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2.2.7 Sifat Reologi Bahan Suapan
daripada Suri et al. (2003) menunjukkan bahawa masa pencampuran yang lama dapat mengurangkan jumlah serta saiz gumpalan yang terdapat dalam bahan suapan alumina mereka. Ini seterusnya memperbaiki sifat kecekapan padatan bagi serbuk logam dan mengurangkan kelikatan bahan pengikat tersebut.
Parameter pencampuran yang mempengaruhi tahap kehomogenan bahan suapan adalah jenis mesin pencampur dan bebilahnya, halaju dan suhu pencampuran, dan juga turutan prosesnya. Suhu pencampuran dipelbagaikan bergantung kepada jenis bahan suapan yang ingin dicampur, di mana ianya berada di antara julat suhu lebur tertinggi dan suhu penguraian terendah bagi komponen bahan pengikat terlibat. Sebagai contoh, Nutthita et al. (2008) mengadunkan serbuk WC-Co dengan bahan pengikat polietilene glikol (PEG) dan polimetil metakrilat (PMMA) pada suhu 80oC selama satu jam. Suhu ini bersesuaian memandangkan takat lebur bagi PEG adalah 54.3oC manakala suhu penguraian PMMA adalah 170oC. Untuk mengkaji takat lebur dan suhu penguraian bahan pengikat yang digunakan, analisis Imbasan Permeteran Kalori Perbezaan (Differential Scanning Calorimetry, DSC) dan analisis permeteran gravity haba (Thermogravimetric Analysis, TGA) digunakan. Hasil kedua-dua ujian ini dapat memberikan maklumat tepat berkenaan suhu pencampuran yang sesuai digunakan. Selain itu, De Souza et al. (2003) telah mengkaji kesan parameter pencampuran terhadap tahap kehomogenan bahan suapan berasaskan serbuk tungsten. Perbandingan dilakukan antara serbuk diterima (as received) dan dikisar rod dengan bahan pengikat lilin dan polipropelina. Hasilnya mendapati peningkatan kadar ricih semasa pencampuran dapat mengurangkan saiz gumpalan bagi serbuk diterima, seterusnya memperbaiki tahap kehomogenan bahan suapan tersebut. Ternyata serbuk yang dinyahgumpal berupaya menghasilkan beban serbuk yang lebih tinggi pada daya kilas yang rendah.
2.2.7 Sifat Reologi Bahan Suapan
Ciri aliran bahan suapan MIM, atau ciri reologi adalah penting dalam memastikan pengisian dalam kaviti acuan berjalan dengan lancar. Kriteria yang paling penting adalah kelikatan, yang mengaitkan tegasan ricih kepada kadar ricih. Kelikatan bahan suapan yang tinggi akan menyukarkan proses pengacuan (Karatas et al. 2004)
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