Improvement of rheological properties of Inconel 718 MIM feedstock using tailored particle size distributions
Improvement of rheological properties of Inconel 718 MIM feedstock using tailored particle size distributions
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DOI：
10.1179/174329008x313342
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发表时间：
2008-06
影响因子：
1.4
通讯作者：
J. M. Contreras;A. Jiménez-Morales;J. M. Torralba
中科院分区：
文献类型：
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作者：
J. M. Contreras;A. Jiménez-Morales;J. M. Torralba
金属注射成型（MIM）工艺中最重要的阶段之一是原料制造，因为原料的流变性能在注射成型步骤中至关重要。在本工作中，用不同粒度范围的粉末混合物代替常规MIM高温合金原料（粒度<20 μm）以定制流动性能的可能性进行了研究。用相同的粘合剂（HDPE-石蜡-硬脂酸）和四种球形气体雾化粉末组分（<22; 16-45; 45-63; 65-212 μm）的不同混合物制备了五种Inconel 718原料。用毛细管流变仪测定了每种原料的流动指数、屈服应力和活化能。
One of the most important stages in the metal injection moulding (MIM) process is feedstock fabrication, since the rheological properties of the feedstock are of crucial importance in the injection moulding step. In the present work, the possibility of replacing a conventional MIM superalloy feedstock (particle size <20 μm) by a mixture of powders with different particle size ranges, to tailor the flow properties, was investigated. Five Inconel 718 feedstocks were prepared with the same binder (HDPE–paraffin wax–stearic acid) and different mixes of four spherical gas atomised powder fractions (<22; 16–45; 45–63; 65–212 μm). The rheological characteristics and processability of each feedstock were evaluated with a capillary rheometer to determine flow index, yield stress and activation energy.