Fundamental Investigation of Application Possibility of Fe-based Coatings for Thermal Insulation

铁基非晶涂层如Fe 25 Cr 8 Mo 10 W-5 Mn 5 B2C 2Si的低热导率（<3 W/mK）和相对高的热膨胀系数（>14*10-6 K-1）提供了将这种铁基非晶涂层用于高达400 ℃的热绝缘的可能性，低于400 ℃时使用铝合金。到目前为止，这种可能性几乎没有被调查过。本申请的目的是从根本上研究使用铁基非晶涂层用于铝部件隔热的可能性。为了实现这一目的，生产并表征了新型铁基喷涂材料。以Fe_（25）Cr_（88）Mo_（10）W_（55）Mn_（52）B_（22）C_（22）Si为参照，采用大气等离子喷涂和HVOF喷涂对这些新粉末进行热喷涂。系统地研究了喷涂材料、工艺和参数对非晶相组成和显微结构的影响，从而对非晶相的热导率、膨胀系数和晶化温度等热物理性能的影响。这些铁基涂层的抗氧化性，热稳定性和热冲击行为将使用不同的炉试验进行评估。

The low thermal conductivities (<3 W/mK) and relatively high thermal expansion coefficients (>14*10-6 K-1) of Fe-based amorphous coatings such as Fe25Cr8Mo10W-5Mn5B2C2Si provide a possibility to apply such Fe-based amorphous coatings for thermal insulation up to 400 °C, below which Al-alloys are used. Up to now, this possibility has hardly been investigated. The purpose of this application is to investigate fundamentally the possibility of using Fe-based amorphous coatings for thermal isolation of Al parts. To achieve the purpose, new Fe-based spray materials are produced and characterized. These new powders are sprayed thermally by atmospheric plasma spraying and HVOF-spraying in comparison to Fe25Cr8Mo10W5Mn5B2C2Si as reference. The influence of spray materials, processes and parameters on phase composition and microstructure, thus on thermo-physical properties like thermal conductivity, expansion coefficient and crystallization temperature of amorphous phases will be systematically studied. The oxidation resistance, thermal stability and thermo-shock behavior of these Fe-based coatings will be evaluated using different furnace tests.