Natural flaky microwave absorbent and production process thereof

A technology of microwave absorber and production process, which is applied in other chemical processes, metal processing equipment, electrical components, etc., can solve the problems of narrow absorption band range, non-environmental protection in the production process, and large ferrite specificity, and achieve excellent microwave absorption Performance, low production cost, and variety of effects

Inactive Publication Date: 2021-03-26
郑州启杉防腐防护新材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ferrite has a large specificity and a narrow absorption band, and is gradually replaced by carbonyl iron powder; while carbonyl iron powder has two types of spherical particles and machined flake structures, spherical carbonyl iron powder is far inferior to machined flake carbonyl iron However, the mechanically processed flaky carbonyl iron powder has defects such as poor lamellar structure and uneven thickness, very high production cost, and the production process is not environmentally friendly.

Method used

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  • Natural flaky microwave absorbent and production process thereof

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Comparison scheme
Effect test

Embodiment 1

[0054] A kind of natural flaky microwave absorber and production technology thereof, comprises the following steps:

[0055] 1. Prepare dispersion slurry. Mica iron oxide powder with a particle size of 200 mesh or more and an iron oxide content of >98% is used as the main raw material, and water is added to prepare a suspension with a solid content of 27.5%, and then 2.75% of an aqueous dispersant is added to form a dispersion slurry.

[0056] 2. Mechanical grinding. Put the prepared dispersion slurry into a high-speed sand mill, and at the same time add zirconium beads with a particle size of 1.25 mm, and perform mechanical grinding at a speed of 4000 rpm for 35 minutes to obtain a mica iron oxide suspension with a particle size of less than 10 μm.

[0057] 3. Mechanical stripping. Dilute the micaceous iron oxide suspension obtained by the above-mentioned mechanical grinding with water to form a suspension with a solid content of 12.5%, then add it to a mechanical stripping...

Embodiment 2

[0075] A kind of natural flaky microwave absorber and production technology thereof, comprises the following steps:

[0076] 1. Prepare dispersion slurry. Mica iron oxide powder with a particle size of 200 mesh or more and an iron oxide content of >98% is used as the main raw material, and water is added to prepare a suspension with a solid content of 5%, and then 0.5% of an aqueous dispersant is added to form a dispersion slurry.

[0077] 2. Mechanical grinding. Put the prepared dispersion slurry into a high-speed sand mill, and at the same time add zirconium beads with a particle size of 0.5 mm, and perform mechanical grinding at a speed of 2000 rpm for 60 minutes to obtain a mica iron oxide suspension with a particle size of less than 10 μm.

[0078] 3. Mechanical stripping. Dilute the micaceous iron oxide suspension obtained by the above mechanical grinding with water to form a suspension with a solid content of 5%, then add it to a mechanical stripping device, and perfo...

Embodiment 3

[0096] A kind of natural flaky microwave absorber and production technology thereof, comprises the following steps:

[0097] 1. Prepare dispersion slurry. Mica iron oxide powder with a particle size of 200 mesh or more and an iron oxide content > 98% is used as the main raw material, and water is added to prepare a suspension with a solid content of 50%, and then 5% of an aqueous dispersant is added to form a dispersion slurry.

[0098] 2. Mechanical grinding. Put the prepared dispersion slurry into a high-speed sand mill, and at the same time add zirconium beads with a particle size of 2 mm, and perform mechanical grinding at a speed of 6000 rpm for 10 minutes to obtain a mica iron oxide suspension with a particle size of <10 μm.

[0099] 3. Mechanical stripping. Dilute the micaceous iron oxide suspension obtained by the above mechanical grinding with water to form a suspension with a solid content of 20%, then add it to a mechanical stripping device, and perform mechanical...

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Abstract

The invention discloses a natural flaky microwave absorbent and a production process thereof. The production process comprises the following steps: 1, preparation of dispersion slurry; 2, mechanical grinding; 3, mechanical stripping; 4, primary centrifugal dehydration; 5, microwave drying; 6, preparation of an additive; 7, hydrogen reduction; 8, surface passivation / oxidation; 9, dehydrating, washing and drying; 10, secondary centrifugal dehydration; 11, microwave drying; 12, preparation of an additive; 13, hydrogen reduction; 14, surface passivation / oxidation; and 15, dehydrating, washing anddrying. The product disclosed by the invention is mainly applied to the fields of wave-absorbing materials, electromagnetic wave shielding materials and other new materials, is particularly applied tocamouflage coating materials of military weaponry, and is a core material related to national defense safety guarantee. The main raw material mica iron oxide powder is high-grade flaky iron oxide powder with the purity of more than 98%, wherein the high-grade flaky iron oxide powder is obtained by crushing, grinding, magnetic separation and flotation of natural flaky iron ore existing in China.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave shielding and wave-absorbing materials, and specifically relates to a natural sheet-shaped microwave absorber and its production process. After the process is completed, the products are mainly used in the fields of new materials such as wave-absorbing materials and electromagnetic wave shielding materials, especially in camouflage coating materials for military weapons and equipment, which are core materials related to national defense security. Background technique [0002] The microwave and electromagnetic wave absorbers used in absorbing materials mainly include the following types: 1. Ferrite series, which are divided into two types: spinel type and ferrite containing large-sized divalent metal ions: ①Stone type ferrite: Such as Mn-Zn, Ni-Zn, Li-Ti and other series, widely used. But its ε and μ are small, it is difficult to satisfy |μ r -ε r ∣The principle of being as small as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00B22F1/00B22F9/22
CPCC09K3/00H05K9/0081B22F9/22B22F2304/10B22F2304/058B22F1/068B22F1/145
Inventor 贾进营王二永胡永庆范海玲
Owner 郑州启杉防腐防护新材料技术研究院
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