Development of High-Speed Centrifugal Compaction Process Using Fine Metallic Powders

在本研究中，我们开发和改进了高速离心压实工艺的各个步骤(浆料的制备、压制条件、烧结条件等)。将粒度小于5微米的不锈钢、高速钢和Inconel合金粉末加工成非水泥浆，用高速离心机压实并在固态下烧结到接近全密度。将直径为0.1微米的超细WC粉末在高能磨机上加工成非水浆料，最后在没有烧结助剂的情况下烧结到接近全密度。建立了分体式模具设计技术。带拔模和O形环的模具适用于高速离心机成形复杂形状的模具。事实证明，科里奥利力是压制过程中引入的不均匀的原因。改进压实步骤可将不均匀降至最低。

In the present study, we have developed and improved each process step (preparation of slurries, compacting conditions, sintering conditions, etc) of high speed centrifugal compaction process (HCP).Powders of stainless steel, high-speed steel and Inconel alloy under 5 micrometers in particle sizes have been processed into nonaqueous slurries, compacted by a high-speed centrifuge and sintered to nearly full density in solid state.A super fine WC powder with particle diameter of 0.1 micrometer has been processed into nonaqueous slurry by a high-energy mill and finally sintered to a nearly full density with no sintering aid.Design technologies for split molds have been established. The molds with a draft and O-rings are applicable to form complicated configurations by high-speed centrifuges.The Coriolis' force has proved to be a cause of inhomogeneity introduced during compaction. Improving the steps of the compaction minimizes the inhomogeneity.