Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of antioxidant SiC compound protecting layer on surface of graphite carbon material

A graphite carbon and protective layer technology, applied in the field of materials, can solve the problems of difficult realization of large workpieces, unsatisfactory effects, and inconspicuous effects, and achieve the effects of high bonding strength, improved graphite oxidation resistance, and reduced costs

Active Publication Date: 2016-07-13
石志强
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The best combination so far is B 4 C-SiC, but at 900-1100℃ because B 2 o 3 Evaporation and SiO 2 It is still solid, and there is a large amount of gas in the glass phase, and it is easy to produce a large weight loss in this temperature range. Even if the third phase ceramic component is added, the effect is still not obvious
In addition, this method is generally only suitable for self-sintered graphite material products, which is not as widely applicable as the coating method
[0009] At present, physical coatings such as dipping are mainly used on large workpieces of graphite materials, and the effect is not ideal, while chemical methods are limited to laboratory technology, and the cost is high, and it is still difficult to realize on large workpieces.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of antioxidant SiC compound protecting layer on surface of graphite carbon material
  • Preparation method of antioxidant SiC compound protecting layer on surface of graphite carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Immerse the processed refined aluminum in polydimethylsilane under vacuum conditions on the surface of the graphite shaft, dry it and dip it in glaze (1400°C glaze), after drying, keep it in a high-temperature furnace at 1400°C under an argon atmosphere for 0.5 hours, after cooling down take out. The service life of the treated graphite shaft is more than 8 times longer than that of the untreated graphite shaft under the same normal use conditions.

Embodiment 2

[0044] Spray phenyl polysilane on the surface of the processed refined aluminum with graphite vent pipe, dry it and spray glaze (glaze at 1300°C), put it into a graphite crucible after drying, seal it with a cover, and put it in a high temperature tube furnace at 1300°C Keep it for 1.5 hours and take it out after cooling down. The service life of the treated graphite vent tube is more than 5 times longer than that of the untreated graphite vent tube under the same normal use conditions.

Embodiment 3

[0046] Spray the silicon powder slurry on the surface of the processed refined aluminum with a graphite turntable, the concentration is 1000g / L, spray the glaze after drying (glazing at 1350°C), after drying, put it in a high-temperature box furnace at 1350°C in a nitrogen atmosphere Keep it for 1 hour, take it out after cooling down, the service life of the treated graphite turntable is more than 10 times longer than that of the untreated graphite turntable under the same normal use conditions.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of an antioxidant SiC compound protecting layer on surface of graphite carbon material. The preparation method comprises the following steps: coating the surface of a machined graphite carbon material workpiece with a silicon source material, further coating the surface with a glaze material, and putting the workpiece into a corresponding crucible, or firstly putting the workpiece into the crucible, filling the crucible with the silicon source material and accessories, carrying out once high-temperature processing on the crucible in a high temperature furnace to form an SiC protecting layer (the glaze material is not utilized) or an SiC / glaze compound protecting layer (the glaze material is utilized), or coating the workpiece with the SiC protecting layer formed after the once high-temperature processing, and carrying out secondary heat processing on finished glaze, so as to form the compound protecting layer. According to the method, the cost can be remarkably lowered, the process is simple to implement, and the batch production can be realized; and the method is an efficient preparation method capable of remarkably improving the oxidation resistance of graphite. The prepared protecting layer has heat shock resistance and has equivalent coefficient of thermal expansion with a matrix, so that the service life is greatly prolonged.

Description

technical field [0001] The invention relates to a method for preparing an anti-oxidation SiC composite protective layer on the surface of a graphite carbon material. The graphite carbon material is a non-metallic solid material composed of graphite carbon as the main element, and belongs to the field of material technology. Background technique [0002] Graphite is an important conductive material and structural material in metallurgy, chemical industry, electric power, electronics, aerospace, machinery and other industrial sectors. It is also an important structural material in nuclear reactors, especially high-temperature gas-cooled reactors. Graphite carbon materials can be divided into graphite electrodes, carbon blocks, graphite anodes, carbon electrodes, pastes, electric carbons, carbon fibers, special graphites, graphite heat exchangers, etc. according to product uses. Graphite electrodes can be divided into ordinary power graphite electrodes, high power electrodes, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/5059C04B41/52C04B41/89C04B2111/20C04B41/5022C04B41/4554C04B41/455C04B35/522
Inventor 石志强
Owner 石志强