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Magnesium columbate microweve medium ceramic and its preparation process

A technology of microwave dielectric ceramics and magnesium niobate, which is applied in the direction of ceramics and inorganic insulators, can solve the problems of impossible preparation of multilayer devices, high cost of microwave ceramic devices, and inability to co-fire, etc., to achieve excellent microwave dielectric properties, easy to The effect of industrial promotion and low sintering temperature

Inactive Publication Date: 2006-01-25
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although magnesium niobate ceramics have the same properties as α-Al 2 o 3 Ceramics have comparable microwave dielectric properties, and the sintering temperature is nearly 200°C lower than that of alumina ceramics, but this type of ceramics still cannot be co-fired with cheap metal inner electrodes such as gold, silver, copper, nickel, etc., making the prepared microwave ceramics The cost of the device is still very high, and it is even less likely to be used to prepare multilayer devices

Method used

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  • Magnesium columbate microweve medium ceramic and its preparation process

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Effect test

Embodiment 1

[0035] Taking the preparation of product 100kg of the present invention as an example, the raw materials used and their weight proportions are:

[0036] Magnesium Niobate 95kg

[0037] Vanadium pentoxide 2kg

[0038] Lithium carbonate 3kg

[0039] Its preparation method is as follows:

[0040] 1. Grinding

[0041] Mix the magnesium niobate material powder with vanadium pentoxide and lithium carbonate evenly, grind into fine powder, and pass through a 150-mesh sieve to make a mixture.

[0042] 2. Granulation

[0043] Add polyvinyl alcohol with a concentration of 5% in the mixture, the addition amount is 2% of the weight of the mixture, fully stir, dry naturally, granulate, and pass through a 60-mesh sieve to make spherical powder.

[0044] 3. Making blanks

[0045] Put the granulated powder into a φ15mm stainless steel mold, and press it into a cylindrical blank with a height of 7.5mm under a pressure of 5,000.

[0046] 4. Sintering

[0047] Put the produced blank into an...

Embodiment 2

[0051] Taking the preparation of product 100kg of the present invention as an example, the raw materials used and their weight proportions are:

[0052] Magnesium Niobate 93.6kg

[0053] Vanadium pentoxide 6.4kg

[0054] The preparation method is as follows: mix magnesium niobate powder with vanadium pentoxide, grind it into fine powder, and pass through a 150-mesh sieve. Put the aluminum crucible into the muffler furnace, heat up continuously, keep warm at 500°C for 1 hour for plastic discharge, continue to heat up, sinter at 1000°C for 3 hours, cool down to 900°C, turn off the power, cool naturally, and come out of the furnace. Other processing steps are identical with embodiment 1.

Embodiment 3

[0056] Taking the preparation of product 100kg of the present invention as an example, the raw materials used and their weight proportions are:

[0057] Magnesium Niobate 99.57kg

[0058] Vanadium pentoxide 0.43kg

[0059] The preparation method is as follows: mix magnesium niobate powder with vanadium pentoxide, grind it into fine powder, and pass through a 150-mesh sieve. Put the aluminum crucible in the muffler furnace, heat up continuously, keep warm at 500°C for 1 hour to discharge the plastic, continue to heat up, sinter at 1050°C for 2 hours, cool down to 900°C, turn off the power, cool naturally, and come out of the furnace. Other processing steps are identical with embodiment 1.

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Abstract

A magnesium niobate ceramic as microwave medium is proportionally from magnesium niobate, V2O5 or VO2 and lithium carbonate (or fluoride or oxide) through proportional mixing, grinding, granulating, shaping and sintering at 900-1050 deg. C. Its advantages are high quality factor and dielectric performance and low sintering temp.

Description

technical field [0001] The invention belongs to the technical field of niobium compounds, and in particular relates to magnesium niobate microwave dielectric ceramics and a preparation method thereof. Background technique [0002] Microwave (300MHz~300GHz) dielectric ceramics are the most dynamic and promising components in the field of advanced ceramic materials, and one of the key materials in the fields of electronics, information, computers, communications, automation, aerospace and other fields. The performance of microwave dielectric ceramics mainly refers to its microwave dielectric properties, commonly used dielectric constant ε, loss tangent tanδ (or Q f value, Q is 1 / tanδ, f is resonant frequency) and resonant frequency temperature coefficient τ f represented by three parameters. According to the performance of microwave materials, microwave dielectric ceramics can be divided into three categories: (1) high ε r , Low-Q microwave dielectric ceramics, mainly used i...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01B3/12
Inventor 刘鹏张怀武边小兵杨万民姚国光苏未安
Owner SHAANXI NORMAL UNIV
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