Favorite disproportionately productive science?
No.11456265 ViewReplyOriginalReport
Quoted By: >>11456320 >>11456729
My favorite is the alloy invar.
>Common grades of Invar have a coefficient of thermal expansion (denoted ?, and measured between 20 °C and 100 °C) of about 1.2 × 10?6 K?1 (1.2 ppm/°C), while ordinary steels have values of around 11–15 ppm. Extra-pure grades (<0.1% Co) can readily produce values as low as 0.62–0.65 ppm/°C. Some formulations display negative thermal expansion (NTE) characteristics.
>Still no definitive explanation on why this particular alloy is so resistant, but it just is
>Common grades of Invar have a coefficient of thermal expansion (denoted ?, and measured between 20 °C and 100 °C) of about 1.2 × 10?6 K?1 (1.2 ppm/°C), while ordinary steels have values of around 11–15 ppm. Extra-pure grades (<0.1% Co) can readily produce values as low as 0.62–0.65 ppm/°C. Some formulations display negative thermal expansion (NTE) characteristics.
>Still no definitive explanation on why this particular alloy is so resistant, but it just is
