化學強化玻璃劃線切割研究

Abstract

化學強化玻璃在玻璃表面有一層離子交換產生的壓應力層，使得玻璃強化後具有較高的強度和抗刮、抗腐蝕等特性，但也造成化學強化玻璃在劃線上的難度較素玻璃提高了不少，特別是強化深度23 μm以上的強化玻璃更都沒有一個好的劃線方法。本研究提出了一強化玻璃劃線理論，探討了三種不同強化深度(10 μm、 23 μm、40 μm)的化學強化玻璃劃線性質。並針對三種不同強化程度的玻璃提出劃線策略。在強化深度10 μm的強化玻璃劃線上，利用一般標準型刀輪，就可成功劃線，並且劃線後維持良好的玻璃表面及截面狀況。而強化深度23 μm的玻璃，一般劃線已無法有效地將玻璃劃開，加入振動輔助劃線，以方波搭配低頻率和低振幅的情況下能將玻璃成功劃開並且劃線後依舊能有良好的玻璃表面及截面狀況。在強化深度40 μm的強化玻璃劃線研究中，劃線後玻璃十分容易產生側向裂紋，造成玻璃表面會產生大量的表面微崩落，但利用角度很小115 ˚的刀輪在高刀輪負荷下，利用表面微崩落造成強化層的剝落，可成功將強化深度40 μm的強化玻璃劃開。而搭配振動輔助後，以方波搭配低振幅在頻率400 Hz時能成功將表面微崩落的情形改善。

Ion-exchange processing produce a compressive stress profile in glass surface and this kind of glass is called chemically strengthened glass or ion-exchanged glass. Residual compressive stress increase the glass strength, crack and scratch resistance, but also cause chemically strengthened glass is more difficult to scribe, especially the glass with depth of layer more than 23 μm. In this study, scribing three different kinds of chemically strengthened glass (depth of layer 10 μm, 23 μm, 40 μm) are discussed. For chemically strengthened glass with depth of layer 10 μm, glass can be successfully separated with standard scribing wheel and still maintain good surface and cross-section condition after scribing. On scribing depth of layer 23 μm glass, traditional scribing is unable to effectively separate the glass. By adding vibration assisted, glass can be successfully separated and with good surface and cross-section condition in the case of square wave form, low frequency and low amplitude. Scribing chemically strengthened glass with depth of layer 40 μm, lateral crack will generate very easily, causing seriously chipping. Scribing with wheel angle 115˚ and high loading can successfully induce the glass separated because heavily chipping cause compressive layer in the glass surface dropping off. Vibration assisted scribing can successfully improve surface chipping on the condition of square wave form, low amplitude, and frequency of 400 Hz.