Additive manufacturing of platinum group metal oxide dispersion strengthened alloys

An article formed of an oxide dispersion strengthened platinum group metal alloy is made by powder bed fusion of a powder mixture comprising a first powder of one or more platinum group metals or an alloy thereof and a second powder of one or more non-platinum-group metals or metalloids, or one or more alloys thereof, where the powder mixture comprises 0.01-0.05 % by weight of the second powder. Oxidation of the second powder is performed either by performing the powder bed fusion in an atmosphere comprising from >0 to 2 mol % oxygen or by activating the powder mixture by heating it in an atmosphere comprising >0 to 2 mol % oxygen and then powder bed fusing in an inert atmosphere. The second powder can comprise particles of cerium, tungsten, tantalum, hafnium, manganese, thorium, calcium, aluminium, zirconium and/or yttrium or alloys thereof. The article can be a bushing for glass fibre production or a space thruster nozzle. The process can also be used to make carbide, silicide and nitride dispersion strengthened alloys.