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Titanium surface bronzing generated TiB2 phase, hardness is high. According to reports in the literature, the acid pickling of titanium parts after embedding in the amorphous boron powder and A1203 powder evenly mixed powder (including NH4F * HF) with 0.75% 1.0% added, 1 hour in 1010 - degree heat preservation, the TiB2 can generate layer. Under the condition of the above, the coating thickness and varies according to the alloy, pure titanium generated on the coating thickness is 25 p, thickness of TC4 titanium alloy is formed on for 20 um, hardness in HV2800-3450 range. Bronzing temperature requirement is high, which makes its application by certain restrictions. If iron plating on titanium plate first, followed by boride, can reduce the boriding temperature to 870 degrees, the coating thickness can reach 40 um, hardness to HV2300.Because the titanium also react with nitrogen, so must use argon as a carrier. If use oxygen/nitrogen mixture gas (air) as a source of oxygen, the oxygen in the diffusion of temperature (850 ℃) can form nitrides enough it will reduce the diffusion of oxygen. In order to optimize the depth and distribution of oxygen diffusion layer, concentration of oxygen should be high enough, to generate maximum diffusion rate. But it can't up to form a continuous surface oxidation film, according to the report, it will stop the spread.

Hardening the surface of the purpose is to improve the wear resistance, and to eliminate parts under the condition of friction work risk attached to each other. In hardness increase at the same time, may also improve corrosion resistant performance and fatigue strength. Here, first of all, pay attention to the improvement of surface hardness, focus on technology itself and its influence on surface hardness increase. Surface hardening shall be carried out in a protective atmosphere pressure and the stove and well control, it can easily change the processing at the end of the gas composition, to generate uniform pore-free rutile layer. The result is similar TO the TO process. It in step way has carried on the double handle, more do not need such as BDO/TO deal with such three steps, significantly saving energy. The process only with completely inert gas - argon and oxygen, therefore very environmental protection, no poison, cannot cause global warming. Although the process is very good, but the vacuum treatment is expensive, and oxidation/diffusion two-step process has obvious control problem. Even in the vacuum diffusion time constant, small changes in the formation of oxide content in the first step, also can cause the final hardness distribution was significantly different.