烟台同立高科新材料股份有限公司氮化物产品目前分为三大类：光伏级氮化硅粉、陶瓷级氮化硅粉、氮化铝粉。其中光伏级氮化硅粉用作多晶硅铸锭的脱模剂，喷涂在多晶硅铸锭坩埚内表面，是多晶硅铸锭生产不可或缺的辅材。光伏级氮化硅粉目前是同立高科的拳头产品，市场占有率在60%以上。
光伏级氮化硅粉
同立高科采用特殊的硅粉氮化工艺，合成的光伏级氮化硅粉纯度高，粒度分布窄，铸锭脱模好，硅锭成品率高，技术指标达到世界先进水平，产品品质已经得到多家国内外知名大厂的广泛认可。目前产品的国内市场占有率达60%以上，我们的合作客户有GCL、赛维LDK、天合、晶科、晶澳、海润等，我们为我们的客户提供专业的技术支持。
同立高科非常重视新产品的创新和研发工作，在初期光伏级氮化硅粉（TX-Q）的基础上，进行改进创新并引进新型设备，对产品不断升级，TS和TX-Q型号氮化硅粉的技术指标不断提高，TH -A产品的铁含量可达到≤5ppm，并且在市场的推动下，我公司的TS系列产品已实现大批量供应。
另外，同立高科还可根据客户需求通过工艺调整对光伏级氮化硅粉进行改进，如形核功能、粒度、相含量、纯度、分散性能等。用户的需求是我们创新的来源，本公司愿同用户一起共同探讨氮化硅的性能对多晶硅铸锭过程的影响，为多晶硅企业提供力所能及的技术指导和试验支持。
氮化硅粉扫描电镜照片
SEM picture of Si3N4 powder
氮化硅粉典型粒度分布图
Typical Chart ofparticle size distribution of Si3N4 powder
典型参数 Typical specifications
产品型号 |
TX-Q |
TS |
TH-A |
Alpha phase(%) |
≥90 |
≥90 |
≥90 |
Fe(ppm) |
≤15 |
≤12 |
≤5 |
Al(ppm) |
≤10 |
≤8 |
≤4 |
Ca(ppm) |
≤10 |
≤6 |
≤3 |
O(%) |
≤1.6 |
≤1.6 |
≤1.6 |
N(%) |
≥38.5 |
≥38.5 |
≥38.5 |
Free Silicon(%) |
≤0.2 |
≤0.1 |
≤0.1 |
D50(μm) （MASTERSIZER 2000） |
≤2.5 |
≤2.5 |
≤2.5 |
D50(μm） （BECKMAN COULTER LS13320） |
≤1.5 |
≤1.5 |
≤1.5 |
Solar GradeSilicon Nitride Powder
Solar gradesilicon nitride powder, as release agent, is used to spray to thesurface of fused silica crucibles. It is the necessities for the production ofmulti-crystal ingots.
The solar gradesilicon nitride powder produced by Tomley is synthesized through specialnitridation process of silicon powder which ensures thepowder with the character of high purity, narrow particle size distribution，increasesthe success rate of ingot demoulding and with high yield of silicon ingot. The technical indicators of silicon nitride are closeto or have reached to the world advanced level, and the product quality hasbeen widely recognized by many well-known companies at home and abroad. Withthe improvement of purity and other technical specifications, the solargrade silicon nitride powder had a 60 percent market share in China or more.GCL, LDK, Jinko, JA, and Hareon solar are ourcustomers, and we can provide professional technical support.
Tomley attachesgreat importance to new product innovation and R & D work. Recently, thecompany has developed the upgraded silicon nitride powder (TX-Q) with the modelof TS by the innovation and the introduction of new equipment, and the ironcontent of TH-A can be achieved under 5 ppm.Under the impetus of the market, TS series products of Tomley have largequantities of supplies. In addition, product specificationsof solar grade silicon nitride powder can be adjusted with customers’ demandthrough the technological process, such as nucleation function, granularity,phase content, purity, dispersing property, etc. The customers’ demand is oursource of innovation, and Tomley is willing to work with customers to researchthe influence of the technical index of the silicon nitride during thepolycrystalline silicon ingot casting process, and provides technical guidanceand test support for polysilicon enterprises within our capabilities.