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Wear-resistant coating on valve plate of EB furnace equipment gate valve, and spraying technology thereof

A wear-resistant coating, plug-in valve technology, applied in the direction of metal material coating process, coating, fusion spraying, etc. Plate surface and other problems, to achieve the effect of good coating processing performance, low cost, improved hardness and wear resistance

Inactive Publication Date: 2017-05-10
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of valve sealing surface hardening technology, the invention patent of application number 2013044348.3 "A Spraying Process of Anti-corrosion Coating on the Surface of Sealing Surface" used supersonic flame spraying to prepare a layer of 600-900μm wear-resistant coating, the coating bonding strength It is 39~43MPa, but the hardness and post-processing of the coating have not been assessed, and the thickness of the coating is too large, which is not suitable for the surface of the valve plate.

Method used

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  • Wear-resistant coating on valve plate of EB furnace equipment gate valve, and spraying technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The thickness of the valve plate is processed from 10mm to 9.6mm by surface grinding, and the coating composition is Cr 3 C 2 75%, Cr 5%, Ni 20%. The HVAF spraying process is: propane pressure 0.53~0.60MPa, air pressure 0.62~0.68MPa, carrier gas flow rate 30L / min, hydrogen pressure 0.88MPa, hydrogen flow rate 45L / min, powder feeding speed 35g / min, spraying distance 200mm, spraying angle 90°, spraying speed 700mm / s, step distance 3mm. When spraying, the combustion chamber pressure is 0.41MPa, and the substrate temperature is 110-150°C. The bonding strength of the prepared coating is >60MPa, the microhardness is 937HV0.1, the porosity is 0.98%, the surface roughness of the coating after grinding is 0.396μm, and the flatness of the valve plate is 0.07mm.

Embodiment 2

[0034] The thickness of the valve plate is processed from 10mm to 9.7mm by surface grinding, and the coating composition is Cr 3 C 2 80%, Cr 4%, Ni 16%. The HVAF spraying process is: propane pressure 0.51~0.55MPa, air pressure 0.62~0.64MPa, carrier gas flow rate 30L / min, hydrogen pressure 0.82MPa, hydrogen flow rate 50L / min, powder feeding speed 30g / min, spraying distance 180mm, spraying angle 90°, spraying speed 700mm / s, step distance 3mm. When spraying, the combustion chamber pressure is 0.40MPa, and the substrate temperature is 110-140°C. The bonding strength of the prepared coating is >60MPa, the microhardness is 986HV0.1, the porosity is 1.28%, the surface roughness of the coating after grinding is 0.388μm, and the flatness of the valve plate is 0.08mm.

Embodiment 3

[0036] The thickness of the valve plate is processed from 10mm to 9.6mm by surface grinding, and the coating composition is Cr 3 C 250%, Cr 10%, Ni 40%. The HVAF spraying process is: propane pressure 0.50~0.55MPa, air pressure 0.58~0.65MPa, carrier gas flow rate 35L / min, hydrogen pressure 0.85MPa, hydrogen flow rate 50L / min, powder feeding speed 40g / min, spraying distance 200mm, spraying angle 90°, spraying speed 1000mm / s, step distance 3mm. When spraying, the combustion chamber pressure is 0.38MPa, and the substrate temperature is 100-150°C. The bonding strength of the prepared coating is >60MPa, the microhardness is 759HV0.1, the porosity is 0.82%, the surface roughness of the coating after grinding is 0.400μm, and the flatness of the valve plate is 0.07mm.

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Abstract

The invention provides a wear-resistant coating on a valve plate of an EB furnace equipment gate valve, and a spraying technology thereof. The wear-resistant coating comprises components in percentage by mass as follows: 50-80% of Cr3C2, 4-10% of Cr and 16-40% of Ni. The spraying technology comprises: firstly, thinning the valve plate by 0.3-0.5mm, and after cleaning, adopting brown aluminium oxide sand grains to carry out sand blasting and coarsening on a surface; compressed air used for sand blasting is dry and oil-free, the air pressure is about 0.6-0.8MPa, the spraying angle is 90+ / -10 degrees, the sand blasting distance is 0.15-0.2m, and sand blasting is completed until the surface of the valve plate is even and does not reflect light; the high-performance wear-resistant coating is prepared on the surface of the valve plate by adopting an HVOF (high velocity oxy-fuel) technology, the thickness is 0.25-0.40 mm, fuel gas used for spraying is propane, combustion-supporting gas is compressed air, argon gas or nitrogen gas is used as carrier gas at the same time, and auxiliary gas is hydrogen gas. The wear-resistant coating can effectively improve the surface hardness and wear resistance of the valve plate, prolong the service life, and improve the resistance, of the valve plate surface, to erosive wear caused by titanium sponge and other medium particles.

Description

technical field [0001] The invention relates to a spraying process, in particular to a wear-resistant coating for an EB furnace equipment plug-in valve valve plate and a spraying process thereof. Background technique [0002] Electron beam cooling bed melting furnace (EB furnace) is an irreplaceable advanced melting equipment for high-quality titanium and titanium alloy ingots. Its vacuum gate valve plays the role of vacuum sealing isolation and feeding channel in the sponge titanium drum feeder. , the valve plate is one of the key components. The valve plate has been impacted by sponge titanium for a long time during use, as well as worn and scratched by titanium dioxide dust and titanium dust. The wear and thinning and scratches on the surface of the valve plate make the rubber sealing ring inside the valve body wear quickly, resulting in vacuum leakage of the equipment, which in turn affects the normal operation of the overall equipment. Therefore, surface hardening tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/02C22C29/06
CPCC23C4/06C22C29/067C23C4/02
Inventor 武笑宇许康威朱俊杰
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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