Oxidation Resistance of In Situ Reaction/Hot Pressing Synthesized Ti2AlC-20% TiB2 Composite at 600-900 °C in Air

doi:10.1007/s40195-023-01647-z

Abstract

Abstract:

The oxidation behavior and kinetics of Ti₂AlC-20vol.%TiB₂ composite at 600-900 °C in air were investigated. The results showed that the oxidation kinetics of the composite followed a logarithmic law within the given temperature range, which indicated that the composites had excellent oxidation resistance. The selective oxidation of Al in Ti₂AlC was greatly enhanced, which facilitated the formation of a continuous and dense protective layer of Al₂O₃. Meanwhile, the existence of molten B₂O₃ inhibited the outward diffusion of Ti and inward diffusion of oxygen, which prevented the growth of anatase TiO₂ at 600 °C and rutile TiO₂ at 700-900 °C. Therefore, the incorporation of TiB₂ completely inhibited the abnormally rapid oxidation of bulk Ti₂AlC at 600 °C and improved its oxidation resistance at 700-900 °C.

Key words: MAX phase, Ti₂AlC-TiB₂ composite, Intermediate temperature oxidation, Oxidation kinetics

Wenting Wang, Jingjun Xu, Jun Zuo, Ke Ma, Yang Li, Guangqi He, Meishuan Li. Oxidation Resistance of In Situ Reaction/Hot Pressing Synthesized Ti₂AlC-20% TiB₂ Composite at 600-900 °C in Air[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(4): 739-748.

Figures/Tables 10

Fig. 1 Oxidation kinetics of a Ti2AlC and b Ti2AlC-20TiB2 composite at 600-900 °C in air

Fig. 2 Fitting curves of oxidation kinetics for a Ti2AlC and b Ti2AlC-20TiB2 composite at 600-900 °C in air. The inset in a is the fitting curve of the 600 °C

Table 1 Values obtained by fitting the curves in Fig. 1 of k, t0 and R2 (correlation coefficient)

		Oxidation temperature
		600 °C	700 °C	800 °C	900 °C
Ti₂AlC-20TiB₂	k	0.0043	0.0098	0.0124	0.0392
	t₀	0.0063	0.3005	0.3446	1.110
	R² (%)	97.44	98.29	97.75	99.96
	Oxidation law	Logarithmic
Ti₂AlC	k	6.5 × 10^-5	5.7 × 10^-6	2.8 × 10^-5	5.9 × 10^-3
	R² (%)	93.53	92.22	98.57	96.3
	Oxidation law	Parabolic	Cubic

Fig. 3 XRD patterns of a Ti2AlC-20TiB2 composite and Ti2AlC-20TiB2 composite oxidized in air for 20 h at b 600 °C, c 700 °C, d 800 °C and e 900 °C

Fig. 4 Raman spectrum of Ti2AlC-20TiB2 composite after oxidation at 600 °C in air for 20 h

Fig. 5 Surface morphologies of Ti2AlC oxidized in air for 20 h at a, b 600 °C, c, d 700 °C, e, f 800 °C and g 900 °C, h-j EDS element mappings of O, Al and Ti of g

Fig. 6 Surface morphologies of Ti2AlC-20TiB2 composite oxidized in air for 20 h at a, b 600 °C, c, d 700 °C, e, f 800 °C and g 900 °C, h-j EDS element mappings of O, Al and Ti of g

Fig. 7 Cross sections and EDS element mappings of O, Al and Ti of Ti2AlC oxidized in air for 20 h at a 600 °C, b 700 °C, c 800 °C and d 900 °C

Fig. 8 Cross sections and EDS element mappings of O, Al and Ti of Ti2AlC-20TiB2 composite oxidized in air for 20 h at a 600 °C, b 700 °C, c 800 °C and d 900 °C

Fig. 9 a TEM bright field image and TEM-EDS element mappings of cross section, b, d TEM observation area and c, e SAED images of the red circle in the b, d

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Oxidation Resistance of In Situ Reaction/Hot Pressing Synthesized Ti₂AlC-20% TiB₂ Composite at 600-900 °C in Air

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