Ceramics in Diesel Engines
Production diesel engines also use ceramics.
Two such applications are in the fuel heater (prechamber) and the glow plug.
If you've ever driven a diesel car, you know that you have to wait 15 to 30 second after turning on the switch before you can push the starter. This delay is the time it takes to preheat the fuel.
Diesel fuel is thicker and heavier than gasoline and doesn't vaporize as easily, so is preheated with a ceramic heater before it can be ignited with a ceramic glow plug. Both of these devices are fabricated from silicon nitride.
The metering of diesel fuel is also a challenge and requires a precision fuel-injection system.
The key component of the fuel-injection system is the timing plunger.
Timing plungers used to be made of metal and were a major maintenance problem because they would wear and no longer meter the fuel properly.
Metal timing plungers were replaced with silicon nitride in 1989.
New designs introduced in 1995 were made with transformation-toughened zirconia.
Approximately 3 million ceramic timing plungers have been installed in truck engines and appear to have solved the wear and maintenance problems of the prior metal parts.
Another production diesel use for ceramics is as cam follower rollers fabricated from silicon nitride.
The up-and-down motion of the pistons in the transformed into the rotating motion of the drive engine must be shaft.
Previously, this transformation was achieved by mechanical levers and a sliding motion.
The sliding interfaces, however, wore too quickly and also decreased the power from the engine. because of friction.
A ceramic roller design at Detroit Diesel replaced the sliding metal design.
The silicon nitride rollers have reduced engine wear and friction, resulting in longer life and improved engine performance.
Ceramics in Diesel Engines
Production diesel engines also use ceramics.
Two such applications are in the fuel heater (prechamber) and the glow plug.
If you've ever driven a diesel car, you know that you have to wait 15 to 30 second after turning on the switch before you can push the starter. This delay is the time it takes to preheat the fuel.
Diesel fuel is thicker and heavier than gasoline and doesn't vaporize as easily, so is preheated with a ceramic heater before it can be ignited with a ceramic glow plug. Both of these devices are fabricated from silicon nitride.
The metering of diesel fuel is also a challenge and requires a precision fuel-injection system.
The key component of the fuel-injection system is the timing plunger.
Timing plungers used to be made of metal and were a major maintenance problem because they would wear and no longer meter the fuel properly.
Metal timing plungers were replaced with silicon nitride in 1989.
New designs introduced in 1995 were made with transformation-toughened zirconia.
Approximately 3 million ceramic timing plungers have been installed in truck engines and appear to have solved the wear and maintenance problems of the prior metal parts.
Another production diesel use for ceramics is as cam follower rollers fabricated from silicon nitride.
The up-and-down motion of the pistons in the transformed into the rotating motion of the drive engine must be shaft.
Previously, this transformation was achieved by mechanical levers and a sliding motion.
The sliding interfaces, however, wore too quickly and also decreased the power from the engine. because of friction.
A ceramic roller design at Detroit Diesel replaced the sliding metal design.
The silicon nitride rollers have reduced engine wear and friction, resulting in longer life and improved engine performance.
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