Method of plasma spraying preparation of ternary boride-based metal ceramic coating

A ternary boride, ceramic coating technology, applied in metal material coating process, coating, manufacturing tools, etc., can solve the problems of products that are difficult to meet impact load, and achieve the effect of improving service life

Inactive Publication Date: 2009-07-08
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding strength between the coating and the substrate can only reach 60-70 MPa, which is difficult to meet the requirements of impact load products

Method used

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  • Method of plasma spraying preparation of ternary boride-based metal ceramic coating
  • Method of plasma spraying preparation of ternary boride-based metal ceramic coating
  • Method of plasma spraying preparation of ternary boride-based metal ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Base material: 45 steel.

[0033] Powder composition mass percent: 35% FeB, 40% Mo, 2% Ni, 3% Cr, 20% Fe, ball milled for 8 hours, powder particle size 5 μm.

[0034] Plasma spraying process parameters: the spraying distance is 80mm, the spraying angle is 80°~90°, the moving speed of the spray gun is 15cm / s, and the thickness of each spraying is less than 0.10mm. Ar pressure 0.8MPa, flow rate 1500L / h, H 2 The pressure is 0.1MPa, the flow rate is 300L / h, and the powder feeding pressure is 0.05MPa. The current is 500A, the voltage is 50V, the powder is fed in the gun, and the powder feeding speed is 11m / s. Coating thickness 1 coffee.

[0035] Heat treatment process: 850 ° C, heat preservation for 1 hour, and air cooling after taking out the furnace.

Embodiment 2

[0037] Base material: H13 steel.

[0038] Powder composition mass percent: 25% FeB, 50% Mo, 3% Ni, 4% Cr, 18% Fe, ball milled for 8 hours, powder particle size 5 μm.

[0039] Plasma spraying process parameters: the spraying distance is 80mm, the spraying angle is 80°~90°, the moving speed of the spray gun is 15cm / s, and the thickness of each spraying is less than 0.10mm. Ar pressure 0.8MPa, flow rate 1500L / h, H 2 The pressure is 0.1MPa, the flow rate is 300L / h, and the powder feeding pressure is 0.05MPa. The current is 500A, the voltage is 50V, the powder is fed in the gun, and the powder feeding speed is 11m / s. Coating thickness 1mm.

[0040] Heat treatment process: 1050°C, heat preservation for 1 hour, oil quenching, 540°C, heat preservation for 1 hour, furnace cooling.

Embodiment 3

[0042] Base material: W18Cr4V steel.

[0043] Powder composition mass percent: 40% FeB, 35% Mo, 5% Ni, 5% Cr, 15% Fe, ball milled for 8 hours, powder particle size 5 μm.

[0044] Plasma spraying process parameters: the spraying distance is 80mm, the spraying angle is 80°~90°, the moving speed of the spray gun is 15cm / s, and the thickness of each spraying is less than 0.10mm. Ar pressure 0.8MPa, flow rate 1500L / h, H 2 The pressure is 0.1MPa, the flow rate is 300L / h, and the powder feeding pressure is 0.05MPa. The current is 500A, the voltage is 50V, the powder is fed in the gun, and the powder feeding speed is 11m / s. Coating thickness 1mm.

[0045] Heat treatment process: 1100°C, heat preservation for 1 hour, oil quenching, 560°C, heat preservation for 1 hour, furnace cooling.

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Abstract

The invention discloses a making method of ternary boride base ceramic coating sprayed by plasmid, which is characterized by the following: reacting at original position on the surface of steel material to obtain Mo2FeB2 coating; normalizing (quenching and tempering); generating chemical reaction between coating and steel material to form reacting boundary; allocating plasmid spraying powder through 25%-40%FeB, 35%-50% Mo, 1%-10% Ni, 1%-10% Cr and 10%- 20% Fe with grain size at 5-20um; improving heat fatigue lifetime by 2 times corresponding to H13 steel (47HRC).

Description

technical field [0001] The present invention relates to a kind of plasma spraying preparation ternary boride (Mo 2 FeB 2 )-based cermet coating production process, the coating obtained on the surface of iron and steel materials has high bonding strength and hardness, can greatly improve the wear resistance and thermal fatigue resistance of the material, and can be widely used in Surface treatment and remanufacturing of structural steel, tool steel, and mold steel products to improve the service life of the products. Background technique [0002] Mo 2 FeB 2 The ternary boride-based cermet is a kind of ternary boride that uses Ni, Cr, Mo, Fe and other powders to react with boron or boride mixed powder in situ at high temperature to form ternary boride, and achieves complete densification through high-temperature liquid phase sintering. A new type of process. The structure of the sintered body is composed of a hard phase of ternary boride and an iron-based binder phase con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C4/10C21D1/28C21D1/18C21D11/00C23C4/06C23C4/134
Inventor 周小平胡心彬李四年
Owner HUBEI UNIV OF TECH
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