激光器因其自身的特点得到了长足的发展和广泛的应用,相应的,随着激光的军事化应用所产生的激光威胁必须得到妥善解决,为了保护装备及其基体不受激光损伤和破坏,激光防护必不可少.而现阶段,对于大功率连续激光而言,其对材料的破坏形式主要是热破坏,表现为被辐照材料温度达到一定临界点后,以氧化、熔融、气化的形式发生不可逆的损耗,所以为了保证装备及其基体不发生上述破坏,采用一定的方式消耗入射激光能量,进而减小激光热量转化和沉积使得温度降低到材料损伤阈值以下,是可行的方式之一.因此,基于上述机制选用了一种常见的焓变涂料CaCO3作为研究对象,探究了其激光烧蚀行为和防护能力.研究结果表明,CaCO3涂层明显降低了基体材料在激光辐照下的温度,实现了入射激光能量的有效耗散.并经初步计算,单位面积(1 cm2)涂层可耗散0.473 kJ的能量,可降低45钢基体温度约53℃.
Due to its own characteristics,laser has been greatly developed and widely used.Laser threat must be resolved properly with the laser used in the military fields.To protect the substrates and equipments from threats and damage,laser protection is greatly necessary.The laser energy accumulation on the material will cause a terrible problem.At present,the main damage form is thermal destruction of high power continuous laser.When the temperature reaches the threshold of the material,the material will be consumed by oxidation,melting and evaporation.In order to ensure the substrates and equipments away from damage,decreasing the incidence laser energy is an effective way,and in turn decreasing the temperature below the threshold of the material.Therefore,in this paper,a common enthalpy change material,CaCO3,was studied.The laser damage behavior and protection ability of CaCO3 coatings were explored.The results show that the substrate back-surface temperature decreased obviously,while CaCO3 coatings with the thickness of 1 mm dissipated effectively of the incident laser energy.From calculation,0.473 kJ energy per unit area (1 cm2) can be dissipated,and 53 ℃ can be decreased for the No.45 steel substrate,which agrees with the experimental results.
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