Zero-expansion material

Abstract

This invention relates to a not expanding material used at minus 140 to 700 deg, belongs to non-metal material region. The invention takes PbO, TiO2, Bi2O3, Fe2O3 and ZnO as precursor, utilize high temperature solid phase method to prepare ( 1 - X - Y) PbTiO3 - xBiFeO3 - yBi ( Zn1 / 2Ti1 / 2) O3 powder body, require the X is not less than 0.0 and not greater than 0.2, and Y is not less than 0.0 and not greater than 0.4; accordingly weigh the PbO, TiO2, Bi2O3, Fe2O3, and ZnO, then ball mill in ethanol solution for 1 to 48 hours for intensive mixing, drying and squashing to make sheet, calcining at 700 to 1300 deg for 1 to 24 hours, the offspring after calcining ball mill at ethanol solution for 1 to 48 hours, then drying again and squashing for sheet, calcining at 800 to 1300 deg for 1 to 48 hours, cooling, the finished product after grinding is zero expanding material PbTiO3 - BiFeO3 - Bi ( Zn1 / 2Ti1 / 2) O3.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a zero-expansion material that can be used in the range of -140 to 700°C Background technique [0002] Zero-expansion materials have high research and practical application value, and the volume of such materials does not change or changes very slightly as the temperature changes. The zero-expansion material has significant thermal shock resistance because thermal expansion is less affected by temperature. Such materials are widely distributed, from daily necessities to aerospace fields. At present, most of the reported materials are composite materials, such as: ZrW 2 o 8 Matrix composite material (ZrO 2 / ZrW 2 o 8 Composite material, ZrW 2 o 8 / cement, etc.), however, this type of composite material also has its own weaknesses, such as complex manufacturing process and low mechanical strength. The literature Nature, 2003, 425:702 reported that YbGaGe has...

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Problems solved by technology

At present, most of the reported materials are composite materials, such as: ZrW 2 o 8 Matrix composite material (ZrO 2 / ZrW 2 o 8 Composite material, ZrW 2 o 8 / cement, etc.), however, this type of composite material also has its own weaknesses, such as complex manufacturing process, low mechanical strength and other issues

The literature Nature, 2003, 425:702 reports that YbGaGe has zero expansion properties, but the temperature range is narrow (-173~25°C); the literature J.Am.Chem.Soc., 2004, 126:15390 reports that it has zero expansion behavior The material Fe[Co(CN) 6 ], the average bulk thermal expansion coefficient is -0.44×10 -5 ℃ -1 , the same narrow temperature range (-263 ~ 25 ℃)

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