在金屬粉末射出成形過程中，脫脂的步驟影響很大，主要原因是在於其過程極為耗時，和脫脂不當會導致成品易產生損壞。故為限制整個金屬射出成型產能的主要關鍵。 本研究以三維毛細吸附脫脂實驗為主使用金屬粉末而非鋼珠模擬以接近實際脫脂情形；做一吸附實驗，以空孔度、胚體厚度、脫脂溫度、不同吸附材粉末粒徑、不同胚體粉末粒徑為變因，探討這些變因對脫脂百分比的影響性，得到配合小胚體厚度和吸附材粉末粒徑要小，胚體粉末粒徑要大或是高胚體空孔度，以及適當的脫脂溫度可得到較快的脫脂百分比以及脫脂過程中無因次參數的變化加以分析，可知毛細力為主導吸附脫脂的主要力量，其次推導出一套符合本實驗中二維吸附部分的數值模擬，以探討理想的狀況下，胚體的脫脂百分比與脫脂時間之間的相互關係。兩者相互比對，可明白在脫脂過程中，理論模擬與實驗操作的差異性。 Among the MIM processes, debinding is the most important and time-consuming step. Failing in this key process always leads to the overall failure of the MIM product. Therefore, it is the key point of the limiting the production rate of the MIM process. To analyze the three dimension of wick debinding process, the influence of five different factors (porosity, compact height, debinding temperature, wick powder size, compact powder size) on the final debinding percentage is investigated. Results show that high porosity compact, small wick powder size, large compact powder size, and appropriate debinding temperature can increase the debinding percentage. By the dimensionless analysis of the parameters in debinding process, the capillary force is found to be the main driving force in the wick debinding. Furthermore, a mathematic of model is derived to simulate the idealized, two-dimensional debinding process, and the debinding percentage versus debinding time is calculated. The difference between simulation and experiment is compared and analyzed.
