High Temperature Hydrogenation Behavior of Bulk Titanium Aluminum Carbide

doi:10.15541/jim20130584

Abstract

Abstract:

Ti₃AlC₂ is a new type of nano-layered machinable ceramic with numerous salient properties. Therefore, recently it is considered to be a promising candidate for new generation reactors as the key structural material. In this work, the reaction product and material morphology between nano-layered Ti₃AlC₂ and hydrogen were investigated by XRD, SEM, EDS, XPS and Raman. The resulted gaseous products were calculated by Factsage sofeware. Under the condition of 700-1000℃, hydrogen atmosphere (low oxygen pressure), solid products are Al₂O₃, TiO₂ and C and gaseous product is CH₄. Hydrides are not detected in the current experiments. The SEM results indicate that the reacted samples keep intact and cracks are not formed on the surface, indicating the high temperature thermal stability of Ti₃AlC₂ in hydrogen. These results can be attributed to the formation of oxides on the surface of specimens.

Key words: Ti3AlC2, hydrogen atmosphere, thermal stability, hydrogen resistance

CLC Number:

TQ174

CHEN Chen, ZHANG Hai-Bin, PENG Shu-Min, ZHAO Lin-Jie, ZHU Jian-Guo. High Temperature Hydrogenation Behavior of Bulk Titanium Aluminum Carbide[J]. Journal of Inorganic Materials, 2014, 29(8): 864-868.

Figures/Tables 6

Fig. 1 XRD patterns of Ti3AlC2 specimens after treatment at 700-1000℃ for 10 h in 1mol% H2 and 99mol% Ar(contain-ing 10-6wt% O2)

Fig. 2 Raman spectra of bulk Ti3AlC2 after treatment at 700- 1000℃ in 1mol% H2 and 99mol% Ar(containing 10-6wt% O2)

Fig. 3 XPS surface analysis of Ti3AlC2 after hydrogen treatment (containing 10-6 wt% O2) at 800℃ and 1000℃ (a) Al2p; (b) O1s; and (c) Ti2p contrast

Fig. 4 Surface morphologies of the Ti3AlC2 specimens after treatment for 10 h at (a) 700℃, (b) 800℃, (c) 900℃ and (d) 1000℃ in the 1mol% H2 and 99mol% Ar (containing 10-6wt% O2)

Table 1 EDS analyses of spots A, B, C, D, E in Fig. 4

	A	B	C	D	E
O/wt%	20.29	36.23	46.57	42.27	56.53
Al/wt%	14.30	41.67	12.97	31.33	35.99
Ti/wt%	51.54	18.38	32.59	19.22	7.48

Fig. 5 Simulated result of gaseous reaction product of Ti3AlC2 and H2 at 500-1200℃

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