Patent ID: 7501365

Claim:
A composite component comprising at least a first component made of a lithium-aluminosilicate glass ceramic comprising at least 70 vol.-%, of keatite mixed crystals, the coefficient of thermal expansion of the component being between 1.5×10 −6 /K and 3×10 −6 /K in the temperature range of 20° C. to 700° C., and comprising (in wt.-%): SiO 2 : 50-75 Al 2 O 3 : 17-30 Li 2 O: 2-8 B 2 O 3: 0-5 P 2 O 5: 0-15 SnO 2 + ZrO 2 + TiO 2 : 0.1-7 Na 2 O + K 2 O + Cs 2 O: 0-6 CaO + MgO + SrO + BaO + ZnO: 0-8 refining agents: 0-3 coloring oxides and other oxides: 0-5 and further comprising at least a second component of an iron/nickel alloy having a coefficient of thermal expansion of 3×10 −6 /K at the most between 0° C. and 200° C.