Sintering synthesis method for nanometer negative expansion ceramic Zr2(WO4)(PO4)2

Abstract

The invention discloses a sintering synthesis method for nanometer negative expansion ceramic Zr2(WO4)(PO4)2, which belongs to the field of inorganic non-metallic materials. According to the invention, ZrO2, WO3 and P2O5 are used as raw materials; the raw materials are weighed according to a stoichiometric ratio of Zr to W to P in the target product Zr2(WO4)(PO4)2 of 2: 1: 2; MgO which accounts for 0.5 to 1.5% of the total weight of the raw materials of ZrO2, WO3 and P2O5 is added, MgO and the raw materials are ground and uniformly mixed, then are dried, and then are ground and uniformly mixed again, and an obtained mixture is subjected to direct one-step sintering synthesis or to one-step sintering synthesis after performing, and a product obtained after sintering synthesis is quenched in the air so as to obtain the target product; wherein, sintering parameters are: temperature 1350 to 1450 DEG C, time 2 to 20 min. The invention has the advantages of a simple process, no pollution, a fast sintering speed and suitability for large scale production; Zr2(WO4)(PO4)2 has an average particle size in order of magnitude of hundreds of nanometers.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a nanometer negative expansion ceramic Zr 2 (WO 4 )(PO 4 ) 2 sintering synthesis method. Background technique [0002] In engineering materials, different materials must be used to meet the multifunctional requirements, but when the temperature changes, the thermal stress due to the difference in thermal expansion coefficient often causes performance degradation, temporary or permanent failure, shedding and fracture of materials or devices, etc. A series of problems, such as the drift of the central wavelength of the fiber Bragg grating with temperature, the systematic error of the thermal dilatometer, the degradation of the imaging quality caused by the change of the focal length of the space telescope with the temperature, the copper foil on the printed circuit board is detached due to heat, and the output beam of the laser due to the thermal lens effect Dive...

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Problems solved by technology

Use ZrO 2 、WO 3 and NH 4 h 2 PO 4 or (NH 4 ) 2 HPO 4 Preparation of negative thermal expansion ceramic Zr 2 (WO 4 )(PO 4 ) 2 , but the NH released during pre-sintering at 900 °C 3 It will pollute the environment, and the sintering time at high temperature 1250°C is longer (8 h), and the final product density is lower

Due to the long sintering time at high temperature, the crystal growth particles are larger and the pores are more, resulting in a lower product density, which seriously affects the Zr 2 (WO 4 )(PO 4 ) 2 practical application of

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