A kind of garnet structure aluminate microwave dielectric ceramic and preparation method thereof
A technology of microwave dielectric ceramics and garnets, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of poor temperature stability of devices, no research reports, etc., and achieve a variety of effects
Active Publication Date: 2020-04-28
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology
[0002] Al 2 o 3 MAl with ceramic and spinel structure 2 o 4 Modified NdAlO with (M=Zn, Mg) Ceramic and Perovskite Structure 3 and LaAlO 3 Ceramic materials have been important aluminum-based microwave dielectric ceramic materials, and for aluminate ceramic materials with garnet structure such as Y 3 Al 5 o 12 Whether (YAG) ceramics can also be used as microwave dielectric materials has not yet been definite research reports
In 2009, Kagomiya prepared YAG ceramics by solid-state reaction method. The relative density of the sample obtained by sintering at 1650°C for 24 hours reached 99.6%, and it had excellent microwave dielectric properties: ε r =10.5, Q×f=440000GHz, τ f =-50ppm / ℃, Q×f value is very high, but τ f If the value is large, the temperature stability of the device will be poor after being made into a microwave device
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[0017] To make these examples Ca x Y 3-x Al 5-x Ti x o 12 The specific implementation steps of the solid solution aluminate microwave dielectric ceramic material are as follows:
[0018] Step 1: Ingredients. choose Y 2 o 3 、Al 2 o 3 , CaCO 3 、TiO 2 As raw material, its purity is 99.9%, according to the design formula Ca x Y 3-x Al 5-x Ti x o 12 (x=1.0-2.0) Weigh the raw materials.
[0019] Step 2: Ball milling. Put the raw materials prepared in step 1 into a ball mill jar to prepare for ball milling, wherein the mass ratio of raw material powder, alumina balls and absolute ethanol is: 1:5.7:1.6. Ball mill at 200r / min for 24 hours on a planetary ball mill.
[0020] Step 3: Pre-fire. Dry the ball-milled slurry in step 2 at 80°C, pass through a 100-mesh nylon sieve, and pre-calcine at 900°C for 4 hours.
[0021]Step 4: Shaping. The calcined powder obtained in step 3 was dry-pressed under a pressure of 20 MPa to obtain a ceramic green body Φ20mm*8mm.
[0022]...
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Abstract
The invention discloses aluminate microwave dielectric ceramic with a garnet structure. A chemical formula of the material is CaxY3-xAl5-xTixO12, wherein x is equal to 1.0 to 2.0. The invention further provides a preparation method of the aluminate microwave dielectric ceramic with the garnet structure. The aluminate microwave dielectric ceramic with the garnet structure, provided by the invention, is a novel microwave dielectric ceramic material; furthermore, the variety of the high-performance aluminate microwave dielectric ceramic material is enriched.
Description
technical field [0001] The invention relates to a dielectric ceramic and a preparation method thereof, in particular to a garnet structure aluminate microwave dielectric ceramic and a preparation method thereof, belonging to the technical field of electronic information functional materials and devices. Background technique [0002] Al 2 o 3 MAl with ceramic and spinel structure 2 o 4 Modified NdAlO with (M=Zn, Mg) Ceramic and Perovskite Structure 3 and LaAlO 3 Ceramic materials have been important aluminum-based microwave dielectric ceramic materials, and for aluminate ceramic materials with garnet structure such as Y 3 Al 5 o 12 Whether (YAG) ceramics can also be used as microwave dielectric materials has not yet been definite research reports. In 2009, Kagomiya prepared YAG ceramics by solid-state reaction method. The relative density of the sample obtained by sintering at 1650°C for 24 hours reached 99.6%, and it had excellent microwave dielectric properties: ε ...
Claims
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IPC IPC(8): H01B3/12C04B35/465C04B35/626
CPCC04B35/465C04B35/62605C04B35/62645C04B2235/3217C04B2235/3225C04B2235/6567C04B2235/658
Inventor 余盛全敬畏尹文龙胥涛方攀窦云巍袁泽锐陈莹唐明静康彬张羽谢靖
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS