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Low temperature co-fired ceramic material and preparation method thereof

A technology of low temperature co-fired ceramics and tetragonal crystal system, applied in the field of microwave dielectric ceramics, can solve the problems of application limitations of microwave dielectric ceramic materials, difficult low temperature co-fired ceramic technology, inability to co-fire with metals, etc., and achieves low sintering temperature, small Effects of dielectric loss, mild reaction temperature

Active Publication Date: 2017-09-29
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The low temperature co-fired ceramic technology (Low Temperature Co-fired Ceramic, LTCC) is to make low temperature sintered ceramic powder into a green ceramic belt with precise thickness and density, and use laser drilling, microporous grouting, and precision conductors on the green ceramic belt. Paste printing and other processes produce the required circuit patterns, embed multiple passive components in it, and then stack them together and sinter them below 900°C to achieve high-integration packaging of electronic components, but ordinary microwave media The sintering temperature of ceramics is too high (higher than the melting point of common metals), and it cannot be co-fired with metals, so it is difficult to apply to low-temperature co-fired ceramic technology, which greatly limits the application of microwave dielectric ceramic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of nanometer lanthanum bismuth molybdate sodium powder, comprising the following steps:

[0023] 1) 48.5g (0.1mol) Bi(NO 3 ) 3 ·5H 2 O, 234g (0.4mol) La(NO 3 ) 3 ·6H 2 O was dissolved in 2L of 95% ethanol solution under stirring to obtain solution I;

[0024] 2) 242g (1mol) Na 2 MoO 4 2H 2 O is dissolved in 2L ethanol / water (volume ratio 1:1) mixed solvent under stirring, after dissolving, add 242g polyethylene glycol (PEG molecular weight 2000), stir evenly, obtain solution II;

[0025] 3) Mix the solution I obtained in step 1) and the solution II obtained in step 2) under strong stirring. After the obtained precursor is stirred evenly, transfer it to a sealed 5L high-pressure reactor, heat up to 180°C for 12 hours, and let the reactor naturally After cooling to room temperature, the resulting product was centrifugally filtered, washed with deionized water, and the resulting powder was dried at 150°C for 2 hours to obtain NaBi 0.2 La 0.8...

Embodiment 2

[0028] A preparation method of nanometer lanthanum bismuth molybdate sodium powder, comprising the following steps:

[0029] 1) 194g (0.4mol) Bi(NO 3 ) 3 ·5H 2 O and 58.5g (0.1mol) La(NO 3 ) 3 ·6H 2 O was dissolved in 2L ethanol solution under stirring to obtain solution I;

[0030] 2) 242g (1mol) Na 2 MoO 4 2H 2 O is dissolved in 2L ethanol / water (volume ratio 1:1) mixed solvent under stirring, after dissolving, add 48.4g polyethylene glycol (PEG molecular weight 600), stir evenly, obtain solution II;

[0031] 3) Mix the solution I obtained in step 1) and the solution II obtained in step 2) under strong stirring. After the precursor is stirred evenly, transfer it to a sealed 5L high-pressure reactor, raise the temperature to 130°C for 6 hours, and let the reactor naturally After cooling to room temperature, the resulting product was centrifugally filtered, washed with deionized water, and the resulting powder was dried at 800°C for 12 hours to obtain NaBi 0.8 La 0....

Embodiment 3

[0034] A preparation method of nanometer lanthanum bismuth molybdate sodium powder, comprising the following steps:

[0035] 1) 48.5g (0.1mol) Bi(NO 3 ) 3 ·5H 2 O, 58.5g (0.1mol) La(NO 3 ) 3 ·6H 2 O was dissolved in 500 mL of 95% ethanol solution under stirring to obtain solution I;

[0036] 2) 96.8g (0.4mol) Na 2 MoO 4 2H 2 O is dissolved in 500mL ethanol / water mixed solvent under stirring, after dissolving, add 50g polyethylene glycol (PEG molecular weight 2000), stir evenly, obtain solution II;

[0037] 3) Mix the solution I obtained in step 1) and the solution II obtained in step 2) under strong stirring. After the precursor is stirred evenly, transfer it to a sealed 5L high-pressure reactor, raise the temperature to 150°C for 6 hours, and let the reactor naturally After cooling to room temperature, the resulting product was centrifugally filtered, washed with deionized water, and the resulting powder was dried at 100°C for 6 hours to obtain NaBi 0.5 La 0.5 (MoO...

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Abstract

The invention relates to a low temperature co-fired ceramic material and a preparation method thereof. The low temperature co-fired ceramic material is NaBixLa(1-x)(MoO4)2 having a tetragonal crystal system structure, wherein 0x is not less than 0.2 and not more than 0.8, and the average particle size is 30-60 nm. The low temperature co-fired molybdate composite ceramic material prepared in the invention has a high dielectric constant (epsilon r is more than 10), a very small dielectric loss (Qf is more than 5000 GHz), a very low resonant frequency temperature coefficient (TCF is about 0 ppm / DEG C) and a low firing temperature (lower than the melting points of common metals Ag, Cu and Al), does not react with Ag and the like, can be used as a base material for LTCC substrates and packaging materials, and also can be used in electronic components, such as resonators and filters, as a microwave dielectric ceramic.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and relates to a low-temperature co-fired ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are dielectric ceramic materials that are mainly used in circuits in the microwave frequency band (mainly 300MHz to 300GHz, corresponding to electromagnetic wavelengths of 1m to 1mm), and play one or more functions in the circuit. They are modern communication electronic components. (resonators, oscillators, filters, dielectric waveguide circuits, dielectric antennas, etc.) are widely used key materials. With the development of electronic circuits in the direction of miniaturization, integration and high frequency, the field of information technology has put forward requirements for electronic components with small size, high integration and low cost. [0003] The low temperature co-fired ceramic technology (Low Temperature...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626
CPCC04B35/495C04B35/62605C04B2235/3201C04B2235/3227C04B2235/3256C04B2235/3298C04B2235/5454
Inventor 林志东杨静付萍陈喆邓泉荣
Owner WUHAN INSTITUTE OF TECHNOLOGY
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