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首页> 外文会议>High temperature ceramic matrix compositei III >Tensile Creep Properties of Si-M-C-O (M=Ti or Zr) Fibers in Air Derived from Polymer Precursors
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Tensile Creep Properties of Si-M-C-O (M=Ti or Zr) Fibers in Air Derived from Polymer Precursors

机译：Si-M-C-O（M = Ti或Zr）纤维在源自聚合物前体的空气中的拉伸蠕变特性

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Creep tests of silicon carbide fibers containing small amounts of titanium or zirconium were performed in air at 1373-1573K. The fibers showed steady state creep after a short transient period, while apparent degradation of the fibers was suppressed by the oxide layer formed on the fiber surface. The fiber containing zirconium showed a high creep resistance at 1373K as compared to the fibers containing titanium, but the steady state creep rates of the tested fibers was almost similar at 1573K on a logarithmic scale. In the tests at 1573K with a 1.02 Gpa load, most of the fibers were ruptured before the steady state creep region. Appeared activation energies and stress exponents derived from the steady state creep rates arc consistent with ordinary Newtonian flow mechanism in the tested fibers. The activation energy for the creep of the fiber containing titanium was, however, considerably lower than that of tho reported SiC materials. Minor structural changes in the fiber possibly influence the apparent creep rate.
机译：含少量钛或锆的碳化硅纤维的蠕变测试是在1373-1573K的空气中进行的。在短的瞬态时间后，纤维表现出稳态蠕变，而通过在纤维表面上形成的氧化物层抑制了纤维的明显降解。与含钛的纤维相比，含锆的纤维在1373K处显示出较高的抗蠕变性，但是在对数尺度上，测试纤维的稳态蠕变速率在1573K时几乎相似。在1573K，1.02 Gpa载荷下的测试中，大多数纤维在稳态蠕变区之前就破裂了。由稳态蠕变率得出的活化能和应力指数与测试纤维中的普通牛顿流动机理一致。但是，含钛纤维蠕变的活化能明显低于以前报道的SiC材料。纤维的微小结构变化可能会影响表观蠕变速率。

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