玻璃熱壓模具鍍膜之研究

Abstract

玻璃熱壓成形技術是光學玻璃元件重要的製程方式，具有能大量製造和降低製作成本等優點。但在模造過程中玻璃常與模具發生沾黏，以致發生成品良率不佳和模具損壞的問題。為了解決上述的問題，一般都會在模具鍍上Pt-Ir薄膜和DLC薄膜等，或是抗沾黏材料WC、SiC、GC等製作模仁，但兩者的成本較高且製作困難。另外在玻璃與薄膜沾黏的部份，在目前搜尋的文獻中暫無明確證據顯示玻璃沾黏與薄膜表面自由能的關係。因此本研究通過參考文獻嘗試製作出成本較低，並在熱壓後不會與玻璃發生沾黏的鍍膜層，並期望利用薄膜的固體表面自由能，能有效地判斷薄膜在熱壓前與玻璃沾黏行為。 本研究進行中先成功地製作出抗沾黏CrN與SiN薄膜，並對其進行固體表面自由能後的計算，接着再進行玻璃接觸與玻璃熱壓實驗，證實了當薄膜的固體表面自由能越低且薄膜的熱穩定性越好時，薄膜與玻璃發生沾黏的機會越少。

Glass hot embossing is an important technique for optical elements fabrication in recent years. It is generally used to manufacture optical lenses with the advantages of low-cost and steady quality. In the molding process, glass is often sticking with mold and that will make mold damage and poor product yield. In generally some materials like Pt-Ir and DLC films can be coated on the mold surface or hardened alloys such as WC, SiC, GC can be used to make the mold to solve the sticking problems, but both solutions suffer from high cost and manufacture difficulties, also, from research on related litenatures, there are no evidence that show the relationship between glass sticking and the surface free energy of coated materials. Therefore, this research tries to use coating materials with lower cost for the non-sticking coating for glass hot embossing, and also expects to verify if the surface free energy method can be used to effectively determine the sticking behavior of the glass and films before the hot embossing process. In the beginning of this research, non-sticking coatings with CrN and SiN were successfully made. After that, the surface free energy of the films were calculated and both the glass contact and glass hot embossing experiments were conducted. Experimental results showed that, the lower surface free energy and the better the thermal stability of the films, the less sticking was found between the films and glass.