Forming method and device of ceramic micro-bead green body

A technology of ceramic microbeads and a molding method, applied in the field of structural ceramics, can solve problems such as being unfavorable to the physical and mental health of operators and environmental protection, reducing the qualified rate of spheres, and many liquid beads or lines, so as to protect workers' health and safety. Surrounding environment, improving bead yield and production efficiency, and the effect of continuous and efficient production

Active Publication Date: 2012-07-25
GANZHOU KOIN STRUCTURE CERAMICS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When preparing ceramic microspheres with precise size and high density, these methods have many shortcomings, such as low efficiency, insufficient roundness, complicated equipment and large personnel investment, etc.
[0003] The Chinese patent No. ZL02125221.1 "Method and device for preparing ceramic beads" provides a method and device for preparing ceramic beads. The disadvantages of this method and device are: ① the use of toxic compounds acrylamide and Its derivatives, as organic monomers, have toxic effects on the nervous system and reproductive system of operators, and are classified as secondary carcinogens, which are not conducive to the physical and mental health of operators and environmental protection
During the gelation reaction of acrylamide, the surface is easily inhibited by oxygen and peels off, which brings defects to the product
③Low efficiency, difficult to accurately control the bead size: through the low-efficiency funnel, use gravity to make the suspension drop into the heated oily medium in the form of liquid beads, so that the liquid beads form balls and solidify. The liquid level must be kept within a certain range, which makes the actual operation more complicated and difficult to control precisely. There are many drops or lines of dripping liquid, and the size fluctuation range is large.
④Difficult to collect and cannot be continuously produced: by releasing the oily medium from the collection tank to collect the green microbeads, the previous step of dripping the beads is interrupted. This method cannot be continuously produced, which affects production efficiency and is labor-intensive. , which increases production costs
⑤ The surface defects of the green body are caused during post-processing such as washing of the green body of the micro-beads, which increases the out-of-roundness of the green body of the micro-beads: an oily medium is used to promote the dripping bead-like slurry into balls, and the surface of the green body of the micro-beads Adhering to the oily substance brings inconvenience to transportation and firing. When the formed microbead green body is washed, the surface of the microbead green body is eroded, resulting in increased loss of raw material of the microbead green body and surface defects, reducing the Pass rate

Method used

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  • Forming method and device of ceramic micro-bead green body
  • Forming method and device of ceramic micro-bead green body
  • Forming method and device of ceramic micro-bead green body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Preparation of alumina beads and its green forming device

[0025] See figure 1 .

[0026] Alumina microbeads forming device: high-position storage tank 1 and titration vessel 3 are connected by a pipe, the bottom of titrator 3 is provided with a Φ0.9mm titration hole 12, and the vibrator 14 is connected to the side of the titrator 3, below the titrator 3 A collection tank 6 containing glycerin 7 is provided. The collection tank 6 is equipped with an oil bath heating device 9 outside, and the collection tank 6 is equipped with a screen 5 that moves forward and backward along both sides.

[0027] Using the above-mentioned alumina microbead green body forming device to prepare alumina microbead green bodies and finished products:

[0028] Weigh the industrial raw material α-Al 2 O 3 86kg, Y 2 O 3 2kg, SiO 2 2kg of powder, mixed with 1.2kg of ammonium citrate and 11.5kg of water after ball milling, adding 1.3kg of polyacrylic acid, stirring the ball milling for 2 hours,...

Embodiment 2

[0030] Example 2: Preparation and molding device of black zirconia ceramic beads

[0031] See figure 1 and image 3 .

[0032] Black zirconia ceramic microbeads forming device: high-position storage tank 1 and titration vessel 3 are connected by pipes, titrator 3 is fixedly connected with vibrator 14, and the bottom of titrator 3 is provided with Φ0.8mm titration hole 12, titration hole 12 The lower part is provided with an arc-shaped guide body 13A. A collection tank 6 containing glycerin 7 is installed under the titrator 3. The collection tank 6 is equipped with a heating device 9 outside, and the collection tank 6 is equipped with a sieve with an upper opening made of a removable stainless steel mesh. Screen frame 5.

[0033] The black zirconia ceramic microbead green body and the finished product are prepared by using the above-mentioned black zirconium ceramic microbead forming device:

[0034] Weigh 70kg of zirconia powder mixed with yttrium oxide and 5kg of zirconium carbide p...

Embodiment 3

[0036] Example 3: Preparation of silicon nitride ceramic beads and its forming device

[0037] See figure 1 , figure 2 with Figure 4 .

[0038] The silicon nitride ceramic microbead green body forming device, the slurry storage tank 1 and the titration vessel 3 are connected by a pipe, the titrator 3 is fixedly connected with the vibrator (15), the bottom of the titrator 3 is provided with a Φ0.5mm titration hole 12, the titration hole The lower part of 12 is provided with a needle-shaped guide body 14, a collection tank 6 containing glycerin 7 is installed under the titrator 3, and the collection tank 6 is equipped with a heating device 9 outside, and the collection tank 6 is equipped with a screen 5 that moves forward and backward along both sides. , Wherein the screen 5 has a vertical folding edge 11 on both sides along the length direction, and a plurality of baffles 10 perpendicular to the screen 6 are arranged between the two folding edges 11.

[0039] The black zirconia mi...

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Abstract

The invention relates to a forming method and device of a ceramic micro-bead green body, belonging to the technical field of structural ceramics. The forming method of the ceramic micro-bead green body comprises the following steps of: preparing suspended slurry by adopting ammonium citrate and polyacrylic acid, forming liquid beads via a titrator, enabling the liquid beads to drip into hot glycerin in a collecting tank for forming beads, and solidifying to form the micro-bead green body. The forming device of the ceramic micro-bead green body is as follows: a slurry storage tank is connected with the titrator, a titration hole is arranged at the bottom of the titrator, the collecting tank containing the glycerin is arranged below the titrator, the collecting tank is provided with a heating device, and a screen mesh is arranged in the collecting tank. According to the forming method disclosed by the invention, slurry prepared by safe and non-toxic raw and auxiliary materials, and the beads are formed in the hot glycerin and solidified. The forming method and device has the advantages of simple equipment, convenience in operation, good quality of the formed beads, high efficiency and capability of realizing continuous production. The forming method and device which has the benefits of safety, environmental protection, simplicity in operation and high efficiency is provided for forming the ceramic micro-bead green body.

Description

Technical field [0001] The invention relates to a molding method and device for preparing ceramic microbead green bodies, and belongs to the technical field of structural ceramics. Background technique [0002] Ceramic beads are solid spherical objects with a diameter of less than 5 mm. They are widely used as grinding media in the preparation of ultra-fine powders. They are also used for ballpoint pen beads. Because of the small diameter, it is difficult to form. Traditional ceramic ball molding methods include mechanical pressing, granulation-rolling, extrusion-rolling, melting, and sol-gel. When preparing ceramic beads with precise size and high density, these methods have many shortcomings, such as low efficiency, insufficient spherical roundness, complex equipment, and large personnel investment. [0003] The Chinese patent "Method and device for preparing ceramic beads" with the patent number ZL02125221.1 provides a method and device for preparing ceramic beads. The disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622
Inventor 龚斌胡志军刘革命杨惠明李联和王文平谢楠胡一飞彭牛生
Owner GANZHOU KOIN STRUCTURE CERAMICS
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