無鉛膠材燒結條件的統計分析

Abstract

近年來職業病的發生屢出不窮，國人對於職業病的預防意識也漸漸興起，加上目前大部分的企業也都落實歐盟的RoHS指令，大幅的降低了勞工在製造過程中接觸或曝露在有害物質的環境中，也可以確保購買的消費者在使用時不會暴露在有害物質的環境中。由於台灣近幾年的RoHS興起，趨使電子元件封裝所使用的黏著膠材必須要把含鉛替換成無鉛膠材，其中黏著膠材所使的熱處理方法會因 膠材成分的差異而有所不同。本研究以被動元件廠所使用的黏著膠材為案例，以田口實驗設計法找出含鉛及無鉛膠材之燒結條件，並以可靠度實驗予以佐證，此方法既可篩選出符合歐盟規定又可讓品質達到客戶之需求。從數據分析的結果得知，含鉛膠材在短期可靠度試驗中，拉力、折彎及跌落測試的影響為最大且呈正相關，但在長期可靠度試驗中，溫度衝擊試驗的電阻值的變化率影響較大；無鉛膠材則對短期可靠度試驗影響較小，但在長期可靠度試驗中，壓力鍋測試與長期耐濕測試的電阻值變化率影響較大。

In recent years, public events with respect to occupational hazards have been occurring frequently in many working places in Taiwan, and the prevention of the threat has raised a large concern. To reduce the occupational risk and protect both the workers and users from exposing toxic substances, many companies follow the Restriction of Hazardous Substances (RoHS) directives to develop and manufacture their products. According to the directives, conventionally lead-containing adhesives have to be replaced with lead-free substitutes for electronic packaging. Sintering plays a crucial role in the function of the adhesives. However, the optimal conditions for the lead-free substitutes to perform the acceptable credibility have not been studied and compared yet. This study will use the Taguchi method to optimize the sintering conditions for both lead and lead-free adhesive materials, and their adhesion strength will be evaluated through a series of reliability tests. The results of short term test show that the lead-containing material exhibited better performance than the substitutes in tensile, bending, and drop tests, and show positive correction with lead adhesive, but the results of long term test that the resistance of thermal shock test is larger than lead-containing material. The results of short term test show that the lead-free containing material exhibited poorer performance than the results of long term test, and the results of long term test better performance than the substitutes in the test of steam digester and Highly-Accelerated Temperature and Humidity Stress test.