摘要
利用碳热还原法制备了仿动物骨骼的哑铃形碳化硅晶须.晶须由直杆和附着其上的念球状小球组成，直杆的直径约为100nm～1μm，念珠状小球的直径约为200nm～10μm.制备的哑铃形碳化奔硅晶须的形貌具有相似性，但是在不同的晶须上念珠状小球的直径、分布和形状又有差异.EDS的分析结果表明念珠状小球中的主要成分是Si和O，另有少量的Na和Al，而直杆的主要成分是Si和C.XRD分析结果表明哑铃形碳化硅晶须的晶型是β-SiC，但其中还有SiO2和较弱的α-SiC的峰及非晶态峰出现．从EDS和XRD的分析结果可以推断碳化硅晶须中的直杆是SiC晶须，而念珠状小球是由SiO2晶体和非晶态的SiOx（1＜x＜2）物质及硅酸钠或硅酸铝等玻璃态物质组成的.哑铃形碳化硅晶须的生成过程是气相反应过程．
Dumbbell-shaped biomimetic silicon carbide whiskers were prepared by the method of solid Synthesis of SiO2 and C. The dumbbell-shaped whisker was composed of a rod (100nm～1um in diameter) and small beads (200urn～10um in diameter). The dumbbell-shaped whiskers have the similar morphology, but the shape and size of beads and distance between two beads are different for different whiskers. The main composition of beads analyzed by EDS is St and O with a small amount of Na and Al. and the main composition of rods is St, C respectively. The crystal of whiskers is identified as β-SiC by X ray diffraction method, and some small peaks of αa-SiC and SiO2 are also identified. There also existed an amorphous pattern. According to the results of EDS and XRD, it can be inferred that the rods are SiC whiskers and the beads on the rods are composed of SiOZ crystal and amorphous SiOx (1< x <2) with a small amount of soda-lime glass and alumo-silicate glass. The growth of dumbbell-shaped whiskers is gas--phase process.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1999年第3期239-243,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金!59431040
