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Ceramic coating for protecting electrode substrate against high temperature melt erosion and its preparing method

A technology for protecting electrodes and ceramic coatings, applied in coatings, metal material coating processes, electrical components, etc., to achieve the effects of stable phase structure, high bonding strength, and excellent corrosion resistance.

Inactive Publication Date: 2005-09-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the method of using inert ceramic material coating shielding protection on the electrode surface made of molybdenum alloy or other high temperature alloy in electric arc furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Making zirconium silicate fine powder with a particle size of ≤10 μm into agglomerated spherical spray powder, wherein the content of the fine powder is ≥98wt%, and the binder makes up the balance.

[0029] 2. Surface roughening and activation treatment on the cylindrical surface of the molybdenum alloy rod to be sprayed;

[0030] 3. Spray zirconium silicate ceramic coating on the surface of the treated molybdenum alloy and superalloy by plasma powder spraying and gas explosion spraying, with a thickness of 0.5mm;

[0031] 4. After the coating is prepared, if dipping or brushing is used to coat the outer surface of the ceramic coating with a layer of phosphate or potassium silicate with a thickness of about 0.1 mm for sealing, the effect of the coating will be reduced. better.

Embodiment 2

[0033] 1. The fine powders of zircon and molybdenum disilicide with a particle size of ≤10 μm are respectively made into agglomerated spherical spray powders, wherein the content of the fine powders is ≥98wt%, and the binder makes up the balance.

[0034] 2. Sandblasting the cylindrical surface of the molybdenum alloy or other superalloy electrode rods to be sprayed;

[0035] 3. Use plasma powder spraying or other thermal spraying methods to spray a layer of molybdenum disilicide bottom layer on the cylindrical surface of molybdenum alloy or other high-temperature alloy electrode rods after sandblasting, with a thickness of 0.1-0.15mm;

[0036] 4. Use powder plasma spraying and gas explosion spraying methods to spray zircon ceramic coating on the molybdenum disilicide bottom layer, the total thickness is less than 0.7mm.

[0037] 5. After the coating is prepared, if dipping or brushing is used to coat the outer surface of the ceramic coating with a layer of phosphate or potass...

Embodiment 3

[0039] 1. Prepare zirconium silicate and molybdenum disilicide fine powder with a particle size of ≤10 μm into four agglomerated spherical spray powders with different components according to the following ratio, taking 1000 grams as an example

[0040] Zirconium silicate (ZrO 2 .SiO 2 ) Molybdenum disilicide (MoSi 2 )

[0041] a) 350-390 grams, 590-630 grams, the sum of the two materials ≥ 980 grams

[0042] b) 550-590 grams, 390-430 grams, the sum of the two materials ≥ 980 grams

[0043] c) 750-790 grams 190-230 grams, the sum of the two materials ≥ 980 grams

[0044] d) ≥980g

[0045] The binder makes up the balance.

[0046] 2. Sandblasting the cylindrical surface of the molybdenum alloy or other superalloy electrode rods to be sprayed;

[0047] 3. Use plasma powder spraying or other thermal spraying methods to spray a layer of molybdenum disilicide bottom layer on the cylindrical surface of molybdenum alloy or other high-temperature alloy electrode rods that have ...

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Abstract

The ceramic coating is agglomerated composite ceramic powder coating made of zirconium silicate or high-purity zirconite powder, and there may be molybdenum silicide underlayer and intermediate transition layer of composite powder including zirconium silicate or high-purity zirconite powder and molybdenum silicide. Through thermal spraying process, high temperature melt erosion resisting coating with thickness smaller than 0.7 mm is prepared on the surface of electrode base made of molybdenum alloy or other high temperature alloy. The molybdenum electrode with the coating has high temperature pore self-sealing effect, and thus 3-4 times higher melt erosion resisting capacity and prolonged service life. The technological process is simple and low in cost and can produce coating with stable performance.

Description

technical field [0001] The invention relates to the preparation of a layer of ceramic coating on the metal surface used in the high-temperature melt by using the energy generated by the high-energy plasma arc or flame, in particular to a composite ceramic for protecting the electrode substrate against high temperature, melt erosion and high temperature thermal shock Coatings and methods of preparation. Background technique [0002] To improve the service life of metals used in high-temperature melts, the use of surface ceramic coating protection technology is very significant. Under normal conditions, general ceramics are inert materials and do not react chemically with high-temperature melts. Oxide is a commonly used ceramic coating material. [0003] High-temperature furnace electrodes are generally made of high-melting point refractory materials, such as graphite electrodes for high-temperature electric arc furnaces for steelmaking. The Institute of Silicates of the Chi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/11H05B7/06
Inventor 程旭东
Owner WUHAN UNIV OF TECH
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