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为提高可重复使用的二氧化硅绝热涂层的高温使用能力,曾对它进行了试验室研究。这种按NAS2-9809改进涂层的研究是基于提高涂层在再入温度下的粘性,以便更好地抗再入时经受的气动剪力。为提高涂层的粘性,而又保持现有生产工艺和烧结规范,采用了下列方法: 1.降低粘性较差的添加剂B_2O_3的浓度 2.减小配制涂层的粉末颗粒尺寸 3.添加一种粘性较好的玻璃成形体(GeO_2)。业已证明,按上述三种方法综合研制的涂层,其粘性比现有涂层的粘性都好,能满足目前航天飞机轨道飞行器涂层的全部要求。
In order to improve the reusable silica thermal insulation coating at high temperature ability, it conducted a laboratory study. This NAS2-9809 coating improvement study is based on increasing the viscosity of the coating at re-entry temperatures to better withstand the aerodynamic shear forces experienced during reentry. In order to improve the viscosity of the coating, while maintaining the existing production process and sintering specifications, the following methods were used: 1. Reduce the concentration of less-viscous additive B 2 O. 3 2. Reduce the powder particle size of the formulated coating 3. Add a Good viscosity of the glass forming body (GeO_2). It has been demonstrated that the coatings developed in accordance with the three methods described above are more viscous than the existing coatings and meet all the current requirements of the space shuttle orbital coating.