添加B2O3以改善SnO-MgO-P2O5低溫封合玻璃之特性

Addition of B2O3 to improve the characteristics of SnO-MgO-P2O5 low-temperature-sealing glasses

謝建俊(Chien-Chun Hsieh)

指導教授 ： 徐錦志

大同大學/工程學院/材料工程學系所/碩士(2007年)

摘要

以往商用低溫封合/接合玻璃成份中大多含有高量的鉛，但鉛造成有害人體及環境之影響，因此必須尋求無鉛之低溫封合材料以取代現有含鉛材料。目前研究低溫封合材料已轉向磷酸鹽系玻璃，因其有較低熔融溫度，較能符合封合/接合玻璃特性的要求。
但是目前研究之磷酸鹽玻璃系統主要有化學耐蝕性不佳及熱膨脹係數略高於商用低溫封合/結合玻璃的缺點，並具有快速結晶傾向的特性。本研究在60SnO-10MgO-30P2O5 (mol%) 低溫封合玻璃系統中，添加B2O3，改善玻璃缺點。
研究發現，隨B2O3的添加量增加，B3+可取代磷酸鹽中的部分PO43-四面體中心位置，產生 [BPO4]結構。增加B2O3的添加量，可使玻璃腐蝕速率及玻璃結晶性下降，但卻使玻璃黏度上升。當B2O3添加量為0-3 mol%，CTE變化不大 (115-117×10-7 /℃)；添加量增為4 mol%時，CTE出現極小值 (106×10-7 /℃)；添加量增至5-6 mol%，CTE上升至110 ×10-7/℃。另外，添加B2O3，可以擴大玻璃粉體的燒結溫度範圍。就目前結果顯示，添加B2O3，可以提高SnO-MgO-P2O5玻璃的應用價值。

關鍵字

磷酸鹽玻璃 ； 封合接合

並列摘要

The conventional low-melting sealing/soldering glasses usually contain large amounts of lead, resulting in deleterious health and environmental effects. As a result, it is important to explore lead-free low-melting sealing/soldering glasses. Phosphate glasses have low viscosities, and thus are possible alternatives to lead glasses. The major shortcomings of phosphate glasses are their poor chemical durability, high thermal-expansion coefficient (CTE), and high crystallizbility. The main objective of the present study is to improve the properties of a low-viscosity 60SnO-10MgO-30P2O5 (mol%) glass by adding 0-6 mol% of B2O3 to the glass composition.
It was found in the present study that the addition of B2O3 promoted the conversion of PO43- unit to BPO4 unit. The addition of B2O3 improved the chemical durability of the glass, suppressed the glass crystallizbility, while increased the glass viscosity. The CTE of the glass is in the range of 106 to 117 × 10-7 K-1, with the minimum value of 106 × 10-7 K-1 when the B2O3 content is 4 mol%. The addition of B2O3 increased the temperature range of sintering for the powders compacts. According to the present experimental results, adding appropriate amounts of B2O3 glass composition is benefit to the application potential of the SnO-MgO-P2O5 glasses.

並列關鍵字

phosphate glasses ； sealing/soldering

參考文獻

[5] C.J. Quinn, “Zinc Phosphate Glass Compositions,”PCT Patent WO02057195 A1 (2002) .

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[4] T. Yamanaka, “Lead-Free Tin Silicate- Phosphate Glass and Sealing Material Containing The Same,” US Patent 20020019303 A1 (2002).

[6] P.H. Larsen, F.W. Poulsen, and R.W. Berg, “The Influence of SiO2 Addition to 2MgO-Al2O3-3.3P2O5 Glass,” J. Non-Cryst. Solids, 244, 16-24 (1999) .