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

A technology with low melting point glass and comprehensive performance, applied in the field of lead-free low melting point glass and glass materials, can solve the problems of limited sealing applications, high thermal expansion coefficient, high glass melting temperature, etc., achieve broad market development prospects, and simple preparation method , excellent overall performance

Active Publication Date: 2015-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1

[0029] The glass of embodiment 1 is used as sealing glass, then thermal stability and chemical stability can all meet the requirements, but its transition temperature is slightly higher and unfavorable for sealing application; If this glass is used to solidify high-level radioactive waste, then chemical stability is far from being able to meet the requirements. Meet the requirements, not up to the existing 40Fe 2 o 3 -60P 2 o 5 glass level. Therefore we have studied Bi on the basis of embodiment 1 again afterwards 2 o 3 and MoO 3 Effect of doping on its performance. Mix 10mol% Bi in the proportioning of embodiment 1 2 o 3 Can not be glass; mixed with a small amount of Bi 2 o 3 The chemical stability of the prepared glass of Examples 6 and 7 is sharply improved, and the change in transition temperature is small; the addition of 5mol% MoO 3 The thermal stability of the prepared glass is significantly improved, but the chemical stability is reduced instead. Therefore,...

Embodiment 6

[0030] Though embodiment 6 and 7 glass have high chemical stability and high thermal stability, its T g There is still a certain distance from the target value of 400°C. After slightly adjusting the composition of the glass in Example 6, we tried to pass Na 2 O doping to lower the transition temperature of the glass. Formulated (30-x)ZnO-10Fe 2 o 3 -50P 2 o 5 -5Al 2 o 3 -5Bi 2 o 3 -xNa 2 Among the six formulations of O(x=0,5,10,15,20,30), glass cannot be prepared when x=30, and glass performance is better when x=15 and 20, corresponding to Example 8 in Table 1 respectively and 9. Compared with embodiment 6, the thermostability and chemical stability of embodiment 8 and 9 change little, but T g value has decreased significantly.

[0031] On the basis of Example 9, we also use the mixed alkali effect to regulate the performance of the glass, respectively studied the K 2 O-Na 2 O and Li 2 O-Na 2 O mixed base effect. Prepared 10ZnO-10Fe 2 o 3 -50P 2 o 5 -5Al ...

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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...

Claims

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Application Information

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IPC IPC(8): C03C3/062C03C3/066C03C3/16C03C3/19C03C4/00
Inventor 李秀英卢安贤杨华明朱立刚刘飘罗志伟
Owner CENT SOUTH UNIV
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