Copper was used for so long because it is relatively easy to mine and extract from its ore. When it is pure, copper is a soft, red metal, however it can be hardened if other metals are mixed to it. This product is then called an alloy. The most well known copper alloys are bronze, which is made from copper and tin and brass made from copper and zinc (1). Copper alloys like these two, were discovered much later than the pure form of copper.
The process is used with shielding gas and without the application of pressure. The shielding gas that usually used were argon and helium. The process may be used with or without the addition of filler metal. GTAW has become indispensable as a tool for many industries because of the high-quality welds produced and low equipment costs. The GTAW process can be used to weld steel, stainless steel, Al, Mg, Cu, Ni, Ti, and others.
Its oxidation durability level is between 450-1000 °C, which makes it preferred material to be used in scissors. Stainless steel is extremely durable against corrosion, which is the physical, chemical and mechanical change due to chemical and electrochemical reactions in an
The arce method is the method for making C60 fullerenes, this method is one of the most easiest and also most common method. The arce method creates carbon nanotubes through arc-vaporization of two carbon rods placed end to end, separated by approximately 1mm, in an enclosure that is usually filled with inert gas usually helium or argon at low pressure. Although this method is common and the eastist. The method is also great to get small and high-quality of carbon nanotubes. The arce method does have some drawbacks, The fact that it is hard to up scale the method and also the carbon nanotubes are grown in highly tangled forms.
Anthracite Anthracite is the highest rank of coal. It has a carbon content of over 87% on a dry ash free basis. Anthracite coal usually has the highest heating value per ton on a mineral matter free basis. It is often subdivided into semi anthracite, anthracite, and meta-anthracite on the basis of carbon content in the coal. Anthracite is frequently referred to as "hard coal"; however, this is a layman's term and has little to do with the hardness of the
While carrying out Friction stir welding on two dissimilar metals the conductivity increases and corrosion reduces. However in stir welding the metal can’t be welded again . Even though Aluminum is heated to 359°C and copper was done at 560°C but these two dissimilar metals give very good welding strength. The weld pieces are subjected to compression test and it is proved the welding strength is good. The metals are welded at an r.p.m of at 1500 .
FACT : It is the most abundant metal on Earth’s crust. It has remarkably low density and can resist corrosion by passivation due to which aluminium and its alloys are of great use in the aerospace industries. It shows amphoteric nature and is also used in chromatography as adsorbent. It has low melting point and does not exhibit allotropy. It is known to be a non-magnetic metal which serves as a good reflector and conductor of heat and electricity.
This causes the level of hydrogen to increase which will then be accumulated to the steel itself causing hydrogen embrittlement which is also known as the diffusion of hydrogen in the steel making it light and brittle. • As good as the pickling is to the metal it is as bad as the effects it has on the environment. Proper ventilation, mist discharge, sewage are all environmental effects. • For sulphuric acid the “not-pickled” metal needs few cracks on the scale layer covering the base metal so that the sulphuric acid can be entered beneath the scale to loosen the bond between the scale and the base metal. However sulphuric acid can be diffused against the base metal Other acids that can be used is Hydrochloric acid as an
Concrete has many advantages, such as high compressive strength, ability to cast in almost any desired shape, economical and fire resistance. Yet, there are some disadvantages, like low tensile strength, low ductility and cracking. Regardless those disadvantages, concrete is still one of the chosen materials in construction. Reinforced concrete (RC) is a very complex composite material resulting from a combination of two materials, concrete and steel, both of which have entirely different mechanical properties. Steel can be considered a homogeneous material and its tensile strength and ductility are very high.
Most of carbon fiber reinforced plastics have comparatively simple shapes such as plates and curved shells, and it is not easy to manufacture three-dimensional mechanical parts. A 3D printing process of carbon fiber reinforced plastics enables a flexible manufacturing system, and the strength of mechanical parts is increased by inclusion of carbon fibers. In the present study, a dieless forming process of carbon fiber reinforced plastic parts using 3D printer was developed to manufacture three-dimensional mechanical