A kind of negative thermal expansion material zrscmo2vo12 and its solid phase sintering synthesis method

Abstract

The invention belongs to the technical field of inorganic non-metallic materials, and particularly discloses a novel negative thermal expansion material ZrScMo2VO12 and a solid-phase sintering synthesis method thereof. In terms of molar ratio, weigh raw materials according to zirconium dioxide ZrO2: scandium trioxide Sc2O3: molybdenum trioxide MoO3: vanadium pentoxide V2O5=2:1:4:1, grind and mix evenly, and directly or The target product ZrScMo2VO12 is obtained by sintering after pressing into tablets, and natural cooling to obtain the target product ZrScMo2VO12; wherein, the sintering conditions are as follows: temperature is 600-800°C, time is 30min-5h, pressure is normal pressure, and the atmosphere is air. The new negative thermal expansion material ZrScMo2VO12 of the present invention has stable negative thermal expansion properties in the range of room temperature (RT)-600 ° C, and has no phase change, and has engineering application value; the present invention can be sintered at one time, and the reaction process is simple. Medium sintering at 600-800°C, sintering time of 30min-5h, full reaction at high temperature, high purity products, suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a new negative thermal expansion material ZrScMo 2 VO 12 and its solid-phase sintering synthesis method. Background technique [0002] Most materials in nature have the property of thermal expansion and cold contraction. When the temperature changes sharply or changes greatly, the thermal stress caused by the difference in thermal expansion coefficient of different materials often causes the performance index of the material or device to deteriorate. Negative thermal expansion materials The emergence of thermal expansion provides opportunities and possibilities to solve this problem. Different from the "thermal expansion and contraction" of traditional materials, the average linear expansion coefficient or volume expansion coefficient of negative thermal expansion materials in a certain temperature range is negative. The material has huge po...

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Problems solved by technology

But so far, the types of negative thermal expansion materials found are very limited, and the research on this type of materials is not perfect, and has not been applied on a large scale so far, and there are still many problems to be solved, such as the selection of raw materials, phase change, and water absorption. Problems, improvement of mechanical properties, complex production process, A 2 m 3 o 12 The series must change from a monoclinic phase to an orthorhombic phase before showing negative thermal expansion properties, etc.

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