The melting points and densities of the so-called Noble Metals, coupled with their resistance to chemical attack, sets them apart from most other materials. Edited by Jean M. Hoffman Unless you work with precious metal (PM) frequently, your knowledge of these metals is probably limited. The 15-min discussion devoted to PMs in college materials-science classes likely did not do justice to the engineering value for these eight elements. If you did not know there were eight (No, titanium is not one of them.), read on to find out what your professor probably did not know either. A precious metal is a rare metallic element of high economic value. PMs are also referred to as Noble Metals because they resist most types of environmental and chemical attack. One of the few chemical solutions that attacks them (with the exception of iridium) is aqua regia. Only copper and PMs are found in nature in their metallic state. All other metals are processed from minerals or ores into metals which are inherently unstable and have a tendency to revert to their more stable mineral forms. PMs, as a group, have a set of physical and chemical properties that are unrivaled by many other materials. If PMs were more available (in both quantitative and economic terms), there would be far more applications overall. Though typical applications use only small amounts, PMs may be used in large quantities when there is no feasible substitute. The eight PMs gold (Au), silver (Ag), platinum (Pt), iridium (Ir), palladium (Pd), rhodium (Rh), ruthenium (Ru), and osmium (Os) are conveniently grouped together in the periodic table. A subset of this group is called the Platinum Group Metals (PGM), which includes all but Au and Ag. Typically the PGMs are found combined together in rich ore. Chemical processing extracts
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Precious Metals and Alloys
Precious metals and precious alloys are rare metallic elements and alloys such as silver, gold, platinum, palladium, iridium, osmium, rhodium, and ruthenium. They posses unique characteristics that set them apart from other metals.
Catalysts and Initiators
Catalysts and initiators start or promote chemical reactions used to produce organic chemicals, polymers and adhesives.
Electrodes and Electrode Materials
Electrodes and electrode materials are metals and other substances used as the makeup of electrical components. They are used to make contact with a nonmetallic part of a circuit, and are the materials in a system through which an electrical current is transferred.
Specialty Nonferrous Metals and Alloys
Specialty nonferrous metals and alloys include metals such as hafnium, zirconium, beryllium, tantalum or osmium with unique properties for specific applications.
Topics of Interest
For a material scientist, precious metals are those elements that, independent of their aggregate state, are stable in air and do not corrode. These are ruthenium (Ru), gold (Au), platinum (Pt),...
Precious metals may seem unlikely as engineering materials, but the same expensive metals used for coinage and jewelry also satisfy applications requiring the ultimate in corrosion resistance or...
7.8 Precious Metals
Recycling of precious group metals, which include, silver, gold, and platinum group metals ( PGMs) - platinum, palladium and rhodium is largely undertaken by separate specialist...
This chapter covers the specific interfaces of these important areas with planning for the overall success of maintenance. Appendix A describes the concepts and importance of preventive maintenance,...
Point 1: Selecting Non-Ferrous Alloys for Various Applications
Point 2: Metallurgical Parameters Governing the Properties of Metals and Alloys
Mrs Kiran Verma
Various types of non-ferrous...