The improvement of the performance of tungsten-copper alloy is a concern of modern manufacturers. The alloy is a uniformly mixed structure of two-phase monomers of tungsten and copper. It is neither miscible nor intermetallic. It is a typical pseudo alloy.
In 1792, the Swedish chemist Elm used a mixture of charcoal and molybdic acid blended with linseed oil and burned in a sealed manner to obtain molybdenum. Because metallic molybdenum has the advantages of high strength, high melting point, corrosion resistance, and wear resistance
China has the largest tungsten reserve and tungsten output whose reserve are four times of other countries in the world, tungsten ore was found early 10th century and was called "heavy stones" at that time.
Among all refractory metals, molybdenum is the most commonly used metal. When made into an alloy, it has extremely high resistance to high temperatures and creep, making it extremely resistant to corrosion.