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Download as PDF; Printable version; In other projects ... iridium: 6.5: 1760–2200: 1670: 2120 78: Pt: ... Mohs hardness of materials (data page) ...
Because of its hardness, brittleness, and very high melting point, solid iridium is difficult to machine, form, or work; thus powder metallurgy is commonly employed instead. [12] It is the only metal to maintain good mechanical properties in air at temperatures above 1,600 °C (2,910 °F). [ 13 ]
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Platinum–iridium alloys are alloys of the platinum group precious metals platinum and iridium. Typical alloy proportions are 90:10 or 70:30 (Pt:Ir). These have the chemical stability of platinum, but increased hardness. The Vickers hardness of pure platinum is 56 HV while platinum with 50% of iridium can reach over 500 HV.
Osmiridium is a naturally occurring alloy of iridium and osmium found in platinum-bearing river sands in the Ural Mountains and in North and South America. Trace amounts of osmium also exist in nickel-bearing ores found in the Sudbury , Ontario , region along with other platinum group metals.
Print/export Download as PDF; Printable version; In other projects Wikidata item; ... 77 Ir iridium; use: 41.12 CRC: 41.12 LNG: 41.12 WEL: 26 78 Pt platinum; use:
Mortgage rates are holding steady as of Tuesday, February 11, 2025, pushing the 30-year fixed benchmark under 7.00% ahead of fresh consumer and wholesale inflation data this week.
A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .