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首页> 外文会议>Mechanical properties and performance of engineering ceramics and composites VII >HIGH PRESSURE SEAWATER IMPINGEMENT RESISTANCE OF LOW SILICA ALUMINUM OXIDES
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HIGH PRESSURE SEAWATER IMPINGEMENT RESISTANCE OF LOW SILICA ALUMINUM OXIDES

机译：低硅铝氧化物的高压海水冲击阻力

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High purity alumina is used to make energy recovery devices for seawater reverse osmosis (SWRO) desalination. These devices reduce energy consumption of large water factories by up to 60%. SWRO applications are unusual for ceramics since they are continuous processes that combine corrosive and abrasive fluid conditions with occasional cavilation energy. Selecting a starting material for a product formulation is critical. High purity specialty alumina powders, with minimized soda and silica levels, have been developed for high performance ceramics. Available products included the now obsolete Alcan RAC45B, and a new alumina developed by Rio Tinto Alcan, P172HPB which targets levels of <0.03% soda and <0.02% silica. Though similar products are available in the market, aluminas made from these raw materials perform differently in seawater impingement. Super ground, >99.5% pure alumina powders, including Rio Tinto Alcan P172HPB, were processed into sample coupons using Energy Recovery Inc.'s (ERI) production spray dry, cold isostatic press, and sintering processes. These ceramic coupons, along with commercially procured ceramic reference samples, were subjected to a modified ASTM G134 - 95 cavitation test followed by structural characterization. After testing, surface roughness increased to 2.54 to 5.08 μm R_a. Cavitation damage appears to correlate with hardness, grain size, and fired density. Fired density data also reveals that the P172HPB should offer physical properties equal to or better than the other aluminas available. In general, raw materials with overall lower impurity levels appear to perform better in SWRO conditions.
机译：高纯度氧化铝用于制造用于海水反渗透（SWRO）脱盐的能量回收装置。这些设备可将大型水厂的能耗降低多达60％。 SWRO应用对于陶瓷是不寻常的，因为它们是连续的过程，将腐蚀性和磨蚀性流体条件与偶尔的空化能量结合在一起。选择产品配方的原材料至关重要。苏打水和二氧化硅含量最少的高纯度特种氧化铝粉已开发用于高性能陶瓷。可用产品包括现已淘汰的Alcan RAC45B，以及Rio Tinto Alcan开发的新型氧化铝P172HPB，其目标是苏打水含量<0.03％，二氧化硅含量<0.02％。尽管市场上可以买到类似的产品，但由这些原料制成的氧化铝在海水冲击方面的性能却有所不同。使用Energy Recovery Inc.（ERI）生产的喷雾干燥，冷等静压和烧结工艺将包括Rio Tinto Alcan P172HPB在内的> 99.5％的超研磨纯氧化铝粉末加工成样品试样。将这些陶瓷试样与商业采购的陶瓷参考样品一起进行改良的ASTM G134-95空化测试，然后进行结构表征。测试后，表面粗糙度增加到2.54至5.08μmR_a。空化损伤似乎与硬度，晶粒尺寸和烧结密度相关。燃烧密度数据还显示，P172HPB的物理性能应等于​​或优于其他可用的氧化铝。通常，杂质水平总体较低的原料在SWRO条件下表现更好。

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