Vegetable oil is the most important food for the people. It is not only the most basic raw material for the food industry, but also an important raw material for industrial and agricultural production and national defense construction.
Tungsten alloy weights have a long history of development. China has entered the heyday of bronze castings between 1700 and 1000 BC, and the process has reached a fairly high level. Europe also began producing counterweights around the eighth century.
Average content of molybdenum in the earth's crust is 0.00011%, and the global reserves of molybdenum resources are about 11 million tons. Molybdenum has the advantages of high strength, high melting point, corrosion resistance, wear resistance and the like, and is widely used in steel, petroleum, chemical, electrical and electronic technology.
The source of molybdenum concentrate is mainly divided into copper sulfide, tungsten and molybdenum and other associated molybdenum ore (MoS2). During the period of 2011-2015, due to the continuous decline of copper prices, some copper-molybdenum mines accelerated the implementation of associated molybdenum metal.
With the gradual recovery of the global economy, the demand for global aviation aircraft will be huge in the next few years. According to the forecast of Airbus and Boeing in the next 20 years of the civil aviation aircraft market, the global civil aviation aircraft market will reach 5.6 trillion US dollars in the next 20 years.
The powder particle size and uniformity of tungsten powder and copper powder will affect the sintering effect of tungsten-copper alloy electrode to a certain extent. The reduction of powder particle size will make the comprehensive properties of materials such as density, hardness etc.
The morphological distribution of the tungsten-copper powder sintered material is uniformly distributed on the copper substrate with tungsten as a skeleton. Due to the high melting point and high hardness of tungsten W, the ultimate tensile strength of tungsten at 1000 ° C is still 50kgf / mm2