. Morphologies of composites at condition of 1020 °C/40 MPa/2 h (a), 1020 °C/50 MPa/2 h (b).

Fig. 4. Morphologies of composites fabricated in 900 °C/50 MPa/2 h with 15 mg/cm2 (a), 900 °C/50 MPa/2 h with 30 mg/cm2 (b), 900 °C/50 MPa/2 h with 45 mg/cm2 (c), 900 °C/60 MPa/2 h with 30 mg/cm2 (d), 900 °C/70 MPa/2 h with 30 mg/cm2 (e), 900 °C/80 MPa/2 h with 30 mg/cm2 (f).

Fig. 5. Interface morphology and elemental distribution across fibers in composite prepared on condition of 900 °C/70 MPa/2 h.

Fig. 6. XRD patterns of precursor wire and composite (900 °C/70 MPa/2 h).

Fig. 7. Microstructure (a) and EBSD orientation map (b) of matrix in cross-section of composite.

Fig. 8. Pole figures of matrix in composite.

Fig. 9. Schematic illustration of the recrystallization process.

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