Ultralow loss limit type Mgn+1TinO3n+1 microwave ceramic and making method thereof
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A microwave ceramic, extreme technology, applied in the field of information functional materials
Inactive Publication Date: 2016-05-25
GUILIN UNIV OF ELECTRONIC TECH
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It is difficult to obtain microwave dielectric ceramics with
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Embodiment 1
[0018] Preparation of Mg 3 Ti 2 o 7 ceramic samples;
[0019] Its preparation method comprises the following steps:
[0020] (1) Synthesis of Mg 3 Ti 2 o 7 Powder: MgO:TiO according to the raw material 2 =3:2 molar ratio mixing, ball milling the resulting mixed powder for 24 hours, drying through a 100-mesh sieve, pre-calcining at 1100°C for 2 hours, and ball-milling the pre-calcined powder for 12 hours Pass through 200 sieves to obtain Mg 3 Ti 2 o 7 Synthetic powder.
[0021] (2) Compression molding: the Mg obtained in step (1) 3 Ti 2 o 7 Add 5wt% polyvinyl alcohol to the ceramic material, mix evenly, grind it finely after drying, and press it into a cylindrical green body on a molding machine;
[0022] (3) Sintering: Sinter the cylindrical green body obtained in step (2) at 1360°C for 4 hours to form porcelain, and obtain ultra-low loss limit-like Mg3 Ti 2 o 7 microwave ceramics.
[0023] Analysis of Mg by XRD diffraction pattern 3 Ti 2 o 7 Phase, determi...
Embodiment 2
[0025] Preparation of Mg 4 Ti 3 o 10 ceramic samples;
[0026] Its preparation method, except according to the raw material with MgO:TiO 2 =4:3 molar ratio mixing and sintering temperature is 1340 ℃, other steps are the same as embodiment 1.
[0027] Performance tests show that: sintered at 1340°C for 4 hours, its dielectric constant ε r is 15.4, the resonant frequency temperature coefficient τ f -56.2ppm / ℃, Q×f value is 270,400GHz(f 0 =7.677GHz).
Embodiment 3
[0029] Preparation of Mg 5 Ti 4 o 13 ceramic samples;
[0030] Its preparation method, except according to the raw material with MgO:TiO 2 =5:4 molar ratio mixing, all the other steps are with embodiment 1.
[0031] The performance test shows that when sintered at 1360°C for 4 hours, its dielectric constant ε r is 16.4, the resonant frequency temperature coefficient τ f -60.3ppm / ℃, Q×f value is 323,200GHz(f 0 =7.535GHz).
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Resonant frequency temperature coefficient
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Abstract
The invention discloses ultralow loss limit type Mgn+1TinO3n+1 microwave ceramic and a making method thereof. The chemical formula of the ceramic is: Mgn+1TinO3n+1, wherein n is equal to 2, 3, 4, 5, 6, 7, ... 50. According to the making method, Mgn+1TinO3n+1 powder is synthesized first, polyvinyl alcohol is added into the obtained powder, the mixture is mixed to be uniform and pressed into a cylindrical green body, the green body is sintered for 4 hours at the temperature of 1,340-1,380 DEG C to become ceramic, and then the ultralow loss limit type Mgn+1TinO3n+1 microwave ceramic can be obtained. Compared with MgTiO3 and Mg2TiO4 ceramic materials, the dielectric constant and temperature coefficient of resonance frequency of the Mgn+1TinO3n+1 series microwave ceramic do not change a lot, but the Q*f value is remarkably increased. The Mgn+1TinO3n+1 microwave ceramic (n=5) sintered for 4 hours at the temperature of 1,360 DEG C can obtain optimal microwave dielectric performance: Q*f is up to 382, 500 GHz (f0=7.534 GHz), epsilon r is up to 16.4, and tau f is up to -55.3 ppm/DEG C. It is predicated that the Mg6Ti5O16 ceramic material can be applied to a microwave circuit of large communication equipment in the high frequency field to serve as a main material of a dielectric substrate.
Description
technical field [0001] The invention relates to information functional materials, in particular to an ultra-low loss limit class Mg n+1 Ti n o 3n+1 Microwave ceramic materials. Background technique [0002] Due to the characteristics of high frequency, short wavelength, large information capacity and strong penetrability of microwave signals, microwave dielectric materials, as an indispensable new material in the rapidly developing communication technology, have become a worldwide trend. One of the research hotspots. Usually, the evaluation of the performance of microwave dielectric ceramics is mainly based on the relative permittivity (ε r ), the product of quality factor (Q) and resonance frequency (Q×f: Q=1 / tan, tan is the dielectric loss) and the temperature coefficient of resonance frequency (τ f ), the three parameters complement each other and restrict each other. At present, with the continuous expansion of the fields involved in communication equipment, in dif...
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