Plasma in situ reaction composite treating process of tube inner wall

An in-situ reaction and composite treatment technology, applied in the coating process and coating of metal materials, can solve the problems of cracks in temperature changes, difficult processing, low production efficiency, etc., to reduce input energy, no environmental pollution, work Efficient effect

Inactive Publication Date: 2005-01-26
崔洪芝 +1
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AI Technical Summary

Problems solved by technology

At present, when processing the inner surface of the slender pipe, the original technologies that have a significant effect on the outer surface strengthening treatment, such as laser cladding, plasma surface alloying, etc., are difficult to implement in the inner hole and poor heat dissipation conditions. After treatment, the pipeline deforms greatly, making it difficult to play its role
In addition, some technologies with remarkable effects, such as carburizing, nitriding, electroplating, chemical plating, laser quenching, etc., can indeed improve the hardness and wear resistance of the inner wall of the pipeline, and improve the life of the pipeline. The disadvantages are: Large-scale equipment investment, low production efficiency, and high processing costs limit the large-scale industrial application of these technologies
Furthermore, the centrifugal-self-propagating method closer to the present invention can form a ceramic coating technology on the inner wall of the pipeline. Because the thermal expansion coefficient difference between the coating and the substrate is too large, cracks often appear when the temperature changes, so it cannot meet the anti-corrosion and wear-resistant requirements. In addition, the thickness of the coating is also difficult to control, and subsequent processing is difficult, so it is not suitable for pipeline treatment with matching accuracy requirements on the inner surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1-FeAl+TiB is formed on the inner wall of the whole cylinder pump tube 2 +Al 2 o 3 Intermetallic / Ceramic Coatings

[0045] The whole pump tube of oil pumping unit (commonly known as kowtow) is located at the bottom of the oil well. During operation, the inner surface is worn by impurity particles and corroded by oil and gas during the reciprocating movement of the plunger. Under the combined action of wear and corrosion, the service life is very long. Low. The surface is treated by plasma-assisted in-situ reaction technology, the specific process is as follows: preparation of Fe-Al-TiO 2 -B 2 o 3 - Co-based, Fe, Al, TiO 2 , Co particle size are 150-200 mesh, B 2 o 3 The particle size is 100-150 mesh, according to the ratio of Fe:Al=4:1, prepare Fe, Al powder, this part is called ①; Al, TiO 2 , B 2 o 3 The three according to the reaction formula Preparation, this part is called ②; then weigh according to the mass ratio of ①15% and ②80%, and ad...

Embodiment 2

[0046] Example 2 - Formation of NiAl and FeAl intermetallic compound coatings on the inner wall of the oil pipe

[0047] Oil pipes used on oil wells are mainly corroded by oil and gas during work, and require good corrosion resistance. The inner surface is treated by plasma-assisted in-situ reaction technology, and the specific steps are as follows: prepare Ni-Al-Co and Fe-Al-Co systems, and the mass percentages are: 80% for Ni or Fe powder, and 15% for Al powder , and the rest is Co powder. After the preparation, the above powder is dried for 8 hours, and then poured into a ball mill and mixed for 10 hours. Put the oil pipe on the workbench, clamp one end with a three-jaw chuck, send it into the plasma generator, turn on the cooling water, air supply, powder supply and power switch, start the arc at high frequency, and enter the plasma in-situ reaction stage. The process parameters are: : Ar gas flow 0.8m 3 / h, powder flow rate 0.5m 3 / h, the plasma discharge voltage is 60V...

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PUM

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Abstract

A pipe inner wall plasma in-situ reaction composite processing technology is characterized in that: the processing technology comprises the following steps: (1) preparing thermal reaction powder; (2) preparing the workpieces for processing; (3) starting the workbench, opening the gas and cooling water switch of the plasma equipment, opening the power supply and starting arc by high frequency, adjusting the technological parameter range of the plasma beam, adjusting the rotation speed of the workpiece, and adjusting the feeding speed of the plasma generator; (4) closing the plasma power supply and the switches of the air bottle and powder feeder, and closing the cooling water switch; (5) arranging the processed workpieces in order for use later. The tapered composite coating with high strength can be obtained by the technology.

Description

technical field [0001] The invention relates to a surface treatment process, and more specifically, the invention relates to a plasma in-situ reaction composite treatment process for the inner wall of a pipeline. It belongs to the field of surface treatment. The present invention belongs to category C23 in the International Patent Classification. Background technique [0002] In petroleum, chemical industry, metallurgy, energy and other fields, there are a large number of pipelines under high temperature, corrosion, wear and other working conditions. The inner surface of these pipelines is strengthened to form a high temperature resistant, corrosion resistant and wear resistant reinforced coating , It is undoubtedly an effective way to improve the service life of the pipeline and save raw materials. At present, when processing the inner surface of the slender pipe, the original technologies that have a significant effect on the outer surface strengthening treatment, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 崔洪芝尹华跃
Owner 崔洪芝
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