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Silicon Nitride Ceramics Turbine Wheel The silicon nitride ceramics turbine turbine wheel is wear-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. Studies the development silicon nitride ceramics in this achievement's foundation (turbine wheel, to inlay block, cylinder jacket, rocking shaft, a column, tire valve) and so on serial productses, uses in the motor car engine. The serial products uses the high performance ceramics matrix material completely.<br /><br />Technical Data：<br />Breaking Strength at Room Temperature:≥900Mpa<br />Fracture Toughness at Room Temperature:6.0-8.0 Mpa.m1/2<br />Volume Density:3.20-3.4g/cm3<br />Volume Resistivity at Room Temperature：1014Ω.cm<br />Relative Dielectric Constant at Room Temperature:6-7<br />Heat Conductivity:23-25W/（m-k）<br />Thermal Expansion Coefficient:3.1×10-6/℃<br />Hardness:HRA92-94<br /><br />Main Performance Indexes of Silicon Nitride Ceramics:<br />Reactive Sintering Silicon Nitride EC-111L<br />Volume Density（g/cm3）: 2.21<br />Bending Strength（Mpa）: 137.3<br />Fracture Toughness(Mpa·m1/2): 2.17<br />Hardness(HRA) \<br />Heat Conductivity Coefficient (W/m·k): 5.44<br />Thermal Expansion Coefficient χ10-6 ℃(RT~1200℃): 3.2<br /><br />Normal Pressure Sintering Silicon Nitride EC-125<br />Volume Density（g/cm3）: 3.15<br />Bending Strength（Mpa）: 490.3<br />Fracture Toughness (Mpa·m1/2): 4.71<br />Hardness (HRA): 87.0<br />Heat Conductivity Coefficient (W/m·k): 12.56<br />Thermal Expansion Coefficient χ10-6 ℃(RT~1200℃): 3.2<br /><br />Company’s Hot Pressed Sintering Silicon Nitride<br />Volume Density（g/cm3）: 3.2~3.3<br />Bending Strength（Mpa）: ≥900<br />Fracture Toughness(Mpa·m1/2): 6.0~8.0<br />Hardness (HRA): 92.0~94.0<br />Heat Conductivity Coefficient (W/m·k): 23~25<br />Thermal Expansion Coefficient χ10-6 ℃ (RT~1200℃): 2.95~3<br />