413 Ni_3Al/α-Al_2O_3 複合材料の作製と諸特性

概要

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The preparation process of Ni_3Al/α-Al_2O_3 composite via a benzoate-precursor method has been studied. The precursors, Ni_3Al(N_2H_4)_6(C_6H_5COO)_<7.7>(OH)_<1.3>, containing an α-Al_2O_3 powder for the matrix are decomposed to mixtures of Ni, am-Al_2O_3,and free-C(+α-Al_2O_3) at 550℃. The decomposed products are prepressed at 0.25-1.72MPa and calcined for synthesis. At 1150℃, Ni_3Al/α-Al_2O_3 powder can be synthesized, This powder is sintered to the density of 93% of the theoretical one. The powder calcined at 1100℃ contained a lot of unreaced Ni. However, the fine size of dispersed NiAl promotes the formation reaction of Ni_3Al as well as densification. High density sintered materials (97%) without remained Ni can be obtained at the adequate preforming pressure (0.74-1.13MPa) of the decomposition products for the calcination.
一般社団法人日本機械学会の論文
2003-09-19