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SiC ceramic surface treatment method and application thereof

A treatment method and ceramic surface technology, which is applied in the direction of kitchen utensils, household utensils, rotors, etc., can solve the problems of SiC ceramic body melting, component failure, etc., and achieve the effect of improving wettability, long service life, and improving interface bonding

Inactive Publication Date: 2013-01-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at a certain temperature, SiC can almost chemically react with most metal elements, especially contact with Fe, Co, Ni and Cu elements under high temperature conditions will lead to graphitization reaction, so that a large amount of graphite (C) in the compound Precipitation of the ceramic / metal interface of the material or composite structure, or the substantial melting of the SiC ceramic body in contact with the molten metal, resulting in severe failure of the relevant components

Method used

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  • SiC ceramic surface treatment method and application thereof
  • SiC ceramic surface treatment method and application thereof

Examples

Experimental program
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preparation example Construction

[0023] (2)TiH 2 Preparation of ointment:

[0024] Commercially available TiH 2 Powder, add absolute ethanol, ball mill for 80 hours, dry, pass through a 200 mesh sieve, and then put finely ground TiH 2 Add ethylene oxalate to the glass bottle of powder, and ultrasonically treat it for 20 minutes, then add collodion solution (collodion) into the bottle, and stir with a glass rod for more than 30 minutes before use. where TiH 2 Powder: ethylene oxalate: collodion solution=5g: 4-10ml: 4-10ml.

[0025] (3)TiH 2 Application and drying of ointment;

[0026] Prepared TiH 2 The paste is applied to the surface of the cleaned SiC ceramic body (one side or all surfaces) or the SiC ceramic body is dipped into TiH 2 In paste, TiH is formed 2 coating.

[0027] (4) Vacuum heat treatment:

[0028] will be coated with TiH 2 The SiC ceramics of the paste are placed in a high-temperature vacuum furnace and vacuumed to ≤10 -1Pa, and heated to at least one temperature between 400-700°C...

Embodiment 1

[0031] SiC ceramic surface treatment method in the process of preparing SiC ceramic support-cast iron composite material by sand casting process

[0032] (1) Surface treatment of SiC ceramics

[0033] (1) SiC ceramic surface cleaning treatment: After the SiC ceramic support was boiled and washed with dilute alkali for 20 minutes, it was rinsed with a large amount of tap water, then ultrasonically cleaned with absolute ethanol for 20 minutes, taken out and dried with a hair dryer.

[0034] (2)TiH 2 Ointment preparation: first commercially available TiH 2 Powder, add absolute ethanol, roll and mix ball mill for 80 hours, dry, pass through a 200 mesh sieve, and then put in the finely ground TiH 2 Add ethylene oxalate to the glass bottle of powder, and ultrasonically treat it for 20 minutes, then add collodion solution (collodion) into the bottle, and stir it with a glass rod for 60 minutes before use. where TiH 2 Powder: ethylene oxalate: collodion solution = 5g: 4ml: 4ml.

...

Embodiment 2

[0040] SiC ceramic surface treatment method in the process of preparing porous SiC ceramic / Cu composite material by vacuum infiltration method

[0041] (1) Surface treatment of SiC ceramics

[0042] (1) SiC ceramic surface cleaning treatment: After the porous SiC ceramic was boiled and washed with dilute alkali for 20 minutes, it was rinsed with a large amount of tap water, and then ultrasonically cleaned with absolute ethanol for 20 minutes, taken out and dried with a hair dryer.

[0043] (2)TiH 2 Ointment preparation: the process of this step is the same as in Example 1.

[0044] (3)TiH 2 Paste coating and drying: Dip the cleaned porous SiC ceramic into the above TiH 2 In the ointment, after being ultrasonically oscillated for 20 minutes, take it out and dry it in a vacuum drying oven at 80°C.

[0045] (4) Vacuum heat treatment: to be dipped with TiH 2 The paste and dried porous SiC ceramic support was placed in a vacuum furnace and vacuumed to 10 -1 Above Pa, heat to ...

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Abstract

The invention discloses a SiC ceramic surface treatment method and application thereof. The SiC ceramic surface treatment method is characterized by comprising the following steps of: firstly, cleaning the surface of SiC ceramic, then preparing TiH2 paste, coating the TiH2 paste on the surface of the ceramic, drying, then placing the dried ceramic into a vacuum furnace, and performing heat treatment to completely decompose the TiH2 so as to form active TI, reacting Ti and SiC to from a Ti(C,Si) composite ceramic layer with certain metalicity and high stability on the surface of a ceramic body. According to the invention, in the process of preparing an SiC ceramic-metal base composite material or composite part or in the contact process between SiC ceramic, serving as a heating body or potbody, and molten non-ferrous metal, a SiC ceramic matrix can be prevented from being molten by the molten metal, or the wettability is increased and the bonding interface is improved, so that a subsequently prepared composite material or structure, welding part or ceramic part in contact with the molten metal achieves the advantages of high reliability, long service life and the like.

Description

technical field [0001] The invention relates to a SiC ceramic surface treatment method and its application in the fields of ceramic-metal composite materials, ceramic welding, nonferrous metal melting and the like. SiC ceramics include full SiC ceramics and SiC-based composite ceramics. Background technique [0002] Due to its excellent physical, mechanical and chemical comprehensive properties (such as high strength, high modulus, high hardness, high thermal conductivity, high electrical conductivity, wear resistance, abrasion resistance, thermal shock resistance, creep resistance, oxidation resistance, low Coefficient of thermal expansion), forming composite materials or composite structures with metal materials (such as composite armor, ceramic / metal welded parts), is very important in the manufacture of wear-resistant parts, high-temperature components and protective structures, as well as in the fields of non-ferrous metal melting effect. However, at a certain temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/00C04B41/85C04B35/565C04B37/00
Inventor 刘桂武乔冠军王倩王红洁王继平史忠旗杨建锋
Owner XI AN JIAOTONG UNIV