Ceramic material with adjustable and controllable negative dielectric performance and preparation method thereof

Abstract

The invention discloses a ceramic material with adjustable and controllable negative dielectric performance and a preparation method thereof. The method comprises the following steps of 1, material mixing: using 80 to 20 percent of titanium nitride powder and 20 to 80 percent of titanium oxide powder metered in percentage by mass as raw materials to obtain mixed powder; 2, granulation and blank pressing: adding bonding agents into the mixed powder, performing grinding and granulation; next, performing pressing and shaping to obtain a blank body; 3, sintering: putting the blank body into protection atmosphere to be sintered to obtain the ceramic material with the adjustable and controllable negative dielectric performance. The sintering of the pure titanium nitride ceramic is more difficult; the absolute value of the negative dielectric constant is greater. The ceramic material is mainly characterized in that the titanium oxide is introduced to be used as raw materials; on one hand, thetitanium oxide takes solid dissolution reaction with the titanium nitride at high temperature to promote sintering; on the other hand, the titanium oxynitride soluble solids generated in the solid dissolution reaction is used for regulating and controlling the value of the negative dielectric constant. The ceramic material has the advantages that the preparation cost is lower; the operation is simple; the performance treatment is visible.

Description

technical field [0001] The invention relates to the field of metamaterials with negative dielectric constant, in particular to a ceramic material with adjustable negative dielectric properties and a preparation method thereof. Background technique [0002] Dielectric constant and magnetic permeability are two basic physical performance parameters that describe the macroscopic electromagnetic properties of materials. Different application fields have different requirements for the electromagnetic parameters of materials, so they need to be effectively regulated to meet the needs of materials in different fields. field application requirements. Controlling the dielectric constant of materials is also an important research direction of functional materials, such as high dielectric constant materials, low dielectric constant materials, and lossy dielectric materials of different sizes. The general definition of dielectric constant refers to the ability of a substance to generat...

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Problems solved by technology

In addition to array-type metamaterials, tunable negative dielectric properties can be achieved, and other literatures have reported that cermets with over-percolation threshold can be used to obtain tunable negative dielectric properties. However, due to the negative dielectric value and eddy current loss of metals It is relatively large and the metal has the characteristics of high-frequency cut-off, so in a sense, it limits the development of cermets; there are also reports in the literature that the addition of conductive carbon materials to the polymer matrix can also achieve effective regulation of the negative dielectric constant. , but polymer-based composites are difficult to use in harsh environments such as high temperature and high pressure

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