Thermally treating a thin part e.g. large-sized aspheric mirrors, comprises vertically placing a thin part during the heat treatment, where the treatment is an annealing process which is carried out to slacken internal stresses in the part

摘要

The method comprises vertically placing a thin part (2) during the heat treatment. The heat treatment is an annealing process which is carried out to slacken internal stresses present in the thin part due to its delayed elasticity. The thin part is covered with thin layers, which are capable of generating other internal stresses.