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...

Examples

Embodiment Construction

[0027] MnNi 0.90 Fe 0.10 The preparation of Ge / 35wt% Cu is illustrated as an example, and is only used to illustrate the present invention, not to limit the present invention.

[0028] The invention relates to a metal composite material with negative thermal expansion properties, which is prepared by a solid phase sintering method. The base material is MnNi 0.90 Fe 0.10 Ge, its preparation process is as follows:

[0029] Step 1: According to the stoichiometric ratio of Mn:Fe:Ni:Ge=1:0.90:0.10:1, use an electronic balance to weigh 3.5446g Mn powder, 3.4082g Ni powder, 0.3603g Fe powder and 4.6868g Ge powder and place them in an agate mortar In the middle, fully grind for 1.5h to make the powder mix evenly;

[0030] Step 2: Press the uniformly mixed metal powder into a cylindrical block with a height of about 2.5 mm using a common cylindrical mold with a diameter of 15 mm and a tablet press;

[0031] Step 3: Seal the above-mentioned cylindrical metal block into a vacuum qu...

[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...

Examples

Embodiment Construction

[0027] MnNi 0.90 Fe 0.10 The preparation of Ge / 35wt% Cu is illustrated as an example, and is only used to illustrate the present invention, not to limit the present invention.

[0028] The invention relates to a metal composite material with negative thermal expansion properties, which is prepared by a solid phase sintering method. The base material is MnNi 0.90 Fe 0.10 Ge, its preparation process is as follows:

[0029] Step 1: According to the stoichiometric ratio of Mn:Fe:Ni:Ge=1:0.90:0.10:1, use an electronic balance to weigh 3.5446g Mn powder, 3.4082g Ni powder, 0.3603g Fe powder and 4.6868g Ge powder and place them in an agate mortar In the middle, fully grind for 1.5h to make the powder mix evenly;

[0030] Step 2: Press the uniformly mixed metal powder into a cylindrical block with a height of about 2.5 mm using a common cylindrical mold with a diameter of 15 mm and a tablet press;

[0031] Step 3: Seal the above-mentioned cylindrical metal block into a vacuum qu...

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