Syllabus Section: Defence Technology
Why in News?
DRDO develops crystal blades for aero engines.
- This is part of a programme taken up by Defence Metallurgical Research Laboratory (DMRL) to develop five sets of single crystal high-pressure turbine (HPT) blades using a nickel-based superalloy.
Single Crystal Blades Technology
- The Single Crystal blades are made of nickel based super alloys. These alloys are capable of withstanding high temperatures.
- To offset the limitations imposed by grain boundaries in polycrystalline materials, metallurgists have sought to eliminate grain boundaries from turbine airfoils altogether, by inventing techniques to cast single-crystal turbine blades and vanes, and design alloys to be used exclusively in single-crystal form.
- This development marks a major technological breakthrough. Very few countries such as the U.S., the U.K., France and Russia have the capability to design and manufacture such single crystal components.
- The helicopters need powerful and compact aero engines to operate in extreme conditions. In order to achieve this, Single Crystal Blades are essential.
Source: All India News