Fabrication, Pore Structures and Mechanical Properties of (TiB2-Al2O3)/NiAl Porous Composites

doi:10.1007/s40195-017-0650-z

Abstract

Abstract:

Open-celled porous (TiB₂-Al₂O₃)/NiAl composites were successfully fabricated by using spherical carbamide as space holders via self-propagating high-temperature synthesis (SHS). Effects of 10Al-3B₂O₃-3TiO₂ contents (0-20 wt%) on the pore structures and the quasi-static compressive behaviors of the resultant materials were investigated. The porous (TiB₂-Al₂O₃)/NiAl composites exhibit composite pore structure consisting of homogeneously distributed and interconnected millimeter pores and micropores. The millimeter pores virtually inherit the shape and size of carbamide particles, while the pore size of micropores increases with increasing the 10Al-3B₂O₃-3TiO₂ content. Depending on the volume fraction of the carbamide, the porosity of the porous materials can be easily controlled in a range of 55%-85%. When the porosity is about 72%, the compressive strengths of porous NiAl and porous (TiB₂-Al₂O₃)/NiAl composite with 15% 10Al-3B₂O₃-3TiO₂ in green compact are 19 and 32 MPa, and the corresponding strains are 2.9% and 5.7%, respectively. Furthermore, the quasi-static compressive behavior of porous (TiB₂-Al₂O₃)/NiAl composites can be estimated by Gibson-Ashby model.

Key words: Self-propagating high-temperature synthesis (SHS), Pore structure, Compressive properties, Porous (TiB₂-Al₂O₃)/NiAl

Jie Wu, Zhao-Tai Yang, Hong-Zhi Cui, Na Wei, Xiao-Jie Song. Fabrication, Pore Structures and Mechanical Properties of (TiB₂-Al₂O₃)/NiAl Porous Composites[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(12): 1145-1154.

Figures/Tables 15

Fig. 1 XRD patterns of products with different contents of 10Al-3B2O3-3TiO2 powders in corresponding green compacts

Table 1 Phase compositions of the porous (TiB2-Al2O3)/NiAl composites (wt%)

Sample	Phase compositions (wt%)
Sample	NiAl	TiB₂	Al₂O₃
(Ni-Al) + 10% (10Al-3B₂O₃-3TiO₂)	87.7	4.4	7.9
(Ni-Al) + 15% (10Al-3B₂O₃-3TiO₂)	82.9	6.3	10.8
(Ni-Al) + 20% (10Al-3B₂O₃-3TiO₂)	78.2	7.3	14.5

Table 2 Chemical compositions of the porous (TiB2-Al2O3)/NiAl composites (wt%)

Sample	Ni	Al	Ti	B	O
(Ni-Al) + 10% (10Al-3B₂O₃-3TiO₂)	60.1	31.8	3.0	1.4	3.7
(Ni-Al) + 15% (10Al-3B₂O₃-3TiO₂)	56.8	31.8	4.3	2.0	5.1
(Ni-Al) + 20% (10Al-3B₂O₃-3TiO₂)	53.6	32.3	5.1	2.2	6.8

Fig. 2 Gibbs free energy (ΔG) as a function of temperature for the possible reactions in Ni-Al and 10Al-3B2O3-3TiO2 mixed powders

Fig. 3 Cross-sectional morphologies of porous (TiB2-Al2O3)/NiAl composites with 15% 10Al-3B2O3-3TiO2 and different porosities: a about 60%, b about 72%, c about 85%

Fig. 4 Morphologies of the carbamide particles

Fig. 5 SEM images of porous (TiB2-Al2O3)/NiAl composites with porosity of about 72% and different 10Al-3B2O3-3TiO2 contents in corresponding green compacts: a 5%, b 10%, c 15%, d 20%

Fig. 6 SEM image of porous (TiB2-Al2O3)/NiAl composite with the porosity of about 80% and the 10Al-3B2O3-3TiO2 content of 15%

Fig. 7 SEM images of micropores of porous (TiB2-Al2O3)/NiAl composites with porosity of about 72% and different 10Al-3B2O3-3TiO2 contents in corresponding green compacts: a 0, b 5%, c 10%, d 15%, e, f 20%

Table 3 Adiabatic temperatures (Tad) of the mixtures composed of Ni-Al and 10Al-3B2O3-3TiO2 powders when they are ignited at 623 K

Specimen	Adiabatic temperatures (K)
Ni-Al	2236
(Ni-Al) + 5% (10Al-3B₂O₃-3TiO₂)	2263
(Ni-Al) + 10% (10Al-3B₂O₃-3TiO₂)	2290
(Ni-Al) + 15% (10Al-3B₂O₃-3TiO₂)	2317
(Ni-Al) + 20% (10Al-3B₂O₃-3TiO₂)	2343
(Ni-Al) + 25% (10Al-3B₂O₃-3TiO₂)	2370
10Al-3B₂O₃-3TiO₂	2773

Fig. 8 SEM images of pore morphologies of porous (TiB2-Al2O3)/NiAl composites: a without carbamide particles, 15% 10Al-3B2O3-3TiO2, b with carbamide particles, 25% 10Al-3B2O3-3TiO2

Fig. 9 Nominal stress-strain curves of porous NiAl and (TiB2-Al2O3)/NiAl composite

Fig. 10 Fracture morphologies of a porous NiAl; b porous (TiB2-Al2O3)/NiAl composite with 15% 10Al-3B2O3-3TiO2

Fig. 11 Influence of 10Al-3B2O3-3TiO2 contents on the compressive strength of porous (TiB2-Al2O3)/NiAl composites with porosity of about 72%

Fig. 12 Dependence of the compressive strength on relative density for porous (TiB2-Al2O3)/NiAl composites with 15% 10Al-3B2O3-3TiO2

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Fabrication, Pore Structures and Mechanical Properties of (TiB₂-Al₂O₃)/NiAl Porous Composites

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