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在TC4钛合金微弧氧化膜表面制备Ni-P-ZrO2化学复合镀层,研究其在600和700℃空气中的抗高温氧化性能,利用脉冲激光烧蚀处理研究其阻燃性能。结果表明,Ni-P-ZrO2化学复合镀层在600和700℃空气中的氧化动力学曲线呈抛物线形状,氧化膜薄且致密,主要以NiO为主,镀层中非晶的NiP相转变成晶态的Ni2P相,具有良好的抗氧化性能。激光烧蚀处理时,Ni-P-ZrO2镀层烧蚀体积、面积分别是TC4烧蚀的1/3和1/2。镀层激光烧蚀处理后,在烧蚀孔洞内部出现柱状晶粒,ZrO2粒子在镀层表面发生团聚,Ni-P-ZrO2化学复合镀层能有效地提高钛合金的阻燃性能。
Ni-P-ZrO2 electroless composite coating was prepared on the surface of TC4 titanium alloy micro-arc oxidation film to study its high temperature oxidation resistance in air at 600 and 700 ℃. The flame retardancy was studied by pulsed laser ablation. The results show that the oxidation kinetics of Ni-P-ZrO2 electroless composite coating is parabolic in air at 600 and 700 ℃, the oxide film is thin and dense, mainly NiO, and the amorphous NiP phase in the coating is transformed to crystalline Ni2P phase, with good anti-oxidation properties. Laser ablation treatment, Ni-P-ZrO2 coating ablation volume, the area is TC 1/3 ablation and 1/2. After laser ablation, columnar grains appear inside the ablated pores, and ZrO2 particles agglomerate on the coating surface. Ni-P-ZrO2 chemical composite coating can effectively improve the flame retardancy of the titanium alloy.