FD4N type Silicon Nitride (LED fluorescent powder)

FD4N is a kind of product with high content of silicon. At the same time the other elements expect for silicon are highly controlled. It could be used as mould release agent for quartz crucible, LED fluorescent powder, Photovoltaic Products and other high-tech industry.

Name

α-Si3N4

Free-Si

Fe

B

P

FD4N

≥99.99%

<0.05%

<0.001%

≤4ppm

<5ppm

Purity classification:FD4N

Typical particle size: D50:0.4-0.6

Characteristics: thermo stable, Corrosion Resisting, chemical stability and good Abrasive resistance. The expansion coefficient is small, thermo conductivity good, good strength and toughness and good performance of oxidation under high temperature. The color is white, poison less, high content of α and narrow distribution of particle size.

Main application

Model release agent for quartz crucible, LEDfluorescent powder and photovoltaic Products.

Main industry

High tech industry like LED fluorescent powder and photovoltaic Products

With the increasing shortage of oil, coal and other energy, especially after the crisis of nuclear power, photovoltaic power generation is the most promising green energy. It is not only to replace some conventional energy but also would be the major kind of future energy. The fundamental element for photovoltaic power is poly silicon battery plate. FD4N high purity silicon nitrite is the basic material for poly silicon. Our FD4N product is worldly well reputed.

Silicon nitrite could also be used for thin film solar cell. After being filmed with silicon nitrite in way of PECVD, the film solar cell could not only work as antireflective film to reduce reflection of incident light, further more during the sedimentation of silicon nitrite film, the hydrogen atom go into the film and the silicon plates which could helps to reduce the defects.

silicon nitride structure:

With formula of Si3N4, silicon nitride is a kind of important structural ceramics. It is a super-hard substance and is featured with lubricity and abrasion resistance. Silicon is atomic crystal.

On the top and bottom of a octahedral there is a silicon atom respectively, then four nitrogen  lays on the four corners respectively of the central plane of he octahedral, On the central point of this central plane there is a silicon. Make sure there’s a chemical bond linking four nitrogen with one silicon and one nitrogen linking to three silicon. There’s no link between two nitrogens.

 

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