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Diesel Fuel-Injection Components |
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| High-pressure fuel injection offers great potential for improving fuel efficiency and reducing exhaust pollution from diesel engines. Ceramic sliding components, which offer extreme wear resistance and anti-seizure characteristics, can maximize this potential. Kyocera produces a wide range of ceramic sliding components that can allow fuel pumps to operate at extremely high pressure without compromising reliability. |
| Product Outline |
|
 Characteristics Chart |
|
| |
Temp. |
Units |
Silicon Nitride
SN220 |
Silicon Nitride
SN235P |
Silicon Nitride
SN755 |
Zirconia
Z220 |
| Flexural Strength |
Room Temperature |
MPa |
550 |
800 |
1050 |
642 |
| 1000°C |
MPa |
496 |
748 |
- |
289 |
| Vickers Hardness |
Room Temperature |
GPa |
13.8 |
14.2 |
14.5 |
11 |
| Fracture Toughness |
Room Temperature |
MPa/m |
4.7 |
6.3 |
5.7 |
6 |
| Young's Modulus of Elasticity |
Room Temperature |
GPa |
291 |
300 |
303 |
205 |
| Coefficient of Linear Thermal Expansion |
40°C to 800°C |
x10-6/°C |
3.2 |
3.0 |
3.1 |
10.3 |
| Thermal Conductivity |
Room Temperature |
W/mK |
25 |
30 |
20 |
3.4 |
| Specific Heat |
Room Temperature |
J/gK |
0.66 |
0.66 |
- |
0.46 |
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| History of Ceramic Sliding Components |
|
| Products |
Applications |
Materials |
Pump
Pressures |
Mass Produced
Since: |
Notes |
| Roller Bushing |
Fuel-Injection
Pump |
SN235P |
100Mps |
1996 |
Ceramic roller bushings offer 3x higher anti-seizure capability and 43% higher pump pressure than conventional material thrust bearings. |
| Washer |
Fuel-Injection
Pump |
SN220 |
100Mps |
1997 |
Offers anti-seizure, wear resistance, oil resistance and lubricity improvements under very high pressure. No problem at more than 2,000 rpm, full power. |
| Roller Pin |
Fuel-Injection
Pump |
SN755 |
160Mps |
1999 |
Applicable to higher-pressure pumps; offers superior wear resistance and anti-seizure |
Needle
Piston
Pressure Pin |
Fuel-Injection
Nozzle |
Z220
Z220
SN220 |
|
Under Development |
Zirconia matches thermal expansion of materials; resists wear |
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