碳陶瓷集热材料制备及其性能

以中药提取废渣为原材料通过预炭化、混合施加酚醛树脂和真空烧结等工序制备太阳能集热材料,通过SEM分析对比材料制备前后的微观结构,并以正交试验为基础,分析升温速率、预碳化温度、碳化温度、施胶量和保温时间等5个影响因素对材料碳得率及吸光率的影响,结果表明该材料最佳制备工艺条件为:升温速率3℃/min、预碳化温度350℃、碳化温度850℃、施胶量50%、保温时间150 min,在最佳条件下制备的集热材料有良好的吸光性能,吸光率可达87.2%,可用作光热转换材料.

Preparation and properties of heat-collection of carbon-ceramic

The residue of extracted traditional Chinese drugs was used to prepare material for solar energy collecting by pre-carbonizing,adding resin and carbonizing.We compared microstructure of material before and after preparation by SEM,and explored the influences of temperature raising rate,pre-carbonization temperature,carbonization temperature,resin content,holding time on carbon yield and absorptivity of the material based on orthogonal experiment.The results show that the optimal preparation conditions are resin of 50%,pre-carbonizing temperature of 350 ℃,carbonizing temperature of 850 ℃ at the rate of 3 ℃/min and holding for 150min.The prepared material has good absorbance property and its absorptivity is up to 87.2%,so it can be used as photothermal conversion material.