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Lithium magnesium titanium type microwave dielectric ceramic sintered at low temperature

A microwave dielectric ceramic and low-temperature sintering technology, which is applied in the field of electronic information materials and components, can solve the problems of high sintering temperature and cannot meet the temperature requirements, etc., and achieves the advantages of simple preparation process, improvement of resonant frequency temperature coefficient, and wide application prospects. Effect

Inactive Publication Date: 2014-11-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that the sintering temperature is higher and cannot meet the temperature requirements of the LTCC technology, and to provide a Li 2 CO 3 , MgO, TiO 2 as the main raw material, and add a small amount of MgO-B 2 o 3 -SiO 2 (MBS) glass low-melting sintering aid, which successfully reduces the sintering temperature to below 950 °C while maintaining good microwave dielectric properties Li 2 MgTi 3 o 8 microwave dielectric ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Li with a purity greater than 99.9% 2 CO 3 , MgO and TiO 2 Moore Billy 2 CO 3 :MgO:TiO 2 = 1:1:3 mixed powder configured as the main powder.

[0023] (2) Put the mixed powder into a polyester tank, add deionized water and zirconia balls, and ball mill for 6 hours on a planetary ball mill with a ball mill speed of 1000 rpm; Dry in a drying oven. After drying, pass the raw material through a 40-mesh sieve to obtain a powder with uniform particles.

[0024] (3) Pre-burn the sieved powder at 900°C for 3 hours, keep it warm for 4 hours, and synthesize the main crystal phase; then pulverize the pre-fired powder, weigh 20g, and add 0.5 wt% of the raw material MBS, secondary ingredients.

[0025] (4) Put the powder processed by the secondary ingredients into the planetary ball mill for ball milling for 6 hours, the ball mill speed is 1000 rpm, and dry in an infrared drying box; then add the raw material to the dried powder The binder paraffin wax with a content of 8...

Embodiment 2

[0029] (1) Li with a purity greater than 99.9% 2 CO 3 , MgO and TiO 2 Moore Billy 2 CO 3 :MgO:TiO 2 = 1:1:3 mixed powder configured as the main powder.

[0030] (2) Put the mixed powder into a polyester tank, add deionized water and zirconia balls, and ball mill for 6 hours on a planetary ball mill with a ball mill speed of 1000 rpm; Dry in a drying oven. After drying, pass the raw material through a 40-mesh sieve to obtain a powder with uniform particles.

[0031] (3) Pre-burn the sieved powder at 900°C for 3 hours, keep it warm for 4 hours, and synthesize the main crystal phase; then pulverize the pre-fired powder, weigh 20g, and add 2.0 wt% of the raw material MBS, secondary ingredients.

[0032] (4) Put the powder processed by the secondary ingredients into the planetary ball mill for ball milling for 6 hours, the ball mill speed is 1000 rpm, and dry in an infrared drying box; then add the raw material to the dried powder The binder paraffin wax with a content of 8...

Embodiment 3

[0036] (1) Li with a purity greater than 99.9%2 CO 3 , MgO and TiO 2 Moore Billy 2 CO 3 :MgO:TiO 2 = 1:1:3 mixed powder configured as the main powder.

[0037] (2) Put the mixed powder into a polyester tank, add deionized water and zirconia balls, and ball mill for 6 hours on a planetary ball mill with a ball mill speed of 1000 rpm; Dry in a drying oven. After drying, pass the raw material through a 40-mesh sieve to obtain a powder with uniform particles.

[0038] (3) Pre-burn the sieved powder at 900°C for 3 hours, keep it warm for 4 hours, and synthesize the main crystal phase; then pulverize the pre-fired powder, weigh 20g, and add 4.0wt% of the raw material by weight MBS, secondary ingredients.

[0039] (4) Put the powder processed by the secondary ingredients into the planetary ball mill for ball milling for 6 hours, the ball mill speed is 1000 rpm, and dry in an infrared drying box; then add the raw material to the dried powder The binder paraffin wax with a conte...

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Abstract

The invention discloses Li2MgTi3O8 type microwave dielectric ceramic sintered at low temperature. The microwave dielectric ceramic comprises Li2MgTi3O8 and m wt% of MBS, wherein the MBS is an addition agent, namely, a MgO-B2O3-SiO2 glass low-melting-point sintering aid, and comprises, by mass percent, 42% of MgO, 45% of B2O3 and 13% of SiO2, and m represents the mass percent of the addition agent accounting for raw materials, and is larger than or equal to 0.5 and smaller than or equal to 8. The microwave dielectric ceramic is sintered at the temperature of 900 DEG C in advance, heat is preserved for four hours, the ceramic is synthesized into the principal crystalline phase, the MBS is additionally added, after pelleting and compression moulding are carried out, the ceramic is sintered at the temperature of 800 DEG C to 950 DEG C, the heat is preserved for two to six hours, and the Li2MgTi3O8 type microwave dielectric ceramic is manufactured. According to the ceramic, the defects that the sintering temperature is high, and the requirement for the temperature by the LTCC technology can not be met in the prior art are overcome, and the good microwave dielectric property is kept.

Description

technical field [0001] The invention belongs to the field of electronic information materials and components, in particular to a novel low-temperature sintered microwave dielectric ceramic lithium magnesium titanium (Li magnesium titanium) 2 MgTi 3 o 8 ) system and preparation method thereof. Background technique [0002] At present, mobile communication devices are developing in the direction of small size, high integration, light weight, high reliability, and low cost. This requires microwave circuits to use ceramic materials with better performance and more advanced production and preparation processes, which also puts forward higher requirements on the dielectric properties of microwave dielectric ceramics as the basis of microwave circuits. Low temperature co-fired ceramics (Low Temperature Co-fired ceramics, LTCC) technology can carry out comprehensive design of multi-layer structure, can effectively use three-dimensional space to design circuits, and helps to reali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/622
Inventor 张平刘健
Owner TIANJIN UNIV
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