Nowadays, the solution is to make tungsten into porous tungsten skeleton, and then infiltrate copper into porous tungsten skeleton to obtain tungsten-copper composite materials which synthesize the respective characteristics of tungsten and copper. That is to say, the tungsten-copper radiator can reduce the surface temperature of tungsten-copper by using the transpiration refrigeration effect formed by copper volatilization at high temperature, and ensure the use at high temperature extreme conditions, that is to say, it can prevent the deformation of copper material when the heat exchange of chip is large.
However, the preparation of porous tungsten skeleton is very difficult, because tungsten is not only a strategic metal, but also a refractory metal. It has excellent properties such as wear resistance, high hardness, high strength, corrosion resistance and good toughness. The traditional processing technology of tungsten metal is powder metallurgy plus machining. The complex process leads to a long processing cycle. Moreover, it is difficult for the porous structure to open the mould. All of these will lead to a result, that is, high cost. In addition, tungsten metal is brittle at room temperature (easy to produce debris and defects on the machined surface) and has high hardness (which will aggravate the wear of dies and cutting tools), which greatly increases the difficulty of later machining. In a word, the traditional production technology can not meet the current human desire for production and processing. Maybe we can consider the cutting-edge manufacturing technology. For example, in recent years, 3D printing technology which has attracted wide attention from all walks of life and integrates design and manufacturing.
To some extent, we should all know that today, add-on manufacturing technology has more than 30 years of application and development history, and the emergence of its ideas can be traced back to the end of the nineteenth century in the United States. At present, this technology has been widely used in the manufacture of stainless steel, superalloy and titanium alloy complex parts. However, there is still a big gap between China and advanced countries in the field of 3D printing of tungsten materials. Now, the gap is gradually narrowing, because our team has successfully solved the laser precision forming of refractory tungsten metal materials, and printed out tungsten-based alloy chip radiators for aerospace field. The 3D printing technology makes the channel structure of the radiator more flexible, and the production cycle is greatly shortened. Even the porous variable diameter structure can be formed at one time, and it does not need to be processed later.
Space exploration never ends! Our scientific and technological workers and astronauts will contribute Chinese wisdom to the development of world space industry and more Chinese strength to the peaceful use of space for mankind. And our scientific research team will also climb the peak of 3D printing technology, to significantly shorten the research and development cycle of aerospace equipment, improve the utilization of materials, reduce manufacturing costs, optimize the structure of parts, reduce the weight of materials, prolong service life and other contributions!
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