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首页> 外文期刊>Ceramic Engineering and Science Proceedings >ENHANCING THE PASSIVE DAMPING OF PLASMA SPRAYED CERAMIC COATINGS
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ENHANCING THE PASSIVE DAMPING OF PLASMA SPRAYED CERAMIC COATINGS

机译：增强等离子喷涂陶瓷涂层的无源阻尼

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Hard coatings deposited by plasma spray can dissipate vibratory energy as well as enhance the ability of turbine components to withstand the environment. However, with no other dissipative mechanism, reducing system quality factors (Q) in bending vibration to a target of 100 while increasing thickness no more than 10% requires a material loss modulus of at least 3.7 GPa (0.54 Mpsi) at strains of interest. Such ceramics as magnesium-aluminate spinel, alumina, titania-alumina, and yttria stabilized zirconia have been found to have loss moduli of only 1-2 GPa Preliminary work has shown that vacuum infiltrating alumina with a viscoelastic material (VEM) chosen for effectiveness at about 200℉(93℃) increased the loss modulus at strains of 400 ppm by a factors of 2 at room temperature and 3 at the design temperature. Infiltration of plasma-sprayed titania-alumina with the same VEM showed increases of factors of 3 and 4, respectively. An infiltrate with a higher glass transition temperature enables high damping at higher temperatures. In current work, particles of high temperature viscoelastic material (HTVEM) are co-sprayed with yttria stabilized zirconia. Preliminary results at low levels of strain suggest that the loss modulus of such materials at 1000-1400℉(540-760℃) may be as much as four times that obtained with the low temperature infiltrate at 93℃.
机译：通过等离子喷涂沉积的硬质涂层可以消散振动能量，并增强涡轮机部件承受环境的能力。但是，在没有其他耗散机制的情况下，将弯曲振动中的系统品质因数（Q）降低至100的目标，同时将厚度增加至不超过10％时，在感兴趣的应变下，材料损耗模量至少应为3.7 GPa（0.54 Mpsi）。已发现诸如铝酸镁尖晶石，氧化铝，二氧化钛-氧化铝和氧化钇稳定的氧化锆之类的陶瓷的损耗模量仅为1-2 GPa。大约200℉（93℃），在400 ppm应变下的损耗模量在室温下增加2倍，在设计温度下增加3倍。用相同的VEM渗入等离子喷涂的二氧化钛-氧化铝表明，因子增加分别为3和4。具有较高玻璃化转变温度的渗透物可以在较高温度下提供高阻尼。在目前的工作中，高温粘弹性材料（HTVEM）的颗粒与氧化钇稳定的氧化锆共同喷涂。在低应变水平下的初步结果表明，此类材料在1000-1400℉（540-760℃）下的损耗模量可能是低温在93℃下渗入时的损耗模量的四倍。

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