The PRC began mass cultivation of supercrystal, which was produced only by the USSR and the USA

The People’s Republic of China has officially entered the narrow circle of world powers that own the full-cycle technology for the production of monocrystalline turbine blades. Until recently, only the United States, Russia (as the successor to the USSR), Great Britain and France could independently create these critical parts. Now Beijing has officially joined this pool, announcing the industrial production of components based on its own nickel superalloy DD6, reports the Global Times.

Beijing Aviation Materials Institute AECC chief engineer Li Jiarong told state media that the team has created a second-generation nickel superalloy, DD6, which has completely independent intellectual property rights. According to him, the characteristics of the material are superior or equivalent to Western analogues at a noticeably lower production cost.

To understand the complexity of the task, it is necessary to recall what a turbine blade actually is. This is not just a piece of complexly shaped metal, but a key element of a modern jet engine. It operates in extreme overload mode: gases heated to temperatures close to the melting point of the metal pass through it, and centrifugal forces try to tear the structure apart. Any other metal under such conditions would inevitably creep and crack along the boundaries of crystalline grains.

The secret of DD6 is the absence of these very boundaries. The blade is a single crystal, which eliminates weak points and provides phenomenal heat resistance. Creating such a geometry requires precise control over the directional crystallization process: engineers have spent decades selecting alloying additives to combat oxidation, corrosion and deformation.

Screenshot from China Media Group presentation
China Media Group

40 years of perseverance

The Chinese program, which started back in the 1980s, has gone from simple solid-cast billets to highly complex hollow blades with internal cooling channels, which is necessary for fifth-generation engines and promising civil power plants.

As Yue Xiaodai, a researcher at the institute, explained, the secret lies in the scientifically based and strictly dosed addition of alloying elements. Despite the radically different physical and chemical properties of these additives (responsible for heat resistance, creep and corrosion resistance), engineers were able to achieve uniform fusion and effective control of impurities.

Today, DD6 will become the most popular superalloy in Chinese aviation, saving, according to Li Jiarong, a significant amount of strategic resources. The technological chain is incredibly complex: from smelting the alloy to the final product, it is necessary to go through more than ten key stages, each of which is divided into dozens of precision operations. And now China is one of five countries in the world that controls this entire path.

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