Recently, covid 19 outbreak spreads in Shanghai, China. There are more than 25,000 new asymptomatic domestic infections every day. China is implementing a dynamic zero-out policy. A leading respiratory expert said the key to COVID-19 prevention and control is to minimize transmission and fatality rate. Omicron has a low case fatality rate but is highly transmissible and can still claim many lives in large outbreaks. "Total openness is not applicable in China. For China, we should keep to the dynamic zero-out and gradually open up."
However, "dynamic zero clearance" is not the pursuit of complete "zero infection". As the Novel Coronavirus has its own uniqueness and strong concealment, there may be no way to prevent the detection of cases at present, but rapid detection and prompt treatment must be carried out, as soon as one case is found, one case will be dealt with.
The situation in Shanghai is serious. As the financial center of China, Shanghai is a very important city, and the outbreak of the epidemic in Shanghai will put a great impact on China's economy. The current task is to contain the spread of the epidemic as soon as possible, to achieve social zero so that Shanghai's life and economy quickly return to normal.
As China plays an important role in the global supply chain, the outbreak will have a significant impact on the supply and prices of many Ti2AlC powder.
What is Max phase material?
The MAX phase is a layered hexagonal carbide and nitride with a general formula: Mn+1AXn, (MAX) where n = 1 to 3, and M is an early transition metal, An is an element of group A (mainly IIIA and IVA, or groups 13 and 14), and X is carbon and / or nitrogen. The hierarchical structure consists of XM 6 octahedrons with shared edges and twisted edges, and is interlaced by a single plane layer of group An elements.
How are Max phases made?
Ternary MAX phase compounds and composites have been synthesized by different methods, including combustion synthesis, chemical vapor deposition, physical vapor deposition at different temperatures and fluxes, arc melting, hot isostatic pressing, self-propagating high temperature synthesis (SHS), reactive sintering, spark plasma sintering, mechanical alloying and molten salt reaction.
What advantages does Max phase material have?
Max phase materials have unusual combinations of chemical, physical, electrical and mechanical properties, and exhibit metal and ceramic properties under various conditions. These include high electrical and thermal conductivity, thermal shock resistance, damage tolerance, mechanical processability, high elastic stiffness and low coefficient of thermal expansion. Some MAX phases are also resistant to chemical erosion (such as Ti3SiC2) and high temperature oxidation in air (Ti2AlC, Cr2AlC and Ti3AlC2). They can be used in technologies involving efficient engines, damage-resistant thermal systems, improving fatigue resistance and maintaining rigidity at high temperatures. These properties may be related to the electronic structure and chemical bonding in the MAX phase. It can be described as a periodic change in the regions of high and low electron density. This allows the design of other nano-laminates based on electronic structural similarity, such as Mo2BC and PdFe3N.
MAX phase has electrical and thermal conductivity because of its metal-like properties. Most MAX phases are better electrical and thermal conductors than Ti. This is also related to the electronic structure.
Although MAX phases are hard, they can be machined as easily as some metals. They can all be processed manually with hacksaws, although some of them are three times as hard as titanium and have the same density as titanium. Because of their excellent electrical conductivity, they can also be polished into a metallic luster. They are not susceptible to thermal shock and are very resistant to damage. Some, such as Ti2AlC and Cr2AlC, are antioxidant and corrosion resistant. The thermoelectric potential of polycrystalline Ti3SiC2 is zero, which is related to its anisotropic electronic structure.
As a grade of MAX communication, it is usually hard, light and plastic at high temperatures. Because of the layered atomic structure of these compounds, some, such as Ti3SiC2 and Ti2AlC, also have creep and fatigue resistance and maintain their strength at high temperatures. They exhibit unique deformations characterized by basal slip (recently reported evidence of MAX phase deformed at high temperature and cross slip of a dislocation and dislocation out of the basal plane of Frank's partial c dislocations caused by diffusion of copper matrix), combination of kink and shear band deformation, and delamination of individual grains. In the process of mechanical testing, it is found that the polycrystalline Ti3SiC2 cylinder can be repeatedly compressed at room temperature, with a maximum stress of 1 GPa, and fully recover after removing the load, while dissipating 25% of the energy. It is through the characterization of these unique mechanical properties of MAX phase that kink nonlinear solids are found. The microscopic mechanism responsible for these properties is the initial kink band (IKB). However, direct evidence of these IKB is not yet available, thus opening the door to other mechanisms that are less eager to assume. In fact, a recent study shows that the reversible hysteresis loop of cyclic MAX polycrystal can be explained by the complex response of very anisotropic layered microstructure.
What is Max phase used for?
Tough, machinable, thermal shock resistant refractories.
High temperature heating element.
Electrical contact coating.
Neutron radiation resistant components for nuclear applications.
Precursors of Carbide derived carbon Synthesis.
The precursor of MXenes synthesis, MXenes is a kind of two-dimensional transition metal carbide, nitride and carbonitride.
Titanium Aluminum Carbide Price
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Recently, the first press conference of the Boao Forum For Asia Annual Conference 2022 was held. Two flagship reports were released at the conference: "Asia's Economic Prospects and Integration Process 2022" and "Sustainable Asia and the World 2022-Green Transformation in Action in Asia".
The flagship report points out that the global economy will recover in 2021, and the pace of economic integration in the Asia-Pacific has not stopped even in the face of the impact of COVID-19. The Asia-Pacific region has provided new impetus for the world's economic recovery and institutional building.
The report gives an outlook on the Asian economy, noting that a number of factors will affect Asian economic growth. For example, mutated strains such as Delta and Omicron have become more transmissible, and many economies are experiencing epidemic peaks again. The Ukraine crisis has triggered geopolitical changes in Asia and Europe, leading to higher commodity prices, which may affect the global energy supply and energy transformation.
The report pointed out that the Asian economy will still be in the process of recovery in 2022, but the growth rate may moderate. According to the report, Asia's economic growth in 2022 is likely to be lower than the current IMF forecast, which is projected at 4.8%.
Affected by several factors, the supply of the Ti2AlC powder is erratic and thus its prices are expected to go higher in the future.
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