Manufacturing Methods for Dispersion Strengthened Copper.
Final rept. 15 May 67-15 Mar 70,
SYLVANIA ELECTRIC PRODUCTS INC TOWANDA PA CHEMICAL AND METALLURGICAL DIV
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Oxide-strengthened copper forms were processed from powders prepared by spray drying, calcining, and selective hydrogen reduction. The powders were compacted, sintered, and hot consolidated. Two major problems were encountered in the preparation of consolidated forms. The forms were frequently not sound that is, they contained a sufficient amount of oxygen so as to cause expansion of the material upon heating to a sufficiently high temperature in a reducing atmosphere. Another problem was that the dispersion of the oxide was generally highly agglomerated. It was possible to eliminate the contamination of the material by oxygen. However, we were not able to eliminate completely the agglomeration of the ThO2 particles. Cu-1.0ThO2 forms were processed which consistently exhibited conductivities of about 95 IACS. Good high temperature tensile properties were possible to attain. The best high temperature tensile properties were obtained from Cu-1.0ThO2 samples which were rolled from plate hot consolidated by press forging and rolling. The 600C tensile properties were UTS-21.2 ksi, 0.2 YS-20.4 ksi, and elongation - 9.3. The average 600C properties of sheet samples from the hot press forged and hot rolled plates were UTS-15.3 ksi, 0.2 YS-14.1 ksi, and elongation - 7.3. The average room temperature properties obtained from various rolled Cu-1. 0ThO2 samples after 800C anneals were UTS-43.1 ksi, 0.2 YS-31.1 ksi, and elongation-31.0. Both the average room temperature and 600C 0.2 YSs obtained exhibit approximately a 4-5 fold increase over comparable properties of OFHC copper. Author
- Fabrication Metallurgy