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Preparation method of a composite material for erosion-resistant slurry pump flow parts surface

A surface composite material and slurry pump technology, applied in the field of metal surface strengthening, can solve the problems of material consumption, short life, reduced production efficiency and economic benefits, etc., and achieve the effects of increasing strength, improving surface hardness and wear resistance

Active Publication Date: 2018-03-30
山东鑫茂奥奈特复合固体润滑工程技术有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the erosion-resistant and wear-resistant materials used in the flow parts of domestic slurry pumps are mainly low-alloy cast iron, high-chromium cast iron, nickel-hard cast iron, and Aube ductile iron. Their service life is very short, resulting in a large consumption of materials. Increased maintenance funds and energy consumption, reduced production efficiency and economic benefits

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  • Preparation method of a composite material for erosion-resistant slurry pump flow parts surface

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preparation example Construction

[0011] A preparation method for the surface composite material of the erosion-resistant slurry pump flow part, the specific steps are as follows: add 2-3% of borax as a flux to the nickel-based alloy powder, and the mass percentage is 2-5% The phenolic resin is used as a binder, mixed evenly to form a pre-coating layer, and then bonded to the outer surface of the sand core of the mold cavity on the casting infiltration surface, the bonding thickness is 1.5-2mm, and dried at 150-200°C for 2-3 hours , fix the preheated sand core in the sealed sand box, pump negative pressure, the negative pressure value is 0.02-0.08MPa, pour gray cast iron, and control the casting temperature at 1300-1400°C, so that the gray cast iron used as the matrix metal liquid It is completely melted with nickel-based alloy powder particles to form a metallurgical combination. After the molten metal is completely solidified, the casting is taken out, and a surface composite material is formed on the inner s...

Embodiment 1

[0017] Such as figure 1 As shown, a method for preparing a composite material on the surface of an erosion-resistant slurry pump flow part is as follows:

[0018] 1) Add 3% borax to the nickel-based alloy powder as a flux, and the binder is 5% phenolic resin, mix evenly to form a pre-coating 2, and then bond it to the outer surface of the sand core of the impeller cavity on the cast infiltration surface, The bonding thickness is 1.5mm, and the chemical composition (mass percentage) of nickel-based alloy powder is 18% chromium, 8% molybdenum, 2.0% boron, 3.5% silicon, 0.7% carbon, iron ≤ 5%, and the balance is nickel. The particle size of the powder is 100-400 μm.

[0019] 2) Dry the pre-coat at 170°C for 2 hours, fix the preheated sand core 1 in the sealed sand box 5, and draw negative pressure from the negative pressure pipe 4 to make the negative pressure in the sealed sand box 5 is 0.04 MPa, pouring base metal liquid 3, casting temperature is 1380°C, so that the base meta...

Embodiment 2

[0021] This embodiment is a method for preparing a composite material on the surface of an erosion-resistant slurry pump flow part, the details are as follows:

[0022] 1) Add 2% borax as a flux to the nickel-based alloy powder, and 3% phenolic resin as the binder, mix evenly to form a pre-coat 3, and then bond it to the outer surface of the sand core 1 of the pump casing cavity on the casting surface Above, the bonding thickness is 2mm, and the chemical composition (mass percentage) of nickel-based alloy powder is 15% chromium, 5% molybdenum, 2.6% boron, 4.5% silicon, 0.5% carbon, iron ≤ 5%, and the balance is nickel. The particle size of the composite powder is 100-400 μm.

[0023] 2) Dry the pre-coat at 200°C for 3 hours, fix the preheated sand core 1 in the sealed sand box 5, and draw negative pressure from the negative pressure pipe 4 to make the negative pressure in the sealed sand box 5 The casting temperature is 0.07MPa, the molten metal of the base material is 3, and...

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Abstract

The invention relates to a metal surface strengthening technology, in particular to a preparation method for an erosion-resistant slurry pump overflowing piece surface composite material. The preparation method for the erosion-resistant slurry pump overflowing piece surface composite material is characterized in that the method takes gray pig iron liquid as base material metal liquid and nickel base alloy powder as a penetrating agent; a negative pressure cast-penetrating process is adopted to fully fuse the base material metal liquid and nickel base alloy powder particles into the metallurgical bonding formed surface composite material. According to the preparation method for the erosion-resistant slurry pump overflowing piece surface composite material, in the actual working condition when the erosion-resistant slurry pump overflowing piece surface composite material is used, a composite layer can not be peeled off and crazed, and the erosive wear is born under the lining of the gray pig iron with good tenacity.

Description

technical field [0001] The invention relates to a metal surface strengthening technology, in particular to a method for preparing a surface composite material of an erosion-resistant slurry pump flow part. Background technique [0002] Slurry pumps are widely used in hydraulic, electric power, coal, metallurgy, transportation and other industries. In the hydraulic transportation of solid materials, it is subjected to the erosion and wear of materials, and also bears the corrosion of slurry, and its operating conditions are harsh. So far, the erosion-resistant and wear-resistant materials used in the flow parts of domestic slurry pumps are mainly low-alloy cast iron, high-chromium cast iron, nickel-hard cast iron, and Aube ductile iron. Increased maintenance funds and energy consumption, reduced production efficiency and economic benefits. Contents of the invention [0003] The purpose of the present invention is to: aim at the deficiencies of the above materials, provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/08
CPCB22D19/14C22C19/056
Inventor 张军
Owner 山东鑫茂奥奈特复合固体润滑工程技术有限公司
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