Thermal expansion is a common problem in many fields, such as mechanical, electronic, optical and structural materials.
Process for Preparing Aluminum Based Zirconium Tungstate Composite
Aluminum and zirconium tungstate are negative thermal expansion materials. Aluminum is a metal type negative thermal expansion material, which is characterized by excellent conductivity and thermal conductivity, and the material price is relatively cheap, it can deal with the general application. But in the high temperature and cold environment, but its negative thermal expansion is less than zirconium tungstate, but zirconium tungstate production cost is higher, the performance and price trade-off dilemma.
Fortunately, zirconium tungstate has good compatibility and can be used to form composite particles with aluminum. The traditional preparation technology of aluminum based zirconium tungstate composite material is heating sintering and pressing.
Preparation process of aluminum based zirconium tungstate composite: 1. The zirconium tungstate powder was pressed into a preform with a diameter of 45 mm under 30 MPa pressure, and then preheated in 500~550 °C heat-resistant steel mould for 1 h.; 2. 6013 aluminum alloy were smelted at Al-1%Mg-2.4%Cu-2.4%Si 800~900 (mass fraction) and melted in the heat resisting steel mould after degassing and slag removal; 3. In the hydraulic press through the die on the aluminum liquid pressure, the pressure of 377MPa, 30 seconds after the pressure relief, after cooling off the system made of zirconium tungstate / 6013Al composite material.
The results show that aluminum based zirconium tungstate composite has lower thermal expansion coefficient and more stable performance than single aluminum alloy, the aluminum base zirconium tungstate composite can greatly enhance the thermal shock resistance of the material, and maintain the dimensional stability and the service life of the material when it is used in the variable temperature situation, that is, the performance of zirconium tungstate is close to that of zirconium tungstate, and it has the advantage of cheap and easy access to aluminum.
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