Microcapsulation of TiO$lt;inf$gt;2$lt;/inf$gt; precursor and Its Performance as Inhibitor of Erosion

As erosion and wear of gun bore become increasingly serious with the increase of muzzle velocity, chamber pressure and rate of fire, the demand for their high effective inhibitor is urgent. TiO 2 precursor microcapsules with polyvinyl alcohol (PVA) as wall material were prepared by interfacial crosslinking method in W/O/W multiphase emulsion. The microcapsules were characterized by scanning electron microscope (SEM), particle size analyzer, fourier transform infrared spectrometer (FT-IR), thermogravimetric analyzer (TG). The results showed that the microcapsules were dispersive spherical particles at average size of 10 m with integral and dense shell. The microcapsules were composed of about 35% solid TiO 2 and aldol resin layer. Its anti-erosion effect was tested by erosion tube method, and showed that the combustion law of propellant was not affected after application and the anti-erosion efficiency was 35% when added 2.5wt% microcapsules relative to propellant mass.