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Barium titanate ceramic coating with high compactness

A technology of ceramic coating and barium titanate, which is applied in the field of barium titanate ceramic coating, can solve the problems of limited effect and achieve the effect of improving dielectric properties, dense coating structure and excellent dielectric properties

Inactive Publication Date: 2018-06-12
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Abstract
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  • Application Information

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Problems solved by technology

But this method also has some limitations - for larger cracks, the effect of the current post-heat treatment method is limited

Method used

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  • Barium titanate ceramic coating with high compactness
  • Barium titanate ceramic coating with high compactness
  • Barium titanate ceramic coating with high compactness

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Effect test

preparation example Construction

[0030] The present invention also provides a kind of preparation method of barium titanate ceramic coating, comprises the following steps:

[0031] On the surface of the substrate, the mixed powder is sprayed by supersonic plasma, and the mixed powder includes BaTiO 3 and ZnO to obtain a barium titanate ceramic coating doped with Zn atoms.

[0032] The present invention is based on porcelain-forming BaTiO 3 Powder and plasma spraying techniques to prepare BaTiO with Zn doping 3The coating has a dense structure and excellent dielectric properties; at the same time, it can realize rapid doping and molding of this material. Compared with the traditional hot pressing sintering process, this process is an in-situ doping process, which has the characteristics of high efficiency and low energy consumption.

[0033] Preparation of doped BaTiO as above 3 The main process of ceramic coating can be divided into two steps, the first is the preparation of composite powder, and the plas...

Embodiment 1

[0051] a. Preparation of composite powder:

[0052] 1) A certain mass ratio of ZnO, BaTiO 3 Ceramic powder and PVA (polyvinyl alcohol resin) are mixed by ball milling to prepare a uniform and stable slurry;

[0053] 2) The granulation slurry is made of 30wt% ZnO / BaTiO mixed in a certain ratio 3 Powder, 2wt% PVA and 68wt% water, the uniformly mixed slurry is poured into a centrifugal spray dryer to dry and spheroidize to form spheroidized composite particles.

[0054] 3) The composite particles prepared by granulation were placed in a high-temperature furnace with a constant temperature of 800° C. for 5 hours to achieve the purpose of degumming and densification of the particles. The degummed powder is sieved with a sieve to select particles with a particle size in the range of 50-80 microns.

[0055] b. Preparation of ceramic coating by spraying

[0056] Using the supersonic plasma spraying process, spray the above-mentioned mixed powder after sieving on the substrate, the...

Embodiment 2

[0062]A doped modified barium titanate coating (referred to as BTZ-4) was prepared according to the method of Example 1, except that the proportion of ZnO powder in the mixed powder was 4%.

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Abstract

The invention provides a barium titanate ceramic coating with high compactness. The coating is prepared by spraying mixed powder on the surface of a base body through the supersonic plasma, wherein the mixed powder comprises BaTiO3 and ZnO; and the barium titanate ceramic coating is of a perovskite type crystal structure and is mixed with Zn atoms, and the Zn atoms are mixed in the Ti site insidethe BaTiO3 crystal structure. According to the coating, through adding of ZnO, the melting characteristic of the BaTiO3 composite powder is improved on the one hand, the proportion of unmelted or semi-molten particles during spraying is reduced, so that the generation of coating defects is avoided; on the other hand, ZnO is added and the supersonic plasma spraying technology is adopted, so that the Zn element in-situ mixed barium titanate coating is realized, the Zn atoms diffuse into the BaTiO3 lattice, and the mixing mode can effectively improve the dielectric property of the pure barium titanate coating; and therefore, the BaTiO3 coating is compact in structure and excellent in dielectric property.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a high-density barium titanate ceramic coating. Background technique [0002] Barium titanate (BaTiO 3 ) is a strong dielectric compound material with high dielectric constant and low dielectric loss. It is one of the most widely used materials in electronic ceramics and is known as "the pillar of the electronic ceramics industry". Barium titanate is mainly used in the fields of electronic ceramics, thermistors and photocatalysis, among which barium titanate ceramics are based on barium titanate (BaTiO 3 ) or its solid solution as the main crystal phase of the ceramic material. [0003] Plasma spraying is an effective method for preparing ceramic coatings. In recent years, atmospheric plasma spraying technology has been used to prepare BaTiO 3 , lead titanate (PbTiO 3 ) and related reports on PZT ceramic coatings. Plasma Spraying Technology on BaTiO 3 The applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/11C23C4/134
CPCC23C4/11C23C4/134
Inventor 王海斗邢志国底月兰刘喆马国政董丽虹
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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