Beryllium oxide/silicon carbide composite microwave attenuating ceramic and preparation method thereof

A technology of microwave attenuation and composite ceramics, which is applied in the field of electronic functional ceramic materials, can solve the problems of sudden change in performance of metallized attenuation ceramics, low mechanical strength of materials, and decline in dielectric properties, so as to reduce energy consumption, adjust electromagnetic parameters, absorb The effect of bandwidth

Active Publication Date: 2018-09-18
宜宾红星电子有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, the loading material of the klystron (power amplifier tube) is metal attenuating porcelain, but with the increase of power and the widening of the frequency band and other high technical indicators, the dielectric performance of metal attenuation porcelain decreases due to the increase of power and the increase of ambient temperature. , and the poor thermal conductivity of the material itself is likely to cause the device to be burned or even scrapped, and the performance mutation of the metallized attenuation porcelain is obvious; while the carbon-containing attenuation porcelain will be outgassed due to its poor compactness during use, and the material itself is mechanically damaged. low strength, low reliability

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  • Beryllium oxide/silicon carbide composite microwave attenuating ceramic and preparation method thereof

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preparation example Construction

[0026] The invention provides a method for preparing beryllium oxide / silicon carbide composite microwave attenuating ceramics, the method comprising the following steps:

[0027] (1) Preparation of beryllium oxide porcelain powder:

[0028] ①. Beryllium oxide powder according to the weight ratio: magnesium trisilicate = 100: 0.5 ~ 0.55 to obtain the raw material powder, and then according to the raw material powder: deionized water: φ4 ~ 6mm zirconia ball = 1: 0.3 ~ 1: 4 ~10 Mix the three to obtain slurry, and ball mill to slurry particle size D 50 Between 0.7~1.0μm;

[0029] ②. Pass the above slurry through a 180-250 mesh screen and remove iron, dry at 150-250°C, and pass through a 180-250 mesh screen to obtain beryllium oxide porcelain powder;

[0030] (2) Preparation of composite ceramic powder:

[0031] ① Beryllium oxide porcelain powder according to mass percentage: silicon carbide powder: yttrium oxide powder = 60~80%: 18~35%: 2~5%, mix the three to obtain the total powder;

[003...

Embodiment 1

[0049] Weigh 5kg of beryllium oxide powder, 0.025kg of magnesium trisilicate, 5kg of deionized water, 22kg of zirconia balls of φ4~6mm according to the ratio. Pour the deionized water into the mixing tank of the UP mixer, and then put the zirconia balls Put into the mixing tank, turn on the ball mill mixer at 50 rpm, add beryllium oxide powder and magnesium trisilicate, and adjust the mixer speed to 130 rpm. The particle size of the slurry measured by ball milling for 30 minutes was 0.89 μm. The ball-milled slurry is passed through a 200-mesh screen, and after iron is removed, it is placed in an oven at 200°C for drying, and then passed through a 200-mesh screen to form beryllium oxide porcelain powder.

[0050] Take 400g of α-silicon carbide, 40g of yttrium oxide, 1560g of the prepared beryllium oxide porcelain powder, put it into the UP stirring ball mill, put 6kg of φ4~6mm beryllium oxide porcelain ball, add 2kg of deionized water, stir for 30min, pour Put it into a container...

Embodiment 2

[0052] Take 600g of α-silicon carbide, 40g of yttrium oxide, and 1360g of the prepared beryllium oxide porcelain powder, put them in the UP stirring ball mill, put 6kg of φ4~6mm beryllium oxide porcelain balls, add 2kg of deionized water, stir for 30min, pour After being dried in a container oven at 200°C, it is passed through a 200-mesh screen to form composite ceramic powder, and then 100g of melted paraffin is added to the composite ceramic powder, and the preparation is made by manual stirring. Dry-press forming by hydraulic press, forming pressure 150MPa, holding time 3s, wrapped in plastic bag and isostatic pressing forming, forming pressure 180MPa, holding time 45s, after forming into a 65mm×65mm×7mm green block, use Anhydrous ethanol adjusts the boron nitride powder into a paste with a mass fraction of 90%, and coats it on the surface of the green block. The upper and lower surfaces add graphite paper gaskets with a thickness of 0.1mm, and then add graphite block gaskets...

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Abstract

The invention belongs to the technical field of electronic functional ceramic materials and particularly relates to a beryllium oxide / silicon carbide ceramic composite microwave attenuation ceramic and a preparation method thereof. The method includes the following steps of 1 preparation of beryllium oxide ceramic powder, 2 preparation of composite ceramic powder, 3 extrusion forming and 4 hot-pressing sintering. The preparation method is simple and easy to operate, and the beryllium oxide / silicon carbide ceramic composite microwave attenuation ceramic prepared by adopting the preparation method has the advantages of high heat stability, high heat conductivity, good microwave parameter stability and high mechanical strength and is widely applied to space traveling wave tubes, speed-regulating machine magnetrons and other microwave electronic vacuum devices.

Description

Technical field [0001] The invention belongs to the technical field of electronic functional ceramic materials, and specifically relates to a beryllium oxide / silicon carbide composite microwave attenuating ceramic and a preparation method thereof. Background technique [0002] As an attenuating ceramic, the microwave attenuation material is an important functional material in the microwave tube. Its role in the microwave tube is to fully absorb the signal, reduce reflection and selectively suppress various modes of clutter, so as to ensure the given microwave parameters , Improve the stability of the device. In many microwave vacuum electronic devices (traveling wave tubes, gyrotrons, backward wave tubes, forward wave amplifiers, coaxial magnetrons), it is often necessary to place attenuating ceramics to provide matching electromagnetic terminals to suppress band edge oscillation and high Oscillation of secondary or parasitic modes and elimination of other non-design modes. If ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/08C04B35/626C04B35/645
CPCC04B35/08C04B35/62605C04B35/6261C04B35/62625C04B35/645C04B2235/3225C04B2235/3445C04B2235/3826C04B2235/96C04B2235/9607
Inventor 王刚尚华林贵洪毛晋峰任鹏道彭世鹏张亮刘志文
Owner 宜宾红星电子有限公司
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