Method for preparing Mo-ZrO2 metal ceramic electrode by utilizing sol-gel method

A cermet, mo-zro2 technology, applied in other manufacturing equipment/tools, mechanical equipment, turbines, etc., can solve the problems of uneven distribution of electrode metal phase, inconsistent evaporation and sedimentation, increase electrode cost, etc., to improve electrical conductivity and performance. High temperature structural performance, high temperature structural performance improvement, and the effect of reducing electrode cost

Inactive Publication Date: 2013-01-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the currently commonly used preparation of Mo-ZrO 2 The method of cermet electrode is ball milling mixing-cold pressing-sintering method, but this method has disadvantages such as uneven mixing and inconsistent evaporation and sedimentation after mixing, which eventually leads to problems such as uneven distribution of electrode metal phases
And the commonly used method requires the particle size of the material to be nanometer or submicron, which also increases the cost of the electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The specific implementation steps of this embodiment are as follows:

[0021] Get 10.2808g ammonium heptamolybdate to be made into the aqueous solution of 15-40wt%, get 25.0000g zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O) Prepared as 15-40wt% aqueous solution. Mix the two to produce a white transparent solution, add 36.7104g citric acid (C 6 h 8 o 7 ·H 2 O), the molar ratio of citrate ions and metal cations in the citric acid solution was 1.5:1, and the white precipitate disappeared to produce a transparent solution. Add nitric acid or ammonia water dropwise to adjust pH<1-2, and prepare sol in 80-90°C water bath. After aging for 3 hours, the transformation from sol to gel is realized, and then put it into a vacuum drying oven. The drying temperature should be higher than 100°C, but should not be too high, generally in the range of 110-130°C, and dry for 4 hours. Then burn in a muffle furnace at a temperature of 570°C to obtain a mixture of molybdenum ox...

Embodiment 2

[0024] Example 2: Present embodiment reduction, pressing, sintering process are identical with embodiment 1, and its difference is:

[0025] Get 10.2808g ammonium heptamolybdate and make 15-40wt% aqueous solution, add 36.7104g citric acid, then add 25.0000g zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O) Prepared into an aqueous solution with a concentration of 15-40wt%, that is, a white transparent solution will be produced. Add nitric acid or ammonia water dropwise to adjust pH<1-2, and prepare sol in 80-90°C water bath. After aging for 3 hours, the transformation from sol to gel was realized, and then it was put into a vacuum drying oven at a drying temperature of 130° C., but dried for 4 hours. Then burn in a muffle furnace at a temperature of 570°C to obtain a mixture of molybdenum oxide and zirconia.

Embodiment 3

[0026] Example 3: The aging, drying, burning, reduction, pressing, and sintering processes of this embodiment are the same as those of Example 1, except that:

[0027] Take 10.2808g of ammonium heptamolybdate and put it into a beaker, add distilled water to it to prepare a 15-40wt% aqueous solution, then add 5-6 drops of dilute nitric acid (dilute HNO 3 As the pH regulator of the initial solution), adjust PH3 ) 4 ·5H 2 O) Prepare a 15-40wt% aqueous solution until a white transparent solution is produced, then add citric acid, the molar ratio of citrate ions and metal cations in the citric acid solution is 1.5:1. The sol was prepared in a water bath at 80-90°C.

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Abstract

The invention discloses a method for preparing a Mo-ZrO2 metal ceramic electrode by utilizing a sol-gel method. The method comprises the following steps: utilizing ammonium molybdate, zirconium nitrate, citric acid and nitric acid or ammonia water to adjust pH value; preparing a sol in 80-90 DEG C water bath; realizing the conversion from sol to gel after aging for a period of time; placing the gel into a vacuum drying oven and drying for 3-4h, wherein the drying temperature is above 100 DEG C, but cannot be too high and generally is within a scope of 110-130 DEG C; firing the dry gel in a muffle furnace, thereby forming a mixture of molybdenum oxide and zirconium oxide; reducing for 2-3 hours in a hydrogen furnace respectively at 560-580 DEG C and at 960-980 DEG C; cold-pressing and molding the reduced molybdenum and zirconium oxide compound material under a pressure; and firing and forming in an inert gas shielding furnace. According to the method, the molybdenum and the zirconium oxide are more uniformly mixed, a netted structure formed by the metal molybdenum is benefited and the conductivity is further promoted.

Description

technical field [0001] The invention relates to a method for preparing a cermet electrode material, which belongs to the field of composite materials, in particular to a method for preparing Mo-ZrO by using a sol-gel method 2 Method for metal-ceramic electrodes. Background technique [0002] In the metallurgical deoxidation process, Zhou Guozhi et al. invented the electrochemical non-polluting deoxidation method of molten metal, using slag as a channel for the outward transmission of dissolved oxygen in metals, and applying an external electric field on the molten metal and slag to control and accelerate the conduction of oxygen ions , so as to realize pollution-free deoxidation, such as publication numbers CN1453371A, CN101235430A and other Chinese invention patents. Requirements for the electrodes used in the metal liquid electrochemical pollution-free deoxidation method: high temperature resistance, oxidation resistance, metal liquid and molten salt corrosion resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F5/00
Inventor 唐磊郭艳玲张捷宇曾涛阮飞许继芳李建超王磊
Owner SHANGHAI UNIV
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