Table 4

The thermal expansion coefficient obtained by theoretical and experimental mode.

Material α calculated with Appen formula [1/K] α measured with dilatometer [1/K]
A2 17.96 × 10−6 17.6 × 10−6
A3 18.13 × 10−6 13.4 × 10−6
A5 18.32 × 10−6 14.2 × 10−6

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