| 摘要 |
PURPOSE:To obtain fins for cooling having durability and causing no brittle rupture when bushing for forming inorg. fibers is manufactured, by coating Cu fins for cooling with Pd or a Pd alloy so as to form a composite material. CONSTITUTION:Plural nozzles 2 are projected in lines from the bottom plate of the body 1 of a vessel for storing a starting material for fibers, and fins 3 for cooling connected to a pipe 4 for water cooling are placed among the lines of the nozzles 2 without bringing the fins 3 into contact with the nozzles 2 and the body 1. A round Cu bar is fixed in a Pd or Pd alloy pipe, and diffusion treatment is carried out in gaseous N2 so as to form a diffusion layer of >=3mum thickness between Cu and Pd and to leave a Pd layer of >=about 2mum thickness. The Cu bar and the Pd pipe united to one body are plastically worked to prescribed shape and subjected to strain relief annealing. The fins 3 are made of the resulting composite material. The fins 3 for cooling do not cause warping deformation due to the difference in coefft. of thermal expansion between Cu as the core material and Pd as the shell material. |
