Manufacturing method for mechanical sealing ring with cold friction characteristic and provided with diamond coating layer

A technology of diamond coating and friction characteristics, applied in metal material coating process, coating, gaseous chemical plating, etc., can solve the problems affecting the service life of sealing performance, high end face temperature, sealing leakage, etc., and improve the working life. , Good flatness, ensure the effect of uniformity

Active Publication Date: 2018-12-18
四川旗丰新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing diamond-coated mechanical seal rings all start from the aspect of wear resistance to improve the working life of the seal ring, and have not solved the problem of high end surface temperature, resulting in seal leakage or even failure, which directly affects the sealing performance and its use. life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The manufacturing method of diamond-coated mechanical seal ring with cold friction characteristics is:

[0039] A. Surface grinding: use 10mm thick hard alloy sealing ring with 7% cobalt content, outer dimension Φ66mm×10mm, ring sealing surface, inner diameter Φ51mm, outer diameter Φ62mm, quantity 4 pieces.

[0040] Use 1μm diamond powder, place it on cotton cloth, pressurize and grind the sealing surface of the substrate, where the pressure is twice the weight of the substrate, the grinding speed is 50r / min, grind the cloth crystal, and the grinding time is 60min, until the surface appears light yellow .

[0041] B. Surface chemical treatment: first conduct hydrogen plasma treatment, and heat for 80 minutes at 0.5kPa and 1100°C in a hydrogen atmosphere containing a carbon source gas with a concentration of 0.1% by volume. Then, add dilute nitric acid with a concentration of 15% for soaking, the solution temperature is 50°C, and the treatment time is 15 minutes. Then ...

Embodiment 2

[0054] The manufacturing method of diamond-coated mechanical seal ring with cold friction characteristics is:

[0055] A. Surface grinding: Carbide sealing ring with a thickness of 10mm and a cobalt content of 5% is used. The outer dimension is Φ66mm×10mm, the sealing surface is ring-shaped, the inner diameter is Φ51mm, the outer diameter is Φ62mm, and the quantity is 4 pieces.

[0056] Use 1 μm diamond micropowder, place it on cotton cloth, and pressurize and grind the substrate. The pressure is 4 times the weight of the substrate, and the grinding speed is 30r / min. Grinding cloth crystals, the grinding time is 50min, until the surface appears light yellow.

[0057] B. Surface chemical treatment: first carry out hydrogen plasma treatment, and heat for 40 minutes at 0.7kPa and 900°C in a hydrogen atmosphere containing a carbon source gas with a concentration of 0.5% by volume. Then, add dilute nitric acid with a concentration of 25% for soaking, the solution temperature is 50°...

Embodiment 3

[0070] The manufacturing method of diamond-coated mechanical seal ring with cold friction characteristics is:

[0071] A. Surface grinding: This embodiment is aimed at a silicon carbide sealing ring with a thickness of 10mm, with an outer dimension of Φ70mm×10mm, a ring-shaped sealing surface, an inner diameter of Φ52mm, an outer diameter of Φ70mm, and a quantity of 4 pieces.

[0072] Use 1 μm diamond powder, place it on cotton cloth, and grind the substrate under pressure. The pressure is 5 times of the weight of the substrate, and the grinding speed is 30r / min. Grinding cloth crystals, the grinding time is 30min, until the surface appears light yellow.

[0073] B. Surface chemical treatment: first conduct hydrogen plasma treatment, and heat for 30 minutes at 0.7kPa and 1000°C in a hydrogen atmosphere containing a carbon source gas with a concentration of 1% by volume. Then, add dilute hydrochloric acid with a concentration of 10% for soaking, the solution temperature is 40° ...

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Abstract

The invention discloses a manufacturing method for a mechanical sealing ring with cold friction characteristic and provided with a diamond coating layer. The manufacturing method comprises the following steps: A. taking a low-cobalt hard alloy sealing ring or a silicon carbide sealing ring as a matrix, grinding a sealing surface of the matrix, and carrying out uniform crystal distribution; B. carrying out acid treatment and hydrogen plasma treatment on the sealing surface of the matrix; the acid treatment is soaking the sealing surface of the matrix with dilute acid; and the hydrogen plasma treatment is heating for 20min-80min under a micro-positive pressure and at 900-1100 DEG C, in a hydrogen atmosphere containing a carbon source gas with a concentration of 0.1%-1%; C. heating the matrixthrough a spatial hot wire array, uniformly charging a reaction gas from a plurality of points, and applying a direct-current negative bias voltage between the spatial hot wire array and the matrix,and depositing, wherein a heating temperature is 800-950 DEG C; a bias current is 1A-5A; a gas pressure is 1.0-4.0kPa; and a deposition time is 2-7h; and D. polishing the deposited matrix to obtain the uniform and compact mechanical sealing ring provided with the diamond coating layer and having a thickness of 5-10[mu]m. The method is capable of greatly lowering an end surface temperature from thenature of materials, and prolonging the working life of the sealing ring.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a method for preparing a sealing ring, in particular to a method for manufacturing a diamond-coated mechanical sealing ring with cold friction characteristics. Background technique [0002] In the field of mechanical seals, the change of the end surface temperature of the mechanical seal will have a direct impact on the performance of the mechanical seal, resulting in seal leakage or even failure. Since the temperature change of the sealing ring is relatively complicated, in actual operation, the purpose of cooling is mainly achieved by strengthening lubrication and cooling. In the prior art, for the outer step seal ring, flat ring seal ring, inner step seal ring and dynamic pressure groove seal ring, a ring groove is opened on the seal ring, and an axial through hole is opened on the non-sealing side, and the through hole It is connected with the ring groove, and the fluid mediu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/27C23C16/02
CPCC23C16/02C23C16/0254C23C16/271
Inventor 何晓青刘东
Owner 四川旗丰新材科技有限公司
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