CN1974451A - No-lead glass for electronic product - Google Patents

Abstract

The present invention discloses one kind of no-lead glass for electronic product. The no-lead glass consists of SiO2 45-50 %, B2O3 15-20 %, K2O 10-15 %, Na2O 5-10 %, ZnO 10-15 %, and TiO2 5-10 %. The present invention replaces B2O3, Na2O, ZnO, Ti2O, etc for PbO, has relatively low glass softening temperature, and can make the glass casing of electronic product without lead. In addition, B2O3, Na2O, ZnO, Ti2O and other PbO substituent has wide material source and moderate cost.

Description

No-lead glass for electronic product

Technical field

The present invention relates to a kind of no-lead glass for electronic product.

Background technology

Glass has two kinds of high temp glass and low temperature glass, high temp glass, use is purposes such as glass door and window in as family, because of not leaded, softening temperature is 700 ℃～800 ℃, melting temperature is 1400 ℃～1500 ℃, this glass is too high because of softening temperature, be not suitable in the electronic product, especially semi-conductor because of semi-conductor need spread phosphorus and boron (about 700 ℃ of the temperature of diffusion) in process of production, makes its form become positive and negative electrode with special oxide treatment (about 600 ℃) again and becomes diode in the semi-conductor, and change at 700 ℃～800 ℃ because of this high temp glass softening temperature, can destroy diode characteristic as using in diode, so just develop low temperature glass on the market, its softening temperature is at 500 ℃～600 ℃, melting temperature is 1100 ℃～1200 ℃, can use at diode temperature and just not destroy its characteristic.

But, all containing plumbous oxide in the low temperature glass bulb that uses at present, composition is: SiO ₂32%, K ₂O 4%, Al ₂O ₃2%, PbO 62%, mixes above ratio and stirs, and founds through 1200 ℃ again, and diode glass shell technological process of production figure makes the glass shell finished product at last.

According to statistics, in the annual packaged material that uses of global electronic information products 20,000 tons lead is nearly arranged at present.How effectively the plumbous use of restriction has become the important topic that current electronics and information industry must be faced, and environment is human conditions on which persons or things depend for existence, and electronics and information industry is the growth point of global economy, and we are indispensable in these two aspects.Expert introduction is considered based on environmental protection at present, and it is the Environmental policy of guiding that European Union implements with the green product in the past few years one after another with countries such as U.S., days, and long-pending level promotes unleaded relevant criterion and bill.European Union announces to completely forbid in 2006 leaded electronic product input, the U.S. then carries out the research project of unleaded project in conjunction with electronics manufacturer, government, supplier and academic institution etc., Japan is also in the use of estimating to abolish in 2007 lead in the electronic product, China has also announced " the prevention and cure of pollution management methods of electronics and IT products ", everything shows, electronic product is unleaded to have become next step development trend of electronics manufacturing.

Under legislation and the dual driving in market, each link in the electronics manufacturing industry chain without exception be faced with stern challenge, special upstream equipment, the supply of material and components and parts.

Summary of the invention

The present invention seeks to: provide a kind of no-lead glass for electronic product, this glass bulb B ₂O ₃, Na ₂O, ZnO, TiO ₂Deng replacing PbO, can in the lower glass transition temperature of maintenance, realize that the electronic product glass bulb is unleaded.

Technical scheme of the present invention is: a kind of no-lead glass for electronic product comprises following component:

SiO ₂ 45-50％

B ₂O ₃ 15-20％

K ₂O 10-15％

Na ₂O 5-10％

ZnO 10-15％

TiO ₂ 5-10％。

Advantage of the present invention is:

1. the present invention B ₂O ₃, Na ₂O, ZnO, TiO ₂Deng replacing PbO, can in the lower glass transition temperature of maintenance, realize that the electronic product glass bulb is unleaded.

2. the used B of the present invention ₂O ₃, Na ₂O, ZnO, TiO ₂Deng the surrogate of PbO, wide material sources, cost are not high, can be accepted by users.

Below in conjunction with embodiment the present invention is further described:

Embodiment

Embodiment: a kind of no-lead glass for electronic product, adopt following prescription:

SiO ₂ 46％

B ₂O ₃ 17％

K ₂O 12％

Na ₂O 7％

ZnO 12％

TiO ₂ 6％。

Above-mentioned crown glass can be used for making diode glass bulb etc.

Adopt following technology:

------------batching---is founded---glass bulb check---cleaning-drying---glass-tube cutting---glass-tube check---trombone slide moulding---packing warehouse-in---factory inspection---client to formula calculation to chemical analysis to raw material silo in materials procurement.

The present invention has following characteristics:

1, the compound that does not contain Toxic pb and pb in the diode glass bulb, the protection environment.

2, no pb product meets WEEE and two instructions of ROHS, can export the America and Europe.

3, softening temperature: 644 ℃.

4, linear expansivity (20-380 ℃): 90 * 10 ^-6℃.

The present invention B ₂O ₃, Na ₂O, ZnO, TiO ₂Deng replacing PbO, can in the lower glass transition temperature of maintenance, realize that the electronic product glass bulb is unleaded; The B that the present invention is used ₂O ₃, Na ₂O, ZnO, TiO ₂Deng the surrogate of PbO, wide material sources, cost are not high, can be accepted by users.

Claims (1)

1. no-lead glass for electronic product comprises following component:

SiO ₂ 45-50％

B ₂O ₃ 15-20％

K ₂O 10-15％

Na ₂O 5-10％

ZnO 10-15％

TiO ₂ 5-10％。