Patent ID: 8506922

Claim:
A method for manufacturing composite sintering materials using carbon nanotubes, comprising: generating a carbon nanotube in a metal powder particle by: uniformly spraying and mixing a diluted HF solution, nital, diluted sulfuric acid or phosphoric acid to a mixture of a dispersed carbon nanotube solution and one metal powder selected from the group consisting of pure iron powder, pure copper powder, iron/copper/nickel/molybdenum alloy powder, iron/phosphorous powder, and iron/tin alloy powder; injecting ammonia gas to the mixture, to which the diluted HF solution, nital, diluted sulfuric acid or phosphoric acid has been sprayed and mixed, while maintaining an appropriate temperature; and injecting acetylene gas, methane gas, or carbon dioxide gas into the mixture to which the ammonia gas has been injected; compacting a predetermined form by pressing the metal powder; sintering the predetermined form in an atmosphere of nitrogen gas to grow the generated carbon nanotube; further generating the carbon nanotube in pores of the predetermined form by: impregnating the sintered predetermined form with the diluted HF solution, nital, or phosphoric acid; injecting the ammonia to the impregnated predetermined form in the appropriate temperature; and injecting the methane gas, carbon dioxide gas, or acetylene gas to the impregnated predetermined form to which the ammonia has been injected to re-generate the carbon nanotube with increased toughness; and resintering the sintered predetermined form in which the carbon nanotube has been generated in the atmosphere of nitrogen gas to further grow the carbon nanotube.