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Nickel ferrite-copper metal ceramic inert anode material and preparation method

A technology of inert anode and nickel ferrite, which is applied in the field of nickel ferrite-copper cermet inert anode material and preparation technology, can solve problems such as Ni electrochemical corrosion, achieve the improvement of electrical conductivity and thermal shock resistance, and improve the microstructure The effect of uniformity, electrical conductivity and thermal shock resistance improvement

Inactive Publication Date: 2012-10-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the main method to improve the wettability between copper melt and nickel ferrite is to add metal Ni to the metal, but Ni is prone to electrochemical corrosion during the electrolysis process.
There is no report on the preparation of nickel ferrite-copper cermets by infiltration

Method used

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  • Nickel ferrite-copper metal ceramic inert anode material and preparation method
  • Nickel ferrite-copper metal ceramic inert anode material and preparation method
  • Nickel ferrite-copper metal ceramic inert anode material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Adding copper oxide to improve the wettability of nickel ferrite and copper melt

[0034] The nickel ferrite ceramic powder was prepared by high temperature solid phase sintering synthesis method. The synthetic powder was crushed by ball milling, then pressed, degreased, and sintered in a nitrogen atmosphere at 1350°C for 4 hours to obtain a ceramic sample with a density of more than 96%. The sintered samples were cut and sampled, and oxidized in air at 1000°C for 72 hours after polishing. Mix cuprous oxide and copper at a mass ratio of 8:92, and copper oxide and copper at a mass ratio of 4:96, respectively, and press to form. The wetting angle between nickel ferrite and copper melt was measured by the sessile drop method, and the atmosphere was a nitrogen atmosphere with an oxygen partial pressure of 10Pa. The temperature was raised from room temperature to 1050°C at a rate of 10°C / min, and then at a rate of 2°C / min. When the temperature rises to 1150°C, ...

Embodiment 2

[0035] Embodiment 2: Control the sintering atmosphere to improve the wettability of nickel ferrite and copper melt

[0036] Nickel ferrite ceramic powder was prepared by high-temperature solid-phase sintering synthesis method. The synthetic powder was crushed by ball milling, then pressed, degreased, and sintered in a nitrogen atmosphere at 1350°C for 4 hours. The sintered sample was cut and sampled, and polished in the air at 1000°C. Medium oxidation for 72h. Copper powder is pressed into shape. The wettability of nickel ferrite and copper melt was measured by the sessile drop method, the atmosphere was a nitrogen atmosphere with an oxygen partial pressure of 800Pa, and a heating rate of 3°C / min was adopted. When the temperature rises to 1150°C, the wetting angle can be reduced to 0°.

Embodiment 3

[0037] Example 3: Cu / NiFe 2 o 4 Preparation of -10NiO cermet material

[0038] The first step: raw material preparation

[0039] According to the designed ceramic phase and metal phase mass ratio, take NiFe respectively 2 o 4 -10NiO composite ceramic powder and metal copper, the average particle size of the ceramic powder is about 15 μm; the average particle size of the metal copper is about 8 μm;

[0040] The second step: billet

[0041] To NiFe 2 o 4 -10NiO composite ceramic powder is added with a forming agent, press-formed and degreased according to the conventional powder metallurgy blank-making process to obtain a degreased ceramic body; the degreasing temperature is 500°C, the holding time is 4 hours, and the heating rate is 1°C / min; NiFe 2 o 4 -10NiO composite ceramic degreased body was heated to 800°C, kept for 2 hours, and after cooling, a ceramic preform with a porosity of 36% was obtained;

[0042] Metal copper is cold-pressed and formed under a pressure o...

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Abstract

The invention relates to a nickel ferrite-copper metal ceramic inert anode material which comprises a ceramic phase and a metal phase, wherein the ceramic phase is nickel ferrite or nickel ferrite base composite ceramic; and the metal phase consists of metal copper and cuprous oxide, and the cuprous oxide accounts for 1-20% of the total mass of the metal phase. In the preparation process, the content of the cuprous oxide in the metal phase is controlled through controlling the oxygen partial pressure of a nitrogen protection atmosphere so as to improve the wettability of the nickel ferrite and the copper and achieve the sintering infiltration preparation of the ceramic phase and the metal phase. The metal phase and the ceramic phase of the nickel ferrite-copper metal ceramic inert anode material are in a three-dimensional reticular through structure, wherein the sintering density is higher than 98%, the electric conductivity of the metal ceramic material is more than 200S / cm at a temperature of 900 DEG C, the heat conductivity is up to 40W / (m.K) at the room temperature, and the metal ceramic material cannot be cracked through temperature difference thermal shock at the temperature of 400 DEG C. The problems of difficult sintering densification of the nickel ferrite and the copper, sintering overflow of the metal phase and material thermal shock and cracks are effectively solved, and compared with a material prepared by a conventional mixed powder sintering process, the electric conductivity and the thermal shock resistance of the nickel ferrite-copper metal ceramic material are greatly improved.

Description

technical field [0001] The invention discloses a nickel ferrite-copper cermet inert anode material and a preparation process, belonging to the technical field of composite material preparation. Background technique [0002] Oxide-based cermets have the advantages of strong corrosion resistance, good thermal stability, oxidation resistance, good electrical conductivity and thermal shock resistance of oxide ceramics, and are considered to be the most likely to replace the current carbon anode as a molten salt One of the inert anode materials for electrolysis (such as electrolytic aluminum). At present, the preparation of nickel ferrite-copper cermet materials mainly adopts the mixed powder sintering method. When the mixed powder sintering method is used to prepare this type of composite material, due to the poor wettability between the copper melt and nickel ferrite, and the temperature required for sintering and densification of the ceramic matrix is ​​higher than the meltin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/12C22C1/05C25C3/12
Inventor 周科朝陶玉强李志友张雷马莉
Owner CENT SOUTH UNIV
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