High-hardness nickel-based titanium carbide powder and preparation method thereof

A high-hardness, titanium carbide technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of poor corrosion resistance, increased carbon content, decreased toughness, etc., to achieve hardness and corrosion resistance Improve and reduce spraying cost and slow down the effect of C loss

Active Publication Date: 2020-10-23
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Titanium iron carbide-based spraying materials are still under research due to their poor corrosion resistance; titanium carbide nickel-based spraying materials have good corrosion resistance, but the coating hardness after thermal spraying is low
Taking TiC-NiCr as an example, in the thermal spraying process, the flame flow temperature is above 2200°C, and the powder particles will be heated to above 1600°C. TiC is easy to dissolve in nickel, and more TiC is solid-dissolved in the nickel-based matrix. As the quality phase decreases, the hardness of the coating decreases, the carbon content in the binder phase increases, and the toughness will also decrease. The coating performance is difficult to meet the application requirements. The coating hardness of supersonic flame sprayed TiC-25NiCr is below HV 0.3 Between 820-980, lower than the use requirements of general tungsten carbide coatings

Method used

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  • High-hardness nickel-based titanium carbide powder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Raw material preparation: TiC powder accounts for 75% of the total weight of the composite powder; NiCrSi accounts for 25% of the total weight of the composite powder, wherein: Cr accounts for 23% of the weight of NiCrSi, Si accounts for 1.5% of the weight of NiCrSi, and Ni is the balance, The NiCrSi powder is prepared by a gas atomization method.

[0022] 2) Mix the above two powders uniformly in proportion, add deionized water to make a wet grinding medium, add polyvinyl alcohol accounting for 4% of the total weight of raw materials as a binder, and ball mill for 72 hours to prepare a mixed slurry;

[0023] 3) Spray-dry the above-mentioned mixed slurry to obtain agglomerated particles; wherein, the inlet temperature of the centrifugal spray drying equipment is 240°C, the outlet temperature is 120°C, the rotation speed of the atomizing disc is 12000r / min, and the feeding volume is 300ml / min ;

[0024] 4) Sinter the agglomerated particles obtained after the above sp...

Embodiment 2

[0027] 1) Raw material preparation: TiC powder accounts for 50% of the total weight of the composite powder; NiCrSi accounts for 50% of the total weight of the composite powder, wherein: Cr accounts for 20% of the weight of NiCrSi, Si accounts for 1% of the weight of NiCrSi, and Mo accounts for 10% of the weight of NiCrSi %, Ni is the balance, and NiCrSi is prepared by gas atomization or vacuum atomization.

[0028] 2) Mix the two powders evenly, add deionized water to make a wet grinding medium, add polyethylene glycol accounting for 6% of the total weight of raw materials as a binder, and ball mill for 72 hours to prepare a mixed slurry;

[0029] 3) Spray-dry the above-mentioned mixed slurry to obtain agglomerated particles; wherein, the inlet temperature of the centrifugal spray drying equipment is 220°C, the outlet temperature is 120°C, the rotation speed of the atomizing disc is 15000r / min, and the feeding volume is 300ml / min ;

[0030] 4) Sinter the agglomerated particl...

Embodiment 3

[0033] 1) Weigh 60kg of TiC powder, 8kg of Cr powder, 0.5kg of Si powder, and 31.5kg of Ni powder.

[0034] 2) Mix the above powders evenly, add deionized water to make a wet grinding medium, add polyethylene glycol accounting for 5% of the total weight of raw materials as a binder, and ball mill for 48 hours to prepare a mixed slurry;

[0035] 3) Spray-dry the above-mentioned mixed slurry to obtain agglomerated particles; wherein, the inlet temperature of the centrifugal spray drying equipment is 220°C, the outlet temperature is 120°C, the rotation speed of the atomizing disc is 15000r / min, and the feeding volume is 300ml / min ;

[0036] 4) Sinter the agglomerated particles obtained after the above spray drying to obtain a powder, heat the powder in a vacuum degumming furnace at a sintering temperature of 1305°C, keep it for 3 hours, and then cool it to below 150°C with the furnace to release it;

[0037] 5) After sieving and classifying the above-mentioned discharged powder,...

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Abstract

The invention provides high-hardness nickel-based titanium carbide powder and a preparation method thereof, and belongs to the technical field of surface engineering. Aiming at solving the problem oflow hardness of a TiC-NiCr coating, a TiC-NiCrSi sprayed material is designed, and the hardness of a titanium carbide metal-ceramic coating can be effectively improved. The high-hardness nickel-basedtitanium carbide powder is prepared from the components by mass: 50-75% of TiC and 25-50% of NiCrSi, wherein in the NiCrSi, Cr accounts for 20-23%, Si accounts for 1-2.2%, and Ni accounts for the balance; and 5-20% of Mo can also be added on the basis of the NiCrSi to improve the corrosion resistance and hardness of the coating. A WC coating is replaced with a TiC coating advantageously, and the spraying cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and relates to a high-hardness nickel-based titanium carbide powder and a preparation method thereof, which can be used for surface wear protection in industries such as machinery, petroleum, chemical industry, shipbuilding, metallurgy, and electric power. Background technique [0002] With the improvement of environmental protection requirements and performance requirements of industrial parts, the traditional hard chrome coating can no longer meet the needs of industrial applications. Many surface technologies have been studied to replace electrochrome plating technologies, such as thermal spraying, laser cladding, PVD, etc. Among many surface treatment processes, supersonic flame spraying has the characteristics of no pollution, high processing efficiency, simple process, excellent coating performance, and on-site construction. It is considered to be the most likely technology to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129B22F9/02C22C29/06
CPCC23C4/06C23C4/129C22C29/067B22F9/026
Inventor 高峰李杰王立新吴超张康
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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