Basic classification of non-ferrous metals
Copper in non-ferrous metals is one of the earliest metal materials used by humans. Modern non-ferrous metals and their alloys have become indispensable structural and functional materials in the fields of machinery manufacturing, construction, electronics, aerospace, and nuclear energy utilization. In practical applications, non-ferrous metals are usually divided into 5 categories: light metals have a density of less than 4500kg/m3 (0.53~4.5g/cm3), such as aluminum, magnesium, potassium, sodium, calcium, strontium, barium, etc. The density of heavy metals is greater than 4500kg/m3 (4.5g/cm3), such as copper, nickel, cobalt, lead, zinc, tin, antimony, bismuth, cadmium, mercury, etc. Precious metals are more expensive than commonly used metals, low crustal abundance, difficult to purify, and chemically stable, such as gold, silver and platinum group metals. Semi-metallic properties are between metals and non-metals, such as silicon, selenium, tellurium, arsenic, boron, etc. Rare metals include rare light metals, such as lithium, rubidium, cesium, etc.; rare refractory metals, such as titanium, zirconium, molybdenum, tungsten, etc.; rare dispersed metals, such as gallium, indium, germanium, etc.; rare earth metals, such as scandium, yttrium, and lanthanide Series metals; radioactive metals, such as radium, francium, polonium, and uranium and thorium in the series elements.
2018/12/28
Introduction of Nonferrous Metal Materials
Non-ferrous metals refer to all metals except iron, chromium and manganese. In 1958, China included iron, chromium and manganese in ferrous metals, and 64 metals other than iron, chromium and manganese were included in non-ferrous metals. The 64 non-ferrous metals include: aluminum, magnesium, potassium, sodium, calcium, strontium, barium, copper, lead, zinc, tin, cobalt, nickel, antimony, mercury, cadmium, bismuth, gold, silver, platinum, ruthenium, rhodium, palladium, osmium, iridium, Beryllium, lithium, rubidium, cesium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, tungsten, molybdenum, gallium, indium, thallium, germanium, rhenium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, yttrium, thorium.
2018/12/28