Platinum Metals Review - Volume 23, Issue 4, 1979

The emissions produced by gas turbine engines driven by catalytic combustion can contain significantly lower levels of noxious gases than those exhausted from conventional flame fired engines. The research reported here has demonstrated that efficient power generation, combined with minimum noxious emission, can be achieved by utilising metal supported platinum catalyst combustion systems specifically designed to ensure maximum compatibility with the engine models they are to power. A number of important applications for these systems are suggested.

Until recently the brittleness of chromium and its alloys has limited their use in applications which require a high resistance to corrosion in oxidising environments. Now, minor additions of selected metals can produce alloys with satisfactory low temperature ductility and workability, but even these alloys are susceptible to corrosion in non-oxidising environments. Passivation and corrosion resistance in such conditions can be increased by cathodic additions of noble metals; this paper reports a study of the effects of such additions on the corrosion and electrochemical behaviour of ductile chromium alloys in non-oxidising environments.

The resistive properties of three rhodium-platinum alloys have been measured in the temperature range 2 to 300 K. Resistors of high stability and low temperature coefficient of resistance at liquid helium temperatures have been made with these rhodium-platinum alloys.