Pt90Pt10Ir

Pt90Pt10Ir is a platinum–iridium alloy consisting of approximately 90 atomic percent platinum and 10 atomic percent iridium. It belongs to the family of Pt–Ir alloys known for high melting points, exceptional corrosion resistance, and good mechanical strength. In the platinum–iridium system, iridium atoms substitute into the platinum lattice, forming a largely single-phase alloy with a face-centered cubic structure.

The alloy exhibits higher hardness and wear resistance than pure platinum, with maintained ductility and excellent creep resistance at elevated temperatures. It also offers superior resistance to oxidation and chemical attack relative to many other metals, while retaining the overall corrosion resistance characteristic of platinum-group metals. The high density typical of Pt–Ir alloys remains a defining feature.

Manufacturing involves melting and alloying platinum with iridium under controlled atmospheres (often vacuum or inert) and subsequent casting or deformation processing, such as forging, rolling, or powder metallurgy, followed by homogenizing heat treatments to ensure a uniform composition.

Applications span high-end jewelry and precision components where durability and appearance are important, as well as electrical contacts, laboratory equipment, and certain high-temperature or chemically aggressive environments. Pt–Ir alloys are also employed in specialized electrodes and catalytic applications where stable performance under harsh conditions is required.

Notes: the designation Pt90Pt10Ir indicates a composition of about 90% Pt and 10% Ir, and exact properties can vary with processing history and microstructure.