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Global four companies split the photovoltaic silicon nitride market-Hengyang Kaixin Special Material


In the past ten years, photovoltaic companies have blossomed in China, and the rapid development

has led to the rise of related auxiliary materials. However, few people are concerned about the use of

auxiliary silicon nitride powder in the upstream polysilicon ingot process of PV, but it is in the entire

cast. Ingots are very important.

Photovoltaic silicon nitride powder

The silicon wafer is a leading product of solar cells, and the high-quality silicon ingot is a guarantee of

high-quality silicon wafers. The silicon nitride powder plays an important role in the process of

polysilicon ingot casting. It is sprayed on the inner layer of quartz crucibles, and At the time of mold

release and blocking of the migration of oxygen and other impurity elements from the crucible to the

silicon ingot, the purity of the silicon nitride itself also affects the purity of the ingot, and prevents the

ingot from cracking, producing hidden lines and pores during the ingot casting process. Plays a vital


The reporter learned that at present, China's photovoltaic-grade silicon nitride market is mainly

occupied by four companies, namely Tongli Hi-Tech in Yantai, China, Alzchem, UBE in Japan, and

H.C.Starck in Germany.




Why do four companies see silicon nitride

Yantai Tongli High-Tech was established in 2005 and was mainly engaged in the production and sales of nitride series

ceramics. In 2008, based on its own industrial advantages, the company has positioned itself

precisely to emerging industries and has aimed at the production and sales of photovoltaic grade

high-purity and ultra-pure nitrides. The market share in China so far has exceeded 50%.

AlzChem was founded in 1908 and mass production of silicon nitride began in 1992, but initially the main target customers were also ceramic companies. In 2010, the company formulated a new strategy, and new high-purity silicon nitride for the photovoltaic industry began to be put on the market.

The earliest company that started producing photovoltaic grade silicon nitride was Japan's UBE company. When it was said that the company's silicon nitride business had to mention the leader of the

polysilicon ingot furnace industry - GTSolar, the US company, it was GTSolar's products that were in production. Due to the needs of the time, the special chemical products that would have been costly to dispose of were transformed from negative values into high-quality photovoltaic auxiliary materials of about 2,000 yuan per kilogram, which was regarded as salted fish and began mass production.

According to information, UBE started production of specialty chemical products from the 1930s. The method of application is chemical vapor deposition. According to industry sources, this method is

not an ordinary enterprise can produce, you need to have a small city-size floor space to achieve. That is, a large company such as UBE is involved in the production of

silicon nitride powder because it mainly produces other products. UBE is mainly used as a raw material for the production of silicon nitride ceramics and therefore requires a particularly high level of

a-phase content.

H.C. Starck, a wholly owned subsidiary of the German Bayer Group, is a German silicon nitride company. Founded in 1920, the company's products cover not only high-performance metals but also ceramic powders, components and films. The process for producing

silicon nitride powder is a physical method and is totally different from the chemical method.

H.C.Starck produces more than 800 atomized alloys and pure metal powders for P/M and also

produces sintering additives such as nitrides, carbides and sulphides. Silicon nitride powder is used to make polysilicon solar wafers and LED phosphors.

In terms of market demand, domestic monthly demand is about 20 tons. G5's ingot casting furnace

requires about 400-480g of silicon nitride for each ingot, and G6's furnace requires about 580-650g of silicon nitride per ingot.

In terms of price, silicon nitride has gone through a tortuous path of decline. From the earliest 2,000 yuan/kg to less than 6,700 yuan, the decline has become obvious. Compared with several large

overseas companies, domestic silicon nitride companies adopt independent research and

development equipment for product production, and adopt a “small profits but quick turnover”

model in terms of price, which is more advantageous for quickly occupying the market.

As long as any industry is domesticated, the cost will drop rapidly, and the silicon nitride industry is

no exception. After more than a decade of extensive development of photovoltaics, it has now

reached a point where there is a serious surplus of backward production capacity. It is hoped that

the silicon nitride auxiliary industry will be able to develop in a healthy and orderly manner in

response to market demand.

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