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Preparation method of thermal spraying powder for ferrite corrosion-resistant coating

A technology of thermal spraying and powder, which is applied in the field of preparation of nickel ferrite (NiFe2O4) thermal spraying powder, which can solve the problem that nickel ferrite powder cannot meet the requirements of thermal spraying powder, complex production process and equipment, Problems such as poor crystallization state of crystal grains, to achieve the effect of simple and controllable process flow and equipment, good crystallization state of crystal grains, and uniform distribution of grain size

Active Publication Date: 2013-08-07
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the methods for preparing ferrite powder include: chemical co-precipitation method, hydrothermal method, sol-gel method, self-propagating method, etc., but the production process and equipment of the above methods are complicated, and there is no industrial product in China at present, and The prepared nickel ferrite powder is difficult to meet the requirements of thermal spraying powder, and the preparation method of thermal spraying powder for nickel ferrite anti-corrosion coating needs further study
China Surface Engineering 2012 Volume 25 Issue 3 "Plasma Spraying Preparation of DC Grounding Electrode Steel Matrix NiFe 2 o 4 Anti-corrosion coating" adopts the solid state reaction method combined with the agglomeration-crushing method to synthesize the plasma sprayed NiFe 2 o 4 Powder, its NiFe 2 o 4 The average bonding strength between the coating and the substrate is 21.8MPa, and the average resistivity of the coating is about 3.60×10 -2 Ω·cm, the direct current electrolytic corrosion rate is about 1.86g / (A·a), but the particle size distribution of the obtained powder is uneven, and the crystallization state of the crystal grains is not good. problem still to be solved

Method used

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  • Preparation method of thermal spraying powder for ferrite corrosion-resistant coating
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  • Preparation method of thermal spraying powder for ferrite corrosion-resistant coating

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The purity is 99.9% Fe 2 o 3 and NiO powder with a purity of 99.9% are placed in a ball mill tank at a ratio of 2:1, and ZrO is added 2 Grinding balls and ball milling medium (concentration: 75% industrial alcohol), the ratio of ball to material is 4:1, the speed of ball milling is 400r / min, and the milling time is 6 hours. Using a rotary evaporator to perform high-temperature rotary evaporation on the slurry obtained by ball milling to obtain Fe 2 o 3 Mix the powder with NiO, and then place it in a high-temperature drying oven for 24 hours to obtain dry Fe 2 o 3 Mix powder with NiO. The evaporation temperature is 80°C, the rotation speed is 100r / min, and the drying oven temperature is 120°C. The resulting dry Fe 2 o 3 Mix powder with NiO and pass through 300 mesh sieve. Use a high temperature sintering furnace to calcine the sieved powder to synthesize NiFe 2 o 4 For high-purity powder, the calcination temperature is 1200°C, the calcination time is 1.5 hours...

Embodiment 2

[0038] The purity is 99.9% Fe 2 o 3 and NiO powder with a purity of 99.9% are placed in a ball mill jar at a molar ratio of 1:1, and ZrO is added 2 Grinding balls and ball milling medium (concentration: 75% industrial alcohol), the ball-to-material ratio is 4:1, the ball milling speed is 400r / min, and the ball milling time is 8 hours. Using a rotary evaporator to perform high-temperature rotary evaporation on the slurry obtained by ball milling to obtain Fe 2 o 3 Mix the powder with NiO, and then place it in a high-temperature drying oven for 36 hours to obtain dry Fe 2 o 3 Mix powder with NiO. The evaporation temperature is 70°C, the rotation speed is 100r / min, and the drying oven temperature is 110°C. The resulting dry Fe 2 o 3 Mix powder with NiO and pass through 300 mesh sieve. Use a high temperature sintering furnace to calcine the sieved powder to synthesize NiFe 2 o 4 For high-purity powder, the calcination temperature is 1050°C, the calcination time is 4 hou...

Embodiment 3

[0041] Fe with a purity of 99.9% 2 o 3 and NiO powder in a ratio of 1.5:1 and placed in a ball mill tank, and added ZrO 2 Grinding balls and ball milling medium (concentration: 75% industrial alcohol), the ratio of ball to material is 4:1, the speed of ball milling is 400r / min, and the milling time is 6 hours. Using a rotary evaporator to perform high-temperature rotary evaporation on the slurry obtained by ball milling to obtain Fe 2 o 3 Mix the powder with NiO, and then place it in a high-temperature drying oven for 24 hours to obtain dry Fe 2 o 3 Mix powder with NiO. The evaporation temperature is 80°C, the rotation speed is 100r / min, and the drying oven temperature is 120°C. The resulting dry Fe 2 o 3 Mix powder with NiO and pass through 300 mesh sieve. Use a high temperature sintering furnace to calcine the sieved powder to synthesize NiFe 2 o 4 For high-purity powder, the calcination temperature is 1100°C, the calcination time is 3 hours, and the calcination a...

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Abstract

The invention relates to the technical field of thermal spraying powder and provides a preparation method of thermal spraying powder for a ferrite corrosion-resistant coating. The thermal spraying powder is NiFe2O4 powder for thermal spraying. The preparation method comprises the following steps of ball milling, evaporation, drying, grinding, sieving, calcination, agglomeration and granulation. The preparation method is simple and controllable, has low equipment requirements and a low cost, is convenient for operation, has a high powder yield, and is suitable for mass production of NiFe2O4 thermal spraying powder. The NiFe2O4 powder has high purity, a regular shape, a good crystal grain crystallization state, and uniform crystal grain size distribution. The coating prepared by a plasma spraying technology has good compactness and combinability, and is used as a protection coating of an AC grounding material. Compared with a carbon steel grounding material, the AC grounding material with the protection coating has greatly improved corrosion resistance.

Description

【Technical field】 [0001] The invention relates to the technical field of thermal spraying powder, in particular to a nickel ferrite (NiFe 2 o 4 ) Preparation method of thermal spray powder. 【Background technique】 [0002] With its excellent corrosion resistance and good conductivity, nickel ferrite material, as a new generation of environmentally friendly and anti-corrosion electrode materials, can be used as corrosion-resistant grounding materials for power transmission and transformation projects, and has attracted extensive attention in the power industry in recent years. The rapid development of thermal spraying technology provides a good foundation for the preparation and application of high-performance nickel ferrite coatings. In recent years, the methods for preparing ferrite powder include: chemical co-precipitation method, hydrothermal method, sol-gel method, self-propagating method, etc., but the production process and equipment of the above methods are complicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/26
Inventor 祝志祥韩钰马光聂京凯杨富尧卢云深陈新
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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