Nov 19, 2020
China’s development achievements in the field of science and technology in recent years: China’s Sky Eye—the world’s largest single-aperture radio telescope FAST; China’s high-speed railway has a total mileage of 35,000 kilometers, ranking first in the world; the domestically-produced large aircraft C919 takes off with completely independent engines Research and development, independent production; China's independently developed manned submersible "Struggle" has reached a depth of 10909 meters...
In the manufacture of the C919 engine, a femtosecond laser is used to mark the hot end parts, a high repetition frequency picosecond ultrafast laser is used to process the air film cooling holes of the metal blade, and the femtosecond laser is used to engrave the engine ceramic composite material... more These ultrafast laser technologies have played their respective roles, significantly improving the performance of the workpiece and providing key manufacturing technologies for the successful development of Chinese domestic engines.
Why can ultrafast laser processing technology play an important role in these very critical but very complex manufacturing processes? Because it has these characteristics: First, accuracy. Since the thermal effect is very small, it will not cause heat-induced damage to the surrounding area, and there is almost no spatter around the active area. Therefore, its processing size is high and the processing quality can be accurately controlled; 2. Micro-nano scale. With fixed removal threshold and non-hot-melt removal mechanism, the processing size can cover micron, sub-micron or even nano-scale; third, material universality. Almost any material can be processed, including typical difficult-to-process materials such as super hard, super brittle, super sticky, super soft, and composite materials. These three characteristics have allowed the development and growth of ultrafast laser processing technology in aerospace and other fields.
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