Grain refinement is one of the most effective methods to improve the intensity of metals. The method of strengthening metal-alloy-matrix material by adding nano ceramics means spreading powders of nano ceramics to alloy evenly to accelerate the nucleation of alloy and meanwhile restrict the growth of grain and expansion of microcracks in order to refine the grain and improve intensity of product. For example, by adding powders of silicon carbide nanopowder, silicon nitride nanopowder, titanium nitride nanoparticle and silicon nanoparticle to metal matrix (aluminium, copper, silver, steel and ferroalloy), we can make the new-type metal material of light weight, high intensity and excellent heat resistance.
1. Zirconium Carbide nanopowder used for improving intensity and corrosion of hard alloy
Zirconium carbide nanoparticle is a kind of important high-temperature structural material with high melting point, high intensity and corrosion resistance. The application in hard alloy can improve the intensity and corrosion resistance of materials.
2. Coating Material
The application of nano materials to coating can improve the abrasion resistance, corrosion resistance and oxidative stability. A large amount of researches have proved that the application of silicon carbide nanopowders, Zirconium carbide nanoparticles, Titanium carbide nanopowders, Titanium nitride nanoparticles, Boron carbide nanopowders to the compound coating of metal can give super abrasion resistance and self-lubrication. Its abrasion resistance is 100 times higher than bearing steel, friction coefficient being 0.06~0.1, and meanwhile it is also equipped with high-temperature stability and abrasion resistance. The application of nano technology to the key parts of engineer of liquid rocket can largely lengthen the service life of these parts.