关键参数交互作用对煤基泡沫炭体积密度的影响

Influence of the interaction of key parameters on bulk density of carbon foam derived from coal

为了研究工艺参数交互作用对煤基泡沫炭体积密度的影响,以肥煤镜质组富集物为前驱体,采用高压渗氮法制备煤基泡沫炭。利用Design Expert V8.0.6软件对泡沫炭制备试验进行方案设计,据此研究捣固压力、发泡温度、发泡压力和发泡时间交互作用对泡沫炭体积密度的影响规律。结果表明:体积密度与各因素间的定量数学关系模型准确可靠。模型交互作用项对泡沫炭体积密度影响由高至低的显著性排列顺序为:发泡压力×发泡时间、捣固压力×发泡时间、发泡温度×发泡时间。另外,还得出令人欣慰的发现,即制备相同体积密度的泡沫炭可以有多种工艺参数组合,以最优实验方案中发泡温度和发泡压力较低的工艺组合制备泡沫炭,可以降低制备泡沫炭时的能耗及对设备抗压性的要求。

In order to optimize the preparation technology of carbon foam, carbon foams were prepared with vitrinite-concentration of fat coals as a precursor. The influence of interaction of key parameters on the bulk density of the carbon foam was investigated based on experimental schemes designed by the software of Design Expert V8.0.6. The key parameters include stamping pressure,foaming temperature, foaming pressure and foaming time. The bulk density and morphology of the carbon foams were tested by volume method and SEM, respectively. Results show that the obtained mathematical model of the bulk density and factors is accurate and reliable. The significance order of the interaction factor is foaming pressure and foaming time, stamping pressure and foaming time, and foaming temperature and foaming time from the high to low. Moreover, an exciting conclusion is drawn that carbon foam with a certain bulk density can be achieved by some experimental schemes. Furthermore, the selecting of the experimental scheme with the lower foaming temperature and pressure can reduce the energy consumption and pressure resistance to autoclave.