Patent ID: 6183887
Filing Date: 2001-02-06
Classification: C22C,C23C,Y02T,Y10T

Abstract:
A composite structure comprising a substrate and a heat protection element on the substrate, wherein the heat protection element consists essentially of a quasicrystalline aluminum alloy consisting essentially of one or a number of quasicrystalline phases which are either quasicrystalline phases in the strict sense, or approximating phases, wherein said 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 650-750.degree. C. which does not exceed the thermal diffusivity measured at ambient temperature by more than a factor of 3, and wherein said quasicrystalline aluminum alloy consists essentially of:Al.sub.a Cu.sub.b Co.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, and Re; T represents at least one rare earth; I represents unavoidable production impurities; a+b+c+d+e+f+g=100 atom %; 14.ltoreq.b.ltoreq.27; 8.ltoreq.c.ltoreq.24; 28.ltoreq.b+c+e.ltoreq.45; 0.ltoreq.f.ltoreq.4; 0.ltoreq.d.ltoreq.5; 0.ltoreq.g.ltoreq.2; and e is greater than zero,wherein the heat protection element on the substrate comprises at least 80% by volume of at least one quasicrystalline phase.