Ceramic Zirconium Tungstate Composite
Thermal expansion and contraction are common physical phenomena. However, in industrial practice, it is found that zirconium tungstate is a heterogeneous species.
It is shown by the "heat shrinkable cold expansion". This phenomenon is called "negative thermal expansion" of zirconium tungstate. It should not be underestimated in zirconium tungstate. It can be used in industrial production.
The results show that the zirconium tungstate ZrW2O8 has a stable negative thermal expansion performance in the range of 0.3 to 1050.0K in the temperature range, negative thermal expansion coefficient alpha can reach -9 * 10-6K-1, and is isotropic. Therefore, zirconium tungstate can be used alone as a heat shrinkable material, and can also be mixed with other materials to form composite material.
The material obtained by the composite process of ceramic and zirconium tungstate is called zirconium tungstate composite based on ceramic. The ceramic based zirconium tungstate composite is an important structural and functional material. Compared with the metal based zirconium tungstate composite, its thermal expansion coefficient is more compatible with the matrix and easier to combine.
Ceramic matrix composites are prepared by mixing ZrW2O8 powders with a certain mass of ZrO2 or other materials, in sealed platinum crucible, calcined for 2 hours at 1180 °C, cooled by liquid nitrogen, and finally obtained low thermal expansion ZrO2 - ZrW2O8 material, some scholars also compare ZrO2 and WO3 at a certain mass ratio, ceramic based zirconium tungstate composite was prepared by high pressure and high temperature ball milling. But in general, the above methods need to be improved, and there is not yet a perfect production plan.
In recent years, the study of ceramic based zirconium tungstate negative thermal expansion materials has become a hot topic in the world. The biggest characteristic of this kind of materials can be precise control of material expansion coefficient, the coefficient of thermal expansion of a material is controlled as a set positive value, negative value, or zero. For example, the ceramic based zirconium tungstate composite material and the regular positive thermal expansion material are made into composite materials in a certain manner and proportion, the utility model can be used for the precise optical focusing and optical path collimation of special glass manufacture, telescope, laser equipment and optical communication system, so that the utility model is not affected by temperature fluctuation, and has the advantages of stable performance and long service life.
At present, there is no better solution to the cost of zirconium tungstate. Therefore, the ceramic based zirconium tungstate composite material is mostly applied in the high-end technology field. But the current research of zirconium tungstate is still in the initial stage, improving costs is only a matter of time. In the near future, products made from ceramic based zirconium tungstate materials may soon permeate all aspects of our lives.
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