The High Speed Centrifugal Compaction of Submicron Ceramic Powder in Fusible Alloy Die
The High Speed Centrifugal Compaction of Submicron Ceramic Powder in Fusible Alloy Die
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亚微米陶瓷粉末在易熔合金模具中的高速离心压实
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
H. Kuroki
中科院分区：
文献类型：
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作者：
S. Tashima;Shinichi Hori;H. Kuroki
制造复杂形状的精细陶瓷产品所需的技术包括用小于1μm的细粉末形成均匀且高密度的压坯。为了实现这一目标，作者开发了一种高速离心压实工艺，该工艺对金属模具中的陶瓷粉末粉浆施加 10k-20kG 的离心力。该过程提供了比以前的技术更快的压实速度，但没有污染。本研究涉及该过程的提取方法。将氧化铝粉浆装入使用易熔合金制造的硬壳式模具中，从而具有高屈服比且对产品形状没有限制。离心压实后，模具被熔化并取出压坯。由于在模具熔化后压坯和金属变湿时压坯会被污染，因此设计了一种用薄的可膨胀膜将模具和压坯隔开的方法。该技术使得可以在大气中在 1250°C 的低温下烧结来生产纯压坯。
The technology required to make fine ceramic products with complex shapes involves forming uniform and high-density compacts with fine powders of less than 1μm. To achieve this, a high speed centrifugal compaction process has been developed by the authors that applies a centrifugal force of 10k-20kG to a slip of ceramic powder in a metal die. This process offers a faster compaction rate than that of previous techniques but with no contamination.The present study concerns an extraction method for this process. An alumina slip is loaded in a monocoque die manufactured using a fusible alloy, that places a high yield ratio and no restrictions on product shape. After centrifugal compaction, the die is melted and the compact extracted. Since the compact would be contaminated when the compact and metal become wet after the die is melted, a method in which a thin expandable film separates the die and the compact is contrived. This technique makes it possible to produce a pure compact with sintering at a low temperature of 1250°C in the atmosphere.