MAX phase ceramics (including Ti3AlC2, Ti3AlC2, etc.) are a new type of machinable conductive ceramic materials that have attracted much attention. Such ceramics contain more than sixty ternary carbides or nitrides. M represents the front metal element of the transition group; A represents the main group element, mainly the elements of the third main group and the fourth main group; X represents carbon or nitrogen element. Among them, Ti3AlC2 is the most widely studied. Ti3AlC2 was successfully synthesized by hot pressing method in 1996 by Prof. Barsoum M's research group at Drexel University in the United States, and its excellent properties were found.
Technical parameters of tungsten disulfide
Titanium Aluminum Carbide
Characteristics of titanium aluminum carbide
Titanium aluminum carbide (Ti3AlC2) belongs to the hexagonal crystal system, and has the characteristics of metal and ceramics: it not only has the same electrical and thermal conductivity as metal, but also has high elastic modulus and excellent high temperature mechanical properties similar to ceramics. Electrical and thermal conductivity, high elastic modulus and low Vickers hardness, good damage resistance; can be machined at room temperature, can produce plastic deformation at high temperature; it also has good high temperature stability and oxidation resistance. It also has good thermal shock resistance, damage resistance and excellent chemical resistance.
Due to the unique nano-layered crystal structure, this type of ceramic material has the properties of anti-oxidation, self-lubricating, high fracture toughness at room temperature, and electrical conductivity. Such materials can be widely used as high-temperature structural materials, electrode brush materials, chemical anti-corrosion materials and high-temperature heating elements. Products are mainly used in high temperature coatings, MXene precursors, conductive self-lubricating ceramics, lithium-ion batteries, supercapacitors, and electrochemical catalysis.
Application of titanium aluminum carbide
One of a series of ternary layered carbides of titanium aluminum carbide (Ti3AlC2). It has high strength and elastic modulus, high thermal conductivity and electrical conductivity, and good processability.
Traditional ceramics are limited by the disadvantages of high brittleness, brittleness, low impact resistance, and difficult processing, and are difficult to be widely used. The new Ti3AlC2 ceramics just makes up for this vacancy. It combines the properties of ceramics and metals: existing metals Good electrical conductivity, high thermal conductivity, machinability, thermal shock resistance, high temperature plasticity and high temperature strength, etc., and good corrosion resistance, high modulus, low friction coefficient and self-lubricating properties of ceramic materials. In addition, Ti3AlC2 also has a lower density, which meets the development requirements of the lightweight era.
MAX phase material application field
In view of the many excellent properties of the MAX phase, it can be widely used in the following material fields;
(1) Corrosion-resistant materials.
Corrosion is one of the main culprits of material loss and scrap, and corrosion failure caused by corrosion has brought great economic losses to people, and may even endanger people's lives. As a new era of corrosion-resistant materials, MAX phase has high surface hardness after carbonization and calcination. In theory, it can form an excellent corrosion-resistant protective layer with excellent corrosion resistance. Moreover, this surface treatment process is quite inexpensive and easy to operate. In addition, the density of MAX phase materials is much lower than that of the most widely used steel materials, and it can withstand a certain impact force. Therefore, when partially replacing steel components, it can not only meet the needs of the era of lightweight, but also meet the traditional needs of anti-corrosion , especially in the marine industry and ship transportation where the corrosive environment is harsh, it has more potential, such as replacing some filters and seals that need anti-corrosion treatment.
(2) High temperature structural materials.
At present, the hardness of nickel alloy, which is a better high-temperature structural material, is only half of that of MAX phase material. When the temperature exceeds 1200 °C, Ti3AlC2 can maintain good strength, but Ni-based alloys begin to fail transition, which shows the high temperature stability of MAX phase. Stronger than Ni-based alloys. In addition, the excellent processing performance of MAX phase can fully meet the requirements of high-temperature structural materials. It is an ideal candidate material for preparing high-temperature components such as guide vanes, turbine blades, high-pressure compressor discs, turbine discs and combustion chambers of gas engines.
(3) Low friction coefficient materials and electrical contact materials.
The large size and high orientation of the MAX phase crystal, coupled with its self-lubricating properties, make the MAX phase have excellent potential for the development of extremely low friction coefficient materials. Due to the functional characteristics of current transmission and conversion, electrical contact materials require candidate materials with good thermal and electrical conductivity, high strength, high temperature stability, excellent self-lubrication and low friction coefficient. MAX phase materials meet these finicky requirements.
(4) Materials of rotating parts.
The processability, dimensional stability, low density and high stiffness of the MAX phase are the chips for its selection as a candidate material for rotating parts, which has great application potential in the field of disk drive equipment that requires high dimensional stability during rotation.
(5) Heat exchange material.
Excellent thermal conductivity is one of the characteristics of the MAX phase, and its good thermal conductivity can continue to be maintained at high temperatures. Combining its other characteristics, such as easy machining, stable chemical properties, especially excellent thermal shock resistance, makes MAX Phase materials become one of the candidates for a new generation of heat exchange materials.
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