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Method for uniformly refining low-temperature lead-free glass powder by using ultrahigh-pressure microjet and application thereof

A lead-free glass powder and micro-jet homogenization technology, applied in the chemical industry, can solve the problems of inconsistent particle size and distribution of oxide powder, uneven particle size, and difficult control of fineness, etc., to overcome long grinding time, Highly uniform particle size and low cost

Active Publication Date: 2021-07-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inconsistent particle size and distribution of various oxide powders, there are large differences in powder hardness.
The above methods have problems such as long grinding time, low grinding efficiency, wide particle size distribution, uneven particle size, and difficulty in controlling the fineness specified by the process.

Method used

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  • Method for uniformly refining low-temperature lead-free glass powder by using ultrahigh-pressure microjet and application thereof
  • Method for uniformly refining low-temperature lead-free glass powder by using ultrahigh-pressure microjet and application thereof
  • Method for uniformly refining low-temperature lead-free glass powder by using ultrahigh-pressure microjet and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, a method for uniformly refining low-temperature lead-free glass powder using ultra-high pressure micro-jet comprises the following steps:

[0030] (1) according to following composition and mass percentage composition, the initial powder of preparation low-temperature lead-free glass powder, as raw material:

[0031] Bi 2 o 3 :70.0wt%, ZnO:22.5wt%, Sb 2 o 3 : 1.0wt%, SiO 2 :2.3wt%, CuO: 1.6wt%, Al 2 o 3 : 2.2wt%, Mn 3 o 4 :0.4wt%;

[0032] (2) Mix the above raw materials, deionized water and dispersant according to the mass ratio of 1000:800:5, use high-speed dispersion to pre-disperse for 15 minutes, and set the pre-dispersion rate to 900r / min. The jet homogenizer performs homogenization treatment 5 times, and the treatment pressure is set at 80MPa; after the homogenization treatment process is completed, it is filtered through a 300-mesh screen to obtain a slurry of low-temperature lead-free glass powder with stable dispersion.

[0033] A...

Embodiment 2

[0037] In this embodiment, a method for uniformly refining low-temperature lead-free glass powder using ultra-high pressure micro-jet comprises the following steps:

[0038] (1) according to following composition and mass percentage composition, the initial powder of preparation low-temperature lead-free glass powder, as raw material:

[0039] Bi 2 o 3 :70.0wt%, ZnO:22.5wt%, Sb 2 o 3 : 1.0wt%, SiO 2 :2.3wt%, CuO: 1.6wt%, Al 2 o 3 : 2.2wt%, Mn 3 o 4 :0.4wt%;

[0040] (2) Mix the above raw materials, deionized water and dispersant according to the mass ratio of 1000:800:5, use high-speed dispersion to pre-disperse for 15 minutes, and set the pre-dispersion rate to 1000r / min. The jet homogenizer performs homogenization treatment 3 times, and the treatment pressure is set at 110MPa; after the homogenization treatment process is completed, it is filtered through a 300-mesh screen to obtain a slurry of low-temperature lead-free glass powder with stable dispersion.

[0041]...

Embodiment 3

[0045] In this embodiment, a method for uniformly refining low-temperature lead-free glass powder using ultra-high pressure micro-jet comprises the following steps:

[0046] (1) according to following composition and mass percentage composition, the initial powder of preparation low-temperature lead-free glass powder, as raw material:

[0047] Bi 2 o 3 :72.5wt%, ZnO: 19.0wt%, Sb 2 o 3 :1.5wt%, SiO 2 :2.6wt%, CuO: 1.6wt%, Al 2 o 3 : 2.2wt%, Mn 3 o 4 :0.6wt%;

[0048] (2) Mix the above raw materials, deionized water and dispersant according to the mass ratio of 1000:800:5, use high-speed dispersion to pre-disperse for 15 minutes, and set the pre-dispersion rate to 1000r / min. The jet homogenizer performs homogenization treatment 3 times, and the treatment pressure is set at 110MPa; after the homogenization treatment process is completed, it is filtered through a 300-mesh screen to obtain a slurry of low-temperature lead-free glass powder with stable dispersion.

[0049]...

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Abstract

The invention discloses a method for uniformly refining low-temperature lead-free glass powder by using an ultrahigh-pressure microjet technology and application thereof. Glass powder, deionized water and a dispersing agent are mixed according to the mass ratio of 1000: (500-1200): (5-30) for pre-dispersion, pre-dispersed slurry is emulsified and dispersed by using an ultrahigh-pressure microjet homogenizer, and then water-based low-temperature lead-free glass powder slurry is obtained. The side surface of a ZnO resistor disc is uniformly coated with the slurry by adopting spraying equipment, and sintering treatment is carried out to obtain a low-temperature lead-free insulating coating on the side surface of the resistor disc. The glass powder does not contain harmful substances such as lead and is environment-friendly. Grinding media such as ball-milling beads are not needed in the preparation process, the process is simple, the homogenization treatment time is short, and the dispersion efficiency is high. The particle size height is uniform and the particle size distribution is narrow. The obtained side insulating coating is compact and uniform, and has excellent high-current impact resistance.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and in particular relates to a method for uniformly refining low-temperature lead-free glass powder by using ultra-high pressure micro-jet technology and an application thereof. This process technology can realize uniform refinement of low-temperature lead-free glass powder. Applying it to the preparation of the side glaze of ZnO resistors can obtain an inorganic side insulating coating that is dense, uniform, and resistant to high-current shocks. Background technique [0002] Metal Oxide Arrester (MOA) is an important overvoltage protection device in power system. The ability of MOA resistive sheet to withstand 4 / 10μs high current impact directly affects the protection level of the arrester. The dielectric strength of the glaze on the side of the resistor is one of the key parameters for evaluating the high current resistance performance. Glass glaze is a commonly used insulating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00C04B41/85
CPCC03C12/00C04B41/5022C04B41/85C04B41/009C04B41/4543C04B35/453
Inventor 金鹿江姚政施利毅任鑫余文琪
Owner SHANGHAI UNIV
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