The gains in engine connect to broader news in materials. The Chengdu Aerospace Superalloy Technology Company, a privately held corporation, made a major breakthrough in superalloy research. CASTC, according to the Global Times and People's Daily, is producing world class single crystal turbine blades from rhenium-nickel superalloys; adding rhenium to nickel increases the superalloy's melting point, allowing for a hotter and more efficient engine. High rhenium content superalloys are used in light weight, high thrust engines like the F-22 Raptor's F109 turbofan. Previously, the development of Chinese engines like the WS-10 were delayed as they suffered from quality control issues regarding single crystal turbine blades. China's mastery of the rhenium superalloy (and by the private sector, no less) won't just help China build current fighter engines, but also quickly research more capable, higher tech models.