Quasicrystalline aluminum heat protection element and thermal sp

Details Quasicrystalline aluminum heat protection element and thermal sp Quasicrystalline aluminum heat protection element and thermal sp

1997-04-01

1999-03-30

Phipps, Margery

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428549, 428 55, 428650, 148437, 148403, 148438, 148439, 148440, 427456, B22F 704, C23C 408

Patent

active

058886613

ABSTRACT:
A composite structure including a substrate and a heat protection element on the substrate, wherein the heat protection element includes a quasicrystalline aluminum alloy of one or a number of quasicrystalline phases which are either quasicrystalline phases in the strict sense, or approximating phases, wherein the quasicrystalline phases exhibit a thermal diffusivity, measured at ambient temperature, lower than 2.5.times.10.sup.-6 m.sup.2 /s, and a thermal diffusivity measured in the temperature range 650.degree.-750.degree. C. which does not exceed the thermal diffusivity measured at ambient temperature by more than a factor of 3, and wherein the quasicrystalline aluminum alloy comprises Al.sub.a Pd.sub.b Mn.sub.c X.sub.d Y.sub.e T.sub.f I.sub.g, wherein X represents at least one metalloid selected from the group consisting of B, C, Si, Ge, P, and S; Y represents at least one metal selected from the group consisting of Fe, Mn, V, Ni, Cr, Zr, Hf, Mo, W, Nb, Ti, Rh, Ru, Re, and Ta; T is at least one rare earth; I represents the unavoidable production impurities; and wherein a+b+c+d+e+f+g=100 atom %; 15.ltoreq.b.ltoreq.25; 6.ltoreq.c.ltoreq.16; 21.ltoreq.b+c+e.ltoreq.45; 0.ltoreq.f.ltoreq.4; 0.ltoreq.g.ltoreq.2; 0.ltoreq.d.ltoreq.5.

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