The great Da Vinci pioneered the design of many advanced machines, but he could not turn them into reality because there was no suitable material to meet his design requirements. In 1929, the engineer Lillian Feld obtained the patent for the transistor. But it was not until nearly two decades later that it became a commercial product in Bell Labs. In the 1970s, China designed the Backfire and B1 bombers as combat objects, and its flight indicators reached double 26 (ceiling limit 2.6 kilometers, speed 2.6 Mach)’s J-9 fighter jet, but because of the lack of suitable materials and processing technology, it had to stay at the drawing stage. The J-10 and J-20, which represent the highest level of China’s aviation technology, went to the sky one after another, but because there was no engine material that could withstand high temperature and pressure, But you can't have a Chinese core. This is an era when materials are king. Welcome friends to try it out.