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Microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and ceramics, applied in the field of ceramic materials, can solve the problems of complex process, poor temperature stability and poor mechanical properties of microwave dielectric ceramics

Inactive Publication Date: 2021-09-07
臻金新材(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, an object of the present invention is to provide a microwave dielectric ceramic, which aims to solve the technical problems of microwave dielectric ceramics in the prior art, such as poor temperature stability and mechanical properties, and complicated processes

Method used

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  • Microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0032] The preparation method of the microwave dielectric ceramic of the present invention may comprise the following steps:

[0033] (1) MgO and TiO with a purity of more than 99% 2 , CaCO 3 As the raw material, according to the composition expression aMgTiO 3 -bCaTiO 3 According to the molar ratio of each element in the compound, it is first dissolved in deionized water, then fully mixed by ball milling, dried and pre-fired to obtain magnesium-calcium-titanium system ceramics, which are used as the main material of microwave dielectric ceramics.

[0034] Wherein, the drying temperature is 200°C. The technical parameters of pre-burning are: the pre-burning temperature is 1000°C-1200°C, and the pre-burning time is 2-6 hours.

[0035] (2) Doping with sintering aids with a purity of more than 99.9%: relative to the mass of the main material, weigh MnO according to the mass fraction 2 , Fe 2 O 3 , ZnO, SiO 2 , Nb 2 O 5 , Cr 2 O 3 , La 2 O 3 , NiO, ZrO 2 and Nd 2 O...

Embodiment 1

[0040] Microwave dielectric ceramic 0.955MgTiO 3 -0.045CaTiO 3 -MnO 2 -SiO 2 , is the sintering aid MnO 2 and SiO 2 Doped magnesium perovskite ceramics, where MnO 2 Relative to the main material 0.955MgTiO 3 -0.045CaTiO 3 The mass fraction of SiO is 0.21%; SiO 2 0.955MgTiO relative to the main material 3 -0.045CaTiO3 The mass fraction is 0.13%.

[0041] The preparation method of the above-mentioned microwave dielectric ceramics comprises the following steps:

[0042] (1) MgO and TiO with a purity of more than 99% 2 , CaCO 3 as raw material, dissolved in deionized water, and then ball milled to mix evenly, and the prepared mixed solution was dried in an oven at 200°C, crushed, and sieved; the powder obtained by sieving was pre-calcined, and the pre-calcined temperature was 1000°C, pre-fired for 2 hours to obtain the main material magnesium perovskite ceramic powder;

[0043] (2) Add sintering aid MnO to magnesium perovskite ceramic powder 2 and SiO 2 , dispersant...

Embodiment 2

[0045] Microwave dielectric ceramic 0.955MgTiO 3 -0.045CaTiO 3 -SiO 2 -ZrO 2 -Fe 2 o 3 , as the sintering aid SiO 2 , ZrO 2 and Fe 2 o 3 Doped magnesium perovskite ceramics, where SiO 2 Relative to the main material 0.955MgTiO 3 -0.045CaTiO 3 The mass fraction of ZrO is 0.15%; ZrO 2 0.955MgTiO relative to the main material 3 -0.045CaTiO 3 The mass fraction is 0.91%; Fe 2 o 3 0.955MgTiO relative to the main material 3 -0.045CaTiO 3 The mass fraction is 0.18%.

[0046] The preparation method of the above-mentioned microwave dielectric ceramics comprises the following steps:

[0047] (1) MgO and TiO with a purity of more than 99% 2 , CaCO 3 Dissolve in deionized water as raw material, and then ball mill and mix thoroughly; place the prepared mixed solution in an oven at 200°C for drying, crush, and sieve; The temperature is 1050°C, and the pre-firing time is 2 hours to obtain the main material magnesium perovskite ceramic powder;

[0048] (2) Add sintering a...

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Abstract

The invention discloses a microwave dielectric ceramic and a preparation method thereof. The microwave dielectric ceramic is RO doped magnesium-calcium-titanium system ceramic, and the chemical composition expression of the microwave dielectric ceramic is aMgTiO3-bCaTiO3-RO. The magnesium-calcium-titanium system ceramic is a main material, the chemical expression of the magnesium-calcium-titanium system ceramic is aMgTiO3-bCaTiO3, a and b respectively represent molar ratios, a is more than or equal to 0.90 and less than or equal to 0.99, b is more than or equal to 0.01 and less than or equal to 0.1, and a + b is equal to 1; the RO is a sintering aid, and comprises at least one of MnO2, Fe2O3, ZnO, SiO2, Nb2O5, Cr2O3, La2O3, NiO, ZrO2 and Nd2O3. According to the microwave dielectric ceramic, the RO doped magnesium-calcium-titanium system ceramic serving as the sintering aid is used for forming the microwave dielectric ceramic, and the microwave dielectric ceramic has the advantages of excellent microwave dielectric property, high quality factor, moderate dielectric constant, better temperature stability, excellent mechanical property, wide application prospect, simple preparation process, convenience in operation and good repeatability.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a microwave dielectric ceramic and a preparation method thereof. Background technique [0002] As a new type of functional ceramics, microwave dielectric ceramics have the characteristics of large dielectric constant, low dielectric loss, and small temperature coefficient of resonance frequency. They can be made into components such as filters, resonators, oscillators, waveguide transmission lines, and dielectric antennas. It is widely used in microwave communication fields such as mobile communication, satellite live broadcast, radio remote control, radar, GPS, etc., and is the key material of current communication technology. At present, manufacturers of microwave dielectric ceramic filters in the industry are prepared by high-temperature sintering of solid-state method. The process is complex, the mechanical properties of ceramics are poor, the temperature stability ...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622C04B35/63
CPCC04B35/465C04B35/622C04B35/6303C04B2235/3206C04B2235/3208C04B2235/3232C04B2235/3418C04B2235/3267C04B2235/602C04B2235/656C04B2235/6567C04B2235/3244C04B2235/3272C04B2235/3224C04B2235/3241C04B2235/3251C04B2235/3279C04B2235/3227
Inventor 宿金栋蒋韶华范宇余亮郭槐梁宝龙
Owner 臻金新材(深圳)有限公司
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