功能分级sic基柴油机废气过滤器的研制

T. Gerdes, M. Willert-Porada
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引用次数: 0

摘要

介绍了一种新型碳化硅基过滤器的研制,该过滤器由于具有分级孔结构而具有较低的压降,同时由于不同的过滤机理而具有较高的过滤性能。加工路线以孔隙度分级的碳素纸/炭黑复合材料为基础。采用微波辅助化学蒸汽渗透(CVI)技术,在复合材料表面涂覆硅并进行部分渗碳,使所得SiC的抗氧化性与剩余碳纤维芯的良好机械强度相结合。为了降低运行过程中的除烟温度,在材料表面涂覆了一层铂/ tio2催化剂。
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Development of Functionally Graded SiC-Based Diesel Engine Exhaust Gas Filter
The development of a SiC-carbide based filter that combines a low pressure drop due to a graded pore structure with high filtration performance ascribed to different filtration mechanism is presented. The processing route is based on carbon paper/carbon black composites with graded porosity. By microwave assisted chemical vapor infiltration (CVI) the composite is coated with silicon and partially carbidized in a way, that the oxidation resistivity of the obtained SiC is combined with the good mechanical strength of the remaining carbon fiber core. To reduce the soot removal temperature during operation, the material is coated with a Platinum/TiO2catalyst.
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