Manufacturing technology and performance testing of metallic micro-sized components
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摘要: 研究了粉末微注射成形技術制備純鐵微型齒輪.采用平均粒度為2.3μm的羰基鐵粉和石蠟基熱塑性粘結劑體系,當粉末的裝載量(體積分數)為58%時,獲得了形狀良好的齒頂圓直徑為700μm的微型齒輪注射生坯.燒結后齒形輪廓清晰,中心孔的圓度保持良好,齒輪的齒頂圓的收縮率約為15.6%,齒輪表面的粗糙度為Sa=5.0991μm.Abstract: Micro powder injection molding (μ-PIM) was studied to manufacture micro-sized gearwheels of iron. Carbonyl Fe powder with a mean size of 2.3 μm and wax-based thermoplastic binder mixture were used in the manufacture process. When the powder loading was fixed as 58%, the molded compact of a gearwheel whose addendum circle diameter is 700 μm was obtained with well shape retention. The profile of the gearwheel and the roundness of the centre hole were kept well after sintering. The sintering shrinkage of the addendum circle is 15.6% and the roughness of the gearwheel surface is Sa=5.099 μm.
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