Liquid metal is a mixture of positive ion fluid and free electron gas. Liquid metal is an amorphous, fluid metal.
Among the elemental substances, only mercury is a liquid metal, and gallium / gadolin / cesium is a low melting metal.
Liquid metal gallium dispensing
Gallium is a raw material for optical glass, vacuum tubes, and semiconductors because its liquid temperature range is wide (melting point 29.8 ° C, boiling 2403 ° C), which can be used to make high temperature thermometers. The usage of metal gallium is closely related to the low-carbon economy and green energy development advocated by the current world economic development. Besides gallium is widely used in high-tech industries of modern technology.
In view of the importance of metal gallium, more and more enterprises are devoted to the development of gallium products. At present, the consumption fields of metal gallium in China include semiconductors and optoelectronic materials, solar cells, magnetic materials, petrochemicals, medical equipment, new alloys, etc. Among them, the semiconductor industry has become the largest consumer area of gallium, accounting for about 80% of total consumption.
With the rapid development of the gallium industry, especially the semiconductor & solar cell industries. and the promotion of the development plan of the LED industry by the Chinese government, the metal gallium market will face greater opportunities. According to EU forecasts, it will be shown in the next 10 to 20 years. Global consumption of metal gallium will quadruple.
The density of gallium (20 ° C) is 5.91g / cm³. because of its high density, If the selected metering capacity is slightly different when it is dispensed, the symmetry weight will have a large difference. Gallium becomes a silver-white liquid at 29.8 ° C. Gallium can wet glass, so it should not be stored in glass containers.Gallium can corrode metals, and it should not be in contact with any metal during the process of dispensing liquid gallium. In summary,Dispensing gallium requires high accuracy & consistency,corrosion resistance and sealing well pump.otherwise it is easy to oxidize.
Adding Mercury to projector bulbs.
Recently, projectors have become more and more widely used in our daily life.
Chinese domestic projector market demand shows a diversified development trend, which involves in IT electronics industry, culture & entertainment industry, finance, insurance and securities industry, Education, government and the military. According to the survey results of Projection Window, the sales of Chinese projectors will continue to grow at a rate of more than 10% per year in the future. Production and sales of projectors have gradually increased,which increases in demand for parts and consumables. Bulb is the most consumable part of a projector. At present, Projector bulb can be divided into the following types: xenon bulbs; LED bulbs; metal halide bulbs; UHE bulbs; UHP bulbs.
Xenon bulb is a kind of light source that uses the arc generated by the discharge between the positive and negative electrodes. Due to its high price, it is currently only used in high-end projectors.
The main significance of the application of LED light sources in projectors is to create a new path for miniaturization of the projector. At present, LED light sources are mainly integrate with small projection originals and miniature projection products.
Metal halide bulbs (high-intensity UV halogen lamps) “iron lamps” is generally applied to a large LCD projector because of its low price. The disadvantage is shorter life. At present, metal halide bulbs have gradually withdrawn from the domestic projector bulb market and replaced by cold light source high-pressure mercury bulbs.
UHE (Ultra High Performance )bulbs belong to the category of ultra-high pressure mercury bulbs, which are more suitable for long-term use, and their prices are also moderate. The most prominent feature is that long-life UHE bulbs not only have twice usage time than metal halide bulbs, but also have a smooth performance curve, high brightness, and no significant change in brightness over time.
UHP Bulb is a kind of ultra-high pressure mercury bulbs. Their long life span is generally 6000 hours nominal, and the longest is even 12,000 hours. UHP is a patented technology of Philips company.UHP bulbs Light-an ideal cold light source is now commonly used in front-projection projectors and DLP rear-projection splicing walls. Due to the high price, it is generally used in high-end projectors.
Mercury (Hg, element 80) with a melting point of -38.87 ° C, a boiling point of 356.6 ° C, and a density of 13.59 g / cm3. It is the only metal that exists in a liquid state at normal temperature and pressure (in a strict sense, gallium (Ga, element 31) and cesium (Cs, element 55)) also show room temperature (29.76 ℃ and 28.44 ℃) Liquid). Mercury is a silvery white shiny heavy liquid with stable chemical properties. It is insoluble in acids and alkalis. Evaporates at room temperature, and most of the mercury vapor and mercury compounds are highly toxic (chronic).
The addition of mercury to the projector bulb is very small, usually around 20mg. When dispensing liquid mercury, it requires requires high accuracy & consistency,corrosion resistance and sealing well pump.