Turbine drills work in underground environments with high temperature, high pressure, strong corrosion and strong wear, so their materials need to have high strength, corrosion resistance, wear resistance and high temperature resistance. The following are the common materials and characteristics of the main components of turbodrills:
1. Turbine section
Turbine stator and rotor:
Material: Usually high-strength stainless steel (such as 17-4PH, 15-5PH) or nickel-based alloy (such as Inconel 718).
Features: High strength and corrosion resistance, can remain stable at high speed and high pressure.
Casing:
Material: High-strength alloy steel (such as 4140, 4340).
Features: High strength and toughness, can withstand complex underground stress.
2. Spindle
Material: High-strength alloy steel (such as 4140, 4340) or martensitic stainless steel (such as 17-4PH).
Features: High strength and fatigue resistance, can transmit large torque and axial force.
3. Bearing section
Bearing:
Material: Usually carbide (such as tungsten carbide) or ceramic materials are used.
Features: High hardness and wear resistance, can work under high load and high speed.
Bearing seat:
Material: High-strength alloy steel (such as 4140, 4340).
Features: High strength and wear resistance, can support bearings and bear loads.
4. Drill bit
Material: Carbide (such as tungsten carbide) or diamond composite material (such as PDC).
Features: High hardness and wear resistance, can effectively crush rocks.
5. Other parts
Seal:
Material: Fluororubber (FKM) or polytetrafluoroethylene (PTFE).
Features: High temperature and corrosion resistance, ensure sealing performance.
Connector:
Material: High-strength alloy steel (such as 4140, 4340).
Features: High strength and fatigue resistance, ensure reliable connection.
Summary
The material selection of turbodrills is crucial to their performance and life. Main components such as turbine sections, spindles, bearing sections and drill bits are usually made of high-strength alloy steel, stainless steel, nickel-based alloys, cemented carbide and ceramics to ensure reliability and durability in high-strength, high-wear and strong corrosion environments.