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Beryllium oxide ceramic injection molding method

A beryllium oxide ceramic and injection molding technology, which is applied in the field of electronic functional ceramic materials, can solve problems such as difficult strength, difficult sintering, and difficult mixing uniformly, and achieve the effects of high precision of molded products, high degree of automation, and reduced production costs

Active Publication Date: 2019-08-06
宜宾红星电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, beryllium oxide ceramic materials are quite different from alumina and zirconia, and the specific surface area of ​​special beryllium oxide powder is relatively large, generally 8-14m 2 / g, which is much larger than alumina and zirconia powder, it is difficult to mix evenly with thermoplastic binder in the banburying process, and the feeding viscosity after hot melting is difficult to control; the sintering temperature of ceramics is as high as 1680 ° C, which is difficult to sinter and easy to deform. ; Low green body density, difficulty in degreasing agent and poor strength after degreasing, etc.
Therefore, there are few domestic public reports on the relevant literature and patents of beryllium oxide ceramic injection molding

Method used

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  • Beryllium oxide ceramic injection molding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Weigh 9950g of 99% high-purity beryllium oxide powder, 35g of nano-silicon dioxide, and 15g of nano-magnesia. Weigh the above materials, first weigh 9950g of deionized water, 50kg of φ4mm~6mm zirconia balls, put them into the mixing bucket, and start stirring Ball mill, set the speed to 40r / min, add nano-silica and nano-magnesia after opening, and mix evenly after ball milling for 15 minutes, set the speed of the stirring ball mill to 130r / min, add beryllium oxide powder; adjust the speed after adding beryllium oxide powder 140r / min, ball milled for 45min, finally measured the particle size of the slurry after ball milling D50 = 0.85μm.

[0062] After ball milling, the ceramic slurry is sieved through a 200-mesh nylon sieve, poured into another mixing tank, and simultaneously weighs 50 g of dispersant and 25 g of defoaming agent, pours them into the mixing tank, and stirs at the speed of the mixer at 20 r / min. Weigh 1800g of deionized water, adjust the viscosity to 35mP...

Embodiment 2

[0069] Weigh 9950g of 99% high-purity beryllium oxide powder, 25g of nano-silica, and 25g of nano-magnesia. Weigh the above materials, first weigh 9950g of deionized water, 60kg of φ4mm~6mm zirconia balls, put them into the mixing bucket, and start stirring For the ball mill, the speed is set to 80r / min. After opening, add nano-silica and nano-magnesia. After ball milling for 15 minutes and mix evenly, set the speed of the ball mill to 140r / min, and add beryllium oxide powder; after adding the beryllium oxide powder, adjust the speed 180r / min, ball milled for 30min, finally measured the particle size of the slurry after ball milling D50 = 0.90μm.

[0070]The ball-milled ceramic slurry is sieved through a 200-mesh nylon screen, poured into another mixing bucket, and simultaneously weighs 140g of dispersant and 30g of defoaming agent, pours them into the mixing bucket, and stirs at the speed of the mixer at 30r / min. At the same time, weigh 1000g of deionized water, adjust the vi...

Embodiment 3

[0077] Weigh 9950g of 99% high-purity beryllium oxide powder, 25g of nano-silicon dioxide, and 25g of nano-magnesia. Weigh the above materials. For the ball mill, the speed is set to 80r / min. After opening, add nano-silica and nano-magnesia. After the ball mill is mixed for 15 minutes, the speed of the ball mill is set to 140r / min, and beryllium oxide powder is added; after the beryllium oxide powder is added, the speed is adjusted. 180r / min, ball milled for 30min, finally measured the particle size of the slurry after ball milling D50 = 0.90μm.

[0078] After ball milling, the ceramic slurry is sieved through a 200-mesh nylon sieve, poured into another mixing bucket, and simultaneously weighs 140g of dispersant and 30g of defoaming agent, pours them into the mixing bucket, and stirs at the speed of the mixer at 30r / min. Weigh 1000g of deionized water, adjust the viscosity to 21mPa s, and spray dry in a centrifugal spray dryer. The centrifugal spray dryer is controlled accordi...

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Abstract

The invention belongs to the technical field of electronic functional ceramic materials, and particularly relates to a beryllium oxide ceramic injection molding method, which comprises: A, adding SiO2and MgO to beryllium oxide raw powder, carrying out mixing ball milling, and carrying out spray drying to prepare a beryllium oxide drying material; B, mixing an organic binder and the beryllium oxide drying material in a mixer, mixing to form a material pellet, cooling the mud pellet, breaking, and carrying out extruding granulating to prepare a feed for injection molding; C, molding a raw billet by using an injection molding machine; D, degreasing; and E, sintering to obtain a beryllium oxide injection molding product. According to the present invention, the beryllium oxide ceramic injection molding process is successfully achieved through the beryllium oxide ceramic formula adjusting, the powder surface modification treatment, the thermoplastic binder formula adjusting and the degreasing curve adjusting; and the prepared beryllium oxide injection molding product has characteristics of good compactness, high mechanical strength and good thermal conductivity, and can meet the development needs on high-heat-conducting special-shaped ceramic structure members in various fields.

Description

technical field [0001] The invention belongs to the technical field of electronic functional ceramic materials, and in particular relates to an injection molding method of beryllium oxide ceramics. Background technique [0002] Beryllium oxide ceramics have always been an important part of electronic devices in national defense equipment. In the selection of structural materials for the production of electronic components in my country, with the development of high-power and miniaturized electronic components, beryllium oxide ceramics have good thermal conductivity, high flexural strength, low dielectric constant, low dielectric loss, and high insulation. It is widely used in military communication, remote sensing and electronic countermeasures, optoelectronic technology and other fields, and has become an indispensable and important raw material for the production of microelectronic devices and optoelectronic devices. [0003] At present, domestic beryllium oxide ceramics a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/08C04B35/622
CPCC04B35/08C04B35/622C04B2235/3206C04B2235/3418C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/6022C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/9607
Inventor 王刚尚华林贵洪
Owner 宜宾红星电子有限公司