烧结工艺对木材陶瓷孔隙结构的影响

Effects of sintering process on pore structure of woodceramics

以松木粉、液化木材和ZnCl_2为原料制备木材陶瓷,采用低温氮吸附法和扫描电镜(SEM)检测与评价烧结工艺对木材陶瓷孔隙结构的影响。SEM观测显示:木材陶瓷中多种孔隙结构并存,且木材的天然结构得以部分保存。低温氮吸附法检测表明:孔隙结构为H3型,以孔径为2.3~4.5 nm左右的介孔为主。烧结温度、升温速度和保温烧结时间等因素对孔隙结构有较大的影响。其比表面积随着烧结温度的升高而增加,但在高温区减小,而平均孔径则随烧结温度的升高表现为先减小后增加的趋势。1300℃、保温烧结30 min木材陶瓷的比表面积和平均孔径分别为364.2 m^2·g^(-1)和2.473 nm。

Woodceramics were prepared by sintering using pine wood powder, liquefied wood and ZnCl2as raw materials, and the effects of sintering parameters on pore structure of the woodceramics were studied by means of the low-temperature nitrogen adsorption method and scanning electron microscopy （ SEM）. The SEM observation shows that there are many kinds of pore structure in the woodceramics, and the natural structure of wood can be partly preserved. The results of low-temperature nitrogen adsorption method indicate that the pore structure is H3 type, and the pore size is about 2.3-4.5 nm. The sintering temperature, heating rate and sintering time have great influence on the pore structure. The specific surface area increases with the increasing of the sintering temperature, but decreases at higher temperature region. Meanwhile, the average pore diameter first decreases and then increases with the increasing of the sintering temperature. The specific surface area and pore size of the woodceramics sintered at 1300 ℃ for 30 min are 364. 2 m^2·g^-1 and 2.473 nm, respectively.