Top ten materials that receive the most attention
Posted by beauty33 on April 26th, 2021
Porous ceramics (honeycomb ceramics)
Porous ceramic material is a kind of material with open pore size and high opening porosity, which is prepared by molding and special high temperature sintering process with high quality raw materials such as corundum sand, silicon carbide and cordierite as main materials. It has the advantages of high temperature resistance, high pressure, acid resistance, alkali resistance and organic medium corrosion, good biological inertness, controllable pore structure, high opening porosity, long service life and good product regeneration performance. It is suitable for the precise filtration and separation of various media, high-pressure gas exhaust mute, gas distribution and electrolytic diaphragm.
AlN is an atomic crystal, which belongs to diamond-like nitride, and can be stabilized up to 2200°C. The room temperature strength is high, and the strength decreases slowly with the increase of temperature. It has good thermal conductivity and small thermal expansion coefficient, making it a good thermal shock material. It has strong resistance to molten metal corrosion and is an ideal crucible material for melting and casting pure iron, aluminum or aluminum alloy. Aluminum nitride is also an electrical insulator with good dielectric properties, and it is also promising as an electrical component. The aluminum nitride coating on the surface of gallium arsenide can protect it from ion implantation during annealing.
Graphene is currently the thinnest and hardest nanomaterial in the world, with a thickness of only 0.335 nm, equivalent to one in 200,000 of hair, and a hardness 200 times that of steel of the same specification, which is affectionately called "black gold" by materialists. Scientifically speaking, graphene is a monolayer two-dimensional crystal composed of carbon atoms arranged in SP2 hybrid orbitals according to the honeycomb lattice, with excellent properties such as strong conductivity, ultra-strong hardness and toughness, specific thermal conductivity and high light transmittance.
Fluorite is a common mineral in nature, which can symbiosis with a variety of other minerals, and is produced in many places in the world, with five effective varieties. It is not often used as a gemstone because of its brittle and soft nature. In industry, fluorite is the main source of fluorine, which can extract and prepare fluorine elements and their various compounds. Fluorite specimens with colorful color and beautiful crystal morphology can be used for collection, decoration and carving crafts.
Natural zirconia mineral materials mainly include zircon and zirconite. The deep layer minerals of zirconitic igneous rocks are yellowish, brownish-yellow and yellow-green in color, with specific gravity of 4.6-4.7 and hardness of 7.5. They have strong metallic luster and can be used as raw materials for ceramic glaze.
Lithium Iron Phosphate
Lithium iron phosphate is a new type of electrode material for lithium ion batteries. It is characterized by its large discharge capacity, low price, non-toxicity, and no environmental pollution. Countries around the world are competing to achieve industrialized production.
It generally refers to low-temperature quartz (α-quartz), which is one of the most widely distributed minerals in quartz minerals. Generalized quartz also includes high-temperature quartz (β-quartz), cordierite and so on. The main component is SiO2, which is colorless and transparent and often contains a small amount of impurity components, while it becomes translucent or opaque crystals with a hard texture. Quartz is a kind of mineral resource with very stable physical and chemical properties, and the crystal belongs to the oxide mineral of tripartite crystal system. Quartz block, also known as silica, is mainly the raw material for the production of quartz sand (also known as silica sand), but also the raw material for quartz refractory materials and fired silica iron.
Calcium carbonate is an inorganic compound, commonly known as apatite, limestone, stone powder, marble and so on. Calcium carbonate is neutral, practically insoluble in water and soluble in hydrochloric acid. It is one of the common substances on Earth, existing in shrapnel, calcite, chalky, limestone, marble, lime bloom and other rocks, but also the main component of animal bones or shells. Calcium carbonate is also an important building material and is widely used in industry.
It is a high-hardness compound with a melting point of 2054°C and a boiling point of 2980°C. It is an ionic crystal that can be ionized at high temperatures and is often used in the manufacture of refractory materials.
Silicon carbide has many other uses in addition to abrasive due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient and good wear resistance. For example, coating silicon carbide powder on the inner wall of turbine impeller or cylinder body by special process can improve its wear resistance and prolong its service life by 1 ~ 2 times; the advanced refractory materials made are resistant to thermal shock, small size, light weight and high strength, and have good energy-saving effect. Low grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer, which can accelerate steelmaking speed, facilitate the control of chemical composition and improve the quality of steel. In addition, silicon carbide is also widely used to fabricate silicon carbon rods for electrical heating elements.
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Joined: July 10th, 2017
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