PDF(Pubmed)
Abstract：
Fibers crystallize and become brittle at high temperatures for a long time, so the surface coating must maintain long-lasting emission performance, which requires superior antioxidant properties of the high-emissivity fillers. To improve the radiation performance of the coating and the tensile strength of the fiber fabric, a double-layer coating with high emissivity was prepared on the surface of flexible aluminum silicate fiber fabric (ASFF) using MoSi2 and SiC as emissive agents. The incorporation of borosilicate glass into the outer coating during high-temperature oxidation of ZrB2 results in superior encapsulation of emitter particles, effectively filling the pores of the coating and significantly reducing the oxidation rate of MoSi2 and SiC. Furthermore, the addition of an intermediate ZrO2 layer enhances the fiber bundle\'s toughness. The obtained double-coated ASFF exhibits an exceptionally high tensile strength of 57.6 MPa and a high bond strength of 156.2 kPa. After being subjected to a 3 h heating process, the emissivity exhibits a minimal decrease of only 0.032, while still maintaining a high value above 0.9. The thermal insulation composites, consisting of a flexible ASFF matrix and a ZrB2-modified double-layer coating, exhibit significant potential for broad applications in the field of thermal protection.
摘要：
纤维在高温下长时间结晶变脆，所以表面涂层必须保持持久的排放性能，这需要高发射率填料的优异的抗氧化性能。为了提高涂层的辐射性能和纤维织物的拉伸强度，以MoSi2和SiC为发射剂，在柔性硅酸铝纤维织物（ASFF）表面制备了高发射率的双层涂层。在ZrB2的高温氧化过程中，将硼硅酸盐玻璃掺入到外部涂层中可获得出色的发射体颗粒封装，有效地填充了涂层的孔隙，并显着降低了MoSi2和SiC的氧化速率。此外，中间ZrO2层的添加增强了纤维束的韧性。所获得的双涂层ASFF表现出57.6MPa的异常高的拉伸强度和156.2kPa的高粘结强度。经过3小时的加热过程后，发射率仅显示0.032的最小下降，同时仍保持在0.9以上的高值。隔热复合材料，由柔性ASFF基质和ZrB2改性的双层涂层组成，在热保护领域具有广阔的应用前景。
