National Key Research Achievements Ceramic Engines, Automotive Engine Parts
National "Seventh Five-Year" Research Project - Silicon Nitride Ceramic Turbine
Silicon nitride ceramic turbine wear-resistant temperature, long life, energy saving. Won the "Seventh Five-Year" national key scientific and technological research award, is the national "75" "85" key scientific and technological research achievement projects, 95 years included in the national key scientific and technological achievements. Based on this result, we have researched and developed silicon nitride ceramic turbines, inserts, cylinder liners, rocker arms, tappets, valves and other products for automotive engines. The series uses high-performance ceramics as the base material.
China's the Seventh Five-year Plan(As follows is called "75") research project
Silicon nitride ceramics turbine turbine wheel
The “wa” of the “wet-resisting and heat resistance, life time is long, energy consumption reduction.” once won “75” the national key science and technology public relations prize, is the country “75” “85” the key Technical attack achievement project, in 1995 included the country scientific and technical payoffs key promotion project.
The serial products uses in high performance Ceramics matrix material completely.
Because silicon nitride ceramics have high mechanical strength, wear resistance, acid and alkali resistance, good thermal stability, and self-lubricating properties, they are required in special engineering applications such as aerospace, petroleum, and high temperature, corrosion, and mechanical wear. The use of silicon nitride ceramic parts in chemical industry is of great significance. It can be widely applied to the anti-wear, high-strength, high-temperature, corrosion-resistant and other elements in the motor, electrical, mechanical, and machining industries or replace the original traditional metal parts.
Technical indicators:
| Room temperature flexural strength |
≥900Mpa |
Room temperature fracture toughness |
6.0-8.0 Mpa.m1/2 |
| Bulk density |
3.20-3.4g/cm3 |
Room temperature volume resistivity |
1014Ω.cm |
| Relative permittivity at room temperature |
6-7 |
Thermal conductivity |
23-25W/（m-k） |
| Thermal expansion coefficient |
3.1×10-6/℃ |
hardness |
HRA92-94 |
Silicon nitride ceramic main performance indicators:
| performance |
Reaction sintering silicon nitride
EC-111L |
Atmospheric sintering silicon nitride
EC-125 |
The company's hot press sintering Silicon nitride |
| Bulk density（g/cm3） |
2.21 |
3.15 |
3.2~3.3 |
| Flexural strength（Mpa） |
137.3 |
490.3 |
≥900 |
| Fracture toughness(Mpa·m1/2) |
2.17 |
4.71 |
6.0~8.0 |
| Hardness(HRA) |
\ |
87.0 |
92.0~94.0 |
| Thermal conductivity(W/m·k) |
5.44 |
12.56 |
23~25 |
Thermal expansion coefficientχ10-6 ℃
(RT~1200℃) |
3.2 |
3.2 |
2.95~3 |
