Rotary target for medical X=ray tube - has stabilised molybdenum alloy substrate to reduce distortion (NL 28.1.80)

Rotary target for X-ray tubes has a substrate of Mo alloyed with a stabilising amt. (0.05-10 wt.%) of Fe, Si, Co, Ta, Nb, Hf and/or stable metal oxide and opt. also with an inert carbide. Distortion is prevented, making the target suitable for use in medical X-ray tubes. Pref. the Mo is alloyed with 0.5-5 (1-2)% Y2O3; 0.05-0.3 (0.08-0.125)% Co or Si; 1.25-2.25% Ta, Nb or Hf; or 0.05-0.3 (0.0825)% Fe and 0.5-5 (1)% Y2O3. The target is provided with an electron bombardment zone of W alloyed with a small amt. (0.5-35 wt.%) of Re.