Laminar flow arc plasma jet material surface processing method

A kind of arc plasma, plasma technology, applied in the direction of plasma, metal material coating process, coating, etc., can solve problems such as blank

Inactive Publication Date: 2004-06-02
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this material surface treatm

Method used

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  • Laminar flow arc plasma jet material surface processing method
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  • Laminar flow arc plasma jet material surface processing method

Examples

Experimental program
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Embodiment 1

[0033] Example 1: Fusion surface strengthening treatment

[0034] The Mo-W-Cu cast iron used for high-power diesel engine cylinder liners is subjected to single-scan fusion surface strengthening treatment by the treatment method of the present invention, and the relevant process parameters are: the air flow rate of the laminar plasma jet is 5 liters / min, The input power is 8kW, the distance between the workpiece and the generator outlet is 20mm, and the translation speed of the workpiece is 0.05m / min.

[0035] The results show that the laminar plasma jet heats the surface of the cast iron uniformly and is easy to operate and control. Even if the distance between the workpiece surface and the generator changes by 4 mm, the molten marks on the surface of the cast iron can be kept basically uniform, and the liquid in the molten pool can be maintained. There is no sign of being blown away from the molten pool by the jet. After the melting treatment, the graphite flakes in the molt...

Embodiment 2

[0036] Example 2: Powder injection type welding surface treatment

[0037] In this example, ZrO with a particle size of 40-100 μm is applied to the surface of 1Cr18Ni19Ti stainless steel. 2 Zirconia powder and 40% ZrO 2 - 60% Ni nickel-coated zirconia powder powder-injection deposition surface treatment. The relevant process parameters are: the laminar plasma jet working gas flow rate is 6 liters / min, the input power is 9kW, the distance between the workpiece and the generator outlet is 15mm, the workpiece moving speed is 0.1m / mim, and the powder supply gas flow rate is 0.3 liters / Minute.

[0038] The results show that a single treatment can form a cladding zone with a thickness of about 1mm and a width of about 4mm on the stainless steel surface. Microscopic observation shows that there is a good metallurgical bonding interface between the deposited layer and the workpiece substrate, and no micro-defects such as micro-cracks and micro-holes are generated. The microhardne...

Embodiment 3

[0039] Example 3: Preset powder type welding surface treatment

[0040] The pre-set powder type welding surface treatment method of the present invention is adopted. The selected base material, powder material and process parameters are completely the same as those in Example 2, the preset powder thickness is 0.1 mm, and the preset method is powder slurry painting.

[0041] The results show that the pre-cladding method can also form a cladding zone with a thickness of about 1 mm and a width of about 4 mm on the surface of stainless steel, and the same effect as that of the powder-injected cladding can be obtained. The difference is that this method does not involve a powder feeding process. In this way, for some fine powders with poor fluidity, such as ZrO with particle size less than 20 μm 2 Zirconia powder and 40% ZrO 2 -60% Ni nickel-coated zirconia powder, which can also be used for material surface strengthening treatment.

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Abstract

The invention relates to a process for treating the surface of laminar current electrical arc plasm jet flow material, wherein the DC non-transforming type laminar current electrical arc plasma jet flow generator is used as heat source, The generator is connected to the work piece wirelessly, bby changing the laminar flow plasma jet energy, the distance between the generator exit and the work piece, the spacing included angle and relative movement speed between the generator and the work piece, the work piece surface of various types of conducting materials can be treated. The method by the invention has good stability and repeatability.

Description

technical field [0001] The invention belongs to a material surface treatment (also known as modification) process, and relates to a material surface treatment process of a laminar arc plasma jet, including phase transition or fusion strengthening, surface cladding of heterogeneous material coatings and gradient surface coatings. Background technique [0002] The surface properties of component materials are often an important factor in determining their performance and life. Among various treatment and modification methods for improving wear resistance, fatigue resistance, heat insulation and other special properties of metal surfaces, the energy flux density range of atmospheric pressure DC arc plasma jet is -10 5 W / cm 2 , the heating and cooling speed can reach 10 in the rapid cooling and rapid heat treatment of the local surface of the material 4 K / s, the influence area is φ2-φ10mm, which can realize surface strengthening treatment. At the same time, compared with lase...

Claims

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Application Information

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IPC IPC(8): C21D1/08C23C4/131C23C4/134H05H1/32H05H1/48
Inventor 吴承康潘文霞马维
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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