We all know that belongs to non-ferrous metals tungsten, which in turn is also very important strategic metal, tungsten ore in ancient times was known as the "heavy stone." Swedish chemist Carl. William. She Yeer discovered scheelite, and extract the new elements acid - acid, in 1783 by the Spanish Air Asia discovery wolframite Depp also extract the acid. In the same year, with the carbon reduction of Tungsten copper alloy trioxide first got tungsten powder, and named the element. Tungsten content in the crust is 0.001%. Tungsten-containing minerals have been found 20 species. Tungsten deposits generally accompanied by granitic magma activity and the formation. Then after smelting tungsten is a silvery white and shiny metal, high melting point, hardness is also great.
Currently, the world's tungsten ore mined, about 50% for high-quality steel smelting, approximately 35% for the production of hard steel, approximately 10% for manufacturing tungsten wire, about 5% for other purposes. Tungsten can be manufactured firearms, rocket nozzles, metal cutting blades, drill bits, hard mold, drawing dies and so on. Extensive use of tungsten, involving mining, metallurgy, machinery, construction, transportation, electronics, chemical industry, light industry, textile, military, aerospace, technology, various industrial fields. The main purpose and its alloys are widely used in electronics, electric light industry, our most common is the home of the bulbs with tungsten filaments. Tungsten is a high-speed tool steel, alloy steel, spring steel, heat-resistant steel and stainless steel main alloying elements, used in the production of special steel large amount of tungsten. Tungsten through solid solution strengthening, precipitation strengthening and dispersion strengthening other methods to achieve alloyed tungsten material to enhance the high temperature strength, ductility. By alloying, has formed a variety of contemporary human civilization have a significant impact on non-ferrous alloys. New Metal Materials Co., Ltd. Baoji Lai Baoji City in Shaanxi Province, the main nickel titanium memory alloy plates and tungsten, molybdenum, tantalum, niobium and titanium zirconium and hafnium and other rare metals and other materials. Do not know whether it is useful for you to do?
Molybdenum carbide has a high melting point and hardness, good thermal stability and mechanical stability, and excellent corrosion resistance and other characteristics. Molybdenum is a silvery white refractory metal, a melting point of 2615 ℃, density of 10.2 g / cm 3, the expansion coefficient is small, a special tube is almost the same coefficient of expansion of the glass. Molybdenum stable at room temperature is higher than 600 ℃, rapidly oxidized.
没有评论:
发表评论