碳化硅是一种理想的密封材料，具有优良的耐化学腐蚀性能，较高的机械强度，耐高温，耐磨性好，自润滑性好，组对 性能好，摩擦系数小，优异的热传导性等特点。特别是常压烧结碳化硅，能够满足更为苛刻的工况条件。
碳化硅作为高温结构材料，已广泛地应用于石油，化工，机械，军工，船舶，航天，汽车等领域。并可广泛地用作机械 密封的摩擦副付材料，尤其是泥浆泵用的摩擦付材料。
Silicon carbide is the idea sealing material.lt has good corrosion resistance,higher mechanical intensity, excellent resisting wearability and high temperature, good self-lubricity and making-group, low friction factor , good heat-conduction and so on. Especially self sintered silicon carbide, it can suit for the hard working condition.
The silicon carbide ,as the high- temperature structural material, is widely used in the petroleum, the chemical industry, Machinery ,war industry, shiping, spaceflight, the automobile and other fields.Also, it is widely applied to friction material of mechanical seals, especially friction material of slush pump.
性能 Performanace | 反应烧结碳化硅 (RS) | 常压烧结碳化硅 (SSC) | 碳化硅加碳 (Sic+c) |
纯度(%)碳化硅含量 Purity (sic pcentage) | >90 | >97 | 含碳30% |
密度g/cm3 Density (g/cm3) | >3.05 | 3.05-3.15 | 2.65 |
硬度(HRA) » Hardness (HRA) | 115〜125(HS) | >92(HRA) | >85(HS) |
颗粒度(um) Grain size(um) | 8〜20 | 0.5〜0.7 | 20 〜40 |
弹性模量(Gpa) Elastic modulus(Gpa) | 420 | 400 | - |
抗弯强度(Mpa) Bend strength(Mpa) | 350〜450 | 400〜580 | 200 |
抗压强度(Mpa) Compressive stremgth(Mpa) | 3000 | 3900 | 1800 |
断裂强度(Mpa -m-) Fracture toughness(Mpa • m1 2) | 4 | 4.5 | - |
热传导系数(Wm/k) Thermal conductivity (Wm/k) | 35 〜110 | 125.6 | 125 |
热膨胀系数d/°c) Coefficent of heat expansion (1/°C) | 4.3 X 10-6 | 4.02 X 10-6 | 3 X 10-6 |
耐热温度(大气中) Heat Resistance (atmosphere) | 1300°C | 1650°C | 800°C |
泊桑比 Poisson ratio | 0.15 | 0.14 | - |