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Neodymium niobic acid microwave dielectric ceramic with high quality factor and method for preparing neodymium niobic acid microwave dielectric ceramic

A microwave dielectric ceramic, high quality factor technology, applied in the field of ceramic compositions to achieve the effect of increasing bulk density

Inactive Publication Date: 2012-07-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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However, there is no special report on its preparation method and modification.

Method used

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  • Neodymium niobic acid microwave dielectric ceramic with high quality factor and method for preparing neodymium niobic acid microwave dielectric ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0025] According to microwave dielectric ceramic composition NdNbO 4 , weigh Nd 2 o 3 11.17g, Nb 2 o 5 8.83g of ingredients, mixed powder into polyester tank, add 150ml of deionized water and 150g of zirconium balls, ball mill on planetary ball mill for 6 hours at 1000rpm, and place in a drying oven at 120°C after discharging Dry and pass through a 40-mesh sieve, calcinate the powder at 1100 ° C for 4 hours, then weigh 0.4 g of CaF2 with a weight percentage of 2% and mix it with the powder, and then ball mill it for 24 hours. Adding the paraffin wax of 8% by weight in the mixture is carried out granulation as a binding agent, and crosses 80 mesh sieves, is pressed into the green body that diameter is 10mm with the pressure of 4MPa again with powder tablet machine, and thickness is 5mm, and green body is in Sintered at 1200°C and held for 4 hours to prepare microwave dielectric ceramics, and the microwave dielectric properties of the samples were measured.

Embodiment 2

[0027] According to microwave dielectric ceramic composition NdNbO 4 , weigh Nd 2 o 3 11.17g, Nb 2 o 5 8.83g of ingredients, mixed powder into polyester tank, add 150ml of deionized water and 150g of zirconium balls, ball mill on planetary ball mill for 6 hours at 1000rpm, and place in a drying oven at 120°C after discharging Dry and pass through a 40-mesh sieve, calcinate the powder at 1000°C for 4 hours, then weigh 0.5g of CaF2 with a weight percentage of 2.5% and mix it with the powder, then ball mill it for 24 hours, dry it after discharging and put it in the powder Adding the paraffin wax of 8% by weight in the mixture is carried out granulation as a binding agent, and crosses 80 mesh sieves, is pressed into the green body that diameter is 10mm with the pressure of 4MPa again with powder tablet machine, and thickness is 5mm, and green body is in Sintered at 1300°C and held for 4 hours to prepare microwave dielectric ceramics, and the microwave dielectric properties of...

Embodiment 3

[0029] According to microwave dielectric ceramic composition NdNbO 4 , weigh Nd 2 o 3 11.17g, Nb 2 o 5 8.83g of ingredients, mixed powder into polyester tank, add 150ml of deionized water and 150g of zirconium balls, ball mill on planetary ball mill for 6 hours at 1000rpm, and place in a drying oven at 120°C after discharging Dry and pass through a 40-mesh sieve, calcinate the powder at 900°C for 4 hours, and then weigh 2% CaF 2 0.4g is mixed with the powder and then ball milled for 24 hours for 24 hours. After the material is discharged, it is dried and 8% by weight of paraffin is added to the powder as a binder for granulation. After passing through an 80-mesh sieve, the powder is pressed into tablets Press the machine into a green body with a diameter of 10mm and a thickness of 5mm at a pressure of 4MPa. The green body was sintered at 1200°C and kept for 4 hours to obtain a microwave dielectric ceramic. The microwave dielectric properties of the sample were measured. ...

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Abstract

The invention discloses a neodymium niobic acid microwave dielectric ceramic with a high quality factor. The neodymium niobic acid microwave dielectric ceramic comprises raw material components including, by molar, 50% of Nd2O3, 50% of Nb2O5 and from 1 to 7% of CaF2. The Nd2O3 raw material and the Nb2O5 raw material are prepared according to a molar ratio of 1:1 and then are ball-milled, dried and calcined, then the CaF2 is added into the Nd2O3 and the Nd2O5 to realize granulation, and sintering is carried out at the temperature ranging from 1200 DEG C to 1325 DEG C. When the sintering temperature is 1225 DEG C, heat is retained for 4 hours, the dielectric constant of ceramic is 20.1 when the doping quantity of the CaF2 is 2wt.%, the resonance frequency temperature coefficient is -19.6ppm / DEG C, and the quality factor reaches 75000 GHz. The neodymium niobic acid microwave dielectric ceramic is widely used for manufacturing electric containers and photoelectronic devices.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a high quality factor (Q value) neodymium niobate series microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are key materials for microwave components such as resonators, filters, and dielectric substrates used in modern mobile communications, satellite communications, and military radars. With the continuous development of electronic information technology in the direction of high frequency and digitalization, the requirements for miniaturization, integration and modularization of components are becoming more and more urgent. Therefore, the pursuit of high quality factor, high dielectric constant, near-zero or adjustable temperature coefficient and low sintering temperature is the current research focus of microwave dielectric ceramic materials. [0003] Niobate materials are important el...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/50C04B35/622C04B35/63
Inventor 张平王涛李玲霞夏往所
Owner TIANJIN UNIV
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