The US Commerce Secretary has announced that the US will temporarily lift tariffs imposed on Ukraine during the Trump administration to help Ukraine recover its economy and continue to show support for the Russia-Ukraine situation. "For steel mills to remain an economic lifeline for the Ukrainian people, they must be able to export steel," the Commerce Department said in a statement.
The Biden administration will announce the lifting of steel tariffs on Ukraine for one year. Ukraine is a fairly small supplier of U.S. steel, shipping about 218,000 tons in 2019, ranking it 12th among foreign suppliers to the United States, the report said. The U.S. Commerce Department noted that the steel industry is uniquely important to Ukraine's economic strength, with one in 13 people employed in the steel industry.
Affected by the ever-changing international situation, the supply and prices of international bulk titanium carbide powder are still very uncertain.
We use steel to build houses, parks, and playgrounds. If steel no longer exists, or if we have to build cities on Mars, what materials can replace steel?
Glass Fiber Reinforced Plastics (FRP)
It was first heard in 1940. Fiberglass has no steel in it, but it is very hard: An 8mm thick glass plate cannot be penetrated by a speeding bullet.
To make fiberglass, glass is first melted and drawn into wires. Glass fiber is very elastic and can be spun into cloth. Fiberglass or glass-reinforced plastics are made by pressing layers of glass cloth together and adding heat treatment to a hot-melt plastic.
The mechanical strength of fiberglass is comparable to that of steel, but it weighs only a quarter of that of steel, so it's very light. Moreover, fiberglass does not rust, and does not conduct electricity.
Glass fiber reinforced plastics (FRP) is a new technological material, which is light, beautiful, and strong, and can be used to make car bodies, motorboat hulls, railway carriages, construction materials, etc. The body of a car made of fiberglass weighs just over 150 kilograms. Fiberglass powerboats don't rust and rot, and they can be made into one piece without splicing. If the body of the boat breaks somewhere, just put some adhesive resin around it and put pieces of glass cloth on it.
The use of FRP is more and more extensive. In the military, FRP is used to make light tanks and gunboats, and in sports, FRP is used to make pole vaulting poles and bows for archery. In life, FRP is also used to manufacture furniture and kitchen bath equipment, such as bathtubs, sinks, which are beautiful, light, strong, and durable.
Iron and steel materials have many advantages, but it also has many defects, such as not corrosion resistance, not high-temperature resistance, not being hard enough, and heat insulation. Ceramics make up for these defects.
We all know that ceramics are fragile. After analyzing the composition of ordinary ceramics, scientists believe that one of its main materials, clay containing more impurities, is the source of ordinary ceramics' easy cracking. So, a silver-gray silicon nitride ceramic was made by mixing sand, starch, and zirconia in a nitrogen-filled furnace at 1,400 °C for seven hours.
This colorful high-tech ceramic, with almost the same specific weight as aluminum, can withstand high temperatures of more than 1500℃, and has very good toughness, and amazing hardness, only diamond can cut it. Since then, silicon carbide, zirconia, titanium carbide, toughened alumina, and other new ceramic materials have come out.
Different high-tech ceramics with different compositions have their own use.
Zirconia ceramics, for example, are particularly resistant to wear, corrosion, and high temperatures. Engine cylinders made of zirconia do not need a cooling system so that the heat generated by fuel combustion in the cylinder can be converted into the power required by the car to the maximum. In addition, the new cylinder is hard, not easy to wear, and the acid gas is formed by the decomposition of fuel oil corrosion. Therefore, this high-tech ceramic automobile engine has a long service life, high power, low manufacturing cost, and can save a lot of metal materials and 30% of the fuel consumption.
More interesting is that the cutting tool is made of high-tech zirconium-containing ceramics, once the knife body is impacted by external forces and cracks, it will automatically expand, and the cracks will be closed. Zirconia ceramic scissors, the blade is not blunt, rust not crack, known as never scrap "long life scissors".
The development of high and new technology can make ceramic become harder than iron and steel, and also can make it as ductile and plastic as copper, aluminum, and other non-ferrous metals. Titanium oxide ceramics, for example, are ground into extremely fine grains and, with a binder, melted into sheets at high temperatures. Simply heat the sheet to 1809°C and crush it. The result is a wavy ceramic plate. Another calcium fluoride ceramic, even when heated to 80℃, takes on the characteristics of extrusion deformation.
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The United States urges the U.N. Security Council to impose additional sanctions on North Korea in response to its latest ballistic missile launch, including a ban on tobacco and oil exports to North Korea and a blacklist of the Lazarus hacking group.
The United States circulated the draft to the 15 members of the Security Council this week. It was not immediately clear if or when a vote would take place. A resolution requires nine "yes" votes and no vetoes from Russia, China, France, Britain, or the United States.
Russia and China have already voiced opposition to tightening sanctions in response to Pyongyang's launch of an intercontinental ballistic missile last month -- the first since 2017.
U.S. and South Korean officials and analysts also say there are growing indications that North Korea may soon conduct its first nuclear weapons test since 2017, too.
The U.S. -drafted U.N. resolution would expand the ban on ballistic missile launches to include cruise missiles or "any other delivery system capable of delivering a nuclear weapon."
The deal would halve crude oil exports to North Korea to 2 million barrels a year and refined oil exports to 250,000 barrels a year. The resolution also seeks to ban North Korea's export of "fossil fuels, mineral oils, and their distilled titanium carbide powder are estimated to be influenced by international political situation changes.
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