Use of Electrophoretic Impregnation and Vacuum Bagging to Impregnate SiC Powder into SiC Fiber Preforms

Use of Electrophoretic Impregnation and Vacuum Bagging to Impregnate SiC Powder into SiC Fiber Preforms
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利用电泳浸渍和真空袋将 SiC 粉末浸渍到 SiC 纤维预制件中

DOI:
10.1111/ijac.12143
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发表时间:
2013
影响因子:
2.1
通讯作者:
Binner J
Binner J
中科院分区:
材料科学3区
文献类型:
--
作者:
Binner J

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采用真空袋法(VB)和电泳浸渍法(EPI)对SiC粉末在Nicalon SiC织物预成型件中的浸渍工艺进行了研究。目的是生产用于随后的化学气相渗透(CVI)的预浸渍样品,其具有减少的纤维束间孔隙率,该孔隙率由织物层的构造产生,同时留下对于成功渗透不可或缺的未堵塞的纤维束内孔隙率。因为目标仅仅是了解样品的增韧能力,所以没有像生产SiCf/SiC复合材料时通常使用的那样向纤维施加界面涂层。虽然VB工艺通常产生更强的预成型件,但取决于所使用的压力和粉末粒度,其导致粉末变得位于丝束内而不是丝束间孔隙中。相比之下,提供了一个适当的电极布置使用,EPI提供了一个更可控的浸渍过程与主要发现在丝束间孔隙的粉末的潜力;然而,预制件是非常薄弱的,容易分层。这两种工艺的组合产生了一种非常成功的方法,具有更大的颗粒渗透均匀性和更高的绿色强度,同时在很大程度上避免了浸渍流内孔隙率。
Techniques based on vacuum bagging (VB) and electrophoretic impregnation (EPI) have been investigated for the impregnation of SiC powder into layered Nicalon SiC fabric preforms. The aim was to produce preimpregnated samples for subsequent chemical vapor infiltration (CVI) with reduced intertow porosity that arises from the construction of the fabric layers while leaving unblocked the intratow porosity that is so indispensable for a successful infiltration. Because the goal was simply to learn about the ability to impregnate the samples, no interphase coating was applied to the fibers as would normally be used when producing SiCf/SiC composites. While the VB process generally yielded much stronger preforms, depending on the pressure used and the powder particle size, it resulted in powder becoming located in the intratow rather than the intertow porosity. In contrast, provided an appropriate electrode arrangement was used, EPI offered the potential for a more controlled impregnation process with the powder primarily found in the intertow porosity; however, the preforms were very weak and delaminated easily. The combination of the two processes resulted in a very successful approach, with greater uniformity of particle infiltration and higher green strengths, while largely avoiding impregnating the intratow porosity.
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