Samples of Invar. Also known as FeNi36, it is an iron-nickel alloy notable for its lack of expansion or contraction with temperature changes. Copyright : Public Domain
Schematic of negative thermal expansion in a flexible network. Copyright : Dr. K. Takenaka, published in Sci. Technol. Adv. Mater.
Takenaka notes that, “NTE materials will expand our capability of thermal-expansion control, opening a new paradigm of materials science and technology thermal-expansion-adjustable composites”. One challenge facing the scientist is that the addition of NTE materials to composites leads to undesirable instabilities at interfaces. New methods for producing stable interfaces between the host composite and NTE compensators are of critical importance. Nevertheless, the so-called ‘one-component’ materials—such as manganese antiperovskites, zirconium vanadates, and hafnium tungstates—exhibiting negligible thermal expansion offer a promising route towards achieving this goal.
Mikiko Tanifuji | Research asia research news
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