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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials; 20060704-08; Vancouver(CA) >Novel Processing of Porous Titanium Composite for Producing Open Cell Structure
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Novel Processing of Porous Titanium Composite for Producing Open Cell Structure

机译：多孔钛复合材料制备开孔结构的新工艺

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Processing technique to produce open-cell porous titanium composite was developed. One of the outstanding benefits of porous titanium composite is both physical and mechanical properties can be controlled widely by changing the metal/ceramic fraction and cell structures. In this work, porous titanium composite was fabricated by a chemical reaction between titanium powder and boron carbide (B4C) powder. The reactions between titanium and B4C generates a large amount of latent heat and, therefore, it was a combustion and self-propagating mode. Precursors were made by compacting the starting powder blend (Ti and B4C), and heated in an induction furnace to induce the reaction. The reaction was strongly exothermic and, therefore, the precursor was sintered by its latent heat when the Ti/B_4C blending ratio was appropriate. The reaction products were titanium boride (TiB and/or TiB_2) and titanium carbide (TiC). By controlling the Ti/B_4C blending ratio, it was possible to control the volume fraction of reaction products in titanium matrix. The combustion synthesized titanium composite was porous and its cell structure was strongly affected by the processing condition of the precursor (porosity and Ti/B_4C blending ratio). High porosity with open pores was obtained with small Ti/B_4C ratios and high porosity of the precursor, while the cell structure was closed and spherical with high Ti/B_4C ratio. The cell-wall size was varied from several tens of microns to about 500 microns by changing the combustion temperature.
机译：开发了开孔多孔钛复合材料的生产工艺。多孔钛复合材料的突出优点之一是可以通过改变金属/陶瓷组分和孔结构来广泛控制物理和机械性能。在这项工作中，多孔钛复合材料是通过钛粉末和碳化硼（B4C）粉末之间的化学反应制备的。钛与B4C之间的反应会产生大量潜热，因此是燃烧和自蔓延模式。通过压实起始粉末混合物（Ti和B4C）制得前体，并在感应炉中加热以引发反应。反应强烈放热，因此，当Ti / B_4C的混合比例合适时，前体通过潜热进行烧结。反应产物是硼化钛（TiB和/或TiB_2）和碳化钛（TiC）。通过控制Ti / B_4C的混合比例，可以控制钛基体中反应产物的体积分数。燃烧合成的钛复合材料是多孔的，其孔结构受前驱体的加工条件（孔隙度和Ti / B_4C混合比）的强烈影响。 Ti / B_4C比小且前驱体孔隙率高，开孔率高，而闭孔结构呈Ti / B_4C比高球状。通过改变燃烧温度，孔壁尺寸从几十微米变化到约500微米。

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