黃坤祥2006-07-252018-06-282006-07-252018-06-282000http://ntur.lib.ntu.edu.tw//handle/246246/12372粉末射出成形製程對具複雜形狀之零件具有極佳的成形能力，但由於整個製程之尺寸收縮高達12-20%，其製品的尺寸穩定性不如傳統粉末冶金容易控制。在射出成形製程中，每一個步驟對產品的最終尺寸穩定性皆有影響，但以脫脂(包括溶劑脫脂與熱脫脂)及燒結步驟最為重要。 本計畫延續申請人之前的研究，對於射出件在熱脫脂與燒結過程中的尺寸變化情形與變形行為作更深入的探討，特別是在黏結劑含量及燒結方面。實驗利用雷射膨脹儀及熱膨脹儀分析溶劑脫脂、熱脫脂與燒結過程中試片的尺寸變化，結果顯示7%之黏結劑較6.5%及8%者為佳，而燒結時經過相變態者較差，此外，試片若厚薄不均將造成變形，主黏結劑未達30%、脫脂溫度超過45℃時其尺寸穩定均不佳。熱脫脂時在氫氣氣氛下易因滲碳而變形，宜採低升溫速率、真空或惰性氣體。The major advantage of the powder injection molding process is its ability to produce net or near net shaped components with good mechanical properties. However, the dimensional control of PIM compacts has been the most critical hindrances of the further growth of this technology. This problem occurs mostly during the debinding and sintering processes. This study uses the laser and thermal dilatometers to analyze the in-situ length change during debinding and sintering. The emphasis was on the binder content and processing parameters. The results show that the 7% binder was the best compared to the 6.5% and the 8% binder systems. The major binder content should be no less than 30% when the repeatability of the dimension is required. The uneven crosssection thickness in the compact, high solvent debinding temperature greater than 45℃, and hydrogen atmosphere were also shown to be the causes of distortion. With these data, the mechanism of the expansion and distortion are analyzed and suggestion on the process and the required material characteristics are presented.application/pdf86793 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學研究所粉末射出成形尺寸穩定性熱脫脂in-situ 脫脂行為變形powder injection moldingdefectsdistortiondimensional controlreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12372/1/892216E002022.pdf