Properties of Thermally Sprayed Titanium Oxide Coatings

       Titanium oxide powder is mostly used to reduce the porosity of composite oxide coatings and improve the deposition efficiency, because the melting point of titanium oxide powder is lower than that of aluminum oxide and chromium oxide. The late-melting alumina or chromia forms a solid solution, which in turn achieves the effect of being added - reducing the porosity of the coating and increasing the toughness and bond strength of the coating. And when pure titanium oxide powder appears as the protagonist, what kind of light will it emit?



First, the bonding strength is higher. Under APS, after priming with nickel-based powder, the bonding strength of the prepared titanium oxide coating is 2/3 higher than that of pure aluminum oxide and pure chromium oxide coating 30Mpa, which is more shock-resistant and more durable. A thick coating lays the foundation. Of course, the current supersonic high-energy plasma thermal spraying system can easily prepare aluminum oxide and chromium oxide ceramic coatings with a bonding strength of more than 50Mpa. We have to sigh that technology is changing with each passing day.



Second, lower porosity. Pure titanium oxide powder has relatively low requirements for thermal spraying equipment. Under relatively economical conditions, a coating with lower porosity can be prepared. If supplemented by laser cladding technology, the coating will be denser, and the corrosion resistance and electrical conductivity will also be improved. will be even better.



3. Excellent thermal vibration performance. Although the melting point of pure titanium oxide powder is low, the coating prepared by it can withstand more than 20 thermal vibration tests without falling off at the sub-high temperature of 200 degrees Celsius, with the advantage of its high bonding strength. This coating is recommended for use in an environment of 538 degrees Celsius.



Fourth, toughness and lubricity. Hardness has never been the strength of titanium oxide coating, but its toughness and lubricity make it useful in terms of resistance to adhesive wear, etc. It is recommended to use this coating under working conditions below HRC40.



Also welcome, colleagues to share other properties of titanium oxide coating, let us have a deeper understanding of it and a wider range of applications. Friendly reminder: Although titanium oxide has relatively low requirements on the voltage and current of thermal spraying equipment compared to aluminum oxide and chromium oxide, special attention should be paid to the powder feeding rate when spraying titanium oxide coating. Too high powder feeding rate will cause coating The excessive deposition, and then the internal stress of the coating increases, and the bonding strength decreases. Therefore, it is recommended to establish an orthogonal test of powder feeding rate and bonding strength to obtain a reasonable powder feeding rate.