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Li2MoO4-Mg2SiO4-based composite ceramic microwave material and preparation method thereof

A technology of composite ceramics and microwave materials, which is applied in the field of microwave ceramic materials and industrial energy saving and emission reduction, can solve problems such as hindering integration and consuming energy, and achieve the effects of energy saving, low cost of preparation, and lower sintering temperature

Active Publication Date: 2019-08-30
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they are usually fabricated at high temperatures of 1000°C–1500°C, which consumes a lot of energy and hampers the possibility of integration

Method used

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  • Li2MoO4-Mg2SiO4-based composite ceramic microwave material and preparation method thereof
  • Li2MoO4-Mg2SiO4-based composite ceramic microwave material and preparation method thereof
  • Li2MoO4-Mg2SiO4-based composite ceramic microwave material and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0027] Example 1: Preparation of 95wt% Li 2 MoO 4 -5wt% Mg 2 SiO 4 Composite Ceramic Microwave Materials

[0028] Weigh successively MgO (purity 99.99%) 22.9199g, SiO 2 (purity 99.99%) 26.1825g. Place the above material in isopropanol and ball mill for 4 hours to obtain a slurry-like raw material; pour out the ball-milled slurry, put it in an oven and dry it to a constant weight at 80°C to 100°C to obtain a dry mixture; The constant weight mixture obtained in the previous step was placed in a high-temperature furnace and pre-fired for 4 hours at a temperature of 1250°C, so that the mixture was initially reacted to synthesize 40gMg 2 SiO 4 compound. Then weigh the synthesized Mg 2 SiO 4 Powder 0.1500g, Li 2 MoO 4 (purity 99%) 2.8788g is placed in the mortar, obtains 3g Li 2 MoO 4 , Mg 2 SiO 4 Mix powder. Then take 15% (ie 0.45ml) deionized water of the mass of the mixed powder and drop it into the powder and grind it evenly to form a slurry. Choose a steel mold...

example 2

[0029] Example 2: Preparation of 90wt% Li 2 MoO 4 -10wt%Mg 2 SiO 4 Composite Ceramic Microwave Materials

[0030] Take by weighing example 1 synthetic Mg successively 2 SiO 4 Powder 0.3000g, Li 2 MoO 4 (purity 99%) 2.7272g is placed in the mortar, obtains 3g Li 2 MoO 4 , Mg 2 SiO 4 Mix powder. Then take 15% (ie 0.45ml) deionized water of the mass of the mixed powder and drop it into the powder and grind it evenly to form a slurry. Choose a steel mold with a heating function with an inner hole diameter of 12 mm. Before using the mold, use degreased cotton dipped in absolute ethanol to wipe the inner wall, ejector pin, and pad of the mold. After the mold is dry, weigh an appropriate amount of Put the slurry into the mold, use a uniaxial press to apply a pressure of 500MPa, and heat the mold to 200°C at a heating rate of 6°C / min, keep it warm for 60min, cool, demould, and dry in a drying oven at 120°C 24 hours to remove residual moisture to obtain 90 wt% Li 2 MoO 4...

example 3

[0031] Example 3: Preparation of 85wt% Li 2 MoO 4 -15wt% Mg 2 SiO 4 Composite Ceramic Microwave Materials

[0032] Take by weighing example 1 synthetic Mg successively 2 SiO 4 Powder 0.4500g, Li 2 MoO 4 (purity 99%) 2.4849g is placed in the mortar, obtains 3g Li 2 MoO 4 , Mg 2 SiO 4 Mix powder. Then take 15% (ie 0.45ml) deionized water of the mass of the mixed powder and drop it into the powder and grind it evenly to form a slurry. Choose a steel mold with a heating function with an inner hole diameter of 12 mm. Before using the mold, use degreased cotton dipped in absolute ethanol to wipe the inner wall, ejector pin, and pad of the mold. After the mold is dry, weigh an appropriate amount of Put the slurry into the mold, use a uniaxial press to apply a pressure of 500MPa, and heat the mold to 200°C at a heating rate of 6°C / min, keep it warm for 60min, cool, demould, and dry in a drying oven at 120°C 24 hours to remove residual moisture to obtain 85 wt% Li 2 MoO ...

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Abstract

The invention discloses a Li2MoO4-Mg2SiO4-based composite ceramic microwave material and a preparation method thereof. A chemical general formula of the composite ceramic can be written as xLi2MoO4-(1-x)Mg2SiO4, wherein x=10 wt%, 50 wt%, 70 wt%, 80 wt%, 85 wt%, 90 wt% or 95 wt%. The method comprises the following steps: firstly weighing magnesium oxide and silicon dioxide according to a certain stoichiometric ratio, performing ball milling for uniformization, performing drying, and performing pre-sintering to obtain Mg2SiO4; and weighing the prepared Mg2SiO4 and a Li2MoO4 raw material according to a certain weight ratio, adding 15 wt% of deionized water, performing uniform mixing, performing heat pressing on the mixture at 200 DEG C and 500 MPa for 60 min, and performing drying at 120 DEGC for 24 h to remove residual water to obtain the ultra-low-temperature cold sintered xLi2MoO4-(1-x)Mg2SiO4 composite ceramic material. Compared with traditional high-temperature solid-phase sintering(often higher than 1000 DEG C or more), the method provided by the invention has a sintering temperature in the range from room temperature to 200 DEG C; and the method provided by the invention hasa simple process, saves energy and can be widely applied to production of Li2MoO4-Mg2SiO4 composite ceramic substrates.

Description

technical field [0001] The invention relates to the technical field of microwave ceramic materials and industrial energy saving and emission reduction, in particular to an ultra-low temperature and low energy consumption sintered Li 2 MoO 4 -Mg 2 SiO 4 Matrix composite ceramic microwave material and preparation method thereof. Background technique [0002] Microwave (MW) dielectric ceramics are widely used in the manufacture of antenna substrates, resonators and filters in wireless and satellite communication technologies. Various microwave dielectric ceramics have different dielectric properties, providing a variety of material options for components. However, they are usually fabricated at high temperatures of 1000°C-1500°C, which consumes a lot of energy and hampers the possibility of integration. To overcome the above problems, cold sintering process (CSP) is used to prepare low-temperature composite ceramic materials for creating new antenna substrates and device s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3203C04B2235/3445C04B2235/786
Inventor 季玉平宋开新张欣杨刘兵徐军明高惠芳武军
Owner HANGZHOU DIANZI UNIV
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