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Preparation method of silicon carbide-based composite material mechanical sealing sliding part

A technology of mechanical seals and sliding parts, which is applied in the direction of mechanical equipment, engine seals, engine components, etc., can solve the problems of high production cost, uneven distribution of lubricating medium, long process cycle, etc., and achieve good sliding performance and sealing performance, Effects of improving sliding performance and sealing performance and reducing production cost

Active Publication Date: 2017-06-20
ZHUZHOU TORCH SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2. The spherical micropores on the surface of the sealing ring are unevenly distributed, which makes the distribution of the lubricating medium between the dynamic and static ring contact surfaces of the silicon carbide ceramic sealing device uneven, and it is easy to cause the phenomenon of suction. When starting the machine, the suction force is very strong. Large, it is easy to cause wear or even breakage of the seal, which will affect the service life of the product;
[0010] 3. Silicon carbide ceramic composite materials are prone to wear or even fracture during work, which affects the service life of the product;
[0012] 4. SiC / graphite composite ceramic materials for mechanical seals, silicon carbide mechanical seal materials have low self-lubricating properties, bending strength and fracture toughness;
However, the implementation of this preparation method has problems such as long process cycle and high production cost.

Method used

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  • Preparation method of silicon carbide-based composite material mechanical sealing sliding part
  • Preparation method of silicon carbide-based composite material mechanical sealing sliding part
  • Preparation method of silicon carbide-based composite material mechanical sealing sliding part

Examples

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Effect test

Embodiment 1

[0041] Example 1: A method for preparing a silicon carbide-based composite material mechanical seal sliding part, which is to prepare a carbon mixture first, then mix the carbon mixture with pressureless sintered silicon carbide powder, sinter the mixture to form a blank, and then The blank is ground and processed into a finished product. After research, the applicant found that in the prior art, when various improvements are made to the sealed sliding parts containing silicon carbide, the silicon carbide raw material is generally firstly mixed with other additives, as shown in the first In the first) step of the first patent document (the application publication number is CN103641482A), the submicron α-type silicon carbide, boron carbide, resin, organic binder and lubricant are directly put into the mixer and pure water is added for Wet mixing; in the first) step of the second patent document (the application publication number is CN103922743A), the submicron α-type silicon c...

Embodiment 2

[0063] Embodiment 2: compared with embodiment 1, difference is: the preparation steps of carbon mixture are:

[0064]a. According to parts by weight, take 20 parts of graphite powder and 2.5 parts of dry powder binder, put the dry powder material composed of the above graphite powder and dry powder binder into the mixing tank, seal it and mill it on a ball mill for 80 minutes, and mix thoroughly Then pour into the kneader;

[0065] b. Start the kneader and start stirring for 80 minutes and gradually increase the temperature of the kneader to 112°C, evaporate the water in the dry powder, and then gradually lower the temperature to 82°C;

[0066] c. In parts by weight, take 9 parts of resin (preferably phenolic resin), 4 parts of alcohol, and 0.5 part of oleic acid, add the above materials into the container and stir evenly to form a resin adhesive, and then pour the resin adhesive into the kneader At this time, control the temperature of the kneader at 53°C, fully knead and st...

Embodiment 3

[0074] Embodiment 3: compared with embodiment 1, difference is: the preparation steps of carbon mixture are:

[0075] a. In parts by weight, take 30 parts of graphite powder and 3.5 parts of dry powder binder, put the dry powder material composed of the above graphite powder and dry powder binder into a mixing tank, seal it and mill it on a ball mill for 90 minutes, and mix thoroughly Then pour into the kneader;

[0076] b. Start the kneader and start stirring for 90 minutes, and gradually raise the temperature of the kneader to 115°C, evaporate the water in the dry powder, and then gradually lower the temperature to 85°C;

[0077] c. In parts by weight, take 11 parts of resin (preferably phenolic resin), 5 parts of alcohol, and 0.8 part of oleic acid, add the above materials into a container and stir evenly to form a resin adhesive, and then pour the resin adhesive into a kneader At this time, control the temperature of the kneader at 57°C, fully knead and stir the resin adh...

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Abstract

The invention discloses a preparation method of a silicon carbide-based composite material mechanical sealing sliding part. The preparation method comprises following steps: a carbon mixed material is prepared; the carbon mixed material is mixed with silicon carbide powder obtained via pressureless sintering; an obtained mixture is subjected to sintering so as to obtain a workblank; and the workblank is subjected to ginding so as to obtain a finished product. The preparation method is capable of improving the performance of the silicon carbide-based composite material mechanical sealing sliding part such as sliding performance, shortening the preparation period of preparation of the silicon carbide composite material, and reducing production cost.

Description

technical field [0001] The invention relates to a preparation method of a mechanical seal sliding part, in particular to a preparation method of a silicon carbide-based composite material mechanical seal sliding part. Background technique [0002] Mechanical seal refers to a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, and the cooperation of auxiliary seals to keep fit and slide relative to each other. The main sliding parts of the mechanical seal include the moving ring and the static ring, etc., that is, the mechanical seal mainly prevents fluid leakage through the sliding working surface where the moving ring and the static ring fit together and slide relatively. [0003] In the prior art, a sealed sliding part containing silicon carbide is proposed. Silicon carbide is a material with good heat resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/626C04B35/634F16J15/30
CPCC04B35/565C04B35/62615C04B35/63476C04B2235/425C04B2235/6581C04B2235/9638F16J15/30
Inventor 马勇陈谢华欧阳知止
Owner ZHUZHOU TORCH SPARK PLUG CO LTD
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