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Method for preparing intermediate-temperature microwave dielectric ceramic material

A microwave dielectric ceramic, medium-temperature technology, applied in ceramics, inorganic insulators, etc., can solve the problems of high preparation cost, restrict product sales market, etc., and achieve the effects of low microwave dielectric loss, energy-saving preparation method and low price.

Active Publication Date: 2015-07-01
YUNNAN INFINE NEO MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the rapid development of the electronic information industry, most manufacturers have also developed materials that can meet the needs of products, but most microwave dielectric materials are still made of chemical raw materials, synthesized through high-temperature solid-state reactions, with the future modularization of electronic components As well as the surplus of electronic terminal products, the price and cost competition will inevitably become more intense, and the expensive raw material prices lead to excessively high preparation costs, which limits the sales market of products

Method used

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  • Method for preparing intermediate-temperature microwave dielectric ceramic material

Examples

Experimental program
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Effect test

example 1

[0036] Weigh the treated kaolin 91.85% by weight percentage; Modifier MgO, 3%; CaO, 2%; ZnO, 0.5%; B 2 o 3 , 2.5%; SnO 2, 0.15% was added to the ball mill tank, and the planetary ball mill was used to mix and grind for 12 hours. The grinding balls were zirconia balls, and the ball milling medium was absolute ethanol. The mass ratio of grinding balls: material: absolute ethanol was 3:1:1 , the speed of the ball mill is 300rpm. After ball milling for 12 hours, add 5wt% polyvinyl butyral (PVB) binder with a concentration of 10wt%, ball mill for another 1.5 hours, mix evenly, granulate, pass through a 100-mesh sieve, and press into tablets at 16Mpa. Heat at 2°C / min to 500°C for 1 hour for debinding, 3°C / min to 900°C, then 2°C / min to 1200°C for 30 minutes, cool to room temperature with the furnace, and take out the sample Grinding and polishing, using agilent4991A to measure the dielectric constant within the frequency range of 1MHz to 3 GHz is 5.9, the dielectric loss is 0.0017...

example 2

[0038] Weigh the treated kaolin 91.2% by weight percentage; Modifier MgO, 3.5%; CaO, 1.5%; ZnO, 0.6%; B 2 o 3 , 3%; SnO 2 , 0.2% into the ball mill tank, and use a planetary ball mill to mix and grind for 14 hours. The balls are zirconia balls, and the ball milling medium is absolute ethanol. The mass ratio of grinding balls: material: absolute ethanol is 3:1:1.2 , the ball mill rotating speed is 200rpm. After 14 hours of ball milling, add 3wt% polyvinyl butyral (PVB) binder with a concentration of 10%, ball mill for another 2 hours, mix evenly, granulate, pass through a 100-mesh sieve, and press into tablets at 17Mpa. Heat at 2°C / min to 500°C for 2 hours for debinding, rise at 3°C / min to 900°C, then rise to 1200°C at 1°C / min for 30 minutes, cool to room temperature with the furnace, and take out the sample Grinding and polishing, using agilent4991A to measure the dielectric constant within the frequency range of 1MHz to 3GHz is 5.7, the dielectric loss is 0.0019, the tempe...

example 3

[0040] Weigh the treated kaolin 90.6% by weight percentage; Modifier MgO, 2%; CaO, 3%; ZnO, 0.8%; B 2 o 3 , 3.5%; SnO 2 , 0.1% is added in the ball mill tank, and the planetary ball mill is used for 12 hours to mix and grind, the balls are zirconia balls, the ball milling medium is absolute ethanol, and the mass ratio of balls: material: absolute ethanol is 4:1:1.2 , the speed of the ball mill is 300rpm. After ball milling for 12 hours, add 5wt% polyvinyl butyral (PVB) binder with a concentration of 15wt%, ball mill for another 2 hours, mix evenly, granulate, pass through a 100-mesh sieve, and press into tablets at 16Mpa. Heat at 2°C / min to 500°C for 1 hour for debinding, rise at 4°C / min to 900°C, then rise to 1250°C at 2°C / min and hold for 30 minutes, cool to room temperature with the furnace, and take out the sample Grinding and polishing, using agilent4991A to measure the dielectric constant within the frequency range of 1MHz to 3GHz is 6.2, the dielectric loss is 0.0018...

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Abstract

The invention discloses a method for preparing an intermediate-temperature microwave dielectric ceramic material. The method comprises the steps: step S1, washing kaolin by water, removing impurities, and drying to obtain kaolin powder; step S2, based on percentage by weight, adding 87-93.5 percent of the kaolin powder, 3-5 percent of MgO, 1-3 percent of CaO, 0.5-1 percent of ZnO, 2-3.5 percent of B2O3 and 0-0.5 percent of SnO2 into a ball-milling tank, and carrying out ball milling for 12-16 hours by using a planetary ball mill to uniformly mix and finely mill the materials, wherein the MgO, the CaO, the ZnO, the B2O3 and the SnO2 form a modifying agent. Due to adoption of conventional equipment, the intermediate-temperature microwave dielectric ceramic material is formed by once firing without roasting and melting, and by introduction of the modifying agent, the temperature is reduced from the primary 1400-1450 degrees centigrade to 1200-1250 degrees centigrade, thus the production cost is lowered, and the requirements on energy conservation and emission reduction are satisfied. The intermediate-temperature microwave dielectric ceramic material disclosed by the invention has a dielectric constant within 5.7-6.5@1MHz-3GHz, and simultaneously has low microwave dielectric loss and a small temperature coefficient of resonance frequency.

Description

technical field [0001] The invention uses a solid-phase synthesis method to prepare a medium-temperature microwave dielectric ceramic material, and belongs to the technology for preparing endogenous ceramic powder in the field of medium-temperature microwave dielectric materials. Background technique [0002] Kaolin is the collective name of kaolinite group minerals. It is composed of four subgroup minerals (kaolinite, dickite, pearlite, halloysite). It is an important non-metallic mineral resource. Octahedral structure, surface has weak acidity, pure kaolin has whiteness and brightness, good plasticity and high cohesion, excellent electrical insulation, good resistance to acid solubility, strong ion adsorption and ion exchange properties, as well as good sinterability and high refractoriness. The primary particles of natural kaolin crystals are mainly composed of kaolinite minerals such as micro flakes, tubes, and laminations less than 2 μm. The chemical composition of ka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B33/13
Inventor 邢孟江
Owner YUNNAN INFINE NEO MATERIAL
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