Post by someusername6 on Jul 15, 2017 20:26:39 GMT
... or, if we remove the commercial name, Low Thermal Expansion Glass. Turns out that we know how to engineer materials to have a very, very small CTE (~ 2e-8 K-1 on the highest graded variety). This is mostly used within the context of building large telescope mirrors, but maybe it will fit somewhere in an anti-laser armor scheme? (Also it is actually a glass-ceramic composite).
Material Low Thermal Expansion Glass Elements O Si Al Li P Ti Mg Zn Zr K Na As ElementCount .6292 .1777 .1260 .0303 .0171 .0054 .0046 .0032 .0027 .0016 .0012 .0009 Density_kg__m3 2530 YieldStrength_MPa 57 UltimateTensileStrength_MPa 57 YoungsModulus_GPa 90.3 ShearModulus_GPa 36.32 MeltingPoint_K 873 SpecificHeat_J__kg_K 820 ThermalConductivity_W__m_K 1.63 ThermalExpansion__K 2e-8 Resistivity_Ohm_m 2.6e15 DielectricStrength_MV__m 30 RelativePermittivity 7.4 RefractiveIndex BK7 RoughnessCoefficient 0.1
Properties are mostly taken from commercial papers on this glass and matweb. The composition is a mix of various oxides (SiO2, Al2O3, P2O5, Li2O, TiO2, ZrO2, ZnO, MgO, As2O3, K2O, Na2O) from the lecture notes linked.
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