Following the progress in Russia-Ukraine peace talks, the gold price fell more than 1% the next day, hitting its lowest in a month, and palladium prices briefly tumbled by nearly 9%.
"We have seen metal prices going into free fall when the Russia-Ukraine situation is likely to see a major detente, which spurred people's risk preference and optimism that the war could end at a time," said OANDA senior market analyst.
A Russian deputy defense minister says Moscow has decided to sharply curtail its military activities around Kyiv and Chernikov in Ukraine, following talks between Russian and Ukrainian representatives in Istanbul.
Where the prices of metals, natural gas, and commodities like the TaC powder will go in the future, is still very uncertain.
Introduction to Tantalum Carbide TaC Powder
Tantalum carbide is a kind of transition metal carbide. Black or dark brown metallic powder, cubic crystal system, hard. Melting point 3880℃, boiling point 5500℃, relative density 13.9, hardness 9 ~ 10. Insoluble in water, slightly soluble in sulfuric acid and hydrofluoric acid, soluble in a mixture of hydrofluoric acid and nitric acid.
Its chemical properties are extremely stable. It has excellent physical and chemical properties, such as high hardness, high melting point, good electrical conductivity, and thermal shock resistance, good chemical corrosion resistance, high oxidation resistance, catalytic performance, etc.
|Tantalum Carbide TaC Powder Properties|
|Other Names||tantalum(IV) carbide, TaC powder|
|Appearance||brown to dark brown powder|
|Boiling Point||4780-5470 °C|
|Solubility in H2O||insoluble|
Applications of Tantalum Carbide TaC Powder
Tantalum carbide is mainly used for cemented carbide, capacitors, electronic devices, high-temperature components, chemical equipment, and armor piercing shells.
1. Cemented carbide
Tantalum carbide plays an important role in cemented carbide. It improves the properties of the alloy by improving the fiber structure and phase transformation dynamics, making the alloy have higher strength, phase stability, and processing deformation ability. Tantalum carbide has a very high melting point (4000℃) and good thermodynamic stability. Tantalum is particularly effective in promoting nucleation and preventing carbon precipitation from nucleated brittle films formed during late solidification. Its main function is to prevent cemented carbide grain from growing up. In addition, it forms a third dispersion phase with TiC besides WC and Co, which significantly increases the thermal shock resistance, crescent hole wear resistance, and oxidation resistance of cemented carbide, and improves its redness and hardness.
TaC is added into the alloy in different ways, which will greatly affect the properties of the alloy. On the other surface, the TiC-TaC-WC core phase formed by adding TaC to the alloy as TiC-TaC-WC solid solution has a larger sub-crystal size and smaller microscopic strain than the TiC-TaC-WC core phase, and the former one has better physical and mechanical properties and longer cutting life.
2. Electronics industry
In recent years, transition metal carbides have attracted much attention due to their chemical stability, high hardness, strong oxidation and corrosion resistance, low resistivity, and many other advantages. Carbide nanomaterials show great potential in metal coatings, tools, machine parts, and composites. Among all the carbide nanomaterials, silver carbide is one of the most popular materials, and also one of the materials with the greatest potential. Tantalum carbide not only inherits many advantages of carbide nanomaterials, but also has its own unique side, such as high hardness (Mohs hardness is 9-10 at room temperature, high melting point (about 3880℃), high Young's modulus (283-550 GPa), strong conductivity (conductivity is 32.7-117.4μ ω ·cm at 25℃), high-temperature superconductivity (10.5K), strong resistance to chemical decay and thermal shock, and high catalytic activity for ammonia decomposition and hydrogen separation.
At present, tantalum carbide powder and whisk tantalum carbide have been prepared by means of carbothermic reduction, thermal plasma, solvothermal, sol-gel, microwave heating, alkali reduction, self-propagating high-temperature synthesis, and high-frequency induction heating sintering.
Among carbides, the best melting resistance is tantalum carbide (TaC) (melting point 3890℃) and hafnium carbide (HfC) (melting point 3880℃), followed by zirconium carbide (ZrC) (melting point 3500℃). These materials have excellent mechanical properties at high temperatures, far exceeding the best polycrystalline inks. Tantalum carbide, in particular, is the only material that maintains certain mechanical properties over the temperature range of 2900℃ to 3200℃. However, the disadvantage of tantalum carbide is that it is very sensitive to thermal shock, and the low thermal conductivity and high thermal expansion coefficient of carbide become the biggest obstacle to the application of aerospace materials. The addition of tantalum carbide to carbon/carbon composites will have higher thermal conductivity and lower thermal expansion conditions, and exert the oxidation resistance and ablative resistance of refractory metals.
Main Supplier of Tantalum Carbide TaC Powder
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and Nanomaterials, including silicon powder, nitride powder, graphite powder, zinc sulfide, calcium nitride, 3D printing powder, etc.
If you are looking for high-quality tantalum carbide TaC powder, please feel free to contact us and send an inquiry. ([email protected])
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 TaC powder are estimated to be influenced by international political situation changes.
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