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Ceramic beads with smooth surfaces and manufacturing method thereof

一种制造方法、陶瓷珠的技术，应用在陶瓷珠领域，能够解决爆裂、低耐磨性、复杂工艺等问题，达到高生产率的效果

Inactive Publication Date: 2011-11-16
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the problem that the particles distributed in the area surrounding the hot plasma and through which the shielding gas flows are not melted and coexist as particles with low abrasion resistance
However, these methods not only involve complicated processes but also have the disadvantage that when the raw material powder has pores, the particles burst when melted or voids are formed during the melting process, thereby creating an obstacle that makes it difficult to sufficiently spheroidize the particles

Method used

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  • Ceramic beads with smooth surfaces and manufacturing method thereof
  • Ceramic beads with smooth surfaces and manufacturing method thereof
  • Ceramic beads with smooth surfaces and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] use figure 1 The apparatus configuration shown produces ceramic beads.

[0147] Partially stabilized zirconia powder containing yttrium oxide (3 mol %) obtained by granulation by in-liquid granulation and sintering and having an average particle diameter of 50 μm was introduced into the powder supplier 101 as a raw material. When supplying argon gas 109 at a flow rate of 3.0SLM, supplying argon gas 111 at a flow rate of 2SLM, supplying a plasma gas 110 composed of nitrogen and 20% hydrogen added to nitrogen at a flow rate of 6SLM, and supplying 24kW (160V×150A) In the state of electric power, a laminar flow of hot plasma is generated.

[0148] Subsequently, the raw material powder is supplied into a quartz tube 118 with an inner diameter of 2 mm at a rate of 20 g / min by means of a powder feeder 101 using a carrier gas 100, wherein the carrier gas 100 is nitrogen introduced at 6 SLM, and the quartz tube 118 is Arranged in a tubular electric furnace 105 with a length o...

Embodiment 2

[0155] The powder was supplied for 10 minutes under the same conditions as in Example 1 except that nitrogen carrier gas 100 was introduced at 4 SLM. The flow velocity of the carrier gas injected in this operation was estimated to be 90 m / sec using equation (1), and the discharge angle was 71°. The partially stabilized zirconia beads obtained were removed by filtration and dried.

[0156] The surface and cross section of the obtained partially stabilized zirconia beads were observed by SEM. As a result, it was found that most of the fine particles on the surface of the beads disappeared by melting, and the surface was smoothed. Thereby, a more uniform spherical shape is obtained, and the ratio of smooth beads is 95% or more. Neither surface crack defects due to thermal shock nor bead breakage due to thermal shock were observed. The internal void ratio is 5%. In addition, the abrasiveness of the beads was evaluated, and as a result, the amount of zirconia was found to be 0....

Embodiment 3

[0159] The powder was supplied for 10 minutes under the same conditions as in Example 1 except that nitrogen carrier gas 100 was introduced at 10 SLM. The flow velocity of the carrier gas injected in this operation was estimated to be 230 m / sec using equation (1). The partially stabilized zirconia beads obtained were removed by filtration and dried.

[0160] The surface and cross section of the obtained partially stabilized zirconia beads were observed by SEM. As a result, it was found that most of the fine particles on the surface of the beads disappeared by melting, and the surface was smoothed. Thereby, a more uniform spherical shape is obtained, and the ratio of smooth beads is 95% or more. Neither surface crack defects due to thermal shock nor bead breakage due to thermal shock were observed. The internal void ratio is 3%. In addition, the abrasiveness of the beads was evaluated, and as a result, the amount of zirconia was found to be 0.1 ppm, where 0.1 ppm was the li...

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Abstract

Provided are a ceramic bead manufacturing method for obtaining ceramic beads with smooth surfaces using a simpler method without using any complicated processes, such as combining a DC plasma and a high-frequency plasma or using a two-stage high-frequency plasma, and the ceramic beads. A preheated starting ceramic material is introduced into a thermal plasma wherein a laminar flow is formed using a high-voltage type direct-current (DC) plasma gun, and is cooled and solidified, and ceramic beads are then collected. It is preferable that a starting material powder that is preheated by being passed through a furnace through which a heat-resistant pipe runs while the starting ceramic material is fed using a carrier gas be introduced into the thermal plasma, and that the plasma treatment be applied under conditions at which the ceramic beads are discharged at a discharge angle of 60 DEG or greater with respect to the thermal plasma. As a result, good ceramic beads with smooth surfaces and without flaws such as cracks or internal voids in the beads can be obtained.

Description

technical field [0001] The present invention relates to a ceramic bead suitable for use in, for example, a bead mill and a method of manufacturing the ceramic bead. Background technique [0002] Bead milling is known as a technique for mixing and / or deaggregating fine ceramic powders (see, eg, Patent Document 1). Beads used in bead mills are required to have high wear resistance in order to minimize contamination by bead material due to bead wear (see, for example, Patent Documents 2 and 3). [0003] As one method of enhancing the wear resistance of beads, a technique of producing spherical powder using thermal plasma has been disclosed (see, for example, Patent Documents 4 and 5). In this technique of producing spherical powder using thermal plasma, since radio frequency plasma is generated in a wide area, radio frequency plasma is mainly used (see, for example, Patent Documents 5, 6 and 7). In the radio frequency plasma method, particles that have passed through a high-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02B01J19/08
CPCC04B2235/5481B01J2219/0879C04B2235/5436C04B35/62665C04B2235/77C04B2235/963C04B2235/3225C04B2235/3246C01G25/02C04B2235/528B01J19/088B01J2219/0894C04B35/486B01J19/08C04B35/48Y10T428/2982
Inventor 向后雅则高桥小弥太
Owner TOSOH CORP