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Preparation method for diamond coated mechanical seal ring

A technology of diamond coating and mechanical seal, applied in metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of short working life and achieve the effect of improving working life, shortening time and reducing wear rate

Inactive Publication Date: 2016-06-01
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects in the prior art, the present invention provides a method for preparing a diamond-coated mechanical seal ring, aiming at the shortcoming of a cemented carbide or silicon nitride / silicon carbide ceramic mechanical seal ring with short working life under severe working conditions, using The hot wire chemical vapor deposition method deposits a layer of diamond film on the working surface of the mechanical seal ring to reduce the wear rate of the working surface, improve the working life of the seal ring and reduce the number of shutdowns of the pump or the entire chemical equipment

Method used

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  • Preparation method for diamond coated mechanical seal ring
  • Preparation method for diamond coated mechanical seal ring
  • Preparation method for diamond coated mechanical seal ring

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The mechanical seal ring in this embodiment is directly applied to the performance test of the standard 100-hour seal ring. The base material of the seal ring is silicon carbide, and the external dimensions are The working surface is ring-shaped, with an inner diameter of 40mm and an outer diameter of 45mm.

[0034] The steps for preparing the diamond-coated silicon carbide mechanical seal ring are as follows: use 10 μm thick diamond grinding fluid to ultrasonically roughen the working surface, and then use 1 μm diamond micropowder to mechanically grind and distribute the crystal of the seal ring. The diamond film was deposited on the surface of 15 silicon carbide mechanical seal rings simultaneously by means of 10 hot wires arranged in parallel. The deposition time of the micro-diamond film was 8 hours, and the deposition time of the nano-diamond film was 2 hours. Finally, use a plane polishing machine to level the surface of the diamond film, and the time for levelin...

Embodiment 2

[0037] The diamond-coated mechanical seal ring of this embodiment is applied to a high-pressure pump, the conveying medium is viscous cement slurry, the base material of the seal ring is silicon nitride, and the external dimensions are The working surface is ring-shaped, with an inner diameter of 30mm and an outer diameter of 35mm.

[0038] The specific preparation method of the sealing ring is as follows: first, the working surface of the sealing ring is roughened ultrasonically with 12 μm diamond grinding liquid, and the treatment time is 10 minutes; then, the sealing ring is ground and crystal-distributed with 2 micron diamond powder; finally, pure water and Acetone was used to clean the workpiece. The diamond film was deposited on the surface of 12 sealing rings simultaneously by means of parallel hot wire arrangement, and the distance between the hot wire and the deposition surface was 10 mm. The total power of the hot wire in the micro-diamond film deposition stage is ...

Embodiment 3

[0041] The diamond-coated mechanical seal ring of this embodiment is applied in the delivery pump of the purified terephthalic acid plant. The device contains a large amount of toxic, harmful, flammable, explosive and highly corrosive chemical raw materials, so the requirements for the airtightness of the device are very high. The base body of the mechanical seal ring for this application is YG6 cemented carbide, and its dimensions are The working surface is ring-shaped, with an inner diameter of 34mm and an outer diameter of 40mm. The specific steps for depositing a diamond film on the working surface of a traditional hard alloy mechanical seal ring are as follows: first, immerse the seal ring in Murakami solution for ultrasonic treatment for 30 minutes, then wash and dry the hard alloy substrate with Caro solution for 1 minute to remove the cobalt on the surface of the substrate Elements, followed by mechanical grinding and polishing with 8 μm diamond abrasive liquid and a...

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Abstract

The invention discloses a preparation method for a diamond coated mechanical seal ring. A hard-alloy silicon-carbide / silicon nitride ceramic mechanical seal ring serves as a substrate, and a diamond thin film is deposited on a work surface of the mechanical seal ring through a hot filament chemical vapor deposition (HFCVD) method. The specific process method comprises the steps that firstly, a layer of micron-diamond thin film which is coarse in grain, excellent in abrasion resistance but difficult to polish is deposited on the surface of the substrate; and then thinned nano-diamond particles are deposited between micron-diamond particles by changing process parameters so that sunken parts between the coarse micron-diamond particles can be filled, and the purposes that the surface roughness of a diamond coating is lowered and accordingly subsequent grinding and polishing are convenient. According to the diamond coated mechanical seal ring obtained through the two-step deposition method in the preparation method, abrasion rate of a contact end face can be lowered significantly, and the working life of the diamond coated mechanical seal ring is prolonged significantly compared with a non-coated mechanical seal ring.

Description

technical field [0001] The invention belongs to the technical field of thin films, and in particular relates to a preparation method of a diamond-coated mechanical seal ring. Background technique [0002] Mechanical face seal is a widely used rotating shaft dynamic seal, referred to as mechanical seal, also known as end face seal. In the past ten years, mechanical seal technology has made great progress and has been widely used in industries such as petroleum, chemical industry, light industry, metallurgy, machinery, aviation and atomic energy. According to the statistics of my country's contemporary petrochemical industry, 80% to 90% of centrifugal pumps use mechanical seals. In industrially developed countries, in the sealing device of rotating machinery, the amount of mechanical seal accounts for more than 90% of the total seal usage. Especially in recent years, the mechanical seal has developed rapidly and has become an extremely important dynamic seal form in fluid se...

Claims

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Application Information

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IPC IPC(8): C23C16/27C23C16/02C23C16/46
CPCC23C16/0254C23C16/271C23C16/46
Inventor 雷学林孙方宏郭松寿张文骅郭睿
Owner SHANGHAI JIAO TONG UNIV
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