Glass for sealing with metal or alloy

Abstract

The invention relates to a glass for sealing with metal or alloy, wherein the mol ratio of its constituents being, 70.0% to 80.0% of silicon oxide, 0.0% to 4.0% of aluminium oxide, 12.0% to 19.0% of boron oxide, 0.0% to 4.0% of lithium oxide, 0.0% to 6.0% of sodium oxide, 0.0% to 8.0% of potassium oxide, 0.0% to 6.0% of magnesium oxide, 0.0% to 6.0% of calcium oxide, 0.0% to 6.0% of strontium oxide, 0.0% to 6.0% of barium oxide, 0.0% to 6.0% of zinc oxide, 0.0% to 6.0% of arsenic trioxide, 0.0% to 1.0% of cerium oxide. The glass has similar expansion coefficient, low air bubble generating number and low glass liquid phase temperature with the sealing metal.

Description

technical field [0001] The invention relates to a glass for sealing with metal or alloy, in particular to glass for sealing with metals such as tungsten (W), molybdenum (Mo) and alloys with similar properties, and can be applied to glass tubes of fluorescent lamps. Background technique [0002] Generally speaking, there are many materials for glass sealing, including various metals, alloys, ceramics and crystallized glass, among which the most used is the sealing of glass and metal. The history of glass and metal sealing has a long history. As early as the 1820s, some people carried out sealing experiments between platinum and soft glass. Today, glass sealing has become an indispensable technology for the manufacture of various high-quality electric light sources such as fluorescent lamps, electron tubes and other electric vacuum devices, especially fluorescent tubes used as backlight sources for liquid crystal displays (LCD). In addition, with the trend of thinner, lighter...

AI Technical Summary

Problems solved by technology

The packaging glass disclosed in Japanese Patent Laid-Open No. 2002-187734 suffers from excessive air bubbles during sealing, which will affect the airtightness of the sealing.

Japanese Patent Laid-Open No. 2001-220175 and Chinese Patent Announcement CN1339016A, when sealing according to the glass composition disclosed in the patent, lead oxide and antimony oxide are contained, which will cause instability in the production process and lead pollution to the environment. Circumstances that cause blackening of the glass during the sealing process

The glass composition disclosed in U.S. Patent 5,747,399 has an excessively high liquidus temperature and increased crystallization, resulting in devitrification, and the presence of lead oxide causes instability in the production process and lead pollution to the environment

When the glass composition disclosed in Chinese patent announcement CN1350989A is used for sealing, it is not suitable for sealing with tungsten, molybdenum and alloys with similar properties because of its high expansion coefficient.