推 荐 人:崔杰

文献信息1:Luo JT, Liu RP. Effect of Additives on the Sintering of Amorphous Nano-sized Silicon Nitride Powders[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed. 2009, 24(4):537-539.

推荐理由:本文通过液相烧结来获得纳米碳化硅粉末。用制得的粉末差异来比较聚丙烯酰胺凝胶法和沉淀法两类方法的差异。用聚丙烯酰胺法制备的添加剂粉末粒径小于20 nm,粒径分布尺寸十分狭窄且无粘结,但是密度略大,在1600烧结时烧结密度能达到98%。沉淀法制备的粉末粒径大于50 nm且粘结严重。本工作可以让我们在需要不同粒径产物的时候选择合适方法。

Abstract: Amorphous nano-sized silicon nitride powders were sintered by liquid phase sintering. The influences of the additives of Y2O3 and Al2O3 prepared by two different ways, the polyacrylamide gel method and the precipitation method, were investigated. The grain sizes of the additives prepared by the first method were finer than those of prepared by the latter method. When sintered at the same temperature, 1700, the average grain size of the silicon nitride is 0.3 µm for the sample with the former additives, which is much finer than the one with the latter additives. The density of additives prepared by precipitation method is clearly lower than those of prepared by polyacrylamide gel method.

下载地址:

http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD2009&filename=WLGY200904007&uid=WEEvREcwSlJHSldRa1Fhb09jMjVzQmVUUG5iNFZKQnJmWHpUcDl6UmcrTT0=$9A4hF_YAuvQ5obgVAqNKPCYcEjKensW4ggI8Fm4gTkoUKaID8j8gFw!!&v=MjcyMjl1ZHBGeS9sVTdySk1pSE1kN0c0SHRqTXE0OUZZNFI4ZVgxTHV4WVM3RGgxVDNxVHJXTTFGckNVUkwyZVo=

文献信息2:Luo JT, Zhang KF, Wang GF, et al. Fabrication of Fine-Grained Si3N4-Si2N2O Composites by Sintering Amorphous Nano-sized Silicon Nitride Powders [J]. Journal of Wuhan University of Technology-Mater.Sci.Ed. 2006, 21(3): 97-99.

推荐理由:作者用非晶态纳米氮化硅粉液相烧结来制备Si3N4-Si2N2O复合材料。通过实验可知:在反应中,相对密度、质量变化和平均粒径变化都与烧结温度成正比。Si3N4微粒被包埋进了Si2N2O中,从而使韧性增加到7.2 MPa· m 1/2,硬度增加到21.5GPa,实验中温度需严格控制在16001800之间。

Abstract: Si3N4-Si2N2O composites were fabricated with amorphous nano-sized silicon nitride powders by the liquid phase sintering (LPS).The Si2N2O phase was generated by an in-situ reaction 2Si3N4(s)+1.5O2 (g)=3Si2 N2 O(s)+N2(g).The content of Si2 N2O phase up to 60% in the volume was obtained at a sintering temperature of 1650 and reduced when the sintering temperature increased or decreased ,indicating the reaction is reversible. The mass loss, relative density and average grain size increased with increasing the sintering temperature. The average grain size was less than 500 nm when the sintering temperature was below 1700. The sintering procedure contains a complex crystallization and a phase transition: amorphous silicon nitride equiaxial α-Si3N4 equiaxial β-Si3N4 rod-like Si2N2O needle-like β-Si3N4. Small round-shaped β-Si3N4 particles were entrapped in the Si2N2O grains and a high density of staking faults was situated in the middle of Si2N2O grains at a sintering temperature of 1650. The toughness increased from 3.5 MPa· m 1/2 at 1600 to 7.2MPa·m1/2 at 1800. The hardness was as high as 21.5 GPa (Vickers) at 1600 .

下载地址:

http://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFD2006&filename=WLGY200603025&uid=WEEvREcwSlJHSldRa1Fhb09jMjVzQmVUUG5iNFZKQnJmWHpUcDl6UmcrTT0=$9A4hF_YAuvQ5obgVAqNKPCYcEjKensW4ggI8Fm4gTkoUKaID8j8gFw!!&v=MTczNzJUM3FUcldNMUZyQ1VSTDJlWnVkcEZ5L25VcnZKTWlITWQ3RzRIdGZNckk5SFlZUjhlWDFMdXhZUzdEaDE=



本网站由阿里云提供云计算及安全服务 Powered by CloudDream