Method of hardening an interface of carbon material using nano silicon carbide coating
Disclosed is a method for hardening an interface of a carbon material by using nano silicon carbide coating. A carbon material-aluminum composite prepared by the disclosed method is light in weight, and has a high dynamic strength, and thus can be applied to currently used cars and aluminum wheels. Furthermore, the composite can be utilized as a material for aircrafts, spacecraft, ships, etc. requiring a high strength.
1. A method for enhancing a mechanical strength of aluminum, the method comprising the steps of:
(a) preparing a silicon-carbon material mixture by mixing a silicon nanoparticle with a carbon material;
(b) performing heat treatment by high frequency induction on the silicon-carbon material mixture to form a Si—C covalent bond;
(c) encapsulating the carbon material in aluminum by mixing the carbon material formed with the Si—C covalent bond with the aluminum, followed by ball milling; and
(d) further adding aluminum to the aluminum mixed with the carbon material, followed by melting.
2. The method as claimed in claim 1 , wherein the carbon material is at least one selected from the group consisting of graphite, a graphite fiber, a carbon fiber, a carbon nano fiber, and a carbon nanotube.
3. The method as claimed in claim 1 , wherein the carbon material has a diameter of 0.4 nm to 16 μm, and a length of 10 nm to 10 cm.
4. The method as claimed in claim 1 , wherein the silicon nanoparticle is prepared by ball milling.
5. The method as claimed in claim 1 , wherein the silicon-carbon material mixture is mixed by ball milling.
6. The method as claimed in claim 1 , wherein the carbon material formed with the Si—C covalent bond is formed by the heat treatment by high frequency induction.
7. The method as claimed in claim 1 , wherein the aluminum mixed with the carbon material is formed into a capsule by ball milling.
8. The method as claimed in claim 1 , wherein the high frequency ranges from 100 Hz to 400 kHz.