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A composite body of silicon carbide and binderless carbon and process for producing

A binder-free, silicon carbide technology, applied in transportation and packaging, lubricating compositions, engine sealing, etc., can solve problems affecting silicon carbide substrates, large graphite, etc.

Inactive Publication Date: 2005-07-27
约翰格兰有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the large and uncontrollable particle size distribution of resin-coated graphite affects the inherent high shrinkage reproducibility of the SiC matrix.

Method used

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  • A composite body of silicon carbide and binderless carbon and process for producing
  • A composite body of silicon carbide and binderless carbon and process for producing
  • A composite body of silicon carbide and binderless carbon and process for producing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A feedstock of the following composition was prepared:

[0036] components weight percentage

[0037] Silicon carbide 85.4

[0038] Boron carbide 0.6

[0039] Phenolic resin 7.0

[0040] Acrylic 5.0

[0041] Polyvinyl alcohol 1.0

[0042] Oleic acid 1.0

[0043] The B.E.T. surface area of ​​this submicron silicon carbide is 15m 2 / g. The median particle size was 0.6 microns. Used is commercially available boron carbide with a B.E.T. surface area of ​​15-20m 2 / g, with a median particle size of 0.5 microns. The liquid water-based phenolic resin has a solids content of 70%. The aqueous emulsion acrylic had a solids content of 45%. Polyvinyl alcohol has a solids content of 21%. Distilled tallow oleic acid is used in this formulation.

[0044] A 40% by weight water-based slurry was prepared with the above components. First, silicon carbide powder is added to the desired amount of distilled water. The water was continuously stirred during the silicon carbi...

Embodiment 2

[0046] Green coke with a volatile content of 14% was ground and sieved through a 100-mesh sieve to obtain a powder with a particle size of less than 150 microns. This powder was dry blended with the silicon carbide shaped powder described in Example 1. A mixture of the following formulations was prepared:

[0047] components weight percentage

[0048] Spray-dried silicon carbide molding powder 95.0

[0049] Green Coke 5.0

[0050] The above mixture was mixed for 5 minutes in a V-blender equipped with intensifying rods. Pipes were isostatically pressed from this powder at a pressure of 17,000 psi. These shaped tubes were cured at 175°C and green processed into the desired ring shape. The rings were sintered at 2100° C. in vacuum. The density of these sintered parts is about 3.02g / cm 3 . figure 2 The surface topography of these polished rings is given. The rings were tested to be gas tight with nitrogen at 100 psig. No microcracks were found in these rings.

Embodiment 3

[0052] The spray-dried phenolic resin was screened to remove all particles larger than 150 microns. Dry blend this powder with silicon carbide molding powder according to the following recipe:

[0053] components weight percentage

[0054] Spray-dried silicon carbide molding powder 95.0

[0055] Spray dried phenolic resin 5.0

[0056] The above mixture was mixed for 5 minutes in a V-blender equipped with intensifying rods. Tubes were isostatically pressed from the above powder blend at a pressure of 17,000 psi. These shaped tubes were cured at 175°C and green processed into the desired ring shape. These machined rings were first carbonized at 600°C in a nitrogen atmosphere and then sintered at 2100°C in vacuum. These sintered parts have a measured density of approximately 2.95 g / cm 3 . image 3 The surface topography of these polished rings is given. It must be seen that there are no micro-cracks and / or interconnecting pores in the rings prepared according to the m...

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Abstract

A composite body of silicon carbide having binderless, allotropic carbon granules distributed throughout is produced. The nominal size of the binderless allotropic carbon granules can range from 5 to 500 micrometers. The concentration of the binderless allotropic carbon particles can vary from 1.0 to 35.0 weight percent. The process to produce such a composite body is to sinter silicon carbide with binderless, carbon-yielding precursor granules. The composite body is utilized in tribological applications. The dense, impervious silicon carbide-binderless carbon composite exhibits excellent physical and tribological characteristics when used as a mechanical face seal, a sliding bearing arrangement, or some other rubbing component.

Description

field of invention [0001] The present invention relates to composites of silicon carbide and binderless allotropic carbon and methods of making such composites. More particularly, the present invention relates to such composites for use in tribological applications, such as mechanical seals, bearings and other sliding or wearing parts, which require good durability and wear properties under less than ideal lubrication conditions . Background of the invention [0002] Materials science has long been the basis for selecting materials for components that have or may have surfaces that are in sliding contact with each other. For example, in the field of mechanical face seals, it is generally known that a primary ring is made of carbon or a carbon-like material, and a primary ring made of another material such as silicon carbide, tungsten carbide, aluminum oxide, stainless steel, etc. Engagement ring. However, in mechanical face seals exposed to highly abrasive fluids, the pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/34C01B31/36C04B35/565C10M103/00F16D69/02
CPCC04B35/6263F16D69/02C04B2235/5409C04B2235/5445C04B35/62655C04B2235/3821C04B2235/3217C04B35/565C04B2235/3205C04B2235/422C04B2235/668C04B2235/80C04B2235/767C04B2235/77C04B2235/3826C04B2235/528C04B2235/604C04B2235/6581C04B2235/762C04B2235/94C04B2235/5436C04B2235/48F16D2200/0043C04B2235/421Y10T428/30
Inventor J·F·德曼迪X·E·陈W·R·克莱门斯
Owner 约翰格兰有限公司
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