3Dプリンタ製インバーによる高形状安定性断熱プレート

抄録

In recent years, the demand for satellite structures with high dimensional stability is becoming severer as space mission becomes more advanced. For example, the telescope is one of the structures that require the highest dimensional stability. To prevent deterioration of observation performance caused by thermal deformation, low thermal expansion materials such as CFRP, glass, and low thermal expansion metals are applied. Especially for the interface parts of such structures, low thermal expansion metals are applied for their strength and machinability. However, there is a problem that these metals such as Invar alloys have high specific gravity. In addition, these interface parts often require thermal insulation as well. Therefore, in this study, we design and develop an interface plate made of Invar, which is light, and has both low thermal expansion and low thermal conductivity. To achieve this goal, we focused on the lattice structure, which can be manufactured by making use of metal additive manufacturing technology. We manufactured 4 types of lattice specimens with Invar, and examined their weight, thermal conductivity, and compression stiffness. It was confirmed that the lattice structure reduced the weight by 70 % or more, and the thermal conductivity by 90 % or more compared to solid member. However, it was identified that there is room for more improvement in experimental technique and analytic technique.