A ceramic material with adjustable negative dielectric properties and its preparation method

Abstract

The invention discloses a ceramic material with adjustable negative dielectric properties and a preparation method thereof. The method comprises the following steps: Step 1: Mixing materials: 80% to 20% of titanium nitride powder is used in mass percentage Mix with 20%-80% titanium oxide powder as raw material to obtain a mixed powder; Step 2: Granulating and compacting: add a binder to the mixed powder, grind and granulate, and then press to obtain a green body ; Step 3: sintering: placing the green body in a protective atmosphere for sintering to obtain a ceramic material with adjustable negative dielectric properties. It is difficult to sinter pure titanium nitride ceramics, and the absolute value of its negative dielectric constant is relatively large. The key of the present invention is to introduce titanium oxide as a raw material. On the one hand, it uses its solid solution reaction with titanium nitride at high temperature to promote Sintering, on the other hand, uses the titanium oxynitride solid solution produced by the solid solution reaction to regulate the value of the negative dielectric constant. The preparation cost of the invention is low, the operation is simple, and the performance treatment is considerable.

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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