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General Situation Of Pure Metals

Sep 15, 2018

Although pure metal has the advantages of high conductivity, heat conductivity and good plasticity, it can not meet the requirements of various occasions because of its limitations. The mechanical properties of pure metals are not high. For example, the strength of pure metals is generally low, the tensile strength of iron is about 200 MPa, and the tensile strength of pure aluminum is about 100 MPa. It is obviously not suitable for engineering materials of various structures. In addition, due to the limited variety of pure metals, difficult preparation and relatively high price, it is less used in various industries. In fact, the metal materials used in the project are alloys, such as carbon steel, alloy steel, cast iron, copper alloy, neodymium alloy, especially iron, carbon as the main component of the alloy.

Copper: Pure copper, also known as copper, density is 8.94 g/cm 3, melting point is 1083 degrees, non-magnetic. It has good conductivity, thermal conductivity and corrosion resistance, but also has a high chemical stability. (Copper compounds are toxic.) Lead: lead, also known as blue-gray appearance. Lead strength and hardness is very low, can be cut off, processing at room temperature will not produce. The density is 11.34 g/cm3 and is often used to make warheads because of its high density. Lead has a high resistance, poor thermal conductivity, and a melting point of 327 degrees. It is often used to make fuses. Nickel: Nickel is a silver-white metal, after polishing can maintain a long-term beautiful luster, density of 8.9 g/cm 3, melting point of 1455 degrees, in the temperature below 360 degrees magnetic. Nickel has good electrical vacuum performance, volatilization in high temperature and vacuum is very small, is an important material for electrical vacuum instruments. White metal, due to the influence of impurities, slightly blue, more impurities, blue deeper. Pure antimony is also known as star antimony. Brittle, non-ductile, so not used alone, the density of antimony is 6.7 g/cm 3, the melting point is 630 degrees, solidification slightly expanded, therefore, antimony is mainly used with lead and tin alloy. Zinc: zinc is a white slightly bluish luster metal. It is very brittle at room temperature, but when heated to 100-150 degrees, it becomes tough and easy to work under pressure. When the temperature rises to 200 degrees, it becomes brittle and can be broken into powder. Mercury: mercury is also called mercury, silver white. The melting point is - 38.87 degrees, liquid at room temperature. The density is 13.5g/cm3, the heaviest liquid at room temperature. Mercury is not easily oxidized and corroded. It is widely used in barometer thermometers and other testing instruments. Bismuth: Bismuth has a white or pink surface with a density of 9.8g/cm3 and a melting point of 277 degrees. It is mainly used to make low melting point alloys, medicines and chemical reagents. Titanium: Titanium is a light metal with a density of 4.5g/cm3. Its melting point is higher than that of iron and nickel. Titanium is a silver-white metal. The surface of cobalt is dark gray with a density of 4.5g/cm3. Cadmium: Cadmium is grey, density is 8.65g/cm3, melting point is 321 degrees. Mainly used for electroplating battery, etc. Aluminum: Aluminum is a silver-white metal with a face-centered cubic lattice and no isomeric transformation, with a density of 2.7g/cm 3 and a melting point of 660 degrees.