Lead-free low-melting-point glass with excellent comprehensive performance and application method thereof

Abstract

The invention relates to a lead-free low-melting-point glass with an excellent comprehensive performance and an application method thereof. The oxide composition of the glass material is expressed as follows in molar percentage: 10-43% of ZnO, 9-20% of Fe2O3, 35-50% of P2O5, 0-6% of Al2O3, 0-10% of B2O3, 0-10% of SiO2, 0-7% of Bi2O3, 0-20% of Na2O, 0-20% of K2O, 0-15% of Li2O and 0-10% of MO, wherein MO is one or more of MgO, CaO, SrO and BaO, the sum of the molar percentages of ZnO, Fe2O3 and P2O5 is not less than 70%, the mixing sum of the molar percentages of alkali metal oxides, and the mixing sum of the molar percentages of alkali metals and alkaline-earth metals are both not greater than 20%. The lead-free low-melting-point glass prepared by the method disclosed by the invention is excellent in comprehensive performance, low in production cost, environment-friendly, and capable of sealing among glass, ceramics and metals, preparing electronic pastes, safely curing high-level wastes, and the like.

Description

technical field [0001] The invention relates to a lead-free low-melting glass with excellent comprehensive performance and its application, in particular to a low-cost, low-oxide composition, environmental protection, low melting temperature, low transition temperature, and wide adjustable thermal expansion coefficient A glass material with excellent properties such as high chemical stability and high thermal stability and an application method thereof belong to the technical field of glass production. Background technique [0002] Low-melting point glass can be used for sealing between glass, ceramics, metal and other materials, and is the basic material for insulation and sealing in the electronics industry. In addition, the low-melting point glass is also an important part of the preparation of electronic paste, which plays a role in bonding and reducing the sintering temperature during the sintering process of the paste. At present, most of the low-melting-point glasses...

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Problems solved by technology

However, the practical application of this material still has the following problems: ① The raw material SnO is expensive and used in a large amount (usually higher than 50mol%), and the glass production cost is relatively high

②The thermal expansion coefficient of this material is relatively high, and a large amount of filler needs to be added when it is used for sealing, and the addition of filler will affect the sealing performance of the sealing parts

③ Both the melting process and sealing process of phosphate glass with high SnO content require a reducing or protective atmosphere. The glass preparation and sealing process is complex, and the complex process is likely to cause unstable performance of the glass product, which is not conducive to industrial application

40Fe 2 o 3 -60P 2 o 5 The chemical stability of the base glass reaches or exceeds that of the commercial lead-based glass, but the transition temperature of the glass is higher (T g >500℃), which seriously limits its practical sealing application (Journal of Non-Crystalline Solids, 2001, 292(1-3): 150-157)

Its disadvantage is poor thermal stability (T c -T g <100°C), the melting temperature of glass is higher (usually higher than 1250°C), which is not conducive to the long-term safe curing of high-level radioactive waste (Materials Research Bulletin, 2006, 41(9):1622-1630)

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