Abstract
Os–Ir–Al alloy was fabricated by powder metallurgy technique. IrAl and OsIr interalloys were synthesized to reduce the Al evaporation and ensure the composition of the ternary alloy. Analysis on microstructures shows that each component is distributed homogeneously, and the green density reaches 94.9 %. Ba–W cathodes with Os–Ir–Al alloy magnetic sputtered on the tips are prepared and directly current density tests are carried out on these cathodes. It is found that at 1,050 °C, the average zero field emission density of the cathode reaches up to 20 A·cm−2. The improvements of cathodic current density and stability may indicate the prosperous application of Os–Ir–Al alloy on cathode.
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