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Injection moulding method for preparing zirconia tube of metallurgic oxygen sensor

A zirconia tube, injection molding technology, applied in the direction of instruments, scientific instruments, material electrochemical variables, etc., can solve the problems of large fluctuations, poor product reproducibility, inability to meet high-performance metallurgical oxygen sensors, etc., and achieve high injection pressure. , Good reproducibility, stable and controllable preparation process

Inactive Publication Date: 2006-07-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that because this technology uses paraffin as a binder, it must be removed before sintering, the time is long, the energy consumption is high, and improper control will cause defects, thus limiting the thickness of the part, and the pressure during the injection process is small and fluctuates greatly , the reproducibility of the product is poor, and it cannot meet the requirements of high-performance metallurgical oxygen sensor
The molding pressure of isostatic pressing technology is significantly higher than that of hot pressing injection, but it is difficult to achieve dimensional accuracy for product quality control, especially for samples with complex shapes, so there is still a certain gap in the preparation of high-performance oxygen constant sensors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, according to the percentage by weight, take 10% of polyethylene, 20% of vegetable oil, 1% of oleic acid, and the balance is paraffin, and mix uniformly at 130~160°C; the binder and zirconia powder are 20% by weight: The ratio of 80% is mixed in the mixer for more than 1 hour to ensure that the mixture is fully uniform, and the pellets suitable for injection molding are obtained through the granulator; then put into the injection machine, the injection pressure is 15Mpa, the temperature is 120 ℃ , the mold temperature is at room temperature, and the green body of the zirconia tube is obtained; the green body of the zirconia tube is degreased for 3 days, and the final temperature of the degreasing is controlled at 880°C; finally, the zirconia tube is put into the oxidized The aluminum crucibles are arranged upright with the open ends facing down, then put into a high-temperature furnace, calcined at 1730°C for 2 hours, and cooled to 1000°C for 9 hours to obta...

Embodiment 2

[0013] Embodiment 2, according to weight percentage, get polyethylene 20%, vegetable oil 40%, oleic acid 1%, surplus is paraffin, mixes evenly at 130~160 ℃; Meal binder and zirconia powder are according to weight percentage 15: The ratio of 85 is mixed in the mixer for more than 1 hour to ensure that the mixture is fully uniform, and the pellets suitable for injection molding are obtained through the granulator; then put into the injection machine, the injection pressure is 30Mpa, the temperature is 140 ℃ , the mold temperature is at room temperature, and the green body of the zirconia tube is obtained; the green body of the zirconia tube is degreased for 3 days, and the final temperature of the degreasing is controlled at 880°C; finally, the zirconia tube is put into the oxidized The aluminum crucibles are arranged upright with the open ends facing down, then put into a high-temperature furnace, calcined at 1730°C for 2 hours, cooled to 1200°C for 5 hours, and obtained the zir...

Embodiment 3

[0014] Embodiment 3: According to weight percentage, take polypropylene 20%, vegetable oil 30%, oleic acid 1%, balance is paraffin. Mix evenly at 130-160°C; mix the binder and zirconia powder according to the ratio of 25:75 by weight, and mix in the mixer for more than 1 hour to ensure that the mixture is fully uniform; then put it into the injection machine, Under the conditions of injection pressure of 70Mpa, temperature of 100°C, and mold temperature at room temperature, the green body of the zirconia tube is obtained by injection molding; the green body of the zirconia tube is put into a vacuum degreasing furnace to remove organic matter, and slowly heated under vacuum conditions to make the green body of the zirconia tube The organic matter in the biscuit is gradually removed, and the temperature at the end of the degreasing can be controlled at about 900°C; finally, the zirconia tube is placed in an alumina crucible, with the open end facing down and vertically arranged, ...

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Abstract

Disclosed is a method for making zirconium oxide pipe with injection modeling as metallurgy, which comprises: mixing MgO part stable zirconium oxide powder with binding agent, getting the base of the zirconium oxide tube after being injected, getting the metallurgy zirconium oxide with certain oxide after degreasing and sintering. The making method comprises: according to weight percentage, getting polyethylene or polypropylene 10~30%, vegetable oil 10~40%, oleic acid 1~5%, and the other is ceresin wax, mixing them under 130~160íµ; making materials of binding agent and zirconium oxide powder according to weight percentage (15~25)%: (85~75)%.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation technology of a zirconia tube, a key component used in an electrochemical sensor for rapidly measuring dissolved oxygen in molten steel, molten copper, and the like. Background technique [0002] The steelmaking process is a complex physical and chemical process, and its important link is to accurately measure and control the temperature and oxygen level of molten steel. In the late 1960s, solid electrolyte oxygen determination technology began to be applied to steel production, which promoted the research and development of molten steel oxygen determination sensors, making it suitable for various types of steelmaking furnaces, ladles, tundishes, continuous casting, It is used in production processes such as degassing devices. The dynamic oxygen determination technology of molten steel is detected during the process of molten steel smelting, refining, and...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/409B29C45/00B29K103/06
Inventor 孔祥华汪君刘新彬
Owner UNIV OF SCI & TECH BEIJING
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