Silver thin film composited carbon sealing ring and preparation method thereof

A sealing ring and silver thin film technology, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of sealing ring sealing effect, cold resistance, heat resistance, etc., and achieve simple structure, reasonable design and excellent performance Effect

Inactive Publication Date: 2014-04-02

HARBIN UNIV OF SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

However, the sealing effect, cold resistance and heat resistance of the existi...

Abstract

The invention relates to a silver thin film composited carbon sealing ring and a preparation method thereof, and solves problems of sealing material lubrication, high temperature oxidation and thermal expansion in oil heat extraction sealing technology and problems in composite technology of more sealing materials. A conventional sealing material composite technology and a sealing ring prepared by the conventional technology have the disadvantages that the sealing effect, the cold resisting effect and the heat resisting effect are bad. The method provided by the invention comprises the following steps: a silver film (2) is composited on the surface of a carbon ring (1), the inner diameter of the carbon ring is 10 cm, and the outer diameter of the carbon ring is 12 cm. The invention relates to the sealing ring and the preparation thereof.

Application Domain

Engine seals

Technology Topic

LubricationPetroleum +3

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Examples

Experimental program(3)
Effect test(1)

Example Embodiment

[0016] Example 1:

[0017] A carbon sealing ring of composite silver film, the composition includes: carbon ring 1, the surface of the carbon ring is composite silver film 2, the inner diameter of the carbon ring is ф10cm, and the outer diameter of the carbon ring is ф12cm.

Example Embodiment

[0018] Example 2:

[0019] A method for preparing a carbon sealing ring of a composite silver film. In the first step, graphite powder is added to the mold of the forming machine and pressurized to form a carbon ring with an inner diameter of ф10cm and an outer diameter of ф12cmm;

[0020] The second step is to perform surface polishing and other treatments on the carbon ring, and then put it into the mold of the high-pressure vacuum impregnation furnace;

[0021] The third step is to put the solid silver in a crucible in a high-pressure vacuum impregnation furnace, heat it to melt, and simultaneously evacuate the high-pressure vacuum impregnation furnace and preheat the carbon ring;

[0022] In the fourth step, when the temperature in the high-pressure vacuum impregnation furnace is 1000-1100°C and the pressure is 20-25Mpa, align the crucible liquid outlet at the inlet of the mold pipeline equipped with carbon rings to make the molten silver liquid Enter the mold through the pipeline, the carbon ring is immersed in the molten silver liquid in the mold, and the silver liquid is squeezed into the pores of the carbon ring under the action of external pressure, and finally forms Carbon sealing ring with composite silver film.

Example Embodiment

[0023] Example 3:

[0024] According to the method for preparing the carbon sealing ring of the composite silver film described in Example 2, the purity of the graphite powder is above 99%.

[0025] The determination of the preparation process of the carbon sealing ring of the composite silver film:

[0026] In the preparation process of the carbon sealing ring of the composite silver film, the difference in process parameters directly affects the performance of the carbon sealing ring of the composite silver film, especially the formation of the interface. The interface formed by the carbon sealing ring of the composite silver film is mainly wetted, and a small part of the reactive interface exists. When only considering the impregnation effect of graphite materials, the main influencing factors are:

[0027] 1) Metallic silver melt temperature: the higher the temperature, the better the fluidity, and the easier it is to fill the deep layer of the carbon ring, but due to the limitation of the silver melting temperature, the heating temperature cannot be set to a higher value greater than 720°C; on the other hand, Graphite is a high-energy material with a surface tension of 230mN.m-1 at 720°C. As the temperature of the melt increases, the thickness of the reaction product layer between the molten silver and the carbon ring will exceed the thickness of the critical optimal reaction layer, forming a brittle interface, and the performance will deteriorate, resulting in a decrease in the overall performance of the composite film.

[0028] 2) Carbon ring preheating temperature: the higher the preheating temperature, the easier for the metallic silver melt to penetrate into the deep layer of the preform, and the slower the cooling and solidification rate, the more adequate the impregnation, the higher the preheating temperature, the deeper the impregnation depth.

[0029] 3) External pressure: In vacuum pressure impregnation, the external pressure is the direct impregnation power. The greater the pressure, the deeper the impregnation depth.

[0030] 4) Cooling rate: The slower the cooling rate, the easier the molten silver liquid flows into the deep layer of the carbon ring. But at the same time, if the cooling rate is slow, according to the composite effect theory of the composite material interface, the more sufficient the reaction between the molten silver and the carbon ring interface is, the easier it is to form a brittle interface, resulting in a decrease in the performance of the carbon seal ring of the A composite silver film.

[0031] 5) Carbon ring gap: the most direct and most serious impact on the impregnation depth. According to the relationship between capillary pressure PC and contact angle θ, the finer the gap, the easier the molten silver liquid penetrates into the deep layer of the carbon ring, and the deeper the immersion depth.

PUM

Property	Measurement	Unit
The inside diameter of	10.0	cm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple structure
reasonable design

Four-freedom-degree single-action platform parallel mechanism capable of achieving motion of selective compliance assembly robot arm (SCARA)

ActiveCN102922513ASimple structurerelatively simple kinematics

Owner:TSINGHUA UNIV

Silver thin film composited carbon sealing ring and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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