Ti Based Ato Case Study

In order to avoid the problem of mud cracks and decrease the resistivity, the Ti based ATO (antimony doped tin oxide) coating are prepared by thermal decomposition method on the surface of the porous titanium. The ATO coating was characterized and the preparation conditions were optimized. In the experiments, the sintering temperature and holding time both can promote the oxidization of the substrate Ti. Although the resistivity of ATO is higher than that of Ti, ATO coating can protect the substrate Ti from passivation. In this case, both uneven and excess thickness of the coating coverage will lead the resistivity increase. Under the optimized experiment conditions ( Sb doping content 15%wt, coating 20 times and sintering in 450 °C for 15 min), the Ti based ATO can obtain uniform and compact surface with low resistivity.
Keywords titanium; coatings; electric; resistance; xrd; experimentation; optimization; processes
In this work, the effects of the sintering temperature and time on the resistivity of the materials were investigated.

Figure 6.—The TG curve of the Ti based ATO (Sb doping content 15%wt, coating 20 times)
As can be seen from the TG curve in Figure 6, there are two obvious weight loss steps from 100 °C to 550 °C ( 0.3419% from 100 °C to 350 °C, and 0.1468% from 350 °C to 550 °C). When the temperature is higher than 550 °C, the ATO layer began to sublimate and the substrate Ti came into oxidize, therefore the weight gradually increases.

Figure 7.—The effect of sintering temperature on the resistivity of Ti based ATO ( Sb doping content 15%wt, coating 20 times and holding 15 min)

Figure 8.—The effect of holding time on the resistivity of Ti based ATO ( Sb doping content 15%wt, coating 20 times and sintering in 450