Physical and Mechanical Properties and Oxidation-Resistant Coatings for a Tungsten-Base Alloy

摘要

The physical and mechanical properties of the commer¬cially available 90 W - 6 Ni - 4 Cu alloy and its 0.2 (percent by weight) boron modification are presented in this report. The effects of irradiation on tensile strength and dimen¬sional stability also are included.nThe status of the oxidation-resistant-coating program for the alloy is summarized. Two promising coatings are intro¬duced (the GE-81 braze alloy and the Coast Metals 50 Special alloy), and their performance is described. The latter coating, although not fully developed, shows promise for 300-hour operation at 1500°Fundertemperature-cycling conditions.