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A method for sintering nozzle zirconium core at low temperature

A technology of low-temperature sintering and nozzle, which is applied in the field of making zirconium cores for continuous casting of molten steel. It can solve the problems of large equipment loss, long production cycle, and long heating time of the kiln, so as to reduce production costs, improve production efficiency, and shorten the firing rate. the effect of time

Active Publication Date: 2015-08-05
泰州市旺鑫耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small difference between the sintering temperature and the flame combustion temperature, it takes a long time to heat up the kiln. Therefore, sintering at high temperature will result in high energy consumption, long production cycle, large equipment loss and low production efficiency.
Some researchers have proposed that when the particle size of zirconia powder is reduced to the nanometer scale, the sintering of zirconia can be realized at a relatively low temperature due to the huge specific surface area and high activity of the nano-powder. The cost of powder is much higher than that of micron powder, resulting in a sharp drop in economic benefits. Therefore, this solution cannot be popularized and applied in the field of zirconia refractories

Method used

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  • A method for sintering nozzle zirconium core at low temperature
  • A method for sintering nozzle zirconium core at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) According to the first step of the technical plan, configure the sintering aid and grind it to ~2μm for later use;

[0016] 2) Weigh 5g of prepared sintering aid, add 1Kg particle size (D 50 ) is about 6~40μm stabilized ZrO 2 In the powder, after fully mixing, add a certain amount of deionized water and polyvinyl alcohol (PVA), mix and ball mill for 1 hour;

[0017] 3) After the powder is dried and sieved, press a hydraulic press to form a biscuit with a zirconium nozzle core with an inner diameter of Φ17mm;

[0018] 4) Dry the pressed green body at 150°C for 3 hours;

[0019] 5) Put the dried biscuits in the kiln, raise the temperature to 1650°C, and keep it warm for 2~4 hours to complete the sintering.

Embodiment 2

[0021] 1) According to the first step of the technical plan, configure the sintering aid and grind it to ~2μm for later use;

[0022] 2) Weigh 10g of the prepared sintering aid, add 1Kg particle size (D 50 ) is about 6~40μm stabilized ZrO 2 In the powder, after fully mixing, add a certain amount of deionized water and polyvinyl alcohol (PVA), mix and ball mill for 1 hour;

[0023] 3) After the powder is dried and sieved, press a hydraulic press to form a biscuit with a zirconium nozzle core with an inner diameter of Φ17mm;

[0024] 4) Dry the pressed green body at 150°C for 3 hours;

[0025] 5) Put the dried biscuits in the kiln, raise the temperature to 1600°C, and keep it warm for 2~4 hours to complete the sintering.

Embodiment 3

[0027] 1) According to the first step of the technical plan, configure the sintering aid and grind it to ~2μm for later use;

[0028] 2) Weigh 20g of prepared sintering aid, add 1Kg particle size (D 50 ) is about 6~40μm stabilized ZrO 2 In the powder, after fully mixing, add a certain amount of deionized water and polyvinyl alcohol (PVA), mix and ball mill for 1 hour;

[0029] 3) After the powder is dried and sieved, press a hydraulic press to form a biscuit with a zirconium nozzle core with an inner diameter of Φ17mm;

[0030] 4) Dry the pressed green body at 150°C for 3 hours;

[0031] 5) Put the dried biscuits in the kiln, raise the temperature to 1550°C, and keep it warm for 2~4 hours.

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Abstract

A low-temperature sintering method of a nozzle zirconium core comprises the steps: preparing an Al2O3-MgO-SiO2 system sintering aid, performing mixing granulation on the sintering aid and stabilization processed micron-degrade ZrO2 powder, performing compression molding, drying a molded blank, and then keeping warm at 1500-1650 DEG C for 4 h to obtain compactly sintered zirconium core. When zirconia powder mixed with the sintering aid is sintered at 1300 DEG C or more, because of the fusing of the sintering aid, the blank is rapidly compacted and the low-temperature liquid-phase sintering is finished. Compared with conventional technology that a zirconia blank is subjected to high-temperature solid-phase sintering at 1700 DEG C or more for a long time, the method is capable of effectively reducing energy consumption, shortening production period and reducing comprehensive cost.

Description

technical field [0001] The invention relates to a method for sintering a nozzle zirconium core at a low temperature, which is used for making a nozzle zirconium core for continuous casting of molten steel. Background technique [0002] Zirconia ceramic materials have excellent properties such as high toughness, thermal shock resistance, and high temperature corrosion resistance. In recent years, they have been widely used to make core tubes for nozzles in continuous casting of molten steel. At present, the zirconium core of the molten steel continuous casting nozzle is basically sintered by a high-temperature solid-phase sintering system at 1700 ° C to 1780 ° C for 6 to 8 hours. Because the difference between the sintering temperature and the flame combustion temperature is small, the heating time of the kiln is long, so sintering at high temperature results in high energy consumption, long production cycle, large equipment loss and low production efficiency. Some researche...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/63
Inventor 高桂航宋振亚
Owner 泰州市旺鑫耐火材料有限公司