Microcapsulation of TiO2 precursor and Its Performance as Inhibitor of Erosion

doi:10.15541/jim20140205

Abstract

Abstract:

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. TiO₂ 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 μm with integral and dense shell. The microcapsules were composed of about 35% solid TiO₂ 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.

Key words: erosion and wear, inhibitor, TiO2 precursor, microcapsule

CLC Number:

TJ307

LI Hong-Guang, YAN Jun, WANG Ming-Qiu, MENG Sheng-Hao, DU Shi-Guo. Microcapsulation of TiO₂ precursor and Its Performance as Inhibitor of Erosion[J]. Journal of Inorganic Materials, 2015, 30(1): 47-52.

Figures/Tables 11

Fig. 1 Preparing process of microcapsules

Fig. 2 Microscope graph of stabled W/O emulsion

Fig. 3 SEM images of microcapsules

Fig. 4 Particle size distribution of microcapsules

Fig. 5 Process of interfacial crosslinking

Fig. 6 FT-IR spectra of samples. (a) Aldol resin; (b) Microcapsule; (c) TiO2

Fig. 7 TG/DTG curves of samples. (a) Aldol resin; (b) Microcapsule

Fig. 8 DSC curves of microcapsules and their mixture with propellant

Fig. 9 P-t curves at different conditions

Table 1 The results of erosion test

Propellant mass/ g	Inhibitor mass/ g	Average pressure/ MPa	Amount of erosion/ mg	Erosion-reducing efficiency/ %
11.8	-	245.2	399.7	-
11.8	0.3	247.9	260.9	34.7
11.8	0.5	242.9	256.8	35.8
11.8	0.8	248.7	289.7	27.5

Fig. 10 SEM images of microcapsules after calcined at 800℃(increased from normal temperature at 5 ℃/min) (a) and directly at 800℃ (b, c) for 10 min

References 25

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Microcapsulation of TiO₂ precursor and Its Performance as Inhibitor of Erosion

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