PURPOSE: To obtain fins for cooling having durability and causing no brittle rupture when bushing for forming inorg. fibers is manufactured, by coating Ag 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 Ag 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 ≥3μm thickness between Ag and Pd and to leave a Pd layer of ≥about 2μm thickness. The Ag bar and the Pd pipe united to one body are plastically worked to a 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 Ag as the core material and Pd as the shell material.
YAMAMOTO HIRONOBU
NARA TAKASHI
NITTO BOSEKI CO LTD
| JP45006290A | ||||
| JPS5335854A | 1978-04-03 |