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

Fe25Cr8Mo10W-5Mn5B2C2Si等铁基非晶态涂层的低导热系数（<3 W/mK）和相对较高的热膨胀系数（bbb14 *10-6 K-1），为将这种铁基非晶态涂层应用于高达400°C的绝热提供了可能，低于400°C则使用铝合金。到目前为止，这种可能性几乎没有被调查过。本应用的目的是从根本上研究使用铁基非晶涂层对铝部件进行热隔离的可能性。为达到这一目的，制备了新型铁基喷塑材料并对其进行了表征。以Fe25Cr8Mo10W5Mn5B2C2Si为对照，采用大气等离子喷涂和hvof喷涂两种方法进行热喷涂。系统研究喷涂材料、工艺和参数对相组成和微观结构的影响，从而对非晶相导热系数、膨胀系数和结晶温度等热物理性能的影响。这些铁基涂层的抗氧化性、热稳定性和热冲击性能将通过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.