A kind of alloy material with negative thermal expansion property and preparation method thereof

Abstract

A majority of materials in the natural world have positive thermal expansion properties, namely, within the certain temperature range, with increasing of the temperature, the materials are expanded in one direction or multiple directions. In actual engineering application, the great influence on the stability, accuracy, the service life and the like of engineering components is achieved. A negative thermal expansion material is a good expansive retarder which can be used for reconciling positive thermal expansion, improving the accuracy of the engineering components, prolonging the service life of the engineering components and the like. The invention provides a solid metal alloy material with the negative thermal expansion property and a preparation method thereof, the solid metal alloy material can serve as an expansive retarder material for using, the alloy material has the negative thermal expansion property within the certain temperature interval, and the general chemical formula of the alloy material is MnNi(1-x)FexGe / Cu or Mn(1-y)FeyNiGe / Cu (0<=x<=1, and 0<=y<=1), for example, the MnNi0.90Fe0.10Ge / 35wt% Cu alloy material has the negative thermal expansion property under the condition of 176K<T<247K, and the thermal expansion coefficient of the alloy material is -56.7357*10<-6>K<-1>.

Description

[0001] Technical field: [0002] The invention provides a solid metal alloy material with negative thermal expansion properties and a preparation method thereof, which can be used as an expansion inhibitor material and has potential application value in the fields of aerospace, precision instruments and the like. [0003] Background technique: [0004] Most materials in nature have positive thermal expansion properties, that is, within a certain temperature range, as the temperature rises, the material expands in a certain direction or in multiple directions. In practical engineering applications, it has a great influence on the stability, precision and service life of engineering components. Negative thermal expansion material is a good expansion inhibitor, which can be used to reconcile positive thermal expansion, improve the precision and service life of engineering components, etc. [0005] So far, scientists have discovered negative thermal expansion properties in materia...

AI Technical Summary

Problems solved by technology

Most ferroelectric materials with negative expansion properties have a wide temperature range for negative thermal expansion, but the expansion coefficient is very small, such as Pb(Ti 0.75 Zr 0.25 )O 3 The temperature range where negative thermal expansion occurs is RT-728K, and its linear expansion coefficient α l -1.1×10 -6 K -1 ; In magnetic materials, although anti-perovskite structure compounds have a large expansion coefficient, the temperature range where negative thermal expansion occurs is relatively narrow, or because it is higher / lower than the actual use temperature range, such as Mn 3 Zn 0.5 sn 0.5 The linear expansion coefficient of the N compound reaches -45×10 -6 K -1 , but its negative thermal expansion temperature is higher than 100°C, which is 381–428K; Mn 3 Zn 0.3 sn 0.7 The negative expansion temperature range of N reaches up to 447K, but its negative expansion temperature range is only 10K; Mn 3 The temperature range of negative thermal expansion effect of GaN compound is 348K

These severely limit its performance and application

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