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    • 1. 发明申请
    • Airfoil having improved impact and erosion resistance and method for preparing same
    • 具有改进的耐冲击和耐腐蚀性的翼型及其制备方法
    • US20070253825A1
    • 2007-11-01
    • US11656974
    • 2007-01-24
    • Robert BruceJerry SchellMark Gorman
    • Robert BruceJerry SchellMark Gorman
    • F03B3/00
    • F01D5/288C23C28/321C23C28/322C23C28/34C23C28/341C23C28/42C23C30/00F01D25/007F04D29/023F04D29/324F05D2230/90F05D2240/303F05D2260/95Y02T50/672Y10T428/12458
    • A turbine airfoil having an improved impact and erosion resistance. The airfoil comprises: (a) a base segment having an impact resistant leading edge section proximate to the leading edge comprising a material having having a yield strength of least about 250 ksi and an elongation percentage of about 12% or less; and (b) an erosion resistant coating overlaying the base segment at least in the leading and trailing edge portions of the pressure side, the erosion resistant coating comprising at least one ceramic layer having at least one of the following properties: (1) an erosion value of at least about 200 g. of erodent to cause a thickness loss of about 15-20 microns; (2) an erosion volume loss value (V) of about 1.9 or less as defined by the equation V=H−0.18×E0.75×F−1.65 where H is hardness, E is elastic modulus and F is fracture toughness; and (3) an F value of at least about 1.5 MPa*m1/2. The erosion resistant coating can comprise alternating ceramic and metallic layers and is typically formed by a method involving the step of forming on the pressure side of the base segment of the airfoil in alternating fashion at least one ceramic layer and at least one metallic layer.
    • 具有改善的冲击和耐冲蚀性的涡轮机翼型。 翼型件包括:(a)具有靠近前缘的抗冲击前缘部分的基部段,包括具有至少约250ksi的屈服强度和约12%或更小的伸长率的材料; 至少在所述压力侧的前缘部和后缘部分覆盖所述基部段的抗侵蚀涂层,所述耐侵蚀涂层包括至少一个具有以下特性中的至少一个的陶瓷层:(1)侵蚀 值至少约为200g。 的腐蚀导致约15-20微米的厚度损失; (2)如等式V = H -0.18的限定的约1.9或更小的侵蚀体积损失值(V)x = 0.75×F -1.65 < SUP>其中H是硬度,E是弹性模量,F是断裂韧度; 和(3)F值至少约1.5MPa * m 1/2。 抗侵蚀涂层可以包括交替的陶瓷和金属层,并且通常通过以下方法形成,该方法包括以至少一个陶瓷层和至少一个金属层交替形成在翼型的基部段的压力侧上的步骤。