Preparation method for ZnNb2O6 microwave dielectric ceramic powder

Abstract

The invention discloses a preparation method for ZnNb2O6 microwave dielectric ceramic powder. The preparation method comprises the steps of precursor preparation, a precipitation reaction, a hydrothermal reaction and pumping-filtration drying. Through the preparation method for the ZnNb2O6 microwave dielectric ceramic powder, the resultant temperature of the ZnNb2O6 microwave dielectric ceramic powder can be lowered, ultramicro ZnNb2O6 ceramic powder with excellent microcosmic properties can be obtained, and then the dielectric properties of microwave dielectric ceramic can be improved.

Description

technical field [0001] The invention relates to a preparation method, in particular to a ZnNb 2 o 6 A method for preparing microwave dielectric ceramic powder. Background technique [0002] ZnNb 2 o 6 It is an important microwave dielectric material with excellent dielectric properties (ε r =25, Q×f=83700GHz, τ f =-56×10 -6 / °C), thus, it is widely used in many fields such as mobile communication, satellite TV broadcast communication, radar, satellite positioning and navigation system with a frequency of 300MHz ~ 40GHz. [0003] ZnNb 2 o 6 The inherent sintering temperature of ceramics is above 1250°C, and the high temperature of traditional solid-state sintering will cause the volatilization of zinc element, thereby deteriorating the dielectric properties of ceramics. At the same time, for LTCC technology, ZnNb 2 o 6 The higher sintering temperature of ceramics cannot satisfy the co-firing with lower melting point metals Ag (961°C) and Cu (1064°C), so it is very i...

AI Technical Summary

Problems solved by technology

However, the traditional method of solid phase addition will deteriorate the dielectric properties of ceramics while reducing the sintering temperature

This is because the traditional solid-phase addition is to mix the ceramic powder and the sintering aid mechanically, which makes the sintering aid mixed unevenly, thereby increasing the amount of the sintering aid

[0005] Furthermore, the dielectric properties of sintering aids are poor, so too much sintering aids will deteriorate the dielectric properties of ceramics

Specifically, (1) a chemical reaction occurs between the main crystal phase of the material and the glass phase to produce a second phase, resulting in a decrease in the content of the main crystal phase or the formation of an impurity phase; (2) the glass phase exists inside the material, and Makes its intrinsic loss increase; (3) The generation of lattice defects

The hydrothermal method in the wet chemical method can reduce the sintering temperature to a certain extent, but the powder generation rate is usually relatively low, and the agglomeration is serious, which affects the performance of smart components

Images