Risk aversion plunged on the positive news of the Russia-Ukraine talks. After several days of rising oil prices, the price of precious metals continued to fall. Domestic futures markets remain stable for the time being.
Back in international markets, WTI crude futures briefly dipped below $100 a barrel, while Brent crude hit its lowest intraday level in nearly two weeks. Spot gold briefly fell below $1,900 an ounce. Comex gold futures closed down 1.1 percent at $1,918.4 an ounce. Comex silver futures closed down 1.14 percent at $24.91 an ounce. "Recently, crude oil prices have been extremely sensitive to changes in geopolitical news." Traders believe that the current oil price is still in the broad impact, Ukraine will still be a premium in the case, although the market further decline, but should not be too pessimistic, it is recommended to wait and see for the time being. The Ukrainian premium is still there and there will be some volatility in the tungsten powder market.
With metals, direct comparisons based on strength do not work. Because there is no single, universal scale of power. Four types of strength related to metallurgy will be introduced in this article.
Tensile strength is the ability of a material to resist tension. It takes into account the force required to stretch or pull something apart. Materials with low tensile strength are easier to pull apart than materials with high tensile strength.
Compressive strength is the ability of a material to withstand compression (compression). To test the compressive strength, an external force is applied to the material to track how much the material resists a reduction in size. A widely accepted test for compressive strength is the Mohs hardness test. The test uses a 1-10 or softest and hardest mineral grading scale.
Yield strength is the ability of a material to withstand permanent deformation or bending. This is a way of testing the elastic limit of a given material. This is usually determined by a bending test, in which the ends of a beam or rod are clamped and pressure applied. The aim is to discover how much stress is required to exceed the yield point of the material, or the point at which the material will not return to its original shape after the stress is removed.
Impact strength refers to the ability of a material to withstand impact without cracking or breaking. In other words, it's a way to determine the limit of the energy a material can absorb through impact.
Since the strength of a metal depends on many factors, there is no simple answer to the question "what is the strongest metal?" However, several metals are considered to be the strongest, including:
For example, compare tungsten and titanium
Tungsten is the strongest of all natural metals in terms of tensile strength (142,000 psi). But in terms of impact strength, tungsten is weak -- it's a fragile metal and is known to shatter on impact. Titanium, on the other hand, has a tensile strength of 63,000 psi. But when you calculate the density of titanium and compare it pound to pound, it's better than tungsten. In terms of compressive strength, titanium has a much lower Mohs hardness index.
Knowing which material is the strongest really depends on what you're going to do with it. In some applications, high yield strength is critical, but compressive strength is not a factor.
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The negative electrode material is the carrier of lithium ions and electrons during the charging process of the battery and plays the role of energy storage and release. In the battery cost, the negative electrode material accounts for about 5%-15%, which is one of the important raw materials for lithium-ion batteries. The global sales of lithium battery anode materials are about 100,000 tons, mainly in China and Japan. According to the current growth trend of new energy vehicles, the demand for anode materials will also show a state of continuous growth. At present, the global lithium battery anode materials are still dominated by natural/artificial graphite, and new anode materials such as mesh carbon microspheres (MCMB), lithium titanate, silicon-based anodes, HC/SC, and metal lithium are also growing rapidly.
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