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Copper ion doped calcium silicate microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and calcium silicate, which is applied in the field of electronic ceramic materials, can solve the problems of unsatisfactory quality factor of CaSiO ceramics, difficulty in achieving low-temperature co-firing, high sintering temperature, etc., and achieve excellent microwave dielectric properties, high density, Effect of Improving Dielectric Properties

Active Publication Date: 2022-04-15
昆明贵研新材料科技有限公司
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Problems solved by technology

[0004] Although CaSiO is made by doping or adding a sintering aid 3 The dielectric properties of ceramics have been improved, but the sintering temperature of the current solid-phase synthesis method is still high, it is difficult to achieve low-temperature co-firing, and the resulting CaSiO 3 The quality factor of ceramics is not ideal enough, and there is still a big gap in meeting practical applications

Method used

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  • Copper ion doped calcium silicate microwave dielectric ceramic and preparation method thereof
  • Copper ion doped calcium silicate microwave dielectric ceramic and preparation method thereof
  • Copper ion doped calcium silicate microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0035] The invention provides a preparation method of copper ion-doped calcium silicate microwave dielectric ceramics, comprising the following steps:

[0036] According to the stoichiometric ratio of calcium, copper and silicon in formula I, CaCO 3 , SiO 2 and CuO are mixed, and the resulting mixture is first ball milled to obtain the first ball mill;

[0037] Ca 1-x Cu x SiO 3 Formula I; In formula I: 0

[0038] Grinding and calcining the first ball mill material in sequence, and subjecting the obtained calcined powder to second ball milling to obtain Ca 1- x Cu x SiO 3 Powder;

[0039] the Ca 1-x Cu x SiO 3 After the powder and the binder are mixed, they are successively granulated, sieved and pressed to obtain a ceramic green body;

[0040] The ceramic green body is sintered to obtain copper ion-doped calcium silicate microwave dielectric ceramics; the sintering temperature is above 1050°C.

[0041] The present invention according to the stoichiomet...

Embodiment 1

[0056] Calcined at 1250 °C, 1275 °C, 1300 °C and 1325 °C for 2 h to synthesize CaSiO 3 Powder.

[0057] By compound CaSiO 3 The stoichiometric ratio of each element, weigh the raw material CaCO 3 50g, SiO 2 30g, put the weighed raw materials into the ball mill jar after mixing for 40min with a three-dimensional mixer, and carry out the first ball milling, with deionized water as the dispersant, and the ball milling medium as zirconia balls, zirconia balls and powder, The mass ratio of deionized water is 3:1:1, the ball milling speed is 300r / min, and the ball milling time is 4h. After the ball milling, the obtained mixed powder was dried in an oven at 80° C. for 15 hours to remove moisture, and after drying, the mixed powder was ground in an agate mortar and evenly ground. The uniformly ground powder was calcined in a box furnace for 2 hours (calcination temperatures were 1250°C, 1275°C, 1300°C and 1325°C, respectively), and the heating rate was 5°C / min. The obtained cal...

Embodiment 2

[0059] Calcined at 1300°C for 2h to synthesize Ca 1-x Cu x SiO 3 Powder (x=0.005, 0.01, 0.015, 0.020 or 0.025):

[0060] by compound Ca 1-x Cu x SiO 3 The stoichiometric ratio of each element weighs the raw material CaCO 3 , SiO 2 and CuO, mix the weighed raw materials with a three-dimensional mixer for 40 minutes, then put them into a ball mill tank for the first ball mill, use deionized water as the dispersant, and the ball mill medium is zirconia balls, zirconia balls and powder 1. The mass ratio of deionized water is 3:1:1, the ball milling speed is 300r / min, and the ball milling time is 4h. After the ball milling, the obtained mixed powder was dried in an oven at 80° C. for 15 hours to remove moisture, and after drying, the mixed powder was ground in an agate mortar and evenly ground. The uniformly ground powder was calcined in a box furnace at 1300 °C for 2 h with a heating rate of 5 °C / min. The obtained calcined powder is subjected to the second ball milling, t...

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Abstract

The invention relates to the technical field of electronic ceramic materials, and provides a copper ion doped calcium silicate microwave dielectric ceramic and a preparation method thereof. Copper ions are doped in calcium silicate microwave dielectric ceramic, generation of impure phases in calcined powder can be inhibited by controlling the proper doping amount of the copper ions, pure-phase alpha-CaSiO3 powder (a triclinic system, and a space group is C1) is obtained, and then single-phase beta-CaSiO3 ceramic (a monoclinic system, and a space group is P21 / a) is obtained through sintering. The obtained copper ion doped calcium silicate microwave dielectric ceramic is high in density and excellent in microwave dielectric property, and has a relatively high quality constant and a relatively low dielectric constant. Besides, by doping copper ions, the sintering temperature range of the ceramic is widened, the sintering temperature of a traditional solid-phase synthesis method is 1300 DEG C or above, while the sintering temperature of the preparation method provided by the invention is only 1050 DEG C or above, low-temperature co-firing can be realized, and actual production is facilitated.

Description

technical field [0001] The invention relates to the technical field of electronic ceramic materials, in particular to a copper ion-doped calcium silicate microwave dielectric ceramic and a preparation method thereof. Background technique [0002] The rapid development of 5G technology and mobile communication has created a huge demand for microwave ceramic components such as resonators, filters, and dielectric antennas. At present, the available frequency of mobile communication has been extended from the low frequency range (<300KHz) to the extremely high frequency range (>30GHz), and a large amount of information must be transmitted at high speed in the extremely high frequency range. Generally, microwave communication dielectric materials need to meet the following requirements: low dielectric constant (ε r <10) to reduce the interaction coupling loss between the material and the electrode and increase the propagation rate of the signal; a higher quality factor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/22C04B35/622
Inventor 曾一明王刚李明伟韩娇林泽辉何佳麒李梦虹
Owner 昆明贵研新材料科技有限公司
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