Compatibility of PIP SiCf/SiC with LiPb at 700°C

Zhao, Shuang; Zhou, Xingui; Yu, Huan; Wang, Honglei; Wu, Yican; Huang, Qi; Zhu, Zhiqiang; Huang, Zelan

doi:10.1016/j.fusengdes.2010.04.060

Cited by 24 publications

(7 citation statements)

References 8 publications

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“…2 High-temperature creep resisitance of the three generation SiC fibers [9,13] 越大表明纤维的高温抗蠕变性能越好 [35] [38][39] , 并对影响纤维高温致密化的因素进行了研究 [40] , 但仍未完全实现连续 [41][42] [46][47] , 含乙烯基全氢聚碳硅烷 (Allyhydridopolycarbosilane, AHPCS) [48][49] , 液态含乙烯基聚碳硅烷(LPVCS) [50][51] 。尤其是 AHPCS, 其热解陶瓷产物中 C/Si 接近 1, 极具应用前景 [52][53] 。 Nanetti 等 [54] 以 AHPCS 为先驱体, Tyranno SA 纤维为增强体, 通过 PIP 工艺制备了 SiC f /SiC。它经 1700℃ 热处理后, 结晶性提高, 同时热导率升高到 30 W/(m•K)。 CVI 法工艺过程: 气态先驱体通过扩散或在压力差的作用下定向输送至纤维编织件, 并向其内部扩散, 在 900~1100℃下, 气态先驱体在编织件孔隙发生反应, 生成固态产物沉积在孔隙壁上, 孔隙壁随反应进行逐渐增厚 [55] 。该方法优点是能够得到高纯度、高结晶度的 SiC 基体; 适于制备大尺寸、复杂形状的部件。在 CVI 工艺过程中, 需要保持预制件表面气孔为开口, 以保证先驱体扩散的进行。但这一固有特性导致其主要缺点在于所得复合材料孔隙率较高(10%~15%) [56] , 并且制备周期长, 设备复杂、成本高。目前对 CVI 的改进包括: 强制流动/热梯度 CVI(F-CVI)和脉冲 CVI(P-CVI)等, 主要目的均是促进先驱体渗透, 降低孔隙率, 缩短制备周期 [57][58][59][60] 。 RMI 法工艺过程: 将 SiC 和 C 的混合微粉压入编织件中, 干燥后将硅/硅合金熔融渗透至基体, 并与接触的 C 反应, 生成 SiC, 制得致密的复合材料。该方法的优点在于所得材料孔隙率降低至 2%~5%, 制备周期短, 成本低 [61][62] , 但是材料中不可避免地存在游离硅, 限制了其耐高温性和抗辐射性 [63][64] [66][67][68] 。该方法已实现工业化, 产品为 Cef-NITE SiC f /SiC, 并成功制备了高温交换器、加热器件和隔热面板等器件 [69] ; 但其缺点是不可避免地引入残余氧化物烧结助剂。图 3 NITE 方法的工艺路线图 [65] Fig. 3 Process flow diagram of NITE technique [65] 电泳渗透是一种制备复合材料基体的方法, 将亚微米陶瓷颗粒配制成悬浊液, 在电泳作用下, 颗粒向纤维编织件内渗透并沉积。电泳渗透效果优于压力渗透, 但单纯通过 SiC 颗粒的电泳沉积所制得的复合材料孔隙率较高(35%)。Ivekovic 等 [70][71] 道插件以及偏滤器等部件上 [64,[85]…”

Section: Generationunclassified

Research and Development of Continuous SiC fibers and SiCf/SiC Composities

Qin¹,

Yong-Cai²

2016

Journal of Inorganic Materials

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Polymer-derived method is the main preparation method for continuous SiC fiber. So far, three generations of SiC-based fibers have been developed. SiC fiber is mainly used as reinforcement for SiC matrix to prepare SiC f /SiC composite, which exhibits excellent properties such as high-temperature resistance, oxidation resistance, high-temperature creep resistance, and neutron radiation stability. Therefore, it is considered as a promising preferred alternative material for structural components which works under harsh environments. In this review, the domestic and oversea development of the polymer-derived SiC fibers are introduced, in particular the different approaches for preparation and the characteristics of the 3 rd generation fibers. Then, the development of SiC f /SiC preparation technology and properties are reviewed and the relationship between the innovation in fabrication of SiC f /SiC composite and the development of SiC fiber is hightlighted. Finally, the application progress of SiC f /SiC composite in high performance aero-engines and fusion power cores is summerized. Meanwhile, some perspectives on the development of domestic SiC fibers and SiC f /SiC are also discussed.

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Section: Generationunclassified

Research and Development of Continuous SiC fibers and SiCf/SiC Composities

Qin¹,

Yong-Cai²

2016

Journal of Inorganic Materials

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“…There is some work already done regarding Pb-Li compatibility with SiC [39], but its application to lithium flows has been scarcely investigated. In fact, the laboratory could be a good facility for such purpose.…”

Section: Conceptual Design Of the Laboratorymentioning

confidence: 99%

Conceptual design of the liquid metal laboratory of the TECHNOFUSION facility

Abánades

García

Casal

et al. 2012

Fusion Engineering and Design

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The application of liquid metal technology in fusion devices requires R&D related to many phenomena: interaction between liquid metals and structural material as corrosion, erosion and passivation techniques; magneto-hydrodynamics; free surface fluid-dynamics and any other physical aspect that will be needed for their safe reliable operation. In particular, there is a significant shortage of experimental facilities dedicated to the development of the lithium technology. In the framework of the TECHNOFU-SION project, an experimental laboratory devoted to the lithium technology development is proposed, in order to shed some light in the path to IFMIF and the design of chamber's first wall and divertors. The conceptual design foresee a development in two stages, the first one consisting on a material testing loop. The second stage proposes the construction of a mock-up of the IFMIF target that will allow to assess the behaviour of a free-surface lithium target under vacuum conditions. In this paper, such conceptual design is addressed.

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“…Currently, three primary methods are used to apply oxidation protection coating on the surface of carbon materials: pack cementation, CVD [8] and slurry method [9]. Among these methods, pack cementation has to be carried out above 2073 K [10].…”

Section: Introductionmentioning

confidence: 99%