摘要
以木粉、正硅酸乙酯(TEOS)为原料,采用溶胶-凝胶方法将TEOS引入到木粉空隙中制备出木粉/TEOS杂化材料,在较低温度下烧结制得S iC木材陶瓷。采用热失重分析(TGA)、X射线衍射分析(XRD)、红外光谱(FT-IR)和扫描电镜(SEM)对其物相变化和显微结构进行了表征,用阿基米德法测定S iC木材陶瓷的显气孔率,研究了烧结温度和杂化材料增重率对S iC木材陶瓷摩擦性能的影响。研究结果表明,木粉/TEOS杂化材料在800℃时总的失重率仅为20%,是理想的S iC陶瓷前驱体;杂化材料中的S i-O-C结构可以在1000℃烧结成S iC;S iC木材陶瓷主晶相由-βS iC和S iO2组成,具有类似于木材的多孔拓扑结构;显气孔率随着烧结温度的升高先升后降,而随增重率的增加而增加;耐磨性能随烧结温度和增重率的增加而提高。
Wood/TEOS hybrid material was prepared by sol-gel method using TEOS and china fir powder as raw materials.SiC woodceramics were prepared from hybrid material through sintering at lower temperature.Thermogravimetric analysis,X-ray diffraction,Fourier transform infrared spectroscope and scanning electron microscopy were employed to characterize the phase transformation and structural changes during the conversion of hybrid material into SiC woodceramics.Apparent porosity were measured by Archimend＇s law,and the tribology performance was investigated as function of sintering temperature and weight percent gain of hybrid material.The results show that the weight loss gain of wood/TEOS hybrid material is 20% at 800 ℃,so it is an ideal medium of SiC ceramics.The Si-O-C structure of hybrid material can changed into SiC in reaction sintering at 1000 ℃.The resulting SiC ceramics is composed of major crystal phase β-SiC and SiO2 and has porous topology microstructure similar to wood.Apparent porosity is increased then reduced with the increase of sintering temperature and the decreasing in weight percent gain of hybrid material.The wearability of wood ceramics improved dramatically when weight percent gain and sintering temperature increased,especially for the sintering temperature between 1000 ℃and 1200 ℃.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第1期55-60,68,共7页
Bulletin of the Chinese Ceramic Society
基金
安徽省高等学校省级优秀青年人才基金(2009SQRZ032)
