Low-expansion phosphate ceramic material and preparation method thereof

Abstract

The invention relates to a low-expansion NZP family ceramic material capable of resisting high temperature and a preparation method thereof, and belongs to the field of low-expansion ceramics. The ceramic material disclosed by the invention is the NZP family solid solution Ca0.5Sr0.5Zr4-xTixP6O24 (CSZTP for short) phosphate ceramic material which can resist high temperature and thermal shock and has a low coefficient of thermal expansion, wherein the average coefficient of thermal expansion of the ceramic material is 2.5-3.2*10<-6> / DEG C when x is greater than 0 and less than or equal to 0.2.An inverted sequence co-precipitation method is adopted to prepare the CSZTP ceramic material; according to the method, the disadvantages of overhigh calcination temperature, long calcination time, difficulty in second phase elimination and uneven ingredient distribution of a solid phase synthesis method are overcome, and meanwhile, the defects of long synthesis period and low yield of a hydrothermal method and a sol-gel method are overcome. The powder body prepared with the method has the advantages of pure phase composition, even powder body granularity, short synthesis time, simple production technology and the like and is convenient in popularization and application. The phosphate ceramic material prepared with the method keeps a low thermal expansion coefficient, also has the advantages of good compactness (relative density is 90% or above), high sintering temperature, good high-temperature performance, good thermal shock resistance and the like, and can be applied to various important high-temperature fields.

Description

technical field [0001] The invention relates to a low-expansion phosphate ceramic material and a preparation method thereof, belonging to the field of low-expansion ceramics. The low-expansion phosphate ceramic material has the advantages of good compactness, high sintering temperature, good high-temperature performance, good thermal shock resistance, etc., and can be applied in many important high-temperature fields. Background technique [0002] The NZP family of phosphate ceramics represents a new family of ceramic materials with the same structure type, and its parent is NaZr 2 (PO 4 ) 3 (abbreviated as NZP). Na + It can be substituted by different cations to produce a series of derivatives of the same structure type, which are collectively called NZP compounds. The NZP family phosphate ceramics further prepared from this compound has low thermal expansion, high temperature resistance and thermal shock resistance, and has great application potential in catalyst carr...

AI Technical Summary

Problems solved by technology

Although Ca 0.5 Sr 0.5 Zr 4 P 6 o 24 Phosphate ceramic materials have a low thermal expansion coefficient, but their density is low. Under normal circumstances, they can only reach 76.69% of the theoretical density, which seriously affects their mechanical properties.

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