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Silicon carbide ceramic sealing ring and preparation method thereof

A silicon carbide ceramic and sealing ring technology, which is used in engine seals, mechanical equipment, engine components, etc., can solve the problems of poor performance and low density of ceramic products, improve mechanical properties, enhance adsorption capacity, and promote mixing. Effect

Pending Publication Date: 2021-01-26
HENAN ARYAN SPEICAL CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of low density and poor performance of ceramic products in silicon carbide ceramic seal rings that have been widely used in the field of mechanical seals, a large number of existing technologies, such as patent documents with publication number CN101514750A, have proposed composite materials to prepare silicon carbide Technical solutions for ceramic sealing rings. Most of these technical solutions provide the driving force to support the sintering process by adding a large amount of sintering aids, and the large amount of sintering aids is directly mixed with silicon carbide raw materials by simple mechanical mixing.

Method used

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  • Silicon carbide ceramic sealing ring and preparation method thereof

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preparation example Construction

[0020] The following describes the preparation method of the silicon carbide ceramic sealing ring proposed in this application, which may include the following steps: preparing raw materials. Silicon carbide is used as the main raw material, and the first sintering aid, the second sintering aid, water reducer and other additives are introduced as auxiliary raw materials. Wherein, silicon carbide may be selected from one or a combination of nanoscale α-type silicon carbide, nanoscale β-type silicon carbide, submicron-scale α-type silicon carbide, and submicron-scale β-type silicon carbide. Wherein, the first sintering aid can be selected from amorphous carbon (carbon black), activated carbon, crystalline elemental carbon (nanoscale single-layer or multi-layer graphene and graphene oxide), carbon nanotubes, mesophase carbon microspheres, One or a combination of organic precursors of carbon, carbides, borides, nitrides, silicides and oxides of metals. Wherein, the second sinteri...

Embodiment 1

[0025] This embodiment proposes a method for preparing a silicon carbide ceramic sealing ring, which may include the following steps: preparing raw materials. Using nanoscale α-type silicon carbide as the main raw material, introducing graphene and carbon nanotubes as the first sintering aid, introducing boron carbide as the second sintering aid, introducing polystyrene sulfonate as a water reducer, and introducing silicon micropowder And talcum powder as other additives. The weight percent composition of each component in the preparation method is as follows: the first sintering aid accounts for 7%, the second sintering aid accounts for 3%, the water reducing agent accounts for 1%, other additives account for 1%, and silicon carbide accounts for 88%. %. Graphene:carbon nanotubes=3:7 in the first sintering aid. Microsilica powder:talc powder=0.4:0.6 in other additives.

[0026] Prepare premixed slurry. Dissolving part of the water reducer in the prepared solution, adding s...

Embodiment 2

[0029] This embodiment proposes a method for preparing a silicon carbide ceramic sealing ring, which may include the following steps: preparing raw materials. Using nanoscale α-type silicon carbide as the main raw material, introducing graphene and carbon organic precursor (phenolic resin) as the first sintering aid, introducing boron carbide as the second sintering aid, and introducing polystyrene sulfonate as the reducing agent Aqueous agent, introducing silicon micropowder and talcum powder as other additives. The weight percent composition of each component in the preparation method is as follows: the first sintering aid accounts for 7%, the second sintering aid accounts for 3%, the water reducing agent accounts for 1%, other additives account for 1%, and silicon carbide accounts for 88%. %. Graphene:phenolic resin=3:7 in the first sintering aid. Microsilica powder:talc powder=0.4:0.6 in other additives.

[0030] Prepare premixed slurry. Dissolving part of the water re...

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Abstract

The invention relates to a preparation method of a silicon carbide ceramic sealing ring, which is characterized by at least comprising one or more of the following steps of by using silicon carbide asa main raw material, introducing one or more of a first sintering aid, a second sintering aid, a water reducing agent and other aids according to a preset mass ratio, carrying out pulverization mixing, and granulating and sintering the premixed slurry obtained after mixingto obtain the silicon carbide ceramic sealing ring. The premixed slurry comprises first premixed slurry and second premixed slurry which are obtained in the mode that silicon carbide and a second sintering aid are powdered and mixed with a first sintering aid and / or the water reducing agent which are / is added at least twicerespectively.

Description

technical field [0001] The invention relates to the technical field of sealing rings, in particular to a silicon carbide ceramic sealing ring and a preparation method thereof. Background technique [0002] The seal ring is a key basic part of dynamic seal widely used in mechanical seal devices, which is directly related to the reliability, range and life of the pump seal. The mechanical seals it configures are widely used in various fields such as aerospace, petroleum, chemical industry, machinery, food, pharmaceuticals, and automobiles. For example, in the clutches of AT (Automatic Transmission, automatic transmission) and CVT (Continuously Variable Transmission, continuously variable transmission) used in automobiles, seal rings such as O-rings and D-rings are used. The pressure to realize the clutch clutch. The dynamic sealing materials used in early mechanical seals are composed of steel, alumina, cermets, hard alloys, etc. These materials have short service life and p...

Claims

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Application Information

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IPC IPC(8): C04B35/565F16J15/26C04B35/626C04B35/64
CPCF16J15/26C04B35/565C04B35/6261C04B35/62695C04B35/64C04B2235/425C04B2235/422C04B2235/3821C04B2235/3418C04B2235/349C04B2235/661C04B2235/77
Inventor 马红彬陈志伟
Owner HENAN ARYAN SPEICAL CERAMICS
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