Low-softening-temperature leadless glass powder for bonding, preparation method and application thereof

Abstract

The invention provides a low-softening-temperature leadless glass powder for bonding, a preparation method and an application thereof. The low-softening-temperature leadless glass powder comprises the following compoents of: by weight, 45-83% of P2O5, 1-20% of B2O3, 1-10% of MnO, 1-5% of Fe2O3, 1-15% of BaO, 1-15% of CaO, 1-5% of CuO, 5-25% of Na2O, 0.1-2% of CoO, 0.1-2% of NiO and 0.1-5% of rare earth oxide. The preparation method comprises the following steps of: fully mixing all the raw materials, putting the mixture into a crucible, fusing at 800-1000 DEG C in an electric furnace for 1-2 hours, pouring glass metal into a tablet press to be pressed into slices, carrying out ball milling, and sieving. The low-softening-temperature leadless glass binder provided by the invention can be used in a high-temperature billet protective coating. Spraying of the coating at 600-850 DEG C can be realized, and the protective coating can be formed instantly. During the whole heating process, corrosivity of billet is low.

Description

technical field [0001] The invention relates to the field of low-softening-temperature glass, in particular to a low-softening-temperature lead-free glass binder capable of instantaneously adhering materials to the surface of a high-temperature billet substrate at 600-850°C, and a preparation method and use thereof. Background technique [0002] The softening temperature of low softening temperature glass powder is generally lower than 800 ° C. Many lead-free and environmentally friendly low softening temperature lead-free glasses have been developed. The systems are basically phosphate systems, borate systems and bismuth systems. They are widely used Fillers and binders for sealing and high-temperature coatings in the fields of vacuum technology and electronic technology. At present, there are still many problems in the use of low softening temperature lead-free glass as a binder. For example, in the instant adhesion of the material to the surface of the high-temperature bi...

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Problems solved by technology

At present, there are still many problems in the use of low softening temperature lead-free glass as a binder. For example, in the instant adhesion of the material to the surface of the high-temperature billet substrate at 600-850 ° C, there are the following problems: the adhesion of the single glass powder is slightly poor, Generally, it needs to be compounded with other inorganic binders; the chemical stability is poor, which is not conducive to long-term storage; the low softening temperature lead-free glass powder is immature in controlling the side effects of high-temperature billets at 1000-1300 °C, which limits low-temperature The use of softening temperature glass as a high-temperature binder, in particular, limits the development of temporary protective coatings that can be instantly formed under high-temperature heat treatment at around 800 °C in the billet continuous casting and rolling process

[0003] Qiu Shuheng and others studied a low softening temperature inorganic adhesive, the main components are waste glass powder, B 2 o 3 , ZnO, P 2 o 5 and other oxides as raw materials to obtain lead-free environmentally friendly glass with low softening temperature. The glass structure is mainly borate network. Under the activity will lead to its corrosion of the steel substrate

[0004] Chinese patent CN 101462858A discloses a kind of high-temperature steel parts marking inorganic coating, wherein binder is the mixture of low-temperature lead-free glass powder and water glass, and this lead-free glass powder is made of P 2 o 5 , B 2 o 3 , ZnO, Na 2 Composed of O, although this high-temperature binder can enable inorganic coatings to mark steel parts at high temperatures, the glass powder and water glass in it are very corrosive to the steel billet substrate at 1000-1300 ° C, so this This kind of glass powder cannot be used in the temporary protective coating of high temperature heat treatment in the billet continuous casting and rolling process

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