Shuicheng Wan

EFFECT OF ZrO2 POWDERS ON THE PYROLYSIS OF POLYCARBOSILANES COATING UNDER LASER ABLATION

Aircrafts hold the outstanding mastery of the sky in modern wars, however the laser beam weapons can carry out laser attacking to aircrafts. The purpose of the present paper is to research on a new type laser protective material. Polycarbosilanes (PCS)/divinylbenzene mixtures containing ZrO2 powders were brushed to the surface of the aluminum alloy plates and then cured at 150°C for 6 h. The PCS-coated plates were ablated by laser for 3 s. The phase identification of as-ablated powders was examined by X-ray diffraction. The results indicated that the as-ablated powders of cured PCS were composed of major phase β-SiC and smaller amounts of free carbon. The PCS composite coating played a certain role of laser ablation resistance. The effect of added ZrO2 powders on the pyrolysis of PCS-coating under laser ablation is conspicuous.

Influence of Irradiation Time on Laser Ablation Behavior of Polycarbosilanes Coating

Aircrafts hold the outstanding mastery of the sky in modern wars. However, the laser beam weapons can carry out laser attacking to aircrafts. The present paper proposes a new type of coating of laser resistance. Polycarbosilanes (PCS)/divinylbenzene mixtures were brushed to the surface of the Al alloy plates and then cured at 150°C for 6h. The PCS-coated plates were ablated by 1kW laser beam for 1s, 3s, 5s, and 10s. The phase identification of the as-ablated powders was examined by X-ray diffraction. The ablation degree was evaluated by testing the volume change. The results indicated the PCS coating played a certain role in protecting the Al alloy plates by absorbing the laser energy. The residual powders after ablation were composed of major phase β-SiC and smaller amounts of free carbon. Although PCS coating was destroyed while 10s irradiation time, the Al alloy plate was protected. The ablated volume of the coating was consistent with the irradiation time according to a multinomial equation.