1 enhanced surface film

Application of physical or chemical method, the metal coating on the substrate surface properties of different materials to strengthen the film, known as the surface film enhanced. It includes electroplating, electro less plating (chrome, nickel, copper, silver, etc.) and composite plating, brush plating or conversion processing, including high-tech rapid development in recent years: such as CVD, PVD, P-CVD, etc. enhanced vapor deposition film surface hardening methods and ion implantation technology (also known as atomic metallurgy), and so on. Their common feature is able to work a specific performance of the film formed on the surface to enhance the surface wear resistance, fatigue resistance, corrosion resistance and self-lubricating properties. For example, ion implantation technology to enhance the bearing surface, make the bearing surface wear resistance, corrosion resistance, and resistance to contact fatigue performance have been significantly improved, so that the bearing life has been to grow exponentially (Tsunehiro seamless) .

2 enhance surface metallurgy

Use of the surface layer of metal re-melting and solidification, in order to achieve the desired composition or organization of the surface treatment technology known as surface enhanced metallurgical strengthening. Include the surface of the alloy or compound from the insoluble powder coating, surface melting of crystalline or amorphous, surface alloying and other methods. Characterize by high energy density of rapid heating, the metal surface layer or coating on the metal surface alloying material melting, followed by cooling for solidification to get their special structure or specific performance of the enhanced layer. This special structure of the crystal structure may be refined, but also may be supersaturated phase, met stable phase, and even non-crystal structure, depending on process parameters and surface metallurgy methods. Bearing industry has done in the micro-bearing surface enhanced laser heating studies to good effect.

3 chemical heat treatment to strengthen the

Using a solid state diffusion of elements into, to change the chemical composition of the metal surface layer, in order to achieve surface hardening method called chemical heat strengthened, also known as diffusion heat treatment. Including boron zing, alloying, carburizing and carbonitriding, nitriding and nitrocarburizing, and diltiazem sulfide nitrocarburizing, chromizing, aluminizing and Al-Si-Cr permeation, diffusion layer, and so on graphite , a wide range of different characteristics. Into elements or integrated into the base metal to form solid solution, or combined with other metals to form compounds. In short elements that change the surface layer into the chemical composition, and phase structure can be different. Carburizing bearing steel parts of the treatment process and needle bearing sleeve surface nitriding treatment are enhanced to strengthen the methods of this class.
 
 
 



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