摘要
利用冷杉砂光木粉浸渍酚醛树脂制造木陶瓷预制件，在真空条件下碳化处理制备了多孔木陶瓷。采用差示扫描量热法（DSC）研究了木粉和酚醛树脂的热解特性，根据原料的热解特性制定了木陶瓷的碳化工艺，并讨论了碳化过程中升温速率和最高碳化温度对木陶瓷尺寸收缩、碳得率、尺寸稳定性、力学性能、耐磨性、电磁屏蔽性能和微观结构的影响。结果表明，木陶瓷碳化初始阶段（室温～120℃）快速升温至120℃，120℃以上升温速率为2～5℃／min时，木陶瓷的碳得率较高，尺寸稳定性较好；碳化温度在800℃时可以制得尺寸稳定的木陶瓷，但随着碳化温度的升高，木陶瓷的尺寸收缩增加不大，碳得率降低，抗压和抗弯强度增大，耐磨性和电磁屏蔽效能增大；烧结温度达到1400℃时，木陶瓷出现了石墨化倾向。
A kind of porous woodceramics was prepared by carbonizing sanding fir wood powder impregnated with phenolic resin （PF） in vacuum. The carbonization process parameters of woodceramics was determined by the investigatation of pyrolysis characteristics of wood powder and phenolic resin using differential scanning calorimetry（DSC） .The effects of the heating rate and carbonization temperature on dimension shrinkage, weight variation, dimension stability, mechanical properties, electromagnetic shielding property and microstructure of the woodceramics were discussed. The results show that the woodceramics has stability properties when carbonized at 800℃ with the heating rate 10℃/min from room temperature to 120℃ and 2 - 5℃/min above 120℃ . The results also indicate that the wear mass loss of the woodceramics decreases and the dimension stability increases with heating rate decreases, while compressive strength, bending strength, electromagnetic shielding property and wear mass loss of the woodceramics all increase with the carbonization temperature increases, but the increase of dimension shinkage is not obvious. According to the results of SEM observation, the woodceramics exhibits graphitization trend when carbonized at 1400℃.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第6期6-10,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(30500385)
霍英东教育基金(91027)
新世纪优秀人才支持计划(NCET)
关键词
砂光木粉
酚醛树脂
木陶瓷
碳化工艺
sanding wood power
phenolic resin
woodceramics
carbonization process
