A Vacuum Cladding Surface Strengthening Method for Fracturing Pump Valve Body and Valve Seat

A vacuum cladding and surface strengthening technology, which is applied in the field of vacuum cladding surface strengthening of fracturing pump valve body and valve seat, can solve problems such as wear and corrosion, and achieve the effects of low cost, good heating uniformity and small internal stress

Active Publication Date: 2016-06-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the wear and corrosion problems encountered in the production and application of the fracturing pump valve body and valve seat, and provide a method for strengthening the surface of the fracturing pump valve body and valve seat by vacuum cladding, which adopts the method of vacuum cladding , using nickel-based self-fluxing alloy powder as raw material, adding different contents of WC hard strengthening phase powder, to prepare wear-resistant, corrosion-resistant and impact-resistant coatings on the surface of fracturing pump valve body and valve seat steel parts; the particle-reinforced alloy is used for In the surface coating technology, this kind of composite material has a good metallurgical bond with the substrate, which can be applied to a variety of metal substrates, so that the hardness, wear resistance, corrosion resistance and other properties of the coating are greatly improved, thereby effectively improving Service life of valve body and seat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Surface pretreatment of the workpiece: remove oil, impurities, scale, etc. on the surface of the 20CrMnTi steel piece before coating the powder coating.

[0016] (2) Preparation of powder raw materials, the composition of the ingredients by weight percentage is 10% of WC powder with a particle size of -325 mesh, and 90% of Ni-Cr-Mo-Fe-B-Si-C alloy powder with a particle size of -200 mesh.

[0017] (3) Prepare the mixed powder, weigh the powder according to the weight ratio of the powders described in step (2), and roll the ball mill for 3 hours to form the mixed powder and put it into a ziplock bag for use.

[0018] (4) Mix and stir the mixed powder and binder evenly to make a slurry, coat the surface of the workpiece with a thickness of 1 mm, put it in a vacuum drying oven and dry at 80° C. for 8 hours. After it dries, simple repairs can be made to make the coating more uniform and complete.

[0019] (5) Put the coated workpiece into the vacuum sintering furnace f...

Embodiment 2

[0021] (1) Workpiece surface pretreatment: remove oil, impurities, scale, etc. on the surface of 8620H steel parts before powder coating.

[0022] (2) Preparation of powder raw materials, the composition of the ingredients by weight percentage is WC powder 20%, particle size is -500 mesh, Ni-Cr-Mo-Fe-B-Si-C alloy powder 80%, particle size is -200 mesh.

[0023] (3) Prepare the mixed powder, weigh the powder according to the weight ratio of the powders described in step (2), and roll the ball mill for 3 hours to form the mixed powder and put it into a ziplock bag for use.

[0024] (4) Mix and stir the mixed powder and binder evenly to make a slurry, coat the surface of the workpiece with a thickness of 2mm, put it into a vacuum drying oven and dry at 80°C for 8 hours. After it dries, simple repairs can be made to make the coating more uniform and complete.

[0025] (5) Put the coated workpiece into the vacuum sintering furnace for cladding and sintering, and the vacuum degree ...

Embodiment 3

[0027] (1) Surface pretreatment of the workpiece: remove oil, impurities, scale, etc. on the surface of the 4145H alloy structural steel before coating the powder coating.

[0028] (2) Preparation of powder raw materials, the composition of the ingredients by weight percentage is WC powder 5%, particle size is -325 mesh, Ni-Cr-Mo-Fe-B-Si-C alloy powder 95%, particle size is -200 mesh.

[0029] (3) Prepare the mixed powder, weigh the powder according to the weight ratio of the powders described in step (2), and roll the ball mill for 3 hours to form the mixed powder and put it into a ziplock bag for use.

[0030] (4) Mix and stir the mixed powder and binder evenly to make a slurry, coat the surface of the workpiece with a thickness of 3mm, put it into a vacuum drying oven and dry at 80°C for 8 hours. After it dries, simple repairs can be made to make the coating more uniform and complete.

[0031] (5) Put the coated workpiece into the vacuum sintering furnace for cladding and ...

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Abstract

A vacuum cladding surface strengthening method for a fracturing pump valve body and a valve seat. Using the method of vacuum cladding, using nickel-based self-fluxing alloy powder as raw material, adding WC hard strengthening phase powder, a coating with high wear resistance, corrosion resistance and impact resistance is prepared on the surface of the valve body and valve seat of the fracturing pump. The process steps are: workpiece surface pretreatment—ball milling and mixing—making slurry—coating on workpiece surface—drying—vacuum sintering. The ingredients are composed of 5-30% of WC powder and 70-95% of Ni-Cr-Mo-Fe-B-Si-C alloy powder by weight percentage. The cladding coating prepared by the present invention has high density and small internal stress; a good metallurgical bond is formed between the coating and the substrate, which greatly improves the wear resistance, corrosion resistance and corrosion resistance of the cladding coating surface of the valve body and valve seat. Impact resistance, etc., thereby effectively improving the service life of the valve body and the valve seat; and the process of the invention is simple in operation, high in raw material utilization, low in cost, stable in process performance, and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to a vacuum cladding surface strengthening method for a valve body and a valve seat of a fracturing pump. technical background [0002] As a kind of oil field equipment, the fracturing pump is in a worse working condition than other common mechanical equipment during operation, and the working load it bears is increasing with the continuous increase of fracturing pressure, so it is necessary to improve Performance of key components and wearing parts of fracturing pumps. Among them, the characteristics of the valve body and valve seat of the fracturing pump are as follows: (1) High pressure causes the impact of the valve. It is easy to cause damage to the working surface, such as fatigue, fracture, sinking of the valve seat, etc.; (2) When sand is added to fracturing, the valve body, valve seat, and quartz sand / ceramic will form three-body abrasive wear, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/08C22C19/05C22C32/00
Inventor 郭志猛唐明忠宗朔通徐延龙许恩恩
Owner UNIV OF SCI & TECH BEIJING
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